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viscous dissipation in fluent

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Old   June 17, 2019, 01:21
Default viscous dissipation in fluent
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Mohammad Ahmadi
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Hi
I have 2 questions.
1- Is it possible to define viscous dissipation in laminar flow?
2- How can I obtain dissipation in Fluent?

thanks
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Old   June 17, 2019, 12:12
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1. Yes. Turn on the energy equation and enable the viscous heat generation. If you are not referring to heat generation due to viscous effects but only the viscous losses in the momentum equation, those are always there in Navier-Stokes. You don't have to do anything. Just use the laminar model.
2. What do you mean by obtain? Like put it in your pocket? Or what?
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Old   June 18, 2019, 00:04
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thank you for your answer.
I mean how can I measure viscous dissipation in fluent?
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Old   June 18, 2019, 00:32
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I did this in OpenFOAM a long time ago.
In order to "measure" the effect of viscous dissipation, I chose an adiabatic boundary condition at the wall and ran the case twice. Do the same and you should then be able to see a slightly higher wall temperature using the dissipation option.

Regards,
Victor
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Old   July 5, 2019, 11:56
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Quote:
Originally Posted by LuckyTran View Post
1. Yes. Turn on the energy equation and enable the viscous heat generation. If you are not referring to heat generation due to viscous effects but only the viscous losses in the momentum equation, those are always there in Navier-Stokes. You don't have to do anything. Just use the laminar model.
2. What do you mean by obtain? Like put it in your pocket? Or what?
would you please tell me how can i compute V.D. in FLuent?
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