使用GAO-YONG方程组对湍流边界层拟序结构特性的研究
The Simulation of Coherent Structure in Turbulence Boundary Layer Using GAO-YONG Turbulence Equations
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摘要: 与以往的湍流模型不同,GAO-YONG不可压湍流控制方程组不需要任何经验系数及壁面函数。其级数形式的能量方程与非线性现象多尺度层次相对应,具备了描述湍流统计平均和拟序结构的双重功能。本文采用交错网格和SIMPLE方法求解GAO-YONG不可压湍流方程组,考察了GAO-YONG方程组中能量方程阶数以及计算网格对拟序结构的影响,证明了该方程在描述拟序结构方面具有一定的适定性。
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关键词:
- 航空、航天推进系统 /
- 湍流 /
- GAO-YONG方程 /
- 拟序结构
Abstract: Unlike widely used turbulence models, the GAO-YONG model equations use no empirical coefficients or wall functions. And series form of energy equation corresponds to the scales of nonlinearity. In this paper, two-dimensional, incompressible turbulent boundary layer with zero pressure gradient is numerically simulated with GAO-YONG turbulence model. Employing staggered grid arrangement,an incompressible SIMPLE code is used. The calculation successfully simulates the coherent structures in the turbulent boundary layer and the effect of the order of the energy equation and grid scales on the coherent structures. All the results verify the adaptability of the equations to real intermittent turbulent flow.-
Key words:
- aerospace propulsion system /
- turbulence /
- GAO-YONG rational model /
- coherent structure
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