Anonymous wrote:You'll need to tell a whole lot more info before anyone can make any usefull comment on the reasons of divergence.... What cell type(s) are you using? What is the maximum skewness in the domain? What discretisation, coupling and URs are you using? What Turbulence model? What kind of scales are involved? etc etc etc.
Out of interest... did you follow any courses on CFD at Uni? Are you using it at Uni?
Thanx for the response.
I am using at my own PC. I learn to use the software myself by following the tutorials. I have minimal knowledge on the CFD software, i read most of them from help files but not quite understand all. i am running analysis on a simplified race car model at 120kmh
Wind tunnel setting: according to Ahmed LES
505893 tetrahedral cells
minimum skewness 0.8 (could not find the maximum skewness)
Turbulence model: K-epsilon (2eqn)
k epsilon model: realizable
near wall treatment: non-equilibrium wall functions
turbulence specification method: intensity and length scale
turbulence intensity: 10%
turbulence length scale: 8% height of car
Momentum: Second order upwind
Pressure velocity coupling: SIMPLE
Turbulence Kinetic energy: Second order upwind
Tubulence Dissipation rate: Second order upwind
Solutions limit and others are set as default
I have tried with others type of turbulence model but the outcome is still the same.
i suppose i am not using the appropriate turbulence model or configurations.
Thanx again for the patience. Your advice is much aprreciated.