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

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Abstract

The present study aims at the investigation of the effects of turbulence-chemistry interaction on combustion 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 velocityfrequency-composition PDF was used. The governing equations are solved by a consistent hybrid finite volume/Monte-Carlo algorithm on triangular unstructured meshes. A nonreacting 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 structures. The triple decomposition was performed, by dividing the coherent Favre-averaged velocity into time-averaged value and periodical coherent part, to analyze the coherent and incoherent contributions to Reynolds stresses. A simple 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 contours. Moreover, the association between turbulence production and vorticity saddle points is illustrated.

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Authors and Affiliations

  1. Department of Thermal Science and Energy Engineering, University of Science and Technology of China, 230027, Hefei, China

    Min-Ming Zhu, Ping-Hui Zhao & Yi-Liang Chen

  2. Research Center, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI, 53706, USA

    Hai-Wen Ge

Authors
  1. Min-Ming Zhu
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  2. Ping-Hui Zhao
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  3. Hai-Wen Ge
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  4. Yi-Liang Chen
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Correspondence to Min-Ming Zhu.

Additional information

The project was supported by the National Natural Science Foundation of China (50936005), and the Fundamental Research Funds for the Central Universities (WK2090130008, WK2090130011).

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Zhu, MM., Zhao, PH., Ge, HW. et al. Simulation of vortex shedding behind a bluff body flame stabilizer using a hybrid U-RANS/PDF method. Acta Mech Sin 28, 348–358 (2012). https://doi.org/10.1007/s10409-012-0028-4

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  • DOI: https://doi.org/10.1007/s10409-012-0028-4

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