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-   -   potential energy& static enthalpy in buoyant flow (http://www.cfd-online.com/Forums/cfx/22513-potential-energy-static-enthalpy-buoyant-flow.html)

 Atit May 3, 2006 10:05

potential energy& static enthalpy in buoyant flow

I solve for the flow with buoyancy effect. The reference pressure is 1 atm. I was wondering the things as follows: 1. The absolute pressure is the sum of 1atm, rho*g*h, and the pressure which is the output from CFX-Post. Am I right? 2. In case of vertical flow in a long constant area duct without heat or work transfer, I found that static enthalpy change is near zero while potential energy change is very big. So the sum of static enthalpy change and potential energy change cannot be zero. Then I suspect that, for the flow with buoyancy effect, the static enthalpy, that is the output from CFX Post, already plus the potential energy, g*h. Is that right? Thank you for your kind consideration.

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