(189g) A Flame-Progress Variable Method with Heat Loss for Efficient Simulation of Flames and Fires.

A combined model utilizing a flamelet-progress variable approach to simulate premixed and non-premixed flames including the effects of heat loss is presented. Open-source code using this model to generate and interpolate inside a lookup table based on a simulation’s results is provided. The lookup table uses a presumed beta probability density function (β-PDF) parameterized by the flame’s mean mixture fraction and variance to model the mixture fraction throughout. Accordingly, the lookup table is natively parameterized by a flame’s mean mixture fraction and variance, in addition to length and time scales. A graphical visualization of the challenges of transforming the lookup table to dimensions of enthalpy and progress variable rather than length and time scales is discussed. Results of flame data derived from simulations using the lookup table are compared to results from both experimental data and advanced turbulence models. In particular, effects of heat loss and soot formation are investigated, including investigation of the representation of the form of the subgrid mixture fraction PDF.