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nusselt calculation in patch

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Old   August 24, 2010, 15:43
Default nusselt calculation in patch
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Nima Sam
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i want to calculate the following expression


Nu=L*/(Tw-T0)d(T)/dy @y=0


how can i define d(T)/dy @y=0 at patch i in openFoam ?
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Old   August 29, 2010, 21:42
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follow the below link its totally helpful
http://www.cfd-online.com/Forums/ope...l?nojs=1#links

gradT.boundaryField()[patchi] =T.boundaryField()[patchi].snGrad();
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