where does kEqns update its coeffient?

Samuel Twain · October 30, 2019, 22:20

Dear all:
I found that in kEpsilon.C ( https://cpp.openfoam.org/v7/kEpsilon_8C_source.html ) line 252 updated epsilon and G at the wall. Epsilon and G in cell centers of the first layer are updated before assembling epsilon matrix( updateCoeffs() can be found in epsilonWallFunction.C https://cpp.openfoam.org/v7/epsilonW...8C_source.html and line 175 to 230 do calculation). However, it seems that in kEpsilon.C k of cell centers in the first layer is not updated before kEqn. But for a kWallFunction (e.g. kLowReWallFunction.C https://cpp.openfoam.org/v7/kLowReWa...8C_source.html), it has a member function updateCoeffs() in line 97 to 161 and it does calculation of k on the wall. So my question is:
Should k be updated before assembling kEqn? But updateCoeffs() of k can't be found in kEpsilon.C
Each reply will be appreciated!
samuel

einstein_zee · October 31, 2019, 05:50

You may get your answer here:
http://www.tfd.chalmers.se/~hani/kur...nfoamFinal.pdf

Samuel Twain · October 31, 2019, 09:59

Many thanks to you! It really helps me!

October 30, 2019, 22:20	where does kEqns update its coeffient?	#1
Samuel Twain New Member samuel Join Date: Oct 2019 Posts: 15 Rep Power: 6	Dear all: I found that in kEpsilon.C ( https://cpp.openfoam.org/v7/kEpsilon_8C_source.html ) line 252 updated epsilon and G at the wall. Epsilon and G in cell centers of the first layer are updated before assembling epsilon matrix( updateCoeffs() can be found in epsilonWallFunction.C https://cpp.openfoam.org/v7/epsilonW...8C_source.html and line 175 to 230 do calculation). However, it seems that in kEpsilon.C k of cell centers in the first layer is not updated before kEqn. But for a kWallFunction (e.g. kLowReWallFunction.C https://cpp.openfoam.org/v7/kLowReWa...8C_source.html), it has a member function updateCoeffs() in line 97 to 161 and it does calculation of k on the wall. So my question is: Should k be updated before assembling kEqn? But updateCoeffs() of k can't be found in kEpsilon.C Each reply will be appreciated! samuel Last edited by Samuel Twain; October 31, 2019 at 03:03.

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October 31, 2019, 05:50		#2
einstein_zee Member Hosein Join Date: Nov 2011 Location: Germany Posts: 93 Rep Power: 14	You may get your answer here: http://www.tfd.chalmers.se/~hani/kur...nfoamFinal.pdf

October 31, 2019, 09:59		#3
Samuel Twain New Member samuel Join Date: Oct 2019 Posts: 15 Rep Power: 6	Many thanks to you! It really helps me!