The Effect of Turbulent Scales on Low-Pressure Turbine Aerodynamics: Part A — An Optimized Turbulent Boundary-Condition
The Effect of Turbulent Scales on Low-Pressure Turbine Aerodynamics: Part A — An Optimized Turbulent Boundary-Condition
复制标题
湍流尺度对低压涡轮空气动力学的影响：A 部分 - 优化的湍流边界条件
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Florian Herbst
中科院分区：
文献类型：
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作者：
Christoph Müller;Florian Herbst
DNS和LES的精确流入条件可以通过三维周期性盒子或无限通道的资源密集型前驱体模拟来生成，在这种情况下，研究壁边界流动。一个更便宜和更灵活的选择是使用合成边界条件。本文提出了一种改进的综合涡方法，它适合于涡轮机械应用的要求和规范。通过增加一个分离声波的机制，它将进一步扩展到亚音速可压缩流。应用该方法综合再现了一个涡轮机试验实例的尾流，并与相应的B部分论文中提出的原始叶栅模拟进行了验证。这种高度灵活的方法还提供了接口，规定非定常流入条件，通过随时间变化的速度，雷诺应力，和湍流长度尺度。
Exact inflow conditions for DNS and LES can be generated by resource-intensive precursor simulations of three-dimensional periodic boxes or infinite channels, in the case where a wall-bounded flow is investigated. A cheaper and much more flexible alternative is the use of synthetic boundary conditions. In the proposed paper, a modified synthetic-eddy-method will be presented, which suits the demands and specifications of turbo-machinery applications. It will further be extended to subsonic compressible flows by adding a mechanism to uncouple acoustic waves. It is applied to synthetically reproduce the wake of a turbine test case and validated against the original cascade simulation which is presented in the according Part B paper. This highly flexible approach also provides interfaces to prescribe unsteady inflow conditions, by temporally changing velocities, Reynolds stresses, and turbulent length-scales.