Hello everyone, abaqus standard 

I am engaged in a sequentially coupled structural-acoustic analysis using Abaqus and facing a challenge with mesh incompatibility. In my model, the structural domain utilizes a fine shell mesh, whereas the acoustic domain employs a coarser tetrahedral mesh due to the larger acoustic wavelengths.

I'm following a tutorial from the Abaqus manual titled "Fully and sequentially coupled acoustic-structural analysis of a muffler". This tutorial employs acoustic interface elements and submodeling techniques where the outer layer of the structure is defined in an element set in the global model. In the submodel, the innermost elements of the air filling the cavity are attached to Acoustic Structural Interface (ASI) elements. Here is a snippet of the relevant code:

*Interface,elset=asi
*Nset,nset=asi,elset=asi
*Submodel, absolute=1.e-3, global elset=MufflerShell-1_I1 asi,

A key aspect of this tutorial is the direct node match between the global model and the submodel, a condition not present in my case due to the differing mesh densities.

Question: How can I effectively connect a fine mesh on a structural component to a coarser mesh in an acoustic cavity for a sequentially coupled analysis using the submodeling procedure? Are there specific Abaqus techniques or best practices to manage this interface effectively?

I would greatly appreciate any advice or insights on techniques to address this mesh transition challenge.

Thank you for your assistance!