Compressible flow in a orifice and then a duct

https://www.simscale.com/workbench/?pid=395362524848180639&location=simulation:1abe69f8-2aae-4ad2-87d5-047cf36eb646&ps=analysis%2FboundaryConditions%2F0

This is the project I’m working on. The issue is: Maximum number of iterations exceeded when calculating temperature from a thermodynamic potential. This may be caused by low-quality mesh producing unrealistic pressure in a few cells or inappropriate boundary conditions, fluid properties or time step. Inspect fields for large values in the last time step. However, I believe the mesh is fine and I know the B.C are quite extreme but this is just the physics of the system. Thank you in advance.