Weird problem in FLUENT Species Transport
As mentioned in the title, I encountered a 'weird' problem when simulating multiphase+species transport. Originally, I tried simulating tank filled by fluid by turning on multiphase model and all things look well. Then I turned on species transport model to change the input fluid into certain mixture of fluid, other settings remain the same. I ran the simulation, but the result's contour shows the mixture is flowing upward(!). The gravity is -9.81m/s2 which I think is correct (and previous multiphase simulation is correct with -9.81m/s2). I had attached the image here, anyone know what happened?
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