I am trying to perform a cel (coupled eulerian and lagrangian) simulation in abaqus. as you can guess, i am having a trouble at boundaries of structure and eulerian material. Thus, I need to assign adaptive remeshing on eulerian domain so that penetration issues on the boundaries are minimized. i have abq 6.14.
Thanks for your time and help.
Hi,
I am not sure whether the Eulerian domain in CEL can be addressed with adaptive remeshing. However, CEL has been originally developed to avoid excessive remeshing in the Lagrangian mesh because a Eulerian mesh is fixed in space (no deformation).
So why do you need adaptive remeshing? Assign the Eulerian mesh to the material domain expecting the largest deformation and/or reduce your time step size.
Hope this answers your question.
Regards
Hi Daniel, Thanks for your answer. I actually want to simulate the effect of fluid flow on a porous media. Pore sizes and shapes are also of interest. my concern is that fluid flow cannot follow pore surfaces properly. I had seen a remeshing option in a webinar for 6.13 abq release https://youtu.be/gHtwz5hC28o?t=864 . Even though I have already checked manuals and all the tutorials I could find in internet, I did not find anything related to procedure of doing remeshing in eulerian domain.
Kind regards
I see, adaptive mesh refinement (AMR) is indeed available for the Eulerian domain. But this is generally different from the adaptive remeshing feature used for Lagrangian domains. Try to get some information from the ABAQUS support.
Good luck!
i dont have abaqus support, though i have official product. anyway thank you for your replies.
Hi Emrah,
In most applications the adaptive remeshing is referred to Lagrangian mesh, as Eulerien mesh is fixed in space. However, when large rotations occur, Eulerian mesh can be adapted as well (AMR), but that is not your case.
Another remark concerns adaptive Lagrangian mesh. According to my observations more stable results can be achieved by switching to Hourglass control + Distortion control in mesh module and turning off adaptive remeshing. If that is not enough and your task aborts, then try to use SPH (in Mesh module) but this may be very slowly.
Dear Mr. Sozumert,
ALE indeed can be used for CEL analysis. But it needs to be kept in mind that the Coupled Euler Lagrangian analysis was designed to be used only when ALE has already failed due to excessive mesh distortion, and hence has some limitations.
The ALE elements are always 100% full of a single material (unlike in CEL analysis, which allows the presence of multiple materials inside a single element). This is very important to note. While this ALE formulations limits the deformation of material in the model to the deformation of the elements, it allows for more precise definitions of material boundaries and more complex interactions.
The results obtained can hence be inferior to CEL results due to the ALE constraints applied on it, and therefore I request you to take care in the analysis.
As to how to do it, try section 12 in this link
http://abaqus.software.polimi.it/v6.14/books/usb/default.htm
With regards,
Vikrant Srivastava
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