01 January 1970 2 838 Report

Hi all,

I have read many papers in which use two different formulas for Viscous Dissipation:

tau : grad(U)

tau : D [ D = 0.5* ( grad(U) + transpose(grad(U)) ) ]

Which one is correct?

Basically, Is there any difference between Stress Work & Viscous Dissipation?

Thanks

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