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Grad "U" Separation point, meaning

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Old   October 12, 2017, 07:58
Default Grad "U" Separation point, meaning
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Marius Lang
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Hi, I am doing a simulation of a cylinder at Re=100 and I want to find its separation point, I have used the command "postProcess -func "grad(U)"" to find the gradient at the wall. The wall grad U prints a file with 9 different components, what do they mean and where do I need to look to find separation point. See picture

Separation point is made when the gradient of the velocity field is zero if I am not mistaken.
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