fireFoam combustion properties

tobyB · August 30, 2013, 05:21

Hello,

Could anyone help me find out where combustion properties are located in fireFoam? I am using oppositeburningpanels and can see that C3H8 has been used, and I do not seem to be able to find how they calculate or specify the heat released by combustion.
I also found a properties section for C3H8 in doxygen, it specifies rho, cp, and other things but not heat released.

Thanks

tobyB · September 3, 2013, 04:46

Cp combustion seems to be specified with cp polynomial coefficients in thermo.compressiblegas, then using enthalpy of different products before and after the reaction to get heat released.

Ok, so I have now found that varliable dQ specifies the heat released (in J), however I need to try and sum this value over each cell in the volume to get the total heat release rate.
Does anyone know how to do this in paraview? I have tried integrate variables, but that seems to only give me values for a single cell.
Exporting the grid to excel and summing all dQ values works, but it is quite a slow process.

Thanks,

Toby

August 30, 2013, 05:21	fireFoam combustion properties	#1
tobyB New Member tobyB Join Date: Aug 2013 Posts: 11 Rep Power: 12	Hello, Could anyone help me find out where combustion properties are located in fireFoam? I am using oppositeburningpanels and can see that C3H8 has been used, and I do not seem to be able to find how they calculate or specify the heat released by combustion. I also found a properties section for C3H8 in doxygen, it specifies rho, cp, and other things but not heat released. Thanks

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September 3, 2013, 04:46		#2
tobyB New Member tobyB Join Date: Aug 2013 Posts: 11 Rep Power: 12	Cp combustion seems to be specified with cp polynomial coefficients in thermo.compressiblegas, then using enthalpy of different products before and after the reaction to get heat released. Ok, so I have now found that varliable dQ specifies the heat released (in J), however I need to try and sum this value over each cell in the volume to get the total heat release rate. Does anyone know how to do this in paraview? I have tried integrate variables, but that seems to only give me values for a single cell. Exporting the grid to excel and summing all dQ values works, but it is quite a slow process. Thanks, Toby