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Old   January 21, 2007, 18:48
Default Hi, I am trying to figure out
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Shawn Pfeil
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Hi,
I am trying to figure out what the appropriate boundary conditions are for a diffusive tracer at the outlet of a t mixer. I am using twoLiquidMixingFoam with gamma as the tracer. I know from Fick's law that I want zero gradient boundary conditions at the walls, and fixed value bondaries are fine at the inlet. However, neither of these make physical sense at the outlet. Is their a way to let the value float at this point?

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Old   January 23, 2007, 03:07
Default The "normal" way would be zero
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Ola Widlund
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The "normal" way would be zero gradient. The tracer is just convected out of the domain from upstream, anyway (upwind discretisation for the convective flux).

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