Fixed mean temperature boundary condition for developing flow

mohsen cheraghi · July 22, 2011, 19:09

Dear all
My problem is to implement a temperature BC for the outlet of a developing flow in a channel when there is a constant heat flux at its walls. As we know the gradient of mean temperature is fixed. I tried fixedGradient and applied the fixed gradient to all profiles but it does not work, specially for high prandtls. I also tried fixedMeanValue but it does not work too!!
Is there a BC in openFoam to implement fixed mean temperature or fixed gradient mean temperature?
Thanks

mrshb4 · July 24, 2011, 13:33

Dear Mohsen

You should use second derivative boundary condition in your case(d2t/dn2 = 0) . if you google for those words you will find it!!!

khosh bashi
Mohammadreza Shetab

mohsen cheraghi · July 24, 2011, 14:06

ممنون از لطفتون آقای شتاب

July 22, 2011, 19:09	Fixed mean temperature boundary condition for developing flow	#1
mohsen cheraghi New Member mohsen cheraghi Join Date: Jun 2010 Location: Switzerland Posts: 28 Rep Power: 16	Dear all My problem is to implement a temperature BC for the outlet of a developing flow in a channel when there is a constant heat flux at its walls. As we know the gradient of mean temperature is fixed. I tried fixedGradient and applied the fixed gradient to all profiles but it does not work, specially for high prandtls. I also tried fixedMeanValue but it does not work too!! Is there a BC in openFoam to implement fixed mean temperature or fixed gradient mean temperature? Thanks

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July 24, 2011, 13:33		#2
mrshb4 Member Mohammad.R.Shetab Join Date: Jul 2010 Posts: 49 Rep Power: 16	Dear Mohsen You should use second derivative boundary condition in your case(d2t/dn2 = 0) . if you google for those words you will find it!!! khosh bashi Mohammadreza Shetab

July 24, 2011, 14:06		#3
mohsen cheraghi New Member mohsen cheraghi Join Date: Jun 2010 Location: Switzerland Posts: 28 Rep Power: 16	ممنون از لطفتون آقای شتاب