iMechanica - Comments for "Subroutine simulation migration from HETVAL to UMATH"
https://imechanica.org/node/12772
Comments for "Subroutine simulation migration from HETVAL to UMATH"enHi Frank!
https://imechanica.org/comment/19359#comment-19359
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<p><em>In reply to <a href="https://imechanica.org/comment/19351#comment-19351">establish contact</a></em></p>
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Hi!
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The problem is related with an overdefinition of the FLUX variable, that part is unclear.
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Unfortunatelly the files are with her, so I'll have to wait until monday to get them.
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Thanks for the help!
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Paulo
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</ul>Fri, 20 Jul 2012 14:03:00 +0000PauloCalvocomment 19359 at https://imechanica.orgThanks, but...
https://imechanica.org/comment/19358#comment-19358
<a id="comment-19358"></a>
<p><em>In reply to <a href="https://imechanica.org/comment/19347#comment-19347">Heat generation / absorption in Abaqus UMATHT</a></em></p>
<div class="field field-name-comment-body field-type-text-long field-label-hidden"><div class="field-items"><div class="field-item even"><p>Actually the problem is that I'd like to use a material property subroutine that depends in the heat transfer and not in heat generation, the subroutine works just fine with heat flux input but it doesn't in heat flux ouptut, therefore the need of another subroutine independent of heat generation like UMATHT.</p>
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</ul>Fri, 20 Jul 2012 13:54:01 +0000PauloCalvocomment 19358 at https://imechanica.orgestablish contact
https://imechanica.org/comment/19351#comment-19351
<a id="comment-19351"></a>
<p><em>In reply to <a href="https://imechanica.org/node/12772">Subroutine simulation migration from HETVAL to UMATH</a></em></p>
<div class="field field-name-comment-body field-type-text-long field-label-hidden"><div class="field-items"><div class="field-item even"><p>
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Hello Paulo,</p>
<p>Steffie the Snake did not act according to her instructions.</p>
<p>What does Abaqus report in case of " and some times even no compilation of the .for file." ?</p>
<p>Did you modify the model ?</p>
<p>Send me<br />
Input file together with HETVAL and other subroutines if need be<br />
Input file together with UMATHT and other subroutines if need be<br />
target data from measurement<br />
ALL PERTAINING TO THE SAME TEST</p>
<p>Keep in mind: you may also post on<br /><a href="http://tech.groups.yahoo.com/group/Abaqus/">http://tech.groups.yahoo.com/group/Abaqus/</a><br />
if we all fail.</p>
<p>Perhaps the Snake is at least willing to leak my E-mail-adress to you.</p>
<p>Frank
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<p>
------------------------------------------<br />
Ruhr-University<br />
Bochum<br />
Germany
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</ul>Wed, 18 Jul 2012 19:42:21 +0000Frank Richtercomment 19351 at https://imechanica.orgHeat generation / absorption in Abaqus UMATHT
https://imechanica.org/comment/19347#comment-19347
<a id="comment-19347"></a>
<p><em>In reply to <a href="https://imechanica.org/node/12772">Subroutine simulation migration from HETVAL to UMATH</a></em></p>
<div class="field field-name-comment-body field-type-text-long field-label-hidden"><div class="field-items"><div class="field-item even"><p>
I don't know of any other sample UMATHT subroutines, but I believe you can introduce volumetric heat generation or absorption in UMATHT via the definition of the internal energy per unit mass, which is u. To include volumetric terms, the proper definition for u is:
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u = u + du - q''' delta_t / rho
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Note that q''' denotes a volumetric **generation** term (with units of power / volume). The negative sign in front of q''' was a bit non-intuitive to me at first, but it is in fact correct and is due to the definition of the Jacobian for Newton's Method (more details are shown in the Abaqus Documentation for UMATHT). I verified this definition of u for cases with heat generation, and while I don't recall doing so for heat absorption, I don't see why it would change. Hope this helps and good luck.
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</ul>Wed, 18 Jul 2012 17:25:25 +0000John Podhinycomment 19347 at https://imechanica.orgError | iMechanica