# Energy Source Help!

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 October 24, 2005, 14:17 Energy Source Help! #1 Andrew Clark Guest   Posts: n/a I just want to clarify that I am using the Energy Source function correctly (the option under Fluids) I am attempting to take a tube with air flowing through it and inject a fuel into the flow at a certain mass, momentum and temperature. Note that I am using an inviscid coupled solver, so I cannot fix the temperature which I would have liked to have done I have figured out how to set the mass and momentum correctly as they are clearly stated in the user guide, however I am having problems setting the energy source correctly. It is my understanding that for inviscid flow: E = h + p/rho So for example if my temperature is 750K, the Cp is 1000, standard state temperature is 298.15K and the standard state enthalpy is 0, I can find h from: h = 1000*(750-298.5) + 0 Where would I get the pressure and density from? Are these the reference values, or the conditions of the source? The reason I question this, when I change the reference values, this has an effect on the final temperature of the source (that being once a cooler air has flowed over it)? Also is there anyway to verify I set the conditions correctly in Fluent, because when the air flows through the tube (at 200K), it also flow over the source therefore changing the temperature so I have no way of checking to make sure my source is in fact at 750K. Thank you Andrew ddmdddghj likes this.

 October 24, 2005, 14:39 Momentum Equation for Porous Media #2 Sherry Guest   Posts: n/a I tried to write down the governing equations for multi-phase flow in a porous medium. Does anybody know whether the velocity used in equation (7.19-30) of users guide is the physical velocity. If so, I think there are some problems for this equation compared to other models we usually use. Can I use the UDF to define the whole momentum equation by myself? Thanks a lot. I hope I can find someone who also use fluent to simulate the porous media and can give me some advices about it.

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