# Turbulence Properties set to on or off

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 November 18, 2008, 04:32 Hi, just a quick one about #1 Member   Sven Degner Join Date: Mar 2009 Location: Zürich Posts: 54 Rep Power: 9 Hi, just a quick one about the turbulenceProperties Whats the different between a turbulence model (e.g. k-epsilon) with settings the "turbulence" keyword set to "off" or "on" ? set to "on", results with k and epsilon and all is fine! set to "off", the result are without k epsilon components, but a k-epsilon Model without k epsilon ???? How work this ? thanks and best regards , Sven

 November 18, 2008, 05:31 I think "off" removes the turb #2 Senior Member   Gavin Tabor Join Date: Mar 2009 Posts: 181 Rep Power: 9 I think "off" removes the turbulence model altogether; so it will simulate a laminar flow. I'm not quite sure what the difference is between this and using the "laminar" turbulence model, which I think has the same effect. Seems like a redundancy. Gavin

 November 18, 2008, 05:58 thanks Gavin, i compare two #3 Member   Sven Degner Join Date: Mar 2009 Location: Zürich Posts: 54 Rep Power: 9 thanks Gavin, i compare two cases, first the Modell laminar and second the K-eps with turbulence"off". all dict the same! but the solution is not the same, the residual curves are also different K-eps with turbulence"off" (conclusion without k and epsilon components) convergent quick and clean (maybe too clean) but the laminar model convergent rougher than the keps ! ? usually laminar convergent quicker than keps! best regards , Sven

 November 18, 2008, 06:03 laminar off = laminar solution #4 Member   Sven Degner Join Date: Mar 2009 Location: Zürich Posts: 54 Rep Power: 9 laminar off = laminar solution with turbulence off laminar on = laminar solution with turbulence on kepsilon_off = k-epsilon solution with turbulence off kepsilon_on = k-epsilon solution with turbulence on

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