Turbulent(eddy) viscosity
 

I need to specify turbulent viscosity ratio(http://jullio.pe.kr/fluent6.1/help/html/ug/img462.gif) for using k-epsilon model.

I could know the dynamic viscosity from the information of the material. However I don't think that eddy viscosity is a property of the material.

I found that eddy viscosity depends on the geometry and flow. Could you let me know how I can determine the Turbulent(eddy) viscosity? Is there any equation for determining the turbulent(eddy) viscosity????