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-   -   heat flux at fluid solid interface (http://www.cfd-online.com/Forums/cfx/96614-heat-flux-fluid-solid-interface.html)

Studentdrak January 27, 2012 05:32

heat flux at fluid solid interface
 
Hi

I am simulating a heat transfer problem where, one side of the solid domain has a wall heat flux in small patches(not all the wall on one side) and the other side of the solid domain has air flowing over it.

How does cfx calculate the heat flux at the fluid solid interface?

pl. do help asap

Regards

ghorrocks January 27, 2012 07:30

Yes, definitely. Look for the wall heat flux variable.

Studentdrak January 27, 2012 09:14

Hi ghorrocks

thanks.

I am running cases with finer and finer meshes (for grid independent study), but I dont see any considerable change in wall heat flux( number of nodes have been increased from 7,14,28,56 (for 6mm air gap)

and i want to know how does this wall heat flux(or local heat flux) and local delta Temperature vary. Is there a way to show these from results file in cfxpost?

Regards

Studentdrak January 27, 2012 10:33

1 Attachment(s)
Hi herewith i have attached the temperature contour. but the wall heat flux has almost the same value for all these cases. any suggestions pl.

singer1812 January 27, 2012 12:12

Why do you think that the wall heat flux changes?

If you are running a ss analysis, with constant heat coming in one side of the solid, air flow on another side and I assume adiabatic on the other sides, the heat flux will remain constant (qin=qout).

Mesh density will not alter this, energy should still balance out if convergence is achieved.

Studentdrak January 30, 2012 11:55

Thank u singer

Studentdrak January 30, 2012 12:05

Hello

I dont find any variation with respect to the mesh refinement.

Temperature is varying up to 2deg(at hot spots) with increasing the nodes 4 times the earlier coarser grid(step by step)

Is there a problem?

I use K epsilon model(scalable wall function)

pl. do suggest


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