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Retention time of gases in a chamber in CFX

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Old   December 29, 2016, 09:24
Default Retention time of gases in a chamber in CFX
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Ji Guozhao
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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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Old   December 29, 2016, 12:18
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Erik
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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.
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