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Enthalpy based energy equation

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Old   July 17, 2015, 08:08
Default Enthalpy based energy equation
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shahrooz
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Can anybody direct me to an article / book on how to treat enthalpy based energy equation in numerical solution.

any help is appreciated.
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Old   July 17, 2015, 09:37
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I think you should state your question a little more specific. Do you:
> need information on the actual statement of the enthalpy based energy equation?
> need information on discretisation for FV/FD/FE methods?
> need information on the actual solution of the resulting system of equations
> need other information, etc. ...

Right now from what I assume is that you need general information on this topic, so I would recommend books that cover all the questions above. A good start would be "Computational Fluid Mechanics and Heat Transfer" by Richard H. Pletcher.
http://iate.oac.uncor.edu/~manuel/li...20Anderson.pdf

If you get more specific with your question it might be easier for other users to give recommendations.
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Old   July 18, 2015, 19:55
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Quote:
Originally Posted by Edeluc View Post
I think you should state your question a little more specific. Do you:
> need information on the actual statement of the enthalpy based energy equation?
> need information on discretisation for FV/FD/FE methods?
> need information on the actual solution of the resulting system of equations
> need other information, etc. ...

Right now from what I assume is that you need general information on this topic, so I would recommend books that cover all the questions above. A good start would be "Computational Fluid Mechanics and Heat Transfer" by Richard H. Pletcher.
http://iate.oac.uncor.edu/~manuel/li...20Anderson.pdf

If you get more specific with your question it might be easier for other users to give recommendations.
I need advice on discretisation, my current approach is using quick scheme for convective fluxes (enthalpy) and include them in the source term, which means I take temperature as primary unknown and update enthalpy after each iteration(inner loop). is this correct?
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Old   July 18, 2015, 19:58
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I have written a working SIMPLE code which uses temperature based energy equation, I want to change that to entalpy/temperature based energy equation.
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Old   July 19, 2015, 16:51
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Quote:
Originally Posted by shahrooz.omd View Post
I have written a working SIMPLE code which uses temperature based energy equation, I want to change that to entalpy/temperature based energy equation.

you can use the equation for the total energy rho*(Cv*T + V^2/2), the advantage is that you can use the conservative form
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Old   July 19, 2015, 17:54
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Originally Posted by FMDenaro View Post
you can use the equation for the total energy rho*(Cv*T + V^2/2), the advantage is that you can use the conservative form
Thanks for advice but I can't do that for supercritical fluid flow, I calculate h from a multiparameter equation of state.
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Old   July 19, 2015, 19:04
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Thanks for advice but I can't do that for supercritical fluid flow, I calculate h from a multiparameter equation of state.

I don't know about this kind of problem but I am quite confident you can define a specific total energy of the supercritical fluid system by defining properly the internal energy from your multiparameter equation of state
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