High Value of HTC

Daniel

Hi everybody,

I have to perform a thermal and mechanical analysis with Ansys and I need to take the HTC e Tbulk temperatures BCs from a CFD analysis with CFX.

I applied Twall fix value condition, in CFX, on the walls of my model and I used k-omega model of turbolency. The y+ value of the grid on the walls is very small (<1).

When I analyse the results of CFX analysis, I see that the values of HTC and Heat flux on the walls are very high and they are not very credible (more than 10^5 W/m^2K).

I tried to read the CFX's manual and I found how CFX calculate the HTC value....but I don't found a solution of my problem.

How can I resolve this incident?

Regards

Daniel