Scattered field

Hi every one,

I am trying to simulate a scatter field for the 2d wave equation using FF++.
the code runs but the result is that the scattered field is always zero which clearly not true, it is zero until t=11, then waves should exit the scatterer location.
please, can anyone check my code and tell me where is the error? u scatter.edp (1.8 KB)

Thank you,
Mordechai.