The DNS and the conditionally filtered LES(CFLES) were combined to examine the validity of the linear-diffusion approximation and the first-order closure in CFLES equation.The linear-diffusion approximation was applied to closing transport term in mixture-fraction space in CFLES equation,and the first-order closure was used in closing conditionally filtered reaction source term.The first two order moments of filtered mass-fraction of the reactant were obtained by using CFLES and were closed to results of the DNS,which well examined the validity of the approximations mentioned above. 更多
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