Fluent Transient Conduction Problem

Ravindra123 · May 10, 2013, 06:18

Hi all,
I am solving the 2D heat transfer in a rectangular domain(plate). The one side of the plate is subjected to convective BC with h(heat transfer coeff.) changing with time. I have given the sinusoidal profile of h from Define-profile menu in the fluent. The problem with my solution is that after doing transient analysis the heat transfer coeff at that wall is too large. e.g. when i did simulation with h=2000*sin(time) (used in the profile), the result i am getting is around 30000 for the h value.
Any help would be appreciated.

ahvz · May 10, 2013, 12:10

Please check the time steps (use automatic time steps) might be related to your problem...

Ravindra123 · June 25, 2013, 08:24

How to give automatic time stepping?

ahvz · June 25, 2013, 11:53

by change time steps from "fix" to "adaptive" in "run calculation" category then you will need to give end time at setting window...

May 10, 2013, 06:18	Fluent Transient Conduction Problem	#1
Ravindra123 New Member Ravindra Join Date: May 2013 Posts: 5 Rep Power: 13	Hi all, I am solving the 2D heat transfer in a rectangular domain(plate). The one side of the plate is subjected to convective BC with h(heat transfer coeff.) changing with time. I have given the sinusoidal profile of h from Define-profile menu in the fluent. The problem with my solution is that after doing transient analysis the heat transfer coeff at that wall is too large. e.g. when i did simulation with h=2000*sin(time) (used in the profile), the result i am getting is around 30000 for the h value. Any help would be appreciated.

May 10, 2013, 12:10		#2
ahvz Senior Member Moha Join Date: Mar 2013 Location: EU Posts: 103 Rep Power: 0	Please check the time steps (use automatic time steps) might be related to your problem... Ravindra123 likes this.

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June 25, 2013, 08:24		#3
Ravindra123 New Member Ravindra Join Date: May 2013 Posts: 5 Rep Power: 13	How to give automatic time stepping?

June 25, 2013, 11:53		#4
ahvz Senior Member Moha Join Date: Mar 2013 Location: EU Posts: 103 Rep Power: 0	by change time steps from "fix" to "adaptive" in "run calculation" category then you will need to give end time at setting window...