During my initial review of your model, I noticed some mesh warnings associated with element size. These warnings could potentially impact the accuracy of the simulation results. To understand the context better, could you explain the reasoning behind the current meshing strategy? Additionally, I noticed that boundary conditions are defined on the interface between infinite elements and finite elements. Could you clarify the purpose of defining them there?

"I used the one-eighth wavelength rule for meshing. When using an infinite boundary, should we not define any boundary conditions in the initial step and implicit step? @Engr.Tufail

Well, using the one-eighth wavelength rule for meshing is a good practice. However, when using infinite boundaries with CINPE4 elements in Abaqus, you should avoid applying boundary conditions directly to the infinite elements in both the initial and implicit steps. Infinite elements are designed to absorb outgoing waves, and applying boundary conditions to them can interfere with this process. Let me know further about the progress. You can share the .cae and .jnl fiel with me as well with further notes, if required.

Hi, you can use ALID ( Absorbing Layers using Increasing Damping) method. i used it in my works.