CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Kspallard model BC ?

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   March 2, 2006, 04:33
Default Kspallard model BC ?
Posts: n/a

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.


  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Centrifugal Pump and Turbulence Model Michiel CFX 12 January 25, 2010 04:20
Problems bout CFD model of biomass gasification, Downdraft gasifier wanglong FLUENT 2 November 26, 2009 00:27
Reynolds Stress model in CFX vs Fluent Tim CFX 1 October 7, 2009 06:19
help for different between les model (subgrid-scale model) liuyuxuan FLUENT 1 October 2, 2009 15:25
Grid resolution for full-scale and down scaled model gravis Main CFD Forum 0 October 2, 2009 10:27

All times are GMT -4. The time now is 23:57.