I'm trying to estimate the coupling between seismic to displacement noise of the cavity using COMSOL. 

From the design, the strain due to the seismic noise is about 2e-11.  But we want to see what happen if the support positions are moved away from the specified points a bit. This time the model is a whole cavity, not just 1/8 as I did before. This is to see results of the mis-positioned support points. However, COMSOL has some problems

• The solution for the full sized cavity is not symmetric even with the optimum support points. I think this is because the mesh size is not physically symmetric, but the result gets better (the sagging becomes more symmetric) when the mesh size is smaller. However, the calculation time is quite long (~3.5 minutes for each run).
•  I cannot adjust the angle, I can only adjust the beam line position. I'm not sure why COMSOL has this problem. It is not a syntax problem. I ran the iteration and it gave me two results , then the error message poped out. So I only changed the support positions along the beam line direction 
• The random I used is white, where the error is +/- 0.5 mm. I could not use Gaussian, because sometimes the support positions were out of the spacer. I think It should be fine for now to see how the result will be

Right now I have ~30 data points after 4 hrs of running the simulation. I'll get a bit more data and will see how it goes when I histogram it.