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Cohesive Zone Model in ANSYS

Hello Everyone,

I am trying to model a propagation of fluid-driven crack in ansys apdl and I have the following questions:

 I want to model a crack inside a very big plate and fluid is injecting to the center of crack and because of fluid flow the crack will start to grow here are some question that I have:
1- Can I do this in WorkBench (later I want to extend my solution to 3D and combine it with poroelastic elements)? I could not find any documentation about "Interface elements" in WorkBench? how accurate is it with respect to ANSYS APDL? also I guess it is not available in WB 14.5.
2- For my basic (2D) problem I am using the following elements, am I in the right track:
PLANE182, INTER202, FLUID141
3- Is there differences between giving fluid velocity and fluid flow? if there is, how it is possible to model fluid flow (source or injection rate)?
4- How is this possible to mesh an elliptical caurve in ANSYS APDL? I tried polar coordinate but it is not working.
5-each time after defining the physics of the problem should we clear it ("physics,clear")? what will happen if we do not do that? If we clear the physics then when I run the solver for FSI it does not have any material defined or element defined informations.
6-Should we use null elements in FSI? what will happen if we do not use them? because we use element attribute?
7- Do I need to glue the intersection in order to use CZM model? what is the difference between glue and merging?
8- when I run the problem I get the following error what should I do:
error unable attempting to backup unusable results file. check read/write permission file ansys.rfm

Comments

Hi, are you still working on it? I am facing the same issue.

Hi April, 

After working for a while, based on the limitation that we had for software and also in that version of ANSYS, it was not developed enough for my usage, I switched to ABAQUS. ABAQUS has pore-pressure cohessive elements which will do exactly what I wanted. I am not sure with recent version of ANSYS, but if you think you cannot find enough of it, I recommend you to go with ABAQUS, because it is well documented and developed for such a problem. I checked for COMSOL, and it could not do that work at that time either.

Cheers, 

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