Towards large eddy simulation of combustion in spark ignition engines

Large Eddy Simulation of Premixed Turbulent Flames Using the Probability Density Function Approach

“…More advanced methods include the artificially thickened flame (ATF/TFM) [9], where the chemical source term is modified to allow the flame to "thicken" and become larger than the mesh size; and the G-equation [10,11], where the flame front is explicitly tracked. All these methods require accurate predictions for the turbulent flame speed, which lead to the development of the Flame Surface Density (FSD) approaches [12,13], the Flame Surface Wrinkling Model [14] and the Coherent Flame Model reformulated for LES [15]. All these methods have common characteristics as they all look for a closure of the turbulent flame speed through the FSD equation and they are restricted to the premixed regime, in most cases away from the broken reaction zones.…”

Large Eddy Simulation and PIV Measurements of Unsteady Premixed Flames Accelerated by Obstacles

“…Recently, Richard et al [27] have proposed the solution of a transport equation for the sub-grid scale flame surface density (i.e., the sgs flame surface per unit volume) to handle nonequilibrium situations in LES of unsteady combustion during spark ignition engine cycles.…”

Numerical Methods and Turbulence Modeling for LES of Piston Engines: Impact on Flow Motion and Combustion

“…All the computations are performed with the AVBP LES code [12,28], which solves the compressible multispecies Navier-Stokes equations. The energy deposition [29] and…”

“…In particular, ICE simulations usually use low order and/or dissipative numerical schemes as well as simple Sub-Grid-Scale (SGS) turbulence models. Concerning numerical schemes, two classes of convective schemes are generally found in the literature: upwind-biased schemes are used by Jhavar and Rutland [8], Dugue et al [9] or Goryntsev et al [10] for instance while the Lax-Wendroff total discretization approach [11] (second order accurate in space and time) is used by Richard et al [12], Vermorel et al [6] or Granet et al [13]. Both of them are known to be very dissipative and a priori not well suited for LES [10].…”