Energy equation

shovan · August 14, 2015, 09:46

Hi,

May i know in which Openfoam solver will i get the following equation:

Why different solvers using navier stroke's equation have different momentum and energy equations? The navier stroke's equation should be same for all solvers right?

chriss85 · August 17, 2015, 08:46

Equations may differ because a different energy is used. For example some use inner energy while others use enthalpy. Also, some solvers are compressible while others are incompressible.

shovan · August 18, 2015, 01:58

Thanks can you tell me in which solver of openfoam will i get the above mentioned energy equation.

regards
Shovan Kumar Sahu

mkraposhin · August 18, 2015, 02:20

reactingFoam can be the nearest choice, but without term #2 in RHS (sum h_j J_j)

But, if you will solve energy in enthalpies and assume Le number equal to 1, then term #2 in RHS will become compensated by enthalpy diffusion term

shovan · August 18, 2015, 02:39

Thank you all

August 14, 2015, 09:46	Energy equation	#1
shovan New Member Shovan Join Date: Jul 2015 Posts: 11 Rep Power: 10	Hi, May i know in which Openfoam solver will i get the following equation: Why different solvers using navier stroke's equation have different momentum and energy equations? The navier stroke's equation should be same for all solvers right?

August 18, 2015, 02:20		#4
mkraposhin Senior Member Matvey Kraposhin Join Date: Mar 2009 Location: Moscow, Russian Federation Posts: 355 Rep Power: 21	reactingFoam can be the nearest choice, but without term #2 in RHS (sum h_j J_j) But, if you will solve energy in enthalpies and assume Le number equal to 1, then term #2 in RHS will become compensated by enthalpy diffusion term Last edited by mkraposhin; August 18, 2015 at 03:36. Reason: english grammar

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August 17, 2015, 08:46		#2
chriss85 Senior Member Join Date: Oct 2013 Posts: 397 Rep Power: 18	Equations may differ because a different energy is used. For example some use inner energy while others use enthalpy. Also, some solvers are compressible while others are incompressible.

August 18, 2015, 01:58		#3
shovan New Member Shovan Join Date: Jul 2015 Posts: 11 Rep Power: 10	Thanks can you tell me in which solver of openfoam will i get the above mentioned energy equation. regards Shovan Kumar Sahu

August 18, 2015, 02:39		#5
shovan New Member Shovan Join Date: Jul 2015 Posts: 11 Rep Power: 10	Thank you all