Tagged: boundary-layer, contour-plot, custom-field-function, help-me, y+, Zero-values
February 15, 2023 at 9:12 pmMitchell DurbinSubscriber
I am doing a project related to turbulent flow boundary layers. I am attempting to calculate u+ so that I can make a plot of u+ vs. log(y+) along a line normal to a nozzle wall.
I have defined u+ in the following way:
However, a contour plot of u+ in my domain shows that u+ is zero everywhere.
I suspected that perhaps either the velocity magnitude, wall shear stress, or density are also zero everywhere, but that is not the case:
Interestingly, the following custom field functions also resulted in a contour of zero everywhere:
And, the following custom field function resulted in nan everywhere.
Clearly there is something going wrong in the custom field functions when "wall-shear" is involved. However, as mentioned above, the wall shear stress itself is NOT zero anywhere.
How can correctly define u+ to avoid this issue?
February 16, 2023 at 2:19 pmRobAnsys Employee
Wall shear is technically zero on your contour as it's calculated on the wall. You're displaying on the fluid domain.
February 16, 2023 at 2:40 pmSRPSubscriber
Try to create custom function for u_tau then u/u_tau.
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