Discussion Forum

Hi everyone,

I am using the acoustique pressure model 2D on COMSOL 3.5a version.
I am trying to simulate the wave reflexion on a plate. The incident wave I want to create is a spherical wave emmitting in all directions. (p_i_acpr=p0/R*exp(-i*k_acpr*(kix*x+kiy*y)). When this wave meets the plate, I create a second wave (the reflected one). The reflected wave is emmitted with the same angle with the surface than the incident wave, but in the opposite direction (cf light reflexion). p_reflected=(1-alpha)*(1-delta)*p0/R_ref/R*exp(-i*k_acpr*(krx*(x)+kry*(y+0.2)))

First question : Do I really have to input the reflected wvave ? Can't comsol fiddle that out for me ?

Second question : The anechoic chamber in wich the wave is emmitted contains a plate on the ground. I was just going to adjuste Alpha and delta depending on the boundary. A basic way of coding it:
If (x,y) at boundary==plate
then alpha = 0.1 delta = 0.1
else
alpha = 0.9 delta = 0.9
end

Is this possible ? I guess there must be a simpliest way of doing it...

Thanks for your help !