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提出旋转坐标下的单相液体湍流的二阶双系数动态亚格子应力大涡模拟模型并加以验证。考虑亚格子应力的对称性和量纲一致性 ,在基于应变率张量和旋转率张量的不可约量及 Smagorinsky模型和亥姆霍兹定理的基础上 ,提出亚格子应力应表示为可解的应变率张量和旋转率张量的函数。在贴体坐标系下 ,利用交错网格系统和有限体积法离散湍流控制方程 ,采用 SIMPL EC方法求解方程。水泵叶轮中湍流的流速分布规律和压力分布等计算结果都与试验结果基本吻合 ,从而证明了此模型的可行性 ,以及计算方法和程序的可靠性
The second-order large-scale dynamic two-coefficient dynamic subgrain stress large-eddy simulation model for single-phase turbulent flow under rotating coordinates is proposed and verified. Considering the symmetry and dimensional consistency of subgrain stresses, based on the irreducible quantities of strain rate tensor and rotation rate tensor, the Smagorinsky model and the Helmholtz theorem, it is proposed that the sub-lattice stress should be expressed as solvable The function of strain rate tensor and rotation rate tensor. In the body coordinate system, the staggered grid system and the finite volume discrete turbulence control equations, the use of SIMPL EC method to solve the equation. The flow velocity distribution law and pressure distribution of the turbulent flow in the pump impeller are consistent with the experimental results, which proves the feasibility of the model and the reliability of the calculation method and program