High residuals in solid mechanics frequency domain simulations

Please login with a confirmed email address before reporting spam

I am relatively new to solid mechanics simulations. I am working on simple 2D frequency domain simulations of simple solid resonators, as shown below. (the blue part is silicone, the white part is steel with custom stiffness and density values). I apply a harmonic pressure load on the top surface(edge in 2D), and measure the surface response. The bottom surface(edge) is free, the side ones are fixed. The model works fine with relative tolerance of 1e-6 when the thickness of the model is large (ex: 5mm ). The width of the model is 5mm. Now when i reduce the thickness to say 0.5 to 1mm, the model is not able to converge to even a relative tolerance of 1e-3. 1)Could anyone guide me, how to debug this issue? I tried playing with the mesh, refining it further, but that doesn't work. 2)On a side note, is the aspect ratio of cells being close to 1 a stricter requirement in solid mechanics FEM than that in standard CFD problems?



Reply

Please read the discussion forum rules before posting.

Please log in to post a reply.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.