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February 11, 2018, 06:29 |
kw sst equation with nonlinear source term
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#1 |
New Member
Jenna Yu
Join Date: Sep 2014
Posts: 6
Rep Power: 12 |
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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February 18, 2018, 17:32 |
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#2 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,913
Rep Power: 28 |
You posted in the "Freelancer" forum. That means you want to pay someone for the help. Is this right?
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February 21, 2018, 02:32 |
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#3 | |
New Member
Jenna Yu
Join Date: Sep 2014
Posts: 6
Rep Power: 12 |
Quote:
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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Tags |
boundary condition, kw sst, numerical method, stiff source term, wall |
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