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Compressor Simulation Error- single passage to full domain!!

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Old   March 17, 2015, 04:20
Default Compressor Simulation Error- single passage to full domain!!
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I Have been trying to simulate a centrifugal compressor. I have made the mesh using bladegen and turbogrid. And the mesh seems to decent.

I am able to simulate the single passage domain without any trouble and the solution converges well. However, when I copy the mesh in CFX to obtain a full 360 mesh, i have convergence issues.

The thing is for the full 360 mesh, the solution converges when I impose pressure boundary conditions ( ie Pressure inlet and Static Pressure outlet). However, when I impose mass flow at the outlet my solution diverges and I get an FINMES ERROR. I am enclosing my mesh images here for both the single passage and complete domain.

I would be really grateful if anyone could assist me in this.

PS:- When I convert the single passage mesh to full 360 domain, I make an interface (GGI connection ) between the repeating periodic boundaries obtained as a result of copying the single passage mesh.

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File Type: jpg refined.jpg (34.6 KB, 16 views)
File Type: jpg refined_full_INT.jpg (54.0 KB, 14 views)
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cfx, compressor diffuser cfx, convergence issues, turbomachinery

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