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BUG: SpalartAllmarasDES: zero-valued subgrid-scale TKE field

Summary

The DES models of SpalartAllmaras produce zero-valued k fields whenever requested (e.g. by turbulenceFields.) The k is computed in SpalartAllmarasDES.C#L459.

Steps to reproduce

./Allrun the test case: GL2619-test-case.zip, and inspect any k field.

Environment information

3caeeb1f

Possible fixes

  • We need to understand why the current governing equations computing k field were used.
  • We had introduced and validated estimation functions for k, epsilon and omega by c7357bd1 for RANS SA model. Similar approximations can be used for DES SA model as well.