Mixing combustion of methane and air (2D)

Update: January 18, 2018
OpenFOAM 4.x

Case directory

$FOAM_TUTORIALS/combustion/reactingFoam/laminar/counterFlowFlame2D

Summary

Methane flows in from the region "fuel" and air (77% nitrogen and 23% oxygen) flows in from the region "air" at a velocity of 0.1 m/s and a temperature of 800 K, respectively, and they are combusted in the analysis domain. The post-combustion gas is exhausted from the region "outlet" to the outside of the analysis domain. The analysis is performed as an unsteady analysis from 0 sec to 0.5 sec.

Model geometry Model geometry

The chemical species and the combustion reactions with methane and oxygen are defined in the file "reactions" in the directory "constant" as follows. The properties of each chemical species are defined in the file "thermo.compressibleGas" in the same directory.

species
(
    O2
    H2O
    CH4
    CO2
    N2
);

reactions
{
    methaneReaction
    {
        type     irreversibleArrheniusReaction;
        reaction "CH4 + 2O2 = CO2 + 2H2O";
        A        5.2e16;
        beta     0;
        Ta       14906;
    }
}

These two file "reactions", "thermo.compressibleGas", are imported in the file "thermophysicalProperties" in the directory "constant" to read the settings.

The meshes are as follows.

Mesh Meshes

The calculation result is as follows.

Methane at 0.05 sec Methane at 0.05 sec
Methane at final tme 0.5 sec Methane at final tme 0.5 sec
Oxygen at 0.05 sec Oxygen at 0.05 sec
Oxygen at final tme 0.5 sec Oxygen at final tme 0.5 sec
CO2 at final tme 0.5 sec CO2 at final tme 0.5 sec
Water vapor at final tme 0.5 sec Water vapor at final tme 0.5 sec
Temperature at final tme 0.5 sec Temperature at final tme 0.5 sec
Flow velocity at final tme 0.5 sec Flow velocity at final tme 0.5 sec

Commands

cp -r $FOAM_TUTORIALS/combustion/reactingFoam/laminar/counterFlowFlame2D counterFlowFlame2D
cd counterFlowFlame2D

blockMesh
reactingFoam

paraFoam

Calculation time

1 minute 29.62 seconds *Single, Inter(R) Core(TM) i7-2600 CPU @ 3.40GHz 3.40GHz

Reference