Discussion Forum

Hi,

I am attempting to add a surrounding pressure to my entire flap based check valve model in COMSOL. The performance of the valve at various ocen depths is being investigated, hence it is desired to vary the surrounding hydrostatic pressure (most likely through an auxiliary/parametric sweep). This is important because the stiffness of the PDMS flap within the valve will change with the increasing pressure boundary force. This pottentially altering the required fluid inlet flowrate.

I was able to simulate the hydrostatic pressure in a COMSOL model that included solely the PDMS flap and a constant force. When I try to apply the same method in the FSI model (applying a pressure boundry load to all sides of the flap) I receive a 'Attempt to evaluate real square root of negative number' error. Other attempts also gice similar but different not convergence errors.

I am unable to get the simulation working with sweeps and mesh refinements. Is there a way to create a simple pressure chamber within comsol the I can put my model in?

Thanks for any help/advice

Luke LaFond