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引用次数: 0
摘要
湍流模拟方法的通常概念是施加一定的(部分)流动分辨率。在没有或几乎完全没有流动分辨率的极限状态下,这一概念就会出现问题:强加的流动分辨率与实际流动分辨率之间的差异可能意味着不可靠的模型行为和弥补模拟缺陷的高计算成本。基于变分分析的精确数学方法为这些问题提供了解决方案。采用这种方法设计的最小误差连续涡模拟(CES)可以在模拟过程中使模型主动响应流动分辨率的变化,根据需要增加或减少其对模拟的贡献。本文首次将 CES 方法应用于中度复杂、雷诺数相对较高的湍流模拟:NASA 壁挂式驼峰流。结果表明,CES 的性能与解析模拟方法相当,甚至更好,而计算成本仅为后者的一小部分。与流行的部分解析模拟方法(包括分离涡模拟和壁面建模大涡模拟)相比,CES 在计算成本和性能方面具有显著优势。在 CES 模拟的基础上,确定了渐近流动结构的特征。
Continuous Eddy Simulation vs. Resolution-Imposing Simulation Methods for Turbulent Flows
The usual concept of simulation methods for turbulent flows is to impose a certain (partial) flow resolution. This concept becomes problematic away from limit regimes of no or an almost complete flow resolution: discrepancies between the imposed and actual flow resolution may imply an unreliable model behavior and high computational cost to compensate for simulation deficiencies. An exact mathematical approach based on variational analysis provides a solution to these problems. Minimal error continuous eddy simulation (CES) designed in this way enables simulations in which the model actively responds to variations in flow resolution by increasing or decreasing its contribution to the simulation as required. This paper presents the first application of CES methods to a moderately complex, relatively high Reynolds number turbulent flow simulation: the NASA wall-mounted hump flow. It is shown that CES performs equally well or better than almost resolving simulation methods at a little fraction of computational cost. Significant computational cost and performance advantages are reported in comparison to popular partially resolving simulation methods including detached eddy simulation and wall-modeled large eddy simulation. Characteristic features of the asymptotic flow structure are identified on the basis of CES simulations.