Species and Energy source term unit.

nago · August 16, 2018, 05:42

Hi,all.

I try wall condensation of H2O gas,using OpenFOAM 2.3.1.
I modify rhoReactingBuoyantFoam.
Into YEqn.H, I add source term "Mass_sou" volScalarField ,and into EEqn.H "Eng_sou" .
I want to know the unit of Mass_sou and Eng_sou.
I think Mass_sou as "kg/m3/s" and Eng_sou "W/m3".
Is it right?

following is source code.

<<YEqn.H>>
fvScalarMatrix YiEqn
(
fvm::ddt(rho, Yi)
+ mvConvection->fvmDiv(phi, Yi)
- fvm::laplacian(turbulence->muEff(), Yi)
==
reaction->R(Yi)
+ fvOptions(rho, Yi)
+ Mass_sou
)

<<EEqn.H>>
fvScalarMatrix EEqn
(
fvm::ddt(rho, he) + mvConvection->fvmDiv(phi, he)
+ fvc::ddt(rho, K) + fvc::div(phi, K)
+ (
he.name() == "e"
? fvc::div
(
fvc::absolute(phi/fvc::interpolate(rho), U),
p,
"div(phiv,p)"
)
: -dpdt
)
- fvm::laplacian(turbulence->alphaEff(), he)
==
reaction->Sh()
+ fvOptions(rho, he)
+ Eng_sou
);

How can I find out the information?
please tell me...

Regard.

mitti · August 21, 2018, 18:14

Beside doing it per hand (you know the dimensions for rho and he and can calculate it from fvm::ddt(rho, he)) you could just add whatever as a source term and then run the simulation. OpenFOAM will tell you which dimensions you need.

nago · August 22, 2018, 01:57

Hi, mitti.

Thank you for replying in spite of my poor questions.
Calculations seem to proceed without problems.
I think that I could probably set as I intended.

I appreciate your response.

August 16, 2018, 05:42	Species and Energy source term unit.	#1
nago New Member Join Date: Aug 2018 Posts: 18 Rep Power: 8	Hi,all. I try wall condensation of H2O gas,using OpenFOAM 2.3.1. I modify rhoReactingBuoyantFoam. Into YEqn.H, I add source term "Mass_sou" volScalarField ,and into EEqn.H "Eng_sou" . I want to know the unit of Mass_sou and Eng_sou. I think Mass_sou as "kg/m3/s" and Eng_sou "W/m3". Is it right? following is source code. <<YEqn.H>> fvScalarMatrix YiEqn ( fvm::ddt(rho, Yi) + mvConvection->fvmDiv(phi, Yi) - fvm::laplacian(turbulence->muEff(), Yi) == reaction->R(Yi) + fvOptions(rho, Yi) + Mass_sou ) <<EEqn.H>> fvScalarMatrix EEqn ( fvm::ddt(rho, he) + mvConvection->fvmDiv(phi, he) + fvc::ddt(rho, K) + fvc::div(phi, K) + ( he.name() == "e" ? fvc::div ( fvc::absolute(phi/fvc::interpolate(rho), U), p, "div(phiv,p)" ) : -dpdt ) - fvm::laplacian(turbulence->alphaEff(), he) == reaction->Sh() + fvOptions(rho, he) + Eng_sou ); How can I find out the information? please tell me... Regard.

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August 21, 2018, 18:14		#2
mitti New Member Join Date: Nov 2016 Posts: 15 Rep Power: 10	Beside doing it per hand (you know the dimensions for rho and he and can calculate it from fvm::ddt(rho, he)) you could just add whatever as a source term and then run the simulation. OpenFOAM will tell you which dimensions you need.

August 22, 2018, 01:57		#3
nago New Member Join Date: Aug 2018 Posts: 18 Rep Power: 8	Hi, mitti. Thank you for replying in spite of my poor questions. Calculations seem to proceed without problems. I think that I could probably set as I intended. I appreciate your response.