# Compressible flow in a orifice and then a duct

**URL:** <https://www.simscale.com/forum/t/compressible-flow-in-a-orifice-and-then-a-duct/101375>\
**Category:** Project Support\
**Created:** [October 4, 2026, 11:48am UTC](https://www.simscale.com/forum/t/compressible-flow-in-a-orifice-and-then-a-duct/101375 "2026-10-04T11:48:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![marcocortecchia](https://www.simscale.com/forum/letter_avatar/marcocortecchia/32/5_5575768a8748004e209b776fc1b2916d.png) [@marcocortecchia](https://www.simscale.com/forum/u/marcocortecchia)\
**Post date:** [October 4, 2026, 11:48am UTC](https://www.simscale.com/forum/t/compressible-flow-in-a-orifice-and-then-a-duct/101375/1 "2026-10-04T11:48:45Z")

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