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Is Jet mixing turbulent ?

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Old   May 3, 2020, 16:26
Post Is Jet mixing turbulent ?
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Yogesh Nalam
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Hello All,

I am simulating a nozzle flow in which a gas comes out of a convergent nozzle and mixes with surrounding atmosphere before impinging onto a surface normal to the jet flow direction. Both the gases (nozzle flow gas and atmosphere) are miscible.

1. How do I judge if I should use a turbulence model. If by Reynolds number, what should be the characteristic length for a convergent nozzle ?

2. Can jet mixing be always considered turbulent?

3. Is impinging jet always turbulent ?

Thank You!!
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Old   May 3, 2020, 16:51
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The Reynolds number for a round jet is:


Re = {U_j\, D\over \nu}


Where the characteristic length is the diameter D.


For more details you can check the section 5.1 of the book of Pope "Turbulent flows".
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Last edited by CFD_10; May 4, 2020 at 04:33.
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jet impingement, jet mixing, nozzle flow, turbulence and laminar

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