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Old   March 16, 2005, 15:48
Default Turbulence Specification Method
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Srivatsan V. Rajagopalan
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I am using a K-Epsilon turbulence modelling for simulatig a supersonic compreeible turbulent flow in a nozzle. Can anyone pls tell me what to specify in "Turbulence Specification Method" in the "inlet panel" of Boundary conditions?

The Help in Fluent uses a "Intensity and Hydraulic Diameter" Can any one explaain me why it is so?

Srivatsan
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Old   March 17, 2005, 05:11
Default Re: Turbulence Specification Method
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ROOZBEH
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Hi; You must set values as boundary condition for turbulence model equations, for example "k and e equations". You should set a value for k and a value for epsilon. But it is very difficult for a user to know what value is better to set. Instead, you can set values for turbulence intensity and viscosity ratio or hydrolic diameter. Fluent uses these values for boundary conditions. ROOZBEH
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Old   March 17, 2005, 12:49
Default Re: Turbulence Specification Method
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Srivatsan V. Rajagopalan
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HI Roozbez! Thanks for your suggstion. As mentioned by U, I use only Hydraulic diameter. Can U pls take a little time in eplaining me how to define Viscosity ratio? It depends on what? Thnk you in advance!
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Old   April 4, 2005, 00:50
Default Re: Turbulence Specification Method
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mahmoud
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Old   May 20, 2009, 20:24
Smile Hydraulic Diameter
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mahadevan.swamy@gmail.com
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Hi,

I am making a 2D case analysis by have a 2D body in a tunnel (plane). I don't know how to find the hydraulic diameter or the length scale of this problem. I do know that the air will be travelling at 27.76 m/s around the body. How do I calculate the hydraulic diameter for this 2D case? Any ideas? Thanks in advance

Swamy
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Old   January 31, 2011, 07:39
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Quote:
Originally Posted by mahadevan.swamy View Post
Hi,

I am making a 2D case analysis by have a 2D body in a tunnel (plane). I don't know how to find the hydraulic diameter or the length scale of this problem. I do know that the air will be travelling at 27.76 m/s around the body. How do I calculate the hydraulic diameter for this 2D case? Any ideas? Thanks in advance

Swamy
please refer to this website. http://support.esi-cfd.com/esi-users/turb_parameters/
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