Hello, I am studying aortic blood flow through SimVascular. Enter Fourier Modes when setting the inlet boundary condition. When I check the results, the flow waveform I entered is changed after setting up the Fourier Modes. Therefore, I would like to know how Fourier Modes is calculated to determine...

You have a very steep rise and fall in the flow rates in your input file. The code uses Fourier modes internally to interpolate this prescribed flow rate at each time step. However, Fourier modes cannot capture such sharp gradients and will create a smoother profile, which is sometimes oscillatory....

davep wrote: ↑

Thu Oct 19, 2023 10:17 am

Hello,

Finite elements is a discrete approximation to a physical process, the finer the mesh the better the approximation. Try increasing the mesh density to get a better approximation.

Cheers,
Dave

I'll try. Thank you Dave

I'm studying aortic blood flow through Simvascular. To do this, an issue occurred in the flow rate during several tests through the cylinder model. I'm aiming for the flow rate I entered to match exactly in the results as well. However, I tested several flow conditions and found that the flow rate w...