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Numerical investigation of the effect of turbulence modeling for flows with shocks and vortical structures

机译:湍流模型对具有冲击和旋涡结构的流动影响的数值研究

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High resolution discontinuous Galerkin (DG) discretization is used for RANS modeling of the complex shock dominated flow generated by gas issuing from a shock tube nozzle. The DG finite element discretization framework is used for both the flow modeling and the turbulence transport. Implicit time marching methodologies are used to enable large time-steps by avoiding the severe time-step limitations imposed by the DG discretization. Turbulent flow in the near wall regions and the flow field is modeled by the Spalart- Allmaras one-equation model. A p-type refinement procedure is employed to accurately represent the vortical structures generated during the development of the flow. The computed solutions showed qualitative agreement with experiments. Investigation of the effect of rotation on the turbulence modeling for shock dominated supersonic flows is vital for accurate resolution the large coherent and vortical structures in high-speed combustion and supersonic flow research.
机译:高分辨率不连续伽勒金(DG)离散化技术用于对由激波管喷嘴发出的气体所产生的复杂激波为主的流动进行RANS建模。 DG有限元离散化框架用于流动建模和湍流传输。隐式时间行进方法用于避免DG离散化带来的严重时间步长限制,从而实现较大的时间步长。用Spalart-Allmaras一方程模型对近壁区域的湍流和流场进行建模。采用p型细化程序来精确表示流动发展过程中产生的旋涡结构。计算结果与实验结果吻合。研究旋转对冲击为主的超音速流动的湍流模型的影响,对于准确解析高速燃烧和超音速流动研究中的大型相干结构和旋涡结构至关重要。

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