Retention time of gases in a chamber in CFX

jiguozhao · December 29, 2016, 09:24

Hi Guys,

I was simulating some gases flowing through a chamber from the inlet to the outlet. The gas was not going straight forward. It was going with spinning to form spiral trajectory. I want to know how long the retention time is. Is there any experienced user able to tell me how i can see the retention time in CFX?

many thanks!

evcelica · December 29, 2016, 12:18

I have heard of people plotting "time" on a streamline.

What I have done before for a scalar approach, is make an additional variable with a source term that adds one unit per m^3/sec to the entire fluid volume. Once converged, this will give you the residence time for the fluid at each location, including diffusion effects.

December 29, 2016, 09:24	Retention time of gases in a chamber in CFX	#1
jiguozhao Member Ji Guozhao Join Date: Jan 2011 Posts: 44 Rep Power: 15	Hi Guys, I was simulating some gases flowing through a chamber from the inlet to the outlet. The gas was not going straight forward. It was going with spinning to form spiral trajectory. I want to know how long the retention time is. Is there any experienced user able to tell me how i can see the retention time in CFX? many thanks!

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December 29, 2016, 12:18		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,188 Rep Power: 23	I have heard of people plotting "time" on a streamline. What I have done before for a scalar approach, is make an additional variable with a source term that adds one unit per m^3/sec to the entire fluid volume. Once converged, this will give you the residence time for the fluid at each location, including diffusion effects.