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boundary conditions of impressible jet injection

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Old   May 8, 2016, 11:22
Default boundary conditions of impressible jet injection
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lipf
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Hello Foamers,

I am trying to simulate a air jet injection into an heated open ambient. The air is coming out from a pipe (diameter 2mm) with a velocity of 5 m/s and a temperature of 300k. The pressure and temperature of heated open ambient are 1atm and 500k respectively. Obviously, it is an incompressible case, so I used incompressible solver “simpleScalarTransportFoam” that created by myself(implementing a transport equation of scalar “T” into the simpleFoam, and I have tested this solver on other cases, the results have showed the solver is correct).

But, when I calculated jet injection, several boundary conditions were tried while all results were wrong.

As initial case I am considering a 2D rectangular geometry. Inlet is set on the top side, other sides(left, right, bottom) are all open ambient.

If you have any suggestions regarding left, right and bottom boundary conditions(about 0/U, 0/p, 0/T), Please give me some ideas. Any help would be very much appreciated.
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