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<p style="margin-bottom: 0in; line-height: 108%"><span style="font-size: 11pt;">Hi Neks,</span></p>
<p style="margin-bottom: 0in; line-height: 108%"><a name="_GoBack"></a><span style="font-size: 11pt;"></span><br style="font-size: 11pt;">
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<p style="margin-bottom: 0in; line-height: 108%"><span style="font-size: 11pt;">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.</span></p>
<p style="margin-bottom: 0in; line-height: 108%"><span style="font-size: 11pt;">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.</span></p>
<p style="margin-bottom: 0in; line-height: 108%"><span style="font-size: 11pt;">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.</span></p>
<p style="margin-bottom: 0in; line-height: 108%"><span style="font-size: 11pt;">Now I am wondering, if Nek can not implement the given heat flux BC correctly. Did anybody have similar experiences?
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<p style="margin-bottom: 0in; line-height: 108%"><span style="font-size: 11pt;">Thank you!</span></p>
<p style="margin-bottom: 0in; line-height: 108%"><span style="font-size: 11pt;">Theresa</span></p>
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