Hi, I am new to SimScale, but very much like interacting with it so far.
I am trying to simulate the pressure and deformation at the center (sample location) of a pressure cell, where the sample is contained in a hole inside a steel disc, which is squeezed between diamonds.
After optimizing the meshing parameter, the meshing seems successful, but the simulation run always fails, with the error that the residual of the MUMPS solver is too high.
Please find attached the error screenshot, and the link to the project below: Pressure cell project
I am not sure if you tried the suggestion from the error and refined the mesh. Could you please share the project URL here as well, so we can take a closer look and investigate if everything else is in order!
Hi @shenoy , thank you for getting back. Yes I did try to refine the mesh which solved the meshing errors, but maybe I am not understanding the correct refinement process. The project URL is included in the last bullet point. Thanks!
Hi @shenoy , I have checked again all parameters of the mesh, and they seem to conform to the system requirements. But the simulation run still fails. Is there something I am unable to optimize? I am tempted to increase the ‘Linear system relative residual’, but from what I read, it’s not the best practice, especially since in my case it is 1e+10 larger than the max. allowable value.
If I may drop my 2 cents , I believe the issue lies in these contacts being sliding and there being only a fixed support as a constraint on the whole assembly:
Remember that sliding contacts will alow for relative motion between parts. Since you have a static analysis, the presence of rigid body motion will make it unstable and ultimately fail.
Some possible solutions in this case:
Change all of the contacts to be bonded instead
Set some sort of elastic support to stabilize the simulation
Run a dynamic study instead, since it allows for rigid body motion
.