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Simulation of vortex shedding behind a bluff body flame stabilizer using a hybrid U-RANS/pdf method

Acta Mechanica Sinica 2012年第2期28卷 348-358页

作者： Min-Ming Zhu Ping-Hui Zhao Hai-Wen Ge Yi-Liang Chen Department of Thermal Science and Energy Engineering University of Science and Technology of China230027 HefeiChina Engine Research Center University of Wisconsin-Madison1500 Engineering DriveMadisonWI 53706USA

The present study aims at the investigation of the effects of turbulence-chemistry interaction on combus- tion instabilities using a probability density function （pdf） method. The instantaneous quantities in the flow field were decomposed into the Favre-averaged variables and the stochastic fluctuations, which were calculated by unsteady Reynolds averaged Navier-Stokes （U-RANS） equations and the pdf model, respectively. A joint fluctuating velocity- frequency-composition pdf was used. The governing equa- tions are solved by a consistent hybrid finite volume/Monte- Carlo algorithm on triangular unstructured meshes. A non- reacting flow behind a triangular-shaped bluff body flame stabilizer in a rectilinear combustor was simulated by the present method. The results demonstrate the capability of the present method to capture the large-scale coherent struc- tures. The triple decomposition was performed, by divid- ing the coherent Favre-averaged velocity into time-averaged value and periodical coherent part, to analyze the coherent and incoherent contributions to Reynolds stresses. A sim- ple modification to the coefficients in the turbulent frequency model will help to improve the simulation results. Unsteady flow fields were depicted by streamlines and vorticity con- tours. Moreover, the association between turbulence produc- tion and vorticity saddle points is illustrated.

关键词： Vortex shedding pdf method Unsteady RANS Finite volume. Bluff bodies

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Simulation of bluff body stabilized flows with hybrid RANS and pdf method

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Acta Mechanica Sinica 2007年第3期23卷 263-273页

作者： Minming Zhu Xingsi Han Haiwen Ge Yiliang Chen Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei 230027 China

The motivation of this study is to investigate the turbulence-chemistry interactions by using probability density function （pdf） method. A consistent hybrid Reynolds Averaged Navier-Stokes （RANS）/pdf method is used to simulate the turbulent non-reacting and reacting flows. The joint fluctuating velocity-frequency-composition pdf equation coupled with the Reynolds averaged density, momentum and energy equations are solved on unstructured meshes by the Lagrangian Monte Carlo （MC） method combined with the finite volume （FV） method. The simulation of the axisymmetric bluff body stabilized non-reacting flow fields is presented in this paper. The calculated length of the recirculation zone is in good agreement with the experimental data. Moreover, the significant change of the flow pattern with the increase of the jet-to-coflow momentum flux ratio is well predicted. In addition, comparisons are made between the joint pdf model and two different Reynolds stress models.

关键词： Hybrid algorithm Unstructured mesh Finite volume method pdf method Bluff body stabilized flow

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