Yes, it was available in Ansys support, The link was provided by ANSYS support. Thank You. I solved the issue. I re-assign the expression values as user defined variable and calculated area average value of heat capacity ratio again solved the issue.
https://support.ansys.com/KnowledgeResources/Solutions?solutionIdentifier=sol2042578&productName=ANSYS+CFX&productFamily=Fluid%20Dynamics
https://support.ansys.com/KnowledgeResources/Solutions?solutionIdentifier=sol2055112&productName=ANSYS+CFX&productFamily=Fluid%20Dynamics
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