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本研究着力于发展一种新的有限体积法和颗粒方法的混合算法 ,用于湍流 (冷态流以及反应流 )的速度 频率 标量联合PDF(probabilitydensityfunction)输运模型方程的数值求解 .采用一种基于无结构网格的有限体积法 ,求解质量、动量、能量平均守恒方程和平均状态方程 ,为联合PDF的输运模型方程的求解提供其所需的平均速度场和平均密度场 ;颗粒方法中 ,用MonteCarlo算法来求解PDF方程 ,为平均场的计算提供能源源项、雷诺应力、热通量、比热比等信息 .两种方法之间的耦合是一个关键 ,为了验证该算法的可行性 ,论文还对二维V型槽后的湍流冷态流场进行了数值模拟 ,并与实验、大涡模拟、k 模型的结果进行了比较 ,结果表明 ,该算法的结果与实验结果吻合得较好 .
This study focuses on the development of a new hybrid algorithm of finite volume method and particle method for the numerical solution of velocity-frequency-scalar PDF (probabilitydensityfunction) transport model equations for turbulent flow (cold flow and reaction flow) Based on the unstructured grid finite volume method, the average conservation of mass, momentum, energy, and average equation of state were solved to provide the required average velocity field and average density field for solving the coupled PDF transport model equation. In the granular method , The Monte Carlo algorithm is used to solve the PDF equation to provide information such as energy source term, Reynolds stress, heat flux, specific heat ratio and so on for the average field calculation. Coupling between the two methods is a key point. To verify the feasibility of the algorithm The numerical simulation of the turbulent flow in a two-dimensional V-groove is also carried out in the paper. The results are compared with those of the experimental, large eddy simulation and k model. The results show that the algorithm is in agreement with the experimental results Better.