Help to find the current ( fluent)

siddhu23 · January 28, 2019, 21:04

Hi folks,
I doing some study in the LED model analysis.

for Input current 200mA(applying as heatflux) i am getting temperature of LED 150℃.(temperature contour -->wall temperature)
I need to find out for 145℃ LED temperature what current i need to apply?

solving Problem in : steady state condition

AlexanderZ · January 28, 2019, 21:22

193?

best regards

siddhu23 · January 28, 2019, 21:29

Quote:

Originally Posted by AlexanderZ

193?

best regards

No If i reduce just 7mA We wont get 145.
In the problem we need to consider convection,conduction & radiation.

so i am asking how to find in the ansys fluent.
Since for solving the problem takes more time.
any way thank you for your response.

LuckyTran · January 30, 2019, 09:45

Just some clues.

You can use a DEFINE_PROFILE udf macro to define a variable that contains the vaule of the heat flux and apply this as the boundary condition. You can initialize this with 200 mA, or 193, or 192, or something.

Then you can use a DEFINE_ADJUST udf macro to change the heat flux based on some programmable logic.

Not clear to me is your objective function. You have to make a parameter out of this somehow.

Honestly I would probably just do it manually.

January 28, 2019, 21:04	Help to find the current ( fluent)	#1
siddhu23 New Member Siddharth Join Date: Nov 2016 Posts: 11 Rep Power: 9	Hi folks, I doing some study in the LED model analysis. for Input current 200mA(applying as heatflux) i am getting temperature of LED 150℃.(temperature contour -->wall temperature) I need to find out for 145℃ LED temperature what current i need to apply? solving Problem in : steady state condition

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January 28, 2019, 21:22		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	193? best regards

January 30, 2019, 09:45		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,682 Rep Power: 66	Just some clues. You can use a DEFINE_PROFILE udf macro to define a variable that contains the vaule of the heat flux and apply this as the boundary condition. You can initialize this with 200 mA, or 193, or 192, or something. Then you can use a DEFINE_ADJUST udf macro to change the heat flux based on some programmable logic. Not clear to me is your objective function. You have to make a parameter out of this somehow. Honestly I would probably just do it manually.