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 November 27, 2011, 19:25 simple question about boundaryT #1 Member   Join Date: Aug 2009 Posts: 67 Rep Power: 10 Hi guys, I run a 2D orifice geometry using dsmcFoam! The temperature inside the orifice geometry is 293 K and remains constant. The types of the boundary conditions are: wedge, wall, total pressure, pressureInletVelocity and "empty" for frontAndBackPlanes. In the "0" folder there is a boundaryT file, as i can see in the dsmc tutorials. I have to define the temperature for all the types of boundary conditions? And for the value, i will define uniform and 293 K? Thanks!!!

 November 28, 2011, 04:14 #2 Senior Member   Join Date: Mar 2011 Posts: 174 Rep Power: 8 The temperature is needed for boundaries where particles are being injected with a Maxwellian distribution. Therefore, you would not need this for empty, symmetryPlane and wedge boundaries (note that wedge does not work with dsmcFoam). The temperature value depends on the definition of your problem. I assume that the temperature of the gas in the containers upstream and downstream is 293K and therefore yes, you need to use "uniform 293".

 November 28, 2011, 05:00 #3 Member   Join Date: Aug 2009 Posts: 67 Rep Power: 10 Thanks a lot anon_a! I'll use symmetryPlane instead of wedge! Yes the temperature of the gas in the containers upstream and downstream is 293K, ok i'll use uniform 293!

 November 28, 2011, 05:09 #4 Member   Join Date: Aug 2009 Posts: 67 Rep Power: 10 For the wall of the orifice, i'll define uniform 293? The only thing i know is that the temperature of the gas in the containers upstream and downstream is 293K.

 November 28, 2011, 08:09 #5 Senior Member   Join Date: Mar 2011 Posts: 174 Rep Power: 8 Again, it depends on the definition of your problem. There is no readily available boundary condition for adiabatic walls in dsmcFoam and you don't specify another temperature for the walls so I guess I would use isothermal walls at 293K. That is the usual case.

 November 28, 2011, 18:56 #6 Member   Join Date: Aug 2009 Posts: 67 Rep Power: 10 Thanks anon_a!!!

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