I think the scale of the PML should vary with the wave number, do you have any progress,
and could you share you analytical solution script to me.
Hello every one,
I’d like to excite a cylindrical waveguide (rigid in one face and flanged in the other one) with a monopole located in M(x,y,z) and compute the pressure inside the duct. Also, compute the far field radiation within comsol 3D.
I used Comsol to validate my analytical code in the case of a cylindrical duct with different boundary conditions. The results are perfect unless all the walls are hard except the outlet which is flanged (=I use the radiation impedance formulation of a baffled piston in terms of struve and bessel functions). To model the infinite baffle, I employed 2 PMLs . The first one has the same radius of the main duct. The second with a bigger radius (I obtained sound pressure level results as shown in the attached screen shot 1.5 a , 2a, 5a) .Please find herewith the model as well (with PLM 2 Radius = 1.5a) . I applied five elements in the swept direction in the PMLs ( the PML scaling factor is 1).
Could you please let me know how to adapt the 3D PMLs to the problem inorder to get better results ?
Best regards.
Aniss
and could you share you analytical solution script to me.
Hello every one,
I’d like to excite a cylindrical waveguide (rigid in one face and flanged in the other one) with a monopole located in M(x,y,z) and compute the pressure inside the duct. Also, compute the far field radiation within comsol 3D.
I used Comsol to validate my analytical code in the case of a cylindrical duct with different boundary conditions. The results are perfect unless all the walls are hard except the outlet which is flanged (=I use the radiation impedance formulation of a baffled piston in terms of struve and bessel functions). To model the infinite baffle, I employed 2 PMLs . The first one has the same radius of the main duct. The second with a bigger radius (I obtained sound pressure level results as shown in the attached screen shot 1.5 a , 2a, 5a) .Please find herewith the model as well (with PLM 2 Radius = 1.5a) . I applied five elements in the swept direction in the PMLs ( the PML scaling factor is 1).
Could you please let me know how to adapt the 3D PMLs to the problem inorder to get better results ?
Best regards.
Aniss