Investigation of alternative drag-reduction strategies in turbulent boundary layers by using wall forcing

使用壁力研究湍流边界层中的替代减阻策略

• 批准号: EP/G061556/1
• 负责人: Michael Leschziner
• 金额: $ 43.6万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2009
• 资助国家: 英国
• 起止时间: 2009 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FG061556%2F1
• 关键词: Investigation; alternative; drag; reduction; strategies

The aim of this research is to investigate, in an interactive programme involving several mutually supportive computational approaches and paradigms, the feasibility of achieving sustained and economically worthwhile frictional-drag reduction at flight Reynolds numbers using cross-flow wall forcing. While the emphasis of the programme is on the fundamental turbulence physics and the prediction of its interaction with wall drag, in general, the programme is closely associated with an important civil aviation goal, namely the reduction in emissions per passenger km by 50% by 2020. The programme will combine studies involving direct numerical simulations and highly-resolved large eddy simulations with two approaches based on linearised streak modelling, one developed by Chernyshenko (Imperial College) and the other by Lockerby (Warwick). The general strategy is to use the full-resolution schemes to gain insight into the near-wall turbulence mechanisms associated with frictional drag, to generate calibration-related input into the linearised streak modelling and to investigate the validity of this modelling for a range of actuation parameters examined with the full-resolution approaches. The proposed research is fundamental in nature and complements well EPSRC's Active Aircraft programme, which is practically-oriented. The ultimate objective is to derive a prediction procedure, based on linearised streak modelling that allows the effect of different configurations of cross-flow wall forcing on drag at flight Reynolds numbers to be quantified. The programme is financially supported by EADS.

本研究的目的是调查，在一个互动的程序，涉及几个相互支持的计算方法和范例，实现持续的和经济上有价值的摩擦阻力减少在飞行雷诺数使用横流壁强迫的可行性。虽然该计划的重点是基本湍流物理学及其与壁阻力相互作用的预测，但总体而言，该计划与一个重要的民用航空目标密切相关，即到2020年将每名乘客公里的排放量减少50%。该方案将把联合收割机的研究，包括直接数值模拟和高分辨率大涡模拟与两种基于线性条纹模型的方法相结合，一种是由Chernyshenko（帝国理工学院）开发的，另一种是由Lockerby（沃里克）开发的。一般的策略是使用全分辨率方案来深入了解与摩擦阻力相关的近壁湍流机制，生成与校准相关的线性化条纹建模输入，并研究全分辨率方法检查的一系列驱动参数的有效性。拟议的研究是基本的性质，并补充了EPSRC的主动飞机计划，这是面向实际的。最终的目标是推导出一个预测程序，基于线性化条纹模型，该模型允许在飞行雷诺数下对阻力施加横流壁面作用力的不同配置的影响进行量化。该方案由埃兹公司提供财政支助。

项目成果

Linearised Navier-Stokes equations and near-wall streaks in turbulent flow subject to drag reduction by wall oscillations

线性纳维-斯托克斯方程和湍流中的近壁条纹受到壁振荡减阻的影响

• 发表时间: 2013
• 作者: Blesbois Olivier

Skewness-induced asymmetric modulation of small-scale turbulence by large-scale structures

• DOI: 10.1063/1.4939718
• 发表时间: 2016-01-01
• 期刊: PHYSICS OF FLUIDS
• 影响因子: 4.6
• 作者: Agostini, Lionel;Leschziner, Michael;Gaitonde, Datta
• 通讯作者: Gaitonde, Datta

On the influence of outer large-scale structures on near-wall turbulence in channel flow

• DOI: 10.1063/1.4890745
• 发表时间: 2014-07
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: L. Agostini;M. Leschziner

The turbulence vorticity as a window to the physics of friction-drag reduction by oscillatory wall motion

• DOI: 10.1016/j.ijheatfluidflow.2014.08.002
• 发表时间: 2015-02
• 期刊: International Journal of Heat and Fluid Flow
• 影响因子: 2.6
• 作者: L. Agostini;E. Touber;M. Leschziner

A large-scale filter for applications of QSQH theory of scale interactions in near-wall turbulence

近壁湍流中尺度相互作用 QSQH 理论应用的大型滤波器

• DOI: 10.1088/1873-7005/aacf80
• 发表时间: 2019
• 期刊: Fluid Dynamics Research
• 影响因子: 1.5
• 作者: Chernyshenko S