Is RANS e.g. k-epsilon available for negatively buoyant jets? -- CFD Online Discussion Forums

June 12, 2017, 08:16	Is RANS e.g. k-epsilon available for negatively buoyant jets?	#1
John-Lee New Member Join Date: Dec 2016 Posts: 4 Rep Power: 9	Dear all, I am currently doing simulation of fountain flow (negatively buoyant jet flow) which is formed by injecting dense (cold) water from nozzle into less denser (warm) ambient water. The Fluent can work when using DNS and LES model. However, when I switch to RANS model, e.g., k-e, k-w or RSM, there is something wrong. One is the software always warns the viscosity of most grids is limited to 1.0e5, no matter the coarse or finer mesh I created. Another one is the jet does not 'inject' into the ambient water, it just stay in the nozzle. Is there anyone can tell me what I can do? Thank you very much.

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