How should I calculate the local Nu number?
I am making solution for plate impingement jet flow. As the mesh number increases, the average convection heat transfer coefficient on the plate, the average temperature and the average Nu number do not change. But for a single point at the stopping point, the local Nu number decreases as the mesh increases.
I define a point on the plate right in the middle. I get the local heat flux and temperature value of this point using facets average. Then I calculate the number Nu.
What could be the reason for this to happen at the stopping point? Am I going the wrong way to calculate the local Nu number?
Thanks for your help.