流体力学界面不稳定性诱导的湍流混合现象广泛存在于各类自然现象和工程问题中.特别地,在工程流动问题中,一般涉及的是复杂初始扰动诱导下的湍流混合问题.这类混合问题往往多混合机制共存、主控参数宽泛剧烈变化.准确预测这些复杂性下混合区时空演化对于工程实践至关重要,雷诺平均 Navier-Stokes(RANS)和大涡模拟(LES)是工程应用最为可行的数值模拟方法.但是,现有 RANS 和 LES 建模面临难以统一预测各类混合问题等工程应用的难点.本文从工程应用视角,综述目前在 RANS和 LES建模方面的认识、存在的问题,以及团队的最新研究进展.
Progress in Modeling Turbulent Mixing Inudced by Interfacial Instabilities for Engineering Applications
Turbulent mixing induced by interfacial instabilities widely exists in various natural phenomena and engineering problems.Specifically,in typical engineering flows,involved turbulent mixing problems are usually triggered by intricate initial perturbations.This type of mixing problems often has various complexities such as coexistence of multiple mixing mechanisms,multi-stage continuous evolution,and wide and drastic changes in main control parameters.Accurately predicting the spatiotemporal evolution of mixing zone under the aforementioned complexity is crucial for engineering applications.In the current and foreseeable future,Reynolds-Averaged Navier-Stokes(RANS)and large eddy simulation(LES)modeling are the most feasible numerical methods.However,existing RANS and LES models face key challenges which must overcome,such as difficulty in uniformly predicting various mixing problems.This review will focus on these issues,standing from the perspective of engineering application,and provide a detailed overview of the latest understanding and existing problems of RANS and LES modeling among academic peers,as well as ours'recent progress.
interfacial instabilitiesturbulent mixingReynolds-averaged Navier-stokes modellarge eddy simulation model
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