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Kspallard model BC ?

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Old   March 2, 2006, 04:33
Default Kspallard model BC ?
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I am modelling the 2D flow around a 3 airfoils in staggered position. I an unsing the kspallard turb model, which seems to suitable for this kind of simulation (?).

I have define a big CV around those airfoils and 4 boundary : Inlet_velocity, Pressure outlet and 2 symetry boundary (Is the the right BC?)and using segregated, defaults parameters for Pressure, momentumn., and SIMPLE. -For Inlet_velocity: I choose Turbulent Viscosity Ratio (as mentioned in the manual) , and fixe it to 1. -For Pressure_outlet: I choose Turbulent Viscosity Ratio (as mentioned in the manual) , and fixe it to 10.

I am facing some problems for big angle , close to the staaling point : Convergence problems (I am using the defaults parameters in Fluent) and Some "Turbulent viscosity limited to viscosity ratio of 1.0000+5". For the latest I have see several mail in the website (move to coupled explicite ..., FAS) But nothing seems to solve this problem, but I am not sure if am using the right BC .

Can somebody can help me ? please.


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