Backflow

oozcan · October 19, 2018, 06:34

Hello guys,

I am working on cooling performance of some heat exchangers using in the buses. Model is consist of radiator,intercooler,oil cooler and fan. To review their performance has been prepared a wind tunnel. Air enters to the domain and run across a grill and then go through intercooler,oil cooler,radiator and fan,respecitvely.

Outlet side in the model has been extended more than inlet side. But pressure gradient at the outlet is more than at inlet. That is why, both pressure outlet and pressure inlet has backflow.

I have still not activated porous cell zones.if flow is desired and has a regime, then they wil be activated as porous cell zone.

Is there a way nor any way to eliminate backflow in that case?

Could it be ok if I decrease gauge pressure at the outlet (below zero gauge pressure) ?

Best Regards,

oozcan · October 22, 2018, 03:54

Anyone?

It will be appreciated!

Teddo · December 7, 2018, 13:11

You can extend your outlet length to eliminate backflow.

October 19, 2018, 06:34	Backflow	#1
oozcan Senior Member Onur Özcan Join Date: Feb 2016 Location: Istanbul/Turkey Posts: 461 Rep Power: 12	Hello guys, I am working on cooling performance of some heat exchangers using in the buses. Model is consist of radiator,intercooler,oil cooler and fan. To review their performance has been prepared a wind tunnel. Air enters to the domain and run across a grill and then go through intercooler,oil cooler,radiator and fan,respecitvely. Outlet side in the model has been extended more than inlet side. But pressure gradient at the outlet is more than at inlet. That is why, both pressure outlet and pressure inlet has backflow. I have still not activated porous cell zones.if flow is desired and has a regime, then they wil be activated as porous cell zone. Is there a way nor any way to eliminate backflow in that case? Could it be ok if I decrease gauge pressure at the outlet (below zero gauge pressure) ? Best Regards, Last edited by oozcan; October 22, 2018 at 03:53.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Inducing backflow restrictions in domain interface for multiphase flow	DarrenC	CFX	4	August 6, 2014 21:17
Modeling Backflow for a 3D Airfoil (Wing of Finite Span)	Josh	CFX	9	August 18, 2009 11:31
how to prevent backflow?	May Lim	FLUENT	2	June 20, 2007 12:17
Problem with integrals and averages if backflow??	Amit	FLUENT	0	October 19, 2006 18:54
Swirl in backflow on pressure outlets	Jonas Larsson	FLUENT	17	February 3, 2000 02:14

October 22, 2018, 03:54		#2
oozcan Senior Member Onur Özcan Join Date: Feb 2016 Location: Istanbul/Turkey Posts: 461 Rep Power: 12	Anyone? It will be appreciated!

December 7, 2018, 13:11		#3
Teddo New Member Join Date: Aug 2017 Posts: 3 Rep Power: 8	You can extend your outlet length to eliminate backflow.