Reverse Flow and Convergence

myty · May 24, 2013, 14:11

Hi Everyone, when i am running natural converging heat transfer, residuals are converging smoothly but with a message that "reverse flow at in/out", is that a problem with solution or its not going to do anything with solution. Thanks

MAC88 · May 27, 2013, 03:35

I think you have recheck your boundary conditions.
How far is your outlet? May be you have to increase that distance too!!!

Best of luck!!!

myty · May 27, 2013, 12:57

Hey Aqib,

Thanks for your reply, i have a very simple setup of two parallel vertical plates (2D), I should make an imaginary outlet and a real one so that i could simulate my real dimensions and could avoid this message, is it what u r suggesting?

MAC88 · May 27, 2013, 13:34

I don't know what you are trying to say about imaginary outlet!
What boundary conditions you are using?
How the flow physics of your case is behaving?

Regards:
Chishty

myty · May 27, 2013, 13:40

I have pressure inlet/outlet BC. my geometry is 12.5cm long straight channel. residuals are smoothly converging.

MAC88 · May 28, 2013, 03:21

What about the flow pictures?
Anything reversal flow in the domain?

May 24, 2013, 14:11	Reverse Flow and Convergence	#1
myty New Member Join Date: Oct 2011 Posts: 19 Rep Power: 14	Hi Everyone, when i am running natural converging heat transfer, residuals are converging smoothly but with a message that "reverse flow at in/out", is that a problem with solution or its not going to do anything with solution. Thanks

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May 27, 2013, 03:35		#2
MAC88 New Member Muhammad Aqib Chishty Join Date: May 2013 Location: Islamabad, Pakistan Posts: 23 Rep Power: 0	I think you have recheck your boundary conditions. How far is your outlet? May be you have to increase that distance too!!! Best of luck!!!

May 27, 2013, 12:57		#3
myty New Member Join Date: Oct 2011 Posts: 19 Rep Power: 14	Hey Aqib, Thanks for your reply, i have a very simple setup of two parallel vertical plates (2D), I should make an imaginary outlet and a real one so that i could simulate my real dimensions and could avoid this message, is it what u r suggesting?

May 27, 2013, 13:34		#4
MAC88 New Member Muhammad Aqib Chishty Join Date: May 2013 Location: Islamabad, Pakistan Posts: 23 Rep Power: 0	I don't know what you are trying to say about imaginary outlet! What boundary conditions you are using? How the flow physics of your case is behaving? Regards: Chishty

May 27, 2013, 13:40		#5
myty New Member Join Date: Oct 2011 Posts: 19 Rep Power: 14	I have pressure inlet/outlet BC. my geometry is 12.5cm long straight channel. residuals are smoothly converging.

May 28, 2013, 03:21		#6
MAC88 New Member Muhammad Aqib Chishty Join Date: May 2013 Location: Islamabad, Pakistan Posts: 23 Rep Power: 0	What about the flow pictures? Anything reversal flow in the domain?