Hello,
I was running a simulation for a liquid-solid layers (Scholte wave) using a linear transducer. Then, I want to run it for air-solid case (Rayleigh wave). I used the same parameters of Scholte wave case for the Rayleigh wave simulation. But, I changed the medium for air as follows:
%define top layer_air
cp1 = 331; % Longitudinal wave speed for tissue
cs1 = 0; % shear wave speed
rho1 = 1.29;
alpha0_p1 = 0.00; % absorption coefficient for water
alpha0_s1 = 0.00;
Also, for better stability, I changed the cfl to 0.05 from 0.1. t_end was chosen based on the distance and wave speed at each medium. I used the transducer.focus_distance = 15 mm (interface of air and solid). Interestingly, I found the maximum intensity at 25 mm (not at 15 mm where the focus is) after the fluid simulation. The same simulation I ran for water properties which was perfectly fine (focused at defined focus distance).
Can anyone please tell me why the focus distance has been changed for the Rayleigh wave case?