Continuity convergence issue for a multiphase flow in a counterflow heat exchanger

Andrea1984 · April 16, 2012, 05:02

Hello,

I'm performing a transient simulation of a particular kind of counterflow heat exchanger using VOF model; as I'm new to multiphase flow simulation I'm having some convergence troubles.
In particular all the scaled residuals are below the standard criteria of Fluent, except continuity, which remains pratically constant (at about 1e03) and doesn't even show the typical spike at the beginning of a new time step.
Anyone can help me or has experienced the same problem?

Thanks in advance,

Andrea

flow_CH · July 1, 2013, 10:29

i have exactly this problem. please help

oj.bulmer · July 24, 2013, 04:55

How are you sure you have used adequate timestep/inner loops? Have you tried decreasing the timestep?

OJ

April 16, 2012, 05:02	Continuity convergence issue for a multiphase flow in a counterflow heat exchanger	#1
Andrea1984 Senior Member Andrea Join Date: Feb 2012 Location: Leeds, UK Posts: 179 Rep Power: 16	Hello, I'm performing a transient simulation of a particular kind of counterflow heat exchanger using VOF model; as I'm new to multiphase flow simulation I'm having some convergence troubles. In particular all the scaled residuals are below the standard criteria of Fluent, except continuity, which remains pratically constant (at about 1e03) and doesn't even show the typical spike at the beginning of a new time step. Anyone can help me or has experienced the same problem? Thanks in advance, Andrea

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July 1, 2013, 10:29		#2
flow_CH Senior Member FHydro Join Date: Jan 2013 Posts: 197 Rep Power: 13	i have exactly this problem. please help

July 24, 2013, 04:55		#3
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	How are you sure you have used adequate timestep/inner loops? Have you tried decreasing the timestep? OJ