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-   -   Total Energy and a Stage Interface (http://www.cfd-online.com/Forums/cfx/94461-total-energy-stage-interface.html)

aerost November 16, 2011 13:22

Total Energy and a Stage Interface
 
Hello,

I am trying to solve a rotor stator problem using the total energy heat transfer model (incl. viscous work). I have a GGI stage interface between the single peridodic rotor and the single periodic stator (pitch ratio 5:7). When I converge this solution though I find that there are very large but highly localized temperature gradients in the flow right at the stage interface. The rest of the domain is pretty close to isothermal, but there are 200+ degree F gradients at the interface. Total pressure is very constant and smooth over this area though.

Looking at the monitors, all of the mass and momentum residuals converge very well, but the Energy residual seems to flat line at ~2e-3...

Would adding a pressure profile decay help this at all? Is there any way to add a "Temperature profile decay" of some sort? I think it might help the solution converge. Any other ideas?

Thnanks.

ghorrocks November 16, 2011 19:51

Do not activate the viscous work model unless it will significantly contribute to the result. No point in activating unnecessary models.

This FAQ should give you some tips for getting it to converge:
http://www.cfd-online.com/Wiki/Ansys...gence_criteria


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