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oscillation in residuals and force coefficients plots |
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#1 |
New Member
shayan
Join Date: Jul 2018
Posts: 22
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I am simulating flow around 2D hydrofoil in ansys fluent.
I am doing this for various angle of attacks between 0 to 20 degrees. the results are ok until 12 degree but after that residuals and lift and drag coefficients plots became oscillating. how can I solve this problem? for more information: the model is k-epsilon (realizable and standard wall functions). scheme is coupled and gradient option is green-gauss cell based. pressure, momentum, turbulent kinetic energy and turbulent dissipation rate are chosen second order. |
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#2 |
Senior Member
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Beyond 12 degree AoA, it is quite possible that the boundary layer is separating. If that is the case, then you cannot use standard wall function; it is not applicable for even slightly separating flows. So, you have to refine the mesh to maintain
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Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority. |
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#3 |
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shayan
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#4 |
Senior Member
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Wall Yplus is available under Turbulence category. You can plot its contours or xy-plot on the wall of the hydrofoil.
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Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority. |
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