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Calculating Convection and Diffusion

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Old   September 28, 2015, 16:21
Question Calculating Convection and Diffusion
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Wade
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Hello,

I using Star-CCM+ to simulate the flow of hot (750 C), pure helium out of a small (2 mm ID) hole into room temperature air at atmospheric pressure. My question is whether there is a way to tease out convection and diffusion information for helium into air and air into helium.

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Old   October 5, 2015, 21:30
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I don't understand the question. Tease out?
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Old   October 5, 2015, 21:59
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Sorry, I was trying to ask if there is a way to obtain numerical values for the convection and diffusion. For instance, you can export the values for temperature, velocity, mass fraction, etc. Is there a similar way to export convection and diffusion information?
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Old   October 5, 2015, 22:31
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Shouldn't you be able to just make field functions for these? Maybe:
U-convection: div($Density*$$Velocity[0]*$$Velocity)
U-diffusion: div($DynamicViscosity*grad($$Velocity[0]))
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Old   October 6, 2015, 13:14
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Thank you for that suggestion. I have not done much with field functions yet. I will look into them and see if they will help me solve the problem I am working on.
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