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Difference between solvers: nearly incompressible compressible etc
Posted Jan 30, 2024, 7:56 a.m. EST 1 Reply
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Hi
I'm simulating a fluid-solid interaction and the nu = 0.49. I'm using Hyperelastic material for the material's model. I changed the solver from nearly incompressible to compressible and incompressible and I also tried linear elastic material. the Young's modulus is in order of megapascal. I don't see any difference between the material displacement. I looked in different places, but to be honest, I'm not sure what I should look for exactly. Can someone either introduces me a reference to look up what the difference is between each of these solvers and why I'm not getting any different results or if they know, let me know what's going on?
https://www.comsol.com/forum/thread/10958/Poisson-ratiov05 The link says if the nu=0.49, I should try nearly incompressible.
Thank you in advance.
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At nu=0.49 it should still be safe so the differences will be small. I think that value is mentioned to make sure that you are on the safe side.
If you want to study the effect, use something like 0.4999. What you expect to see then is a checkerboard pattern in the stresses if you don't use a mixed formulation.
-------------------Henrik Sönnerlind
COMSOL