Steady-State Laminar Flamelet Model

Tobias worked at the Robert Bosch AG company in the field of bio-mass combustion during his Master thesis


Detailed chemistry is the state of the art approach for combustion and chemical reaction analysis. The laminar flamelet model allows one to pre-calculate the thermo-kinetics in prior before the numerical simulation is started while tabulating the outcome into so-called look-up-tables. These tables are used to update the thermophysical quantities of the fluid during the simulation, and thus, no thermo-kinetic calculations are needed. This saves computational effort and allows in addition to using detailed chemistry mechanisms.

The flamelet model used two further passive scalars to approach the combustion field

The flamelet model can be explained relatively easily. The chemistry is pre-calculated and stored in look-up-tables. During the CFD analysis, two further trivial conserved equations are solved. Knowing the values of the two newly introduced quantities, which are known from the conserved equations, the correct physical data of the combustion can be extracted from the look-up-tables. Thus, no chemistry has to be solved, and the numerical calculation is much faster.

Released on 04.01.2021 — Downloads:

Image: Vortex and laminar flame front
Image: Mixture fraction distribution
Image: Diffusive flame sketch