Soot modelling

margaux · July 21, 2021, 12:16

Hello,
I am new to the use of OpenFoam in Fire Modelling, and I am wondering what is the difference between the two soot models available (mixtureFractionSoot<gasEThermoPhysics> and mixtureFractionSoot<gasHThermoPhysics>) and also what do the coefficients mean (nuSoot and Wsoot).
I already looked on google and on openfoam.org / openfoam.com + on this forum and it seems like my question hasn't been asked before.
Thanks

margaux · July 22, 2021, 05:41

http://www.tfd.chalmers.se/~hani/kur...sh_revised.pdf :

WSoot = molecular weight of soot
nuSoot= number of moles of soot

I still dont get the difference between the two soot models though, if anyone can help

Yann · July 22, 2021, 07:01

Hi Margaux,

To my knowledge, there is only one soot model implemented in OpenFOAM: mixtureFraction. (https://github.com/OpenFOAM/OpenFOAM...tureFraction.H)

The difference between gasEThermoPhysics and gasHThermoPhysics is only related to the thermophysical properties. You can either choose a thermo package based on the enthalpy (H) or the internal energy (E).

The form of energy you are using is defined in thermoType in the thermophysicalProperties file.
Have a look here : https://cfd.direct/openfoam/user-gui...#x36-2690007.1

It doesn't make a difference in the soot model, it only changes the form of the energy being solved.

Cheers,
Yann

margaux · July 22, 2021, 09:40

Thank you for your answer, I get the difference now !

have a nice day

duanwuCHEN · March 12, 2023, 06:06

Quote:

Originally Posted by Yann

Hi Margaux,

To my knowledge, there is only one soot model implemented in OpenFOAM: mixtureFraction. (https://github.com/OpenFOAM/OpenFOAM...tureFraction.H)

The difference between gasEThermoPhysics and gasHThermoPhysics is only related to the thermophysical properties. You can either choose a thermo package based on the enthalpy (H) or the internal energy (E).

The form of energy you are using is defined in thermoType in the thermophysicalProperties file.
Have a look here : https://cfd.direct/openfoam/user-gui...#x36-2690007.1

It doesn't make a difference in the soot model, it only changes the form of the energy being solved.

Cheers,
Yann

I wonder if OpenFOAM has the soot radiation interaction? Or more specifically, if I can set the absorption coefficient for soot. I really appreciate any help you can provide.

Niklas_fire · January 24, 2025, 13:43

Hi,

did this worked?

Niklas_fire · January 24, 2025, 13:46

Quote:

Originally Posted by duanwuCHEN

I wonder if OpenFOAM has the soot radiation interaction? Or more specifically, if I can set the absorption coefficient for soot. I really appreciate any help you can provide.

I am also, planning to do this, did this worked?

mdhfiz · February 19, 2025, 04:20

You could try this solver: https://github.com/acuoci/laminarSMOKE.git

It's called laminarSMOKE and it can perform detailed soot simulation for laminar flames.

July 21, 2021, 12:16	Soot modelling	#1
margaux New Member Join Date: Jul 2021 Posts: 3 Rep Power: 5	Hello, I am new to the use of OpenFoam in Fire Modelling, and I am wondering what is the difference between the two soot models available (mixtureFractionSoot<gasEThermoPhysics> and mixtureFractionSoot<gasHThermoPhysics>) and also what do the coefficients mean (nuSoot and Wsoot). I already looked on google and on openfoam.org / openfoam.com + on this forum and it seems like my question hasn't been asked before. Thanks

July 22, 2021, 05:41	By looking a bit deeper I found an answer to by second question	#2
margaux New Member Join Date: Jul 2021 Posts: 3 Rep Power: 5	http://www.tfd.chalmers.se/~hani/kur...sh_revised.pdf : WSoot = molecular weight of soot nuSoot= number of moles of soot I still dont get the difference between the two soot models though, if anyone can help

July 22, 2021, 09:40	very clear answer !	#4
margaux New Member Join Date: Jul 2021 Posts: 3 Rep Power: 5	Thank you for your answer, I get the difference now ! have a nice day Yann likes this.

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July 22, 2021, 07:01		#3
Yann Senior Member Yann Join Date: Apr 2012 Location: France Posts: 1,279 Rep Power: 29	Hi Margaux, To my knowledge, there is only one soot model implemented in OpenFOAM: mixtureFraction. (https://github.com/OpenFOAM/OpenFOAM...tureFraction.H) The difference between gasEThermoPhysics and gasHThermoPhysics is only related to the thermophysical properties. You can either choose a thermo package based on the enthalpy (H) or the internal energy (E). The form of energy you are using is defined in thermoType in the thermophysicalProperties file. Have a look here : https://cfd.direct/openfoam/user-gui...#x36-2690007.1 It doesn't make a difference in the soot model, it only changes the form of the energy being solved. Cheers, Yann

January 24, 2025, 13:43		#6
Niklas_fire New Member Niklas Join Date: Apr 2019 Posts: 5 Rep Power: 7	Hi, did this worked?

February 19, 2025, 04:20		#8
mdhfiz New Member Hafiz Ahmad Join Date: May 2019 Location: Brunei Posts: 22 Rep Power: 7	You could try this solver: https://github.com/acuoci/laminarSMOKE.git It's called laminarSMOKE and it can perform detailed soot simulation for laminar flames.