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Geometry of Ambient?

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Old   June 20, 2016, 11:15
Default Geometry of Ambient?
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Micah G Bullock
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Hello All,

I'm new to CFD, and I'm not sure if I'm using the proper nomenclature. Please correct any mistakes if you see them! I'm trying to model a turbulent jet exhausting into open air, and I have a few questions about the geometry of the ambient model.

Should my ambient be modeled as a cone, with the angle corresponding to the growth rate of the jet outer boundary?

Or should it be modeled as a large cylinder, to allow the boundaries not to be too close to the outer boundary of the jet?

Also, should I put 0 gauge pressure Boundary Condition just at the end of the cone/cylinder, or everywhere on its faces?

The geometry of the ambient effects the Reynolds number, so I want to be sure to get an accurate 3D model.

Thanks in advance for your help!
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