iMechanica - porous media
https://imechanica.org/taxonomy/term/2508
enComputational Geomechanics mini-symposium at EMI 2020 New York
https://imechanica.org/node/23813
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/48">conferences</a></div><div class="field-item odd"><a href="/taxonomy/term/12703">EMI2020</a></div><div class="field-item even"><a href="/taxonomy/term/944">geomechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/169">Plasticity</a></div><div class="field-item even"><a href="/taxonomy/term/743">granular mechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/4460">Constitutive model</a></div><div class="field-item even"><a href="/taxonomy/term/2508">porous media</a></div><div class="field-item odd"><a href="/taxonomy/term/12333">rock fracture</a></div><div class="field-item even"><a href="/taxonomy/term/2605">Multiphysics</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span>Dear Colleagues,</span></p>
<p><span>We would like to cordially invite you to the <strong>Computational Geomechanics mini-symposium at the <a href="https://www.emi-conference.org/">ASCE EMI 2020 Conference</a></strong>, which will take place on <strong>May 26–29, 2020 at Columbia University in NYC.</strong> </span><strong>The abstract submission is now open<span> until January 15, 2020 </span></strong>(Link: <a href="https://submissions.emi2020.org/">https://submissions.emi2020.org</a>)<span>. The mini-symposium description is given below:</span></p>
<p><strong><span>MS 206: </span>Computational Geomechanics – in Honor of the 90th Birthday of Professor Frank L. DiMaggio</strong></p>
<p><strong><span>Organizers</span></strong></p>
<p><span>Jinhyun Choo, The University of Hong Kong (Contact Organizer)</span><br /><span>Jose Andrade, California Institute of Technology</span><br /><span>Ronaldo Borja, Stanford University</span><br /><span>Qiushi Chen, Clemson University</span><br /><span>Hoe Ling, Columbia University</span><br /><span>Majid Manzari, George Washington University</span><br /><span>SeonHong Na, McMaster University</span><br /><span>Richard Regueiro, University of Colorado Boulder</span><br /><span>WaiChing Sun, Columbia University</span></p>
<p><strong><span>Abstract</span></strong></p>
<p>This mini-symposium will provide a forum for presentation and discussion of the state-of-the-art in computational geomechanics. Emphasis will be on novel formulations, computational methods, and numerical simulations involving geomaterials such as soil and rock. Contributions are solicited in, but not restricted to, the following topic areas in computational geomechanics: (1) development, implementation, and validation of advanced constitutive models, (2) computational models and algorithms for multiphysics problems (coupled fluid flow and solid deformation, chemo-thermo-hydro-mechanics, etc.), (3) numerical modeling of fracture, damage, and fragmentation processes in geomaterials, (4) micromechanics (particulate mechanics, molecular dynamics, etc.), (5) multiscale modeling (hierarchical and concurrent schemes, etc.), (6) meshfree methods for large deformation problems, (7) nonlocal and/or generalized continuum modeling, (8) dynamics of geomaterials, and (9) uncertainty quantification and probabilistic methods.</p>
<p>This mini-symposium honors Professor Frank L. DiMaggio who has made immense contributions to many fields of engineering mechanics including computational geomechanics.</p>
<p>Thank you for your consideration, and I hope to see many of you at EMI 2020!</p>
<p>Best regards,<br />Jinhyun</p>
</div></div></div>Sat, 07 Dec 2019 03:03:52 +0000Jinhyun Choo23813 at https://imechanica.orghttps://imechanica.org/node/23813#commentshttps://imechanica.org/crss/node/23813The behaviour of drainage fronts in porous systems
https://imechanica.org/node/23680
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/12647">Drainage</a></div><div class="field-item odd"><a href="/taxonomy/term/2508">porous media</a></div><div class="field-item even"><a href="/taxonomy/term/2317">Soil</a></div><div class="field-item odd"><a href="/taxonomy/term/23">fluid mechanics</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><a href="https://link.springer.com/article/10.1007/s11242-018-1113-3">Dynamics of Viscous Entrapped Saturated Zones in Partially Wetted Porous Media</a>
</p><p> </p>
<p><a href="https://arxiv.org/abs/1802.07387">Available also here</a></p>
<p> </p>
<p>Abstract<br /></p><p id="Par1" class="Para">As a typical multiphase fluid flow process, drainage in porous media is of fundamental interest both in nature and in industrial applications. During drainage processes in unsaturated soils and porous media in general, saturated regions, or clusters, in which a liquid phase fully occupies the pore space between solid grains, affect the relative permeability and effective stress of the system. Here, we experimentally study drainage processes in unsaturated granular media as a model porous system. The distribution of saturated clusters is analysed by optical imaging under different drainage conditions, with pore-scale information from Voronoi and Delaunay tessellation used to characterise the topology of saturated cluster distributions. By employing statistical analyses, we describe the observed spatial and temporal evolution of multiphase flow and fluid entrapment in granular media. Results indicate that the distributions of both the crystallised cell size and pore size are positively correlated to the spatial and temporal distribution of saturated cluster sizes. The saturated cluster size is found to follow a lognormal distribution, in which the generalised Bond number (<span id="IEq1" class="InlineEquation"><span id="MathJax-Element-1-Frame" class="MathJax" tabindex="0" data-mathml="//www.w3.org/1998/Math/MathML"><mi>B</mi><msup><mi>o</mi><mrow class="MJX-TeXAtom-ORD"><mo>&#x2217;</mo></mrow></msup></math>"><span id="MathJax-Span-1" class="math"><span><span><span id="MathJax-Span-2" class="mrow"><span id="MathJax-Span-3" class="mi">B</span><span id="MathJax-Span-4" class="msubsup"><span><span><span id="MathJax-Span-5" class="mi">o</span></span><span><span id="MathJax-Span-6" class="texatom"><span id="MathJax-Span-7" class="mrow"><span id="MathJax-Span-8" class="mo">∗</span></span></span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML">Bo∗</span></span></span>) correlates negatively to the scale parameter (<em class="EmphasisTypeItalic ">μ</em>) and positively to the shape parameter (<em class="EmphasisTypeItalic ">σ</em>). With further consideration of the total surface energy obtained based on liquid–air interfaces, we were able to include additional grain-scale information in the constitutive modelling of unsaturated soils using both the degree of saturation and generalised Bond number. These findings can be used to connect pore-scale behaviour with overall hydro-mechanical characteristics in granular systems.</p>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/Li2018_Article_DynamicsOfViscousEntrappedSatu.pdf" type="application/pdf; length=3970351">Li2018_Article_DynamicsOfViscousEntrappedSatu.pdf</a></span></td><td>3.79 MB</td> </tr>
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</div></div></div>Sun, 13 Oct 2019 18:19:52 +0000Dr. Hanaor - Department of Ceramic Materials - TU Berlin23680 at https://imechanica.orghttps://imechanica.org/node/23680#commentshttps://imechanica.org/crss/node/23680Tailoring porous media for controllable capillary flow
https://imechanica.org/node/22967
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/12348">capillary flow</a></div><div class="field-item odd"><a href="/taxonomy/term/2508">porous media</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Liu, M., Suo, S., Wu, J., Gan, Y., Hanaor, D. A. H., & Chen, C. Q. <strong><em>Journal of Colloid and Interface Science</em></strong>, 2019, <strong>539</strong>: 379-387. <a href="https://www.sciencedirect.com/science/article/pii/S0021979718315108#f0040">https://www.sciencedirect.com/science/article/pii/S0021979718315108#f0040</a></p>
<p><img src="https://ars.els-cdn.com/content/image/1-s2.0-S0021979718315108-ga1_lrg.jpg" width="400" height="209" /></p>
<p><em><strong>Hypothesis</strong></em></p>
<p>Control of capillary flow through porous media has broad practical implications. However, achieving accurate and reliable control of such processes by tuning the pore size or by modification of interface wettability remains challenging. Here we propose that the liquid flow by capillary penetration can be accurately adjusted by tuning the geometry of porous media.</p>
<p><em><strong>Methodologies</strong></em></p>
<p>On the basis of Darcy’s law, a general framework is proposed to facilitate the control of capillary flow in porous systems by tailoring the geometric shape of porous structures. A numerical simulation approach based on finite element method is also employed to validate the theoretical prediction.</p>
<p><em><strong>Findings</strong></em></p>
<p>A basic capillary component with a tunable velocity gradient is designed according to the proposed framework. By using the basic component, two functional capillary elements, namely, (i) flow accelerator and (ii) flow resistor, are demonstrated. Then, multi-functional fluidic devices with controllable capillary flow are realized by assembling the designed capillary elements. All the theoretical designs are validated by numerical simulations. Finally, it is shown that the proposed concept can be extended to three-dimensional design of porous media.</p>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/JCIS-2019-Tailoring%20porous%20media%20for%20controllable%20capillary%20flow_0.pdf" type="application/pdf; length=1514450" title="JCIS-2019-Tailoring porous media for controllable capillary flow.pdf">JCIS-2019-Tailoring porous media for controllable capillary flow.pdf</a></span></td><td>1.44 MB</td> </tr>
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</div></div></div>Fri, 28 Dec 2018 06:10:35 +0000Mingchao Liu22967 at https://imechanica.orghttps://imechanica.org/node/22967#commentshttps://imechanica.org/crss/node/22967Computational Geomechanics mini-symposium at EMI 2019 Caltech
https://imechanica.org/node/22927
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/48">conferences</a></div><div class="field-item odd"><a href="/taxonomy/term/12332">EMI 2019</a></div><div class="field-item even"><a href="/taxonomy/term/944">geomechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/169">Plasticity</a></div><div class="field-item even"><a href="/taxonomy/term/4821">poromechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/743">granular mechanics</a></div><div class="field-item even"><a href="/taxonomy/term/1092">constitutive modeling</a></div><div class="field-item odd"><a href="/taxonomy/term/2508">porous media</a></div><div class="field-item even"><a href="/taxonomy/term/12333">rock fracture</a></div><div class="field-item odd"><a href="/taxonomy/term/2605">Multiphysics</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Dear Colleagues,</p>
<p> </p>
<p>We would like to cordially invite you to the <strong>Computational Geomechanics mini-symposium in EMI 2019</strong>, which will be held on <strong>June 18–21, 2019 at Caltech, Pasadena, CA, USA.</strong> The abstract submission is now open at <a href="emi2019.exordo.com">emi2019.exordo.com</a> <strong>until January 30, 2019</strong>. The mini-symposium description is given below:</p>
<p> </p>
<p><strong>EMI 2019, June 18–21, 2019. Caltech, Pasadena, CA, USA.</strong></p>
<p>(Joint conference with Geo-Institute)</p>
<p> </p>
<p><strong>MS35: Computational Geomechanics</strong></p>
<p> </p>
<p><strong>Organizers</strong></p>
<p>Jinhyun Choo, The University of Hong Kong (Contact Organizer)</p>
<p>Jose Andrade, California Institute of Technology</p>
<p>Ronaldo Borja, Stanford University</p>
<p>Qiushi Chen, Clemson University</p>
<p>Majid Manzari, George Washington University</p>
<p>SeonHong Na, McMaster University</p>
<p>Richard Regueiro, University of Colorado Boulder</p>
<p>WaiChing Sun, Columbia University</p>
<p> </p>
<p><strong>Description</strong></p>
<p>This mini-symposium will provide a forum for presentation and discussion of the state-of-the-art in computational geomechanics. Emphasis will be on novel formulations, computational methods, and numerical simulations involving geomaterials such as soil and rock. Contributions are solicited in, but not restricted to, the following topic areas in computational geomechanics: (1) development, implementation, and validation of advanced constitutive models, (2) computational models and algorithms for multiphysics problems (coupled multiphase flow and solid deformation, chemo-thermo-hydro-mechanics, etc.), (3) numerical modeling of fracture, damage, and fragmentation processes in geomaterials, (4) micromechanics (particulate mechanics, molecular dynamics, etc.), (5) multiscale modeling (hierarchical and concurrent schemes, etc.), (6) meshfree methods for large deformation problems, (7) nonlocal and/or generalized continuum modeling, (8) dynamics of geomaterials, and (9) uncertainty quantification and probabilistic methods.</p>
<p> </p>
<p>Best regards, </p>
<p>Jinhyun Choo</p>
</div></div></div>Thu, 13 Dec 2018 10:29:15 +0000Jinhyun Choo22927 at https://imechanica.orghttps://imechanica.org/node/22927#commentshttps://imechanica.org/crss/node/22927PhD and Postdoc Positions in computational poromechanics at Columbia University
https://imechanica.org/node/22651
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/73">job</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/944">geomechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/2508">porous media</a></div><div class="field-item even"><a href="/taxonomy/term/162">computational mechanics</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>I am seeking a Ph.D. student and/or postdoc associate for a number of projects related to high-strain-rate plasticity and phase-transition of porous media. </p>
<p>Candidates with demonstrated experience in computational mechanics, poromechanics, and implementation of codes in C++ and python are strongly preferred. Basic understanding of tensor calculus and continuum mechanics is required for the Ph.D. position. Students with track-records of academic achievements are encouraged to apply. </p>
<p>Applications will be accepted until the position is filled. The selected candidate will receive financial support for stipend, full tuition, and benefits. Please send (1) a brief cover letter, (2) a CV, (3) contact information of at least 2 references, (4) a copy of recent publications (if applicable) or other supporting documents to wsun at columbia.edu. </p>
<p>More information can be found at our research group webpage <a href="https://poromechanics.weebly.com">http://poromechanics.weebly.com/ </a>and <a href="https://poromechanics.weebly.com/recruitment.html">https://poromechanics.weebly.com/recruitment.html</a></p>
<p>We expect the new postdoc will start in January 2019 and the PhD student will enroll in Fall 2019. </p>
</div></div></div>Sun, 16 Sep 2018 11:48:07 +0000WaiChing Sun22651 at https://imechanica.orghttps://imechanica.org/node/22651#commentshttps://imechanica.org/crss/node/22651Tuning capillary penetration in porous media: Combining geometrical and evaporation effects
https://imechanica.org/node/22250
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2508">porous media</a></div><div class="field-item odd"><a href="/taxonomy/term/12020">capillary penetration</a></div><div class="field-item even"><a href="/taxonomy/term/2099">Geometry</a></div><div class="field-item odd"><a href="/taxonomy/term/8270">evaporation</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span>Liu, M., Wu, J., Gan, Y., Hanaor, D. A., & Chen, C. Q. (2018). <a href="https://doi.org/10.1016/j.ijheatmasstransfer.2018.02.101">Tuning capillary penetration in porous media: Combining geometrical and evaporation effects.</a> International Journal of Heat and Mass Transfer, 123, 239-250.</span></p>
<p><img src="https://ars.els-cdn.com/content/image/1-s2.0-S0017931017344563-fx1_lrg.jpg" width="400" height="226" /></p>
<p><em><strong>Abstract</strong></em>: Capillary penetration of liquids in porous media is of great importance in many applications and the ability to tune such penetration processes is increasingly sought after. In general, liquid penetration can be retarded or restricted by the evaporation of volatile liquid at the surface of the porous media. Moreover, when capillary penetration occurs in a porous layer with non-uniform cross section, the penetration process can be accelerated or impeded by adjusting the section geometry. In this work, on the basis of Darcy’s Law and mass conservation, a theoretical model of capillary penetration combining evaporation effects in two-dimensional homogeneous porous media of varying cross-section is developed and further examined by numerical simulations. The effects of sample geometry and liquid evaporation on capillary penetration are quantitatively analyzed. Results show that the penetration velocity is sensitive to the geometry of the porous layer, and can be tuned by varying the evaporation rate for a given geometry. Under given evaporation conditions, penetration is restricted to a limited region with a predictable boundary. Furthermore, we find that the inhibition of liquid penetration by evaporation can be offset by varying the geometry of the porous layer. The theoretical model is further extended to model the capillary flow in three-dimensional porous media. The interplay of geometry and evaporation during the capillary flow process in 3D conditions is also investigated. The results obtained can be used to facilitate the design of porous structures to achieve tunable capillary penetration for practical applications in various fields.</p>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/IJHMT-2018-Tuning%20capillary%20penetration%20in%20porous%20media_Combining%20geometrical%20and%20evaporation%20effects.pdf" type="application/pdf; length=1173058">IJHMT-2018-Tuning capillary penetration in porous media_Combining geometrical and evaporation effects.pdf</a></span></td><td>1.12 MB</td> </tr>
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</div></div></div>Tue, 20 Mar 2018 07:08:21 +0000Mingchao Liu22250 at https://imechanica.orghttps://imechanica.org/node/22250#commentshttps://imechanica.org/crss/node/22250Simpleware at InterPore 2017, Sep 4-5
https://imechanica.org/node/21508
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/74">conference</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/6746">simpleware</a></div><div class="field-item odd"><a href="/taxonomy/term/11745">interpore</a></div><div class="field-item even"><a href="/taxonomy/term/2508">porous media</a></div><div class="field-item odd"><a href="/taxonomy/term/350">simulation</a></div><div class="field-item even"><a href="/taxonomy/term/11548">2017</a></div><div class="field-item odd"><a href="/taxonomy/term/48">conferences</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><strong><img src="https://www.simpleware.com/img/logos/Interpore.png" alt="Simpleware at InterPore 2017" width="250" height="106" /></strong></p>
<p><strong>September 4 - 5, 2017 - University of Warwick, Coventry, UK</strong></p>
<p>The major aim of UK InterPore Conference is to bring together specialists from academia and industry working in areas related to porous media. This is the third annual conference of the UK chapter of the International Society for Porous Media (InterPore). It aims to advance and disseminate the knowledge for the understanding, description, and modeling of natural and industrial porous media systems.</p>
<p><strong>Simpleware at UK InterPore 2017</strong></p>
<ul><li>At the conference you can learn about our software’s strengths for material sciences and porous media:</li>
<li>Easily segmenting and analysing different particles with watershed-based tools</li>
<li>Quantifying porosity, cracks, grain orientations and other statistics</li>
<li>Generating multiphase meshes for direct export into leading FE and CFD solvers</li>
<li>Adding mesh information for FEA and CFD (contacts, node sets, shells, inlets/outlets, boundary layers...)</li>
<li>Calculating effective material properties: elastostatic properties, permeability, conductivity...</li>
</ul><p><strong>Attend the Simpleware Workshop</strong></p>
<p><strong>Title: Introduction to 3D Image Visualisation, Analysis and Model Generation with Simpleware </strong></p>
<p><strong>Date/Time: Monday, September 4, 2017 / 2:00 - 3:30 pm </strong></p>
<p><strong>Presenter: Celia Butler (PhD)</strong></p>
<p>We will also be happy to meet with you and discuss your visualisation, analysis and mesh generation needs. If you wish to arrange a demo during the Conference, or can't attend but have questions about Simpleware, please feel free to contact us at <a href="mailto:simpleware@synopsys.com">simpleware@synopsys.com</a>.</p>
<p>You can also learn more about this event here: <a href="http://www2.warwick.ac.uk/fac/sci/eng/intranet/events/ukipcpm">http://www2.warwick.ac.uk/fac/sci/eng/intranet/events/ukipcpm</a></p>
<p> </p>
</div></div></div>Tue, 15 Aug 2017 09:38:26 +0000Simpleware21508 at https://imechanica.orghttps://imechanica.org/node/21508#commentshttps://imechanica.org/crss/node/21508Evaporation limited radial capillary penetration in porous media
https://imechanica.org/node/20371
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2508">porous media</a></div><div class="field-item odd"><a href="/taxonomy/term/12020">capillary penetration</a></div><div class="field-item even"><a href="/taxonomy/term/8270">evaporation</a></div><div class="field-item odd"><a href="/taxonomy/term/721">phase diagram</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Liu, M., Wu, J., Gan, Y., Hanaor, D. A., & Chen, C. Q. (2016). <a href="http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.6b02404">Evaporation limited radial capillary penetration in porous media.</a> Langmuir, 32(38), 9899-9904.</p>
<p><img src="https://pubs.acs.org/cms/10.1021/acs.langmuir.6b02404/asset/images/medium/la-2016-02404n_0007.gif" width="400" height="214" /></p>
<p><em><strong>Abstract</strong></em>: The capillary penetration of fluids in thin porous layers is of fundamental interest in nature and various industrial applications. When capillary flows occur in porous media, the extent of penetration is known to increase with the square root of time following the Lucas-Washburn law. In practice, volatile liquid evaporates at the surface of porous media, which restricts penetration to a limited region. In this work, on the basis of Darcy’s law and mass conservation, a general theoretical model is developed for the evaporation-limited radial capillary penetration in porous media. The presented model predicts that evaporation decreases the rate of fluid penetration and limits it to a critical radius. Furthermore, we construct a unified phase diagram that describes the limited penetration in an annular porous medium, in which the boundaries of outward and inward liquid are predicted quantitatively. It is expected that the proposed theoretical model will advance the understanding of penetration dynamics in porous media and facilitate the design of engineered porous architectures.</p>
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</div></div></div>Wed, 28 Sep 2016 03:17:55 +0000Mingchao Liu20371 at https://imechanica.orghttps://imechanica.org/node/20371#commentshttps://imechanica.org/crss/node/20371A micromechanical analysis of the fracture properties of saturated porous media
https://imechanica.org/node/18063
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2508">porous media</a></div><div class="field-item odd"><a href="/taxonomy/term/31">fracture</a></div><div class="field-item even"><a href="/taxonomy/term/6034">Micromechanical modeling</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Liu, M., & Chen, C. (2015). <a href="https://doi.org/10.1016/j.ijsolstr.2015.02.031">A micromechanical analysis of the fracture properties of saturated porous media.</a> International Journal of Solids and Structures, 63, 32-38.</p>
<p><img src="https://ars.els-cdn.com/content/image/1-s2.0-S0020768315000773-gr1.jpg" alt="" width="357" height="194" /> <img src="https://ars.els-cdn.com/content/image/1-s2.0-S0020768315000773-gr4.jpg" alt="" width="252" height="190" /></p>
<p><strong><em>Abstract</em></strong>: A two-dimensional single edge crack problem is employed to investigate the fracture behavior of saturated poroelastic media. The media are mimicked by a micromechanical model consisting of elastic matrix and square arrays of voids with prescribed uniform pore pressure. Finite element method is used to simulate the fracture responses of the model subject to remote stress and pore pressure loading. The stress extrapolation method is extended for the porous media to calculate the nominal stress intensity factor (SIF) from the crack tip stress field. By adopting the tensile strength criterion and assuming either brittle or ductile failure of the constituent solid skeleton of the porous media, lower and upper bounds of the fracture toughness are obtained. Theoretical expressions for the stress intensity factor and the toughness are derived, agreeing well with numerical results. The effects of the arrangement of pores and the non-uniform pore pressure on the cracking of porous media are discussed and are found to only have moderate effects on the obtained results.</p>
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</div></div></div>Tue, 17 Mar 2015 00:49:45 +0000Mingchao Liu18063 at https://imechanica.orghttps://imechanica.org/node/18063#commentshttps://imechanica.org/crss/node/18063Call for Abstracts: EMII 2015 Stanford -Symposium on "Multiscale Digital Rock and Granular Physics"
https://imechanica.org/node/17243
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/10114">digital rock physics</a></div><div class="field-item odd"><a href="/taxonomy/term/10115">CT tomography</a></div><div class="field-item even"><a href="/taxonomy/term/944">geomechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/7457">rock mechanics</a></div><div class="field-item even"><a href="/taxonomy/term/2508">porous media</a></div><div class="field-item odd"><a href="/taxonomy/term/10116">poromehcanics</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Dear colleagues, </p>
<p>We cordinally invite you to submit abstracts for our symposium on Multiscale Digitial Rock and Granular Physics in the upcoming EMI conference (June 16-19, 2015) at Stanford University. The scope of the conference is listed below. The due date for the abstract submission is 11/15/2014. Further details can be found at <a href="http://www.emi2015.info/">http://www.emi2015.info/</a></p>
<p>Best Regards,</p>
<p><span>WaiChing Sun, Columbia University, USA</span><br /><span>Teng-fong Wong, The Chinese University of Hong Kong, Hong Kong </span><br /><span>Mario Martinez, Sandia National Laboratories, USA </span><br /><span>Xiaoyu Song, University of Florida, USA</span></p>
<p><span>----------------------------------------------------------------------------------------</span></p>
<p> </p>
<p><strong>MS 83: Multiscale Digital Rock and Granular Physics <br /></strong><br /><span>WaiChing Sun*, Columbia University, USA</span><br /><span>Teng-fong Wong, The Chinese University of Hong Kong, Hong Kong </span><br /><span>Mario Martinez, Sandia National Laboratories, USA </span><br /><span>Xiaoyu Song, University of Florida, USA</span></p>
<p><span>The mechanical, hydraulic and thermal properties of unsaturated geomaterials are strongly influenced by the micro-mechanical liquid-gas-solid interactions occurring in the pore space. As a result, understanding how microstructural attributes evolve is the key step to characterizing macroscopic responses of geomaterials. This MS is aimed at providing a forum for both modelers and experimentalists to exchange ideas on digital rock physics – a technique that infers or estimates macroscopic material responses directly from pore structures inferred from digital images. In particular, we seek contributions on innovative usage of micro-CT imaging techniques for geomaterials, applications of 3D printing techniques to study single- and dual-porosity systems, and analytical and numerical techniques that predict fluid-induced micromechanical responses of porous media, and the multiscale homogenization techniques that connects microstructural attributes to field-scale simulations. </span></p>
</div></div></div>Sat, 27 Sep 2014 15:00:27 +0000WaiChing Sun17243 at https://imechanica.orghttps://imechanica.org/node/17243#commentshttps://imechanica.org/crss/node/17243Computational Geomechanics Mini-symposium in17th USNCTAM 2014 at Michigan State University, East Lansing, Michigan.
https://imechanica.org/node/15626
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/74">conference</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/169">Plasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/944">geomechanics</a></div><div class="field-item even"><a href="/taxonomy/term/2508">porous media</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Dear Colleagues, </p>
<p>We would like to invite you to submit abstracts for the Computational Geomechanics mini-symposium in the 17th US National Congress on Theoretical and Applied Mechanics, to be held at Michigan State University from June 15-20th, 2014. The scope of the symposium is listed in the URL below. </p>
<p><a href="http://www.usnctam2014.org/minisymposium/computational-geomechanics">http://www.usnctam2014.org/minisymposium/computational-geomechanics</a></p>
<p>Deadline for abstract submission is on 1/6/2014. </p>
<p> </p>
<p>Best Regards,</p>
<p> </p>
<p>WaiChing</p>
<p> <br />
</p>
<p>Computational Geomechanics</p>
<p>Geomaterials, such as soil, rock and concrete, are multiphase porous materials whose macroscopic mechanical behaviors are governed by grain size distribution and mineralogy, fluid-saturation, pore space, temperature, loading paths and rate, drainage conditions, chemical reactions, and other factors. As a result, predicting the mechanical responses of geomaterials often require knowledge on how several processes, which often take place in different spatial and temporal domains, interact with each other across length scales.</p>
<p></p>
<p>This mini-symposium is intended to provide a forum for researchers to present contributions on recent advances in computational geomechanics problems. Topics within the scope of interests includes: development and validation of constitutive models that addressed coupling effects, discrete and continuum formulations for hydromechanics and thermo-hydro-mechanics problems, iterative sequential couplings of fluid and solid solvers, spatial variability of soil properties, multiscale mechanics, weak and strong discontinuities, and regularization techniques to circumvent pathological mesh dependence.</p>
</div></div></div>Mon, 11 Nov 2013 22:52:01 +0000WaiChing Sun15626 at https://imechanica.orghttps://imechanica.org/node/15626#commentshttps://imechanica.org/crss/node/15626Multiphysics Capabilities of ADINA
https://imechanica.org/node/8444
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/152">piezoelectric</a></div><div class="field-item odd"><a href="/taxonomy/term/2508">porous media</a></div><div class="field-item even"><a href="/taxonomy/term/3820">Fluid Structure Interaction</a></div><div class="field-item odd"><a href="/taxonomy/term/4046">thermo-mechanical coupling</a></div><div class="field-item even"><a href="/taxonomy/term/5332">Joule heating</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>ADINA offers a comprehensive array of multiphysics capabilities tightly integrated in one program:</p>
<p>
* Fluid-structure interaction (FSI)<br />
* Thermo-mechanical coupling (TMC)<br />
* Structural-pore pressure coupling (porous media)<br />
* Thermal-fluid-structural coupling<br />
* Electric field-structural coupling (piezoelectric)<br />
* Thermal-electrical coupling (Joule heating)<br />
* Acoustic fluid-structural coupling<br />
* Fluid flow-mass transfer coupling
</p>
<p>
The multiphysics capabilities of ADINA are unique both in their<br />
breadth and depth. Using these capabilities, not only a wide range of<br />
interactions between different physical fields can be considered, but<br />
each of these fields is treated in a general form without compromise on<br />
accuracy.
</p>
<p>
For more information please visit: <a href="http://www.adina.com/multiphysics.shtml">http://www.adina.com/multiphysics.shtml</a>
</p>
</div></div></div>Wed, 23 Jun 2010 14:11:43 +0000ADINA Support8444 at https://imechanica.orghttps://imechanica.org/node/8444#commentshttps://imechanica.org/crss/node/8444geomechanics
https://imechanica.org/node/3378
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Research activities on soil models, porous media, poroelasticity.</p>
</div></div></div><div class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above"><div class="field-label">Forums: </div><div class="field-items"><div class="field-item even"><a href="/forum/109">Ask iMechanica</a></div></div></div><div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-above"><div class="field-label">Free Tags: </div><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/708">poroelasticity</a></div><div class="field-item odd"><a href="/taxonomy/term/2507">soil models</a></div><div class="field-item even"><a href="/taxonomy/term/2508">porous media</a></div></div></div>Mon, 23 Jun 2008 04:25:46 +0000Donald X. Chen3378 at https://imechanica.orghttps://imechanica.org/node/3378#commentshttps://imechanica.org/crss/node/3378Error | iMechanica