☆ 4.7 Article

Direct numerical simulations of turbulent flow over the converging and diverging riblets

PHYSICS OF FLUIDS (2023)

Related references

Note: Only part of the references are listed.

Article Mechanics

Energy-based drag decomposition analyses for a turbulent channel flow developing over convergent-divergent riblets

Tongbiao Guo et al.

Summary: Direct numerical simulations were performed to investigate the influence of secondary flow motions on the drag generated by convergent-divergent (C-D) riblets in a turbulent channel flow. It was found that the intensity of the secondary flow motion increased with the wavelength of the riblets, peaking at a wavelength equal to the half channel height. The increase in drag was dominated by the turbulent kinetic energy production and viscous dissipation wake component. The work of the Reynolds shear stresses and dispersive stresses played important roles in the increase in drag at different wavelengths.

PHYSICS OF FLUIDS (2022)

Add to Collection

Article Engineering, Mechanical

Investigation of Relationship Between Flow Structures and Drag Forces on Microfin Enhanced Surfaces Using Large Eddy Simulations

Puxuan Li et al.

Summary: This study proposes a numerical model to analyze the relationship between flow structures and drag forces on a microfin enhanced surface. By using large eddy simulation (LES) and a localized, dynamic kinetic energy subgrid-scale model (LDKM), the turbulent flow structures were accurately predicted. The study verified the accuracy of the model by comparing it with a particle image velocimetry (PIV) system. The study discussed different types of drag forces and analyzed their effects on complex near-surface enhancements, also explaining why certain microfin designs are better suited for high Reynolds numbers.

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME (2022)

Add to Collection

Article Thermodynamics

Drag reduction in a turbulent boundary layer with sinusoidal riblets

Gioacchin Cafiero et al.

Summary: This study investigates the effects of sinusoidal riblets on near-wall characteristics of turbulent boundary layer. It is found that sinusoidal riblets generally achieve higher drag reduction compared to longitudinal riblets under the same conditions, with values up to 10%. This drag reduction is associated with an attenuation of turbulence intensity in the buffer layer and reduction of Reynolds shear stresses.

EXPERIMENTAL THERMAL AND FLUID SCIENCE (2022)

Add to Collection

Article Mechanics

The skin-friction coefficient of a turbulent boundary layer modified by a large-eddy break-up device

I. C. Chan et al.

Summary: A computational study was conducted to investigate skin friction modification by a large-eddy breakup device in a zero-pressure-gradient turbulent boundary layer. Wake vortices generated by the device were observed to propagate downstream towards the wall, leading to skin friction reduction. Skin friction decomposition revealed three universal regions of different changes in skin friction contributions, with the formation and dissipation of wake vortices playing key roles in the reduction process.

PHYSICS OF FLUIDS (2021)

Add to Collection

Article Mechanics

Drag reduction and transient growth of a streak in a spanwise wall-oscillatory turbulent channel flow

A. Yakeno

Summary: This study investigated the drag-reduction mechanism of spanwise wall oscillation in a turbulent channel, finding that oscillation affected the optimal energy growth of streak modes and enhanced the growth of tilted-streak modes under longer oscillation periods. The transition of optimal perturbations under oscillation showed that spanwise Stokes layer shear played a more significant role in modification than the spanwise velocity did. A new drag-reduction performance estimation model was proposed based on streak formation modification under oscillation, which restrained energy transfer to streamwise vortices via a tilting delay.

PHYSICS OF FLUIDS (2021)

Add to Collection

Article Mechanics

Energetic structures in the turbulent boundary layer over a spanwise-heterogeneous converging/diverging riblets wall

Honglei Bai et al.

Summary: Time-invariant secondary flows have been observed in turbulent boundary layer flows over spanwise-heterogeneous rough walls, connected with instantaneous large-scale structures. Proper orthogonal decomposition (POD) technique was used to extract dominant energetic structures, revealing significant effects on velocity spatial correlations and Reynolds stress distributions.

PHYSICS OF FLUIDS (2021)

Add to Collection

Article Engineering, Aerospace

Turbulence statistics of flow over a drag-reducing and a drag-increasing riblet-mounted surface

Weipeng Li

AEROSPACE SCIENCE AND TECHNOLOGY (2020)

Add to Collection

Article Mechanics

Experimental study on secondary flow in turbulent boundary layer over spanwise heterogeneous microgrooves

Fang Xu et al.

PHYSICS OF FLUIDS (2020)

Add to Collection

Article Mechanics

Statistical analysis of vortical structures in turbulent boundary layer over directional grooved surface pattern with spanwise heterogeneity

Fang Xu et al.

PHYSICS OF FLUIDS (2019)

Add to Collection

Article Mechanics

Turbulent structures in a statistically three-dimensional boundary layer

Kevin et al.

JOURNAL OF FLUID MECHANICS (2019)

Add to Collection

Article Engineering, Mechanical

Two-point statistics of coherent structures in turbulent flow over riblet-mounted surfaces

Weipeng Li et al.

ACTA MECHANICA SINICA (2019)

Add to Collection

Article Physics, Multidisciplinary

Influence of sinusoidal riblets on the coherent structures in turbulent boundary layer studied by time-resolved particle image velocimetry

Li Shan et al.

ACTA PHYSICA SINICA (2019)

Add to Collection

Article Mechanics

Turbulence modifications in a turbulent boundary layer over a rough wall with spanwise-alternating roughness strips

H. L. Bai et al.

PHYSICS OF FLUIDS (2018)

Add to Collection

Article Engineering, Aerospace

Active and Passive Turbulent Boundary-Layer Drag Reduction

Thomas C. Corke et al.

AIAA JOURNAL (2018)

Add to Collection

Article Mechanics

Effect of active control on linear transient growth in turbulent channel flow

Yang Song et al.

JOURNAL OF TURBULENCE (2017)

Add to Collection

Article Mechanics

Drag reduction by herringbone riblet texture in direct numerical simulations of turbulent channel flow

H. O. G. Benschop et al.

JOURNAL OF TURBULENCE (2017)

Add to Collection

Article Mechanics

Cross -stream stereoscopic particle image velocimetry of a modified turbulent boundary layer over directional surface pattern

Kevin et al.

JOURNAL OF FLUID MECHANICS (2017)

Add to Collection

Article Computer Science, Interdisciplinary Applications

Nektar plus plus : An open-source spectral/hp element framework

C. D. Cantwell et al.

COMPUTER PHYSICS COMMUNICATIONS (2015)

Add to Collection

Article Mechanics

On the mechanism of turbulent drag reduction with super-hydrophobic surfaces

Amirreza Rastegari et al.

JOURNAL OF FLUID MECHANICS (2015)

Add to Collection

Article Mechanics

Numerical and experimental study of mechanisms responsible for turbulent secondary flows in boundary layer flows over spanwise heterogeneous roughness

William Anderson et al.

JOURNAL OF FLUID MECHANICS (2015)

Add to Collection

Article Engineering, Mechanical

Flow over bio-inspired 3D herringbone wall riblets

Huawei Chen et al.

EXPERIMENTS IN FLUIDS (2014)

Add to Collection

Article Thermodynamics

Large-scale spanwise periodicity in a turbulent boundary layer induced by highly ordered and directional surface roughness

B. Nugroho et al.

INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW (2013)

Add to Collection

Article Mechanics

Wall-bounded turbulent flows at high Reynolds numbers: Recent advances and key issues

I. Marusic et al.

PHYSICS OF FLUIDS (2010)

Add to Collection

Article Mechanics

Mechanics and Prediction of Turbulent Drag Reduction with Polymer Additives

Christopher M. White et al.

Annual Review of Fluid Mechanics (2008)

Add to Collection

Article Water Resources

Time-mean structure of secondary flows in open channel with longitudinal bedforms

Zhi-Qian Wang et al.

ADVANCES IN WATER RESOURCES (2006)

Add to Collection

Article Mechanics

Spanwise structure and scale growth in turbulent boundary layers

CD Tomkins et al.

JOURNAL OF FLUID MECHANICS (2003)

Add to Collection

Article Mechanics

Characteristics of vortex packets in turbulent boundary layers

B Ganapathisubramani et al.

JOURNAL OF FLUID MECHANICS (2003)

Add to Collection

Letter Mechanics

Contribution of Reynolds stress distribution to the skin friction in wall-bounded flows

K Fukagata et al.

PHYSICS OF FLUIDS (2002)

Add to Collection

Article Engineering, Mechanical

Flow over convergent and divergent wall riblets

K Koeltzsch et al.

EXPERIMENTS IN FLUIDS (2002)

Add to Collection

Article Engineering, Mechanical

Flow field analysis of a turbulent boundary layer over a riblet surface

SJ Lee et al.

EXPERIMENTS IN FLUIDS (2001)

Add to Collection

Article Mechanics

Active wall motions for skin-friction drag reduction

S Kang et al.

PHYSICS OF FLUIDS (2000)

Add to Collection

© Peeref 2019-2024. All rights reserved.