[dinamikaC4]

Hi, all!

Currently, I am doing a combustion simulation using reactingFOAM and am a little bit confused about the combustion model provided in OpenFOAM.

What does the "laminar" combustion model mean? Does it refer to the "laminar flamelet model" or "laminar finite rate model"? I have searched from OpenFOAM's documentation and other online sources but still didn't get a satisfactory answer.

Thank you all and have a good day!

[harry123]

I think the laminar in momentumTransport just mean a laminar flow. The combustion models are given under combustionProperties. Both files are under the constant folder.

[dinamikaC4]

Hi Harry! Thanks for your reply.

What I mean by "laminar" is laminar for combustionModel under combustionProperties file, not the one under momentumTransport.

As far as I know, there are several combustionModel options that can be used to set combustionProperties, such as EDC, PaSR, and zoneCombustion, and one of those is laminar. However, I couldn't get enough information about this model and the detailed governing equation of this model.

Do you have any experience with this issue?

Thanks.

[dlahaye]

Information can be reversed engineering from the source code (at times not trivial).

Possibly you can start by looking in the member function defined in e.g. https://www.openfoam.com/documentati...8H_source.html (depending on the version of OpenFoam used)

   // Member Functions
  108 
  109        //- Correct combustion rate
  110        virtual void correct();
  111 
  112        //- Fuel consumption rate matrix.
  113        virtual tmp<fvScalarMatrix> R(volScalarField& Y) const;
  114 
  115        //- Heat release rate [kg/m/s3]
  116        virtual tmp<volScalarField> Qdot() const;
  117 
  118        //- Update properties from given dictionary
  119        virtual bool read();
  120

and the implementation in the corresponding C-file. Please give it a look and get in touch here with more specific questions.

[francescomarra]

Dear dinamikaC4,

I am not fully sure, but I think that using the keyword "laminar" in the combustionProperties file just means that no models for flame-turbulence interaction will be activated.
Thus, essentially, this would lead to a DNS simulation if you also use the laminar approach for the momentum equation and a sufficiently refined grid.

Hope I am correct.

Regards,

Francesco

[zd7s18533]

"laminar" means no chemistry/turbulence interaction model is used to modify the reaction source term in species equation and reaction heat release term in energy equation, even if turbulent model is active and the flow is turbulent

it could be suitable for laminar or DNS reactive flow where the grid is fine enough to resolve flame