reversed flow

bouzari2012 · July 12, 2013, 16:23

hi every one
I'm modeling blood flow in Aorta and I have velocity inlet boundary condition and pressure out lets when I try to iterate, I see this in fluent " reversed flow in xx faces on pressure outlet x". I can't change my boundary conditions so can you help me fix the problem.
and also my case is Laminar , steady ,3d and i use "Least Squares Cell Based"
I really need your help

cdegroot · July 14, 2013, 23:12

Looks like your problem is not converging very well. Try adjusting relaxation settings and maybe try coupled solver. Also make sure the outlet is far enough downstream that back flow wouldn't be expected physically.

jasdeep2006singh · July 15, 2013, 02:27

Check your flow direction as well. Or let it iterate for some time, it might stabilize.

Firas · July 15, 2013, 03:04

I agree with our friend check comment ....let your iteration go ahead and see the result in quess reversed flow will finish after numbers of iterations

July 12, 2013, 16:23	reversed flow	#1
bouzari2012 New Member sajjad bouzari Join Date: Feb 2013 Posts: 4 Rep Power: 13	hi every one I'm modeling blood flow in Aorta and I have velocity inlet boundary condition and pressure out lets when I try to iterate, I see this in fluent " reversed flow in xx faces on pressure outlet x". I can't change my boundary conditions so can you help me fix the problem. and also my case is Laminar , steady ,3d and i use "Least Squares Cell Based" I really need your help __________________ best regards

July 15, 2013, 02:27	Check	#3
jasdeep2006singh New Member Jasdeep Join Date: Oct 2012 Posts: 13 Rep Power: 13	Check your flow direction as well. Or let it iterate for some time, it might stabilize.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Significant Reversed Flow at Outflow Problems [ANSYS FLUENT]	NormalVector	ANSYS	1	May 15, 2012 23:50
Reversed Flow for a tenth slice of a rotor	neptunemmx	FLUENT	10	January 30, 2012 13:51
Reversed flow...>>>Please HELP...!	sushii	FLUENT	14	October 29, 2007 04:27
reversed flow at velocity inlet / mass flow inlet	ib	FLUENT	1	March 26, 2007 13:11
reversed flow	Sastry	FLUENT	5	March 22, 2007 08:05

July 14, 2013, 23:12		#2
cdegroot Senior Member Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 414 Rep Power: 17	Looks like your problem is not converging very well. Try adjusting relaxation settings and maybe try coupled solver. Also make sure the outlet is far enough downstream that back flow wouldn't be expected physically.

July 15, 2013, 03:04		#4
Firas New Member Firas Join Date: Jul 2013 Location: Iraq Posts: 8 Rep Power: 12	I agree with our friend check comment ....let your iteration go ahead and see the result in quess reversed flow will finish after numbers of iterations