Identity of attached eddies in turbulent channel flows with bidimensional empirical mode decomposition [0.03%]
基于二维本征模态分解的壁湍流附体涡识别研究
Cheng Cheng,Weipeng Li,Adrián Lozano-Durán et al.
Cheng Cheng et al.
Bidimensional empirical mode decomposition (BEMD) is used to identify attached eddies in turbulent channel flows and quantify their relationship with the mean skin-friction drag generation. BEMD is an adaptive, non-intrusive, data-driven me...
Adrián Lozano-Durán,Hyunji Jane Bae
Adrián Lozano-Durán
Townsend (The Structure of Turbulent Shear Flow, 1976, Cambridge University Press) proposed a structural model for the logarithmic layer (log layer) of wall turbulence at high Reynolds numbers, where the dominant momentum-carrying motions a...
Hyunji Jane Bae,Adrián Lozano-Durán,Sanjeeb T Bose et al.
Hyunji Jane Bae et al.
Wall modelling in large-eddy simulation (LES) is necessary to overcome the prohibitive near-wall resolution requirements in high-Reynolds-number turbulent flows. Most existing wall models rely on assumptions about the state of the boundary ...
A hierarchical random additive model for passive scalars in wall-bounded flows at high Reynolds numbers [0.03%]
高雷诺数壁湍流中被动标量的层次随机模型研究
Xiang I A Yang,Mahdi Abkar
Xiang I A Yang
The kinematics of a fully developed passive scalar is modelled using the hierarchical random additive process (HRAP) formalism. Here, 'a fully developed passive scalar' refers to a scalar field whose instantaneous fluctuations are statistic...
A multifractal model for the momentum transfer process in wall-bounded flows [0.03%]
壁湍流动量传递的多重分形模型研究
X I A Yang,A Lozano-Durán
X I A Yang
The cascading process of turbulent kinetic energy from large-scale fluid motions to small-scale and lesser-scale fluid motions in isotropic turbulence may be modelled as a hierarchical random multiplicative process according to the multifra...
Kazuki Maeda,Tim Colonius
Kazuki Maeda
The dynamics of bubble clouds induced by high-intensity focused ultrasound are investigated in a regime where the cloud size is similar to the ultrasound wavelength. High-speed images show that the cloud is asymmetrical; the bubbles nearest...
Mitchell Bushuk,David M Holland,Timothy P Stanton et al.
Mitchell Bushuk et al.
Ice scallops are a small-scale (5-20cm) quasi-periodic ripple pattern that occurs at the ice-water interface. Previous work has suggested that scallops form due to a self-reinforcing interaction between an evolving ice-surface geometry, an ...
Upstream vortex and elastic wave in the viscoelastic flow around a confined cylinder [0.03%]
粘弹性圆柱绕流中的上游涡旋和弹性波
Boyang Qin,Paul F Salipante,Steven D Hudson et al.
Boyang Qin et al.
The viscoelastic flow past a cylinder is a classic benchmark problem that is not completely understood. Using novel 3D holographic particle velocimetry, we report three main discoveries of the elastic instability upstream of a single cylind...
Dries Allaerts,Johan Meyers
Dries Allaerts
Flow blockage by large wind farms leads to an upward displacement of the boundary layer, which may excite atmospheric gravity waves in the free atmosphere aloft and on the interface between the boundary layer and the free atmosphere. In the...
Velocity and acceleration statistics in rapidly rotating Rayleigh-Bénard convection [0.03%]
快速旋转瑞利-贝纳尔对流中的速度和加速度统计学特征研究
Hadi Rajaei,Kim M J Alards,Rudie P J Kunnen et al.
Hadi Rajaei et al.
Background rotation causes different flow structures and heat transfer efficiencies in Rayleigh-Bénard convection (RBC). Three main regimes are known: rotation-unaffected, rotation-affected and rotation-dominated. It has been shown that th...