[Nek5000-users] Heat flux boundary condition

[nek5000-users at lists.mcs.anl.gov]

Hi Neks,


i am calculating a laminar pipe flow. The temperature boundary conditions are a fixed fluid temperature at the entrance and a constant wall heat flux over a short section in the middle oft the pipe. The remaining pipe wall is adiabatic. For the velocity field I assume periodic BCs.

Because the given heat flux contour over the axial coordinate should be an ideal hat-function, I expected the temperature gradient to have the same contour.

But when calculating the temperature gradient at the wall, the resulting temperature gradient contour doesn´t represent an ideal hat-function but a more rounded down contour.

Now I am wondering, if Nek can not implement the given heat flux BC correctly. Did anybody have similar experiences?


Thank you!

Theresa

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