Plot Eddy viscosity ratio in post-processing
Hi everyone,
I would like to know whether I can create a new parameter in HM CFD such "Eddy viscosity ratio" or "q-criterion"? I want to visualize the parameter using "slice plane". For Eddy viscosity ratio, the expression is:
Eddy viscosity ratio = eddy viscosity/dynamic viscosity
(reference: Turbulence Part 4 – Reviewing how well you have resolved the Boundary Layer | Computational Fluid Dynamics (CFD) Blog – LEAP Australia & New Zealand . look at the comment by the blog author on
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You can use the Calculate tool in Post to define new quantities. Assuming dynamic viscosity is constant - you can create a function using whatever turbulence outputs are available in the nodal quantities. Be aware that eddy-viscosity is typically represented as 'nu' kinematic, where material viscosity is typically represented as 'mu' dynamic.
Also - if you click the little 'lightning' icon in the 'Calculate' tool pop-up panel, the list of expressions will populate with a set of pre-defined variables. One of those is Q-Criterion.