FireFoam what is HRR ?
Does anybody knows what the volumic scalar field HRR is? Because I thought that it was the combustion source term in the energy equation but it is sometimes negative.
Is it divided by the cell volume, because it can raise values around+/- 1E6 ?
Hi, I found this in the fireFoam source code :
- fvc::ddt(rho, hc)
- fvc::div(phi, hc)
+ fvc::laplacian(turbulence->alphaEff(), hc);
So it seems that the HRR is defined as all the source terms in the enthalpy equation except for the heat Fourier and turbulent diffusions. So, if I am right, source terms left are :
- heat due to chemistery
- heat due to friction, certainly close to zero because of very low Mach number of the flow
- radiated heat, but I swiched the radiation off
- inter spieces diffusion term, zero because all heat capacities are supposed to be equals
-the pressure term, very low
So I still don't understand why the heat release rate can be negative and positive depending on the cells, with so huge variations : -1E6 ; +1E6
Has anybody an idea ?
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