KR108: How to resolve warning message saying the turbulent viscosity limited to viscosity ratio?


Also review Siebel Solution 2002233.

The message you are seeing is more a warning than an error. It stipulates that the ratio of turbulent viscosity over the laminar viscosity is large than 1e5.

While this is not an error per-say, it is usually unphysical to have such a high ratio (note that this ratio limit is defined in Solve-> Controls -> Limits).

This ratio becomes very high in region of high turbulence, where the grid is (in most cases) too coarse.

In many case, this message occurs at the beginning of a simulation and will disappear as the simulation converges.

If it doesn`t then the first step would be to refine the grid in the regions where this limit is reached (this ratio can be plotted using Display -> Contours).

You can either re-create (and refine) the grid in its entirety or you can adapt the grid "on the fly" using a grid adaptation based on the value of this ratio.





Show Form
No comments yet. Be the first to add a comment!