Significant Reversed Flow at Outflow Problems [ANSYS FLUENT]

NormalVector · April 17, 2012, 16:38

Hello,

I'm running a closed domain cardiovascular simulation comprised of 2 mass flow inlet boundary conditions with 5 outflow boundary conditions. When the solution is calculated, the boundary conditions are held correctly but there is a huge amount of reversed flow happening at the boundaries. I have had the solution converge before to what looks like an appropriate flow field but I had to change a boundary condition and re-run the simulation. Now it isn't converging.

I previously got the solution to converge by reducing the relaxation factors and starting with an initial velocity. Any ideas on how to eliminate reversed flow? Any help is appreciated.

NormalVector · May 16, 2012, 00:50

For those of you wondering, I think I may have solved my problem by initializing the solution using one of my inlets. As it turns out, initial conditions are important.

April 17, 2012, 16:38	Significant Reversed Flow at Outflow Problems [ANSYS FLUENT]	#1
NormalVector Member NormalVector Join Date: Oct 2010 Posts: 71 Rep Power: 16	Hello, I'm running a closed domain cardiovascular simulation comprised of 2 mass flow inlet boundary conditions with 5 outflow boundary conditions. When the solution is calculated, the boundary conditions are held correctly but there is a huge amount of reversed flow happening at the boundaries. I have had the solution converge before to what looks like an appropriate flow field but I had to change a boundary condition and re-run the simulation. Now it isn't converging. I previously got the solution to converge by reducing the relaxation factors and starting with an initial velocity. Any ideas on how to eliminate reversed flow? Any help is appreciated.

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May 16, 2012, 00:50		#2
NormalVector Member NormalVector Join Date: Oct 2010 Posts: 71 Rep Power: 16	For those of you wondering, I think I may have solved my problem by initializing the solution using one of my inlets. As it turns out, initial conditions are important.