IMPLEMENTATION AND VALIDATION OF A NOVEL TABULATED CHEMISTRY TURBULENT COMBUSTION MODLE IN OPENFOAM
In recent years,Flamelet-Generated Manifolds(FGM) proposed by Van Oijen et al.has been widely used in the numerical simulation of various turbulent combustion flames and obtained encouraging results1-3.The FGM model builds a look-up table by computing a series of 1D laminar flamelet that takes into account the detailed chemical reaction mechanism.By considering the interaction between turbulence and chemical reaction by the Presumed-PDF(P-PDF) method,laminar flamelet look-up table expanded into a turbulent flamelet look-up table.Due to the limitations of P-PDF assumption itself,for example,the model assumes that the control variables are independent of each other,which is a strong assumption in many cases.And also,with increase of control variables or the reaction mechanism,the size of the look-up table increases exponentially and the memory requirements are huge.With the development and application of FGM model,more and more simulation results prove the limitation of P-PDF method.Bray et al.4 studied the sensitivity of average chemical reaction rates to three P-PDF methods in Sandia Flame D and compared the P-PDF method to DNS data.The results show that there is a remarkable gap between the three most widely used β-PDFs and the actual DNS data,and the assumed shape factors in the P-PDF method greatly affect the chemical reaction rate prediction.In a study of turbulent spray combustion models,Ge et al.5 found that the actual PDFs of the mixture fraction,gas temperature and enthalpy in the model was significantly different from the standard β-PDF.Based on the FGM model,this paper abandon the P-PDF method and combine the ESF model with the FGM model to directly consider the probability density function of the control variables.The new ESF-FGM model has been developed in this study and implemented in OpenFOAM.
Turbulent combustion Flamelet Generated Manifold model Eulerian Stochastic Field methods LES RANS OpenFOAM
YIFAN DUAN ZHIXUN XIA LIKUN MA JIARUI ZHANG XIANGYU CAO
College of Aerospace Science and Technology,National University of Defense Technology
国际会议
The 13th OpenFOAM Workshop(第13届OpenFOAM国际研讨会)
上海
英文
437-440
2018-06-24（万方平台首次上网日期，不代表论文的发表时间）