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kw sst equation with nonlinear source term

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Old   February 11, 2018, 06:29
Default kw sst equation with nonlinear source term
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Jenna Yu
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Hi, guys! I am working at kw sst model with my own code. However, the kw equation diverged for 2D plate flow with Re of 1e6. Here is my eg:
1 2d plate flow, Re 1e6, 1st cell height 1e-5, yplus<1, no wall function, inlet velocity is 1m/s, material is water;
2 bottom line is wall boudary; left line and upper line are inlet; right line is outlet;
3 inlet k is 1.5*power((I*U),2), where I is turbulent intensity; inlet w is w=power(Cemu,-1/4)*sqrt(k)/l, where l is turbulent length scale;
4 wall boundary: k is 0; w is related to near wall distance, according to
5 peuso-time method;
6 non-linear source term: same as CFL3D, implicit method;
My Questions:
1 boundary condition for kw sst model? eg: inlet, outlet, wall, far-field
2 Initial value for kw, and would bad initial value lead to the divergence of kw equation?
3 How to take care of the nonlinear source term in kw equation?
4 The dt of kw equation and the dt of average fluid flow?
Is anyone experienced in solve kw equation?
Thank you very much.
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Old   February 18, 2018, 17:32
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Gert-Jan
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You posted in the "Freelancer" forum. That means you want to pay someone for the help. Is this right?
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Old   February 21, 2018, 02:32
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Jenna Yu
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Quote:
Originally Posted by Gert-Jan View Post
You posted in the "Freelancer" forum. That means you want to pay someone for the help. Is this right?
Thank your for your reply.
I do not know "Freelancer" forum means that I want to pay someone for the help. I want to seek for help for free, however, if someone, who could help me with this problem, asks for payment we could negotiate the price.
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boundary condition, kw sst, numerical method, stiff source term, wall

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