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Does it make any sense to use rotation rate tensor for production estimation?

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July 9, 2013, 09:46	Does it make any sense to use rotation rate tensor for production estimation?	#1
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	Hi, It seems to me many CFD codes when they are doing the turbulence modeling using the relation $\tau_{ij}{\partial _j}{U_i}=\tau_{ij}W_{ij}$ instead of using strain-rate tensor, i.e., $\tau_{ij}{\partial _j}{U_i}=\tau_{ij}S_{ij}$ for the sake of numerical friendness. I fully understand why $\tau_{ij}{\partial _j}{U_i}=\tau_{ij}S_{ij}$ . But it seems to me that $\tau_{ij}W_{ij}=0$ due to $W_{12}=-W_{21}, W_{13}=-W_{31}, W_{23}=-W_{32}, W_{11}=W_{22}=W_{33}=0$ . Am I missing something? __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

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