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-   -   Modeling of flows closer to Kolmogorov Scale (http://www.cfd-online.com/Forums/main/111420-modeling-flows-closer-kolmogorov-scale.html)

 Prashanth.A January 6, 2013 19:00

Modeling of flows closer to Kolmogorov Scale

I am trying to simulate a leakage in a tank through an orifice in CCM+, the diameter of the orifice is 1um. I realize that the scale is smaller or almost closer to kolmogorov scale, as TKE would dissipate as heat, I am modeling using Spallart Allmaras Model which solves for viscosity alone. It would be quite helpful if someone has done similar work in the past. The literature on leakage rates in quite less.

 FMDenaro January 7, 2013 04:47

Quote:
 Originally Posted by Prashanth.A (Post 400385) I am trying to simulate a leakage in a tank through an orifice in CCM+, the diameter of the orifice is 1um. I realize that the scale is smaller or almost closer to kolmogorov scale, as TKE would dissipate as heat, I am modeling using Spallart Allmaras Model which solves for viscosity alone. It would be quite helpful if someone has done similar work in the past. The literature on leakage rates in quite less.

To tell the truth, I do not understand well your question... if your lenght scale is so small, you are forced to have a computational grid that describes both the tank and the orifice, isn't it?

The flow through the orifice is at very very small Reynolds number and is laminar... what do you want to model?

 Prashanth.A January 7, 2013 11:32

Thank you sir, I wanted to model both the tank and orifice (have mesh in place for it). My motive is to measure the rate of leakage which depends on my physics used for simulation. My first simulation was in fact done with laminar model, but I was a bit skeptic about choosing it. I am trying to find if anybody has done this work before, would help me in correlating.