Equations of k-Epsilon Model
 

Hello,

In the theory guide, it is noted that the term 3* in Equation 2.25 (p. 85) for the turbulence production is based on the “frozen stress” assumption [54]. This prevents the values of Epsilon and k becoming too large through shocks, a situation that becomes progressively worse as the mesh is refined at shocks.

I don't understand this explanation. What is meant by ''frozen stress'' and what is the significance of ''shocks'' in this context ?

Thank you for your help

I am no expert in turbulence modelling - the manual has a reference for that statement so you will have to look up the reference.

But you should be aware that the shocks they are referring to are compressible flow shock waves.