Scattering by a half-plane

Please login with a confirmed email address before reporting spam

Hello,

I am simulating the scattering of acoustic waves by a half-plane. The domain consists of a rectangular box with the half-plane at the bottom. The box is surrounded by PMLs shown in purple in the image below. Periodic boundary conditions are used in the front and back faces and the background field is a plane wave in the x-direction. I am using the pressure acoustics, frequency domain module and I would like to add a background mean flow in the x-direction.

I have thought of two possibilities:

1) Use the linearized Euler Equations first just to add the mean flow, and then use the acoustics module, but I didn't manage to couple the two things.

2) Modify the wave equation to go from the Helmholtz equation: to a convected Helmholtz equation

I tried using the dipole source as this will give the first order partial derivative, but the results I got don't seem to agree with the analytical model I have.

Is there any better way to include the effect of the background flow?

Thanks



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.