Stable LowRE model

M10 · March 8, 2012, 15:00

Hi,

I'm having difficulty obtaining a cleanly converged solution when for lowRe simulation. I've tried Standard k-e lowRe, AKN-k-e, and both of them produce answers that are quite oscillatory for all iteration counts. For the range of Re = 1e4-1e5, what are the reasonable turbulence models people use?

Thanks.

abdul099 · March 10, 2012, 03:46

Usually oscillations are no issue but physical behaviour. There are just a few really steady flows, you can nearly count them with the fingers of your hands. Most physical problems are unsteady, especially for higher Reynolds numbers.
So I assume, your chosen turbulence model is fine and the oscillations are just because the sovler tries to solve the physics.

March 8, 2012, 15:00	Stable LowRE model	#1
M10 New Member Mio S Join Date: Oct 2011 Posts: 4 Rep Power: 15	Hi, I'm having difficulty obtaining a cleanly converged solution when for lowRe simulation. I've tried Standard k-e lowRe, AKN-k-e, and both of them produce answers that are quite oscillatory for all iteration counts. For the range of Re = 1e4-1e5, what are the reasonable turbulence models people use? Thanks.

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March 10, 2012, 03:46		#2
abdul099 Senior Member Join Date: Oct 2009 Location: Germany Posts: 636 Rep Power: 22	Usually oscillations are no issue but physical behaviour. There are just a few really steady flows, you can nearly count them with the fingers of your hands. Most physical problems are unsteady, especially for higher Reynolds numbers. So I assume, your chosen turbulence model is fine and the oscillations are just because the sovler tries to solve the physics.