A ghost-fluid method for large-eddy simulations of premixed combustion in complex geometries

In this paper, a new ghost-fluid method for interfaces of finite thickness is described. It allows to compute efficiently turbulent premixed flames with a finite thickness in low-Mach flows. A level set algorithm is used to track accurately the flame and to define the overlapping region where the burned and unburned gases satisfy the jump conditions. These algorithms are combined with a fractional-step method to alleviate the acoustic CFL constraint. The full algorithm is verified for simple flame-vortex interactions and it is validated by computing a turbulent flame anchored by a triangular flame-holder. Finally, the algorithm is applied in the LES of an industrial lean-premixed swirl-burner.

[1]  T. Dupont,et al.  Back and forth error compensation and correction methods for removing errors induced by uneven gradients of the level set function , 2003 .

[2]  F. Ducros,et al.  A thickened flame model for large eddy simulations of turbulent premixed combustion , 2000 .

[3]  D. Veynante,et al.  Direct numerical simulation analysis of flame surface density concept for large eddy simulation of turbulent premixed combustion , 1998 .

[4]  Thierry Poinsot,et al.  Quenching processes and premixed turbulent combustion diagrams , 1991, Journal of Fluid Mechanics.

[5]  S. Osher,et al.  A Non-oscillatory Eulerian Approach to Interfaces in Multimaterial Flows (the Ghost Fluid Method) , 1999 .

[6]  F. Spellman.  Combustion Theory , 2020 .

[7]  Charles Meneveau,et al.  A priori testing of a similarity model for large eddysimulations of turbulent premixed combustion , 2002 .

[8]  T. Poinsot,et al.  Theoretical and numerical combustion , 2001 .

[9]  H. Pitsch,et al.  Large-eddy simulation of premixed turbulent combustion using a level-set approach , 2002 .

[10]  Robert D. Falgout,et al.  hypre: A Library of High Performance Preconditioners , 2002, International Conference on Computational Science.

[11]  J A Sethian,et al.  A fast marching level set method for monotonically advancing fronts. , 1996, Proceedings of the National Academy of Sciences of the United States of America.

[12]  T. Poinsot,et al.  Studies of mean and unsteady flow in a swirled combustor using experiments, acoustic analysis, and large eddy simulations , 2005 .

[13]  Charles J. Mueller,et al.  Vorticity generation and attenuation as vortices convect through a premixed flame , 1998 .

[14]  Y. Dubief,et al.  On coherent-vortex identification in turbulence , 2000 .

[15]  U. Piomelli,et al.  Turbulent structures in accelerating boundary layers , 2000 .

[16]  Heinz Pitsch,et al.  A consistent level set formulation for large-eddy simulation of premixed turbulent combustion , 2005 .

[17]  D. Veynante,et al.  Large eddy simulations of an acoustically excited turbulent premixed flame , 2000 .

[18]  H. Pitsch.  A G-Equation Formulation for Large-Eddy Simulation of Premixed Turbulent Combustion , .

[19]  P. Moin,et al.  A numerical method for large-eddy simulation in complex geometries , 2004 .

[20]  Miltiadis V. Papalexandris,et al.  Time-accurate calculation of variable density flows with strong temperature gradients and combustion , 2006, J. Comput. Phys..