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# Air flow in an electronic box with NX thermal/Flow

Experimenter

Hello

I am doing a Coupled flow and thermal analysis for an electronic box and using NX Thermal/Flow 10.

And use the fan which is volume  rate of 70CFM.

Heat load is 100 Watt and atmosphere temperature is 50 degC.

Box material and other materials are aluminium 6061.

After steady state analysis, the maximum fluid temperature is 50 degC.

Whereas initial condition the fluid temperature was 50 degC.

and I did not see warming any surface neither heat source nor any surface.

Can somebody help me this problem?

5 REPLIES

# Re: Air flow in an electronic box with NX thermal/Flow

Solution Partner Creator

Hi CastawaY,

check if in "solve options" you choose both : solve thermal, solve flow

Best,

Sami

# Re: Air flow in an electronic box with NX thermal/Flow

Experimenter

Hi Sami

solve thermal and flow has been chosen. You can see  attachment.

I solved this design another cae program. There was no problem.

I don't understand what is wrong.

Best,

Oz

# Re: Air flow in an electronic box with NX thermal/Flow

Solution Partner Creator

Hi OZ,

Have you tried to use flow/thermal coupled solver? not NX Electronic System Cooling.

and don't forget to define coupling between disconnected geometries (for thermal)

Best,

Sami

# Re: Air flow in an electronic box with NX thermal/Flow

Legend

Is anything defined as a flow surface?  If not, there won't be any convection...

# Re: Air flow in an electronic box with NX thermal/Flow

Experimenter

Hi Sami

Thanks alot.

I solved the problem with your help.