Boundary Conditions Definitions for Gambit

ntonkin · August 11, 2009, 14:28

I'm new to CFD. I'm using Gambit and Fluent. I'm reading and going through tutorials that have been set up by Cornell university.

http://courses.cit.cornell.edu/fluent/cfd/intro.pdf

They state "Also,read through the documentation for a boundary condition option to understand what it does before you use it (it might not be doing what you expect)" I can not find any documentation from Gambit that has this information. Can anyone send me in the right direction?

Thanks.

tas38 · August 13, 2009, 12:37

I believe the comment is in regard to boundary condition specification for the type of flow problem. Different boundary conditions are necessary depending upon the flow physics involved.

For example, for supersonic flows, pressure far-field boundary conditions are often employed. On such a boundary, the mach number and static conditions are specified. Such a boundary condition requires the activation of the ideal-gas model--this is noted in section 7.9 of Fluent users guide ver 6.3. If your flow were subsonic and it was desireable to specify a constant density, such a boundary condtion would be erroneous.

The fluent user's guide often suggests the conditions in which a specific boundary conditions would be applicable.

August 11, 2009, 14:28	Boundary Conditions Definitions for Gambit	#1
ntonkin New Member Nick Join Date: Aug 2009 Posts: 4 Rep Power: 16	I'm new to CFD. I'm using Gambit and Fluent. I'm reading and going through tutorials that have been set up by Cornell university. http://courses.cit.cornell.edu/fluent/cfd/intro.pdf They state "Also,read through the documentation for a boundary condition option to understand what it does before you use it (it might not be doing what you expect)" I can not find any documentation from Gambit that has this information. Can anyone send me in the right direction? Thanks.

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August 13, 2009, 12:37		#2
tas38 Senior Member Troy Snyder Join Date: Jul 2009 Location: Akron, OH Posts: 219 Rep Power: 18	I believe the comment is in regard to boundary condition specification for the type of flow problem. Different boundary conditions are necessary depending upon the flow physics involved. For example, for supersonic flows, pressure far-field boundary conditions are often employed. On such a boundary, the mach number and static conditions are specified. Such a boundary condition requires the activation of the ideal-gas model--this is noted in section 7.9 of Fluent users guide ver 6.3. If your flow were subsonic and it was desireable to specify a constant density, such a boundary condtion would be erroneous. The fluent user's guide often suggests the conditions in which a specific boundary conditions would be applicable.