中国留德学人迎圣诞学术交流会及数学与应用数学学会2010年年会(GCMA.pdfVIP

2010 (GCMA Weihnachtsworkshop 2010) Karlsruhe 4.12.2010 “” Numerical simulation of turbulent combustion processes [9:10-9:55] Karlsruhe Engler-Bunte-Institute, Division of Combustion Technology feichi.zhang@kit.edu The CFD (computational fluid dynamics) simulation of combustion systems becomes meanwhile an important and reliable tool in designing and optimizing combustion devices like combustion engines or gas turbines. For such industrial flows with high Reynolds number (Re), the resolution of all turbulent scales and the computation of all reaction species is not possible due to computational costs. For this reason, modeling is needed to simplify the underlying physics, namely: turbulence and combustion. On one hand, the classical RANS (Reynoldʼs averaged Navier Stokes approach) method provides only information about the time mean variables of the flow and lack detailed transient characteristics; on the other hand, the LES (Large Eddy Simulation) offers the possibility to resolve the ʻlargeʼ unsteady flow structures and it seems as a good compromise between computational costs and additional accuracy. In the current work, a Unified Turbulent Flame Speed Closure or UTFC model for turbulent combustion modeling is presented, where the turbulent flame speed S is used to t descri