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Convergence error
Posted Apr 2, 2021, 2:26 p.m. EDT Electromagnetics, Materials, Mesh Version 5.5 1 Reply
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Hello,
I am new to COMSOL and trying to figure out why I am getting a convergence error when trying to run a simple joule heating and structural deformation test. The structure contains 2 copper blocks, 200 um wide, attached by a 1 um thick solder layer. The error I'm getting is given below:
Failed to find a solution. In Solid Mechanics: The relative error (0.011) is greater than the relative tolerance. There was a warning message from the linear solver. Iterative refinement triggered. Returned solution is not converged. Not all parameter steps returned.
Some possible solutions I tried are given below: 1) Reduce the size of the mesh 2) Add heat flux to allow the heat to exit and reach a stationary result
I am conducting a stationary study as that is what is required for my research. I am attaching the file to this post as well. I am not sure if missing material properties is causing this issue as well. Any suggestions are highly appreciated.
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Hello Waliul,
Your solid mechanics problem needs sufficient boundary conditions to remove all 6 rigid body motions, or else the problem does not have a unique solution. See e.g. this older thread and many more like it.
Best regards,
Jeff
-------------------Jeff Hiller