Contributions of different scales of turbulent motions to the mean wall-shear stress in open channel flows at low-to-moderate Reynolds numbers

Y Duan, Q Zhong, G Wang, P Zhang… - Journal of Fluid …, 2021‏ - cambridge.org
Smooth-walled open channel flow datasets, covering both the direct numerical simulation
and experimental measurements with a friction Reynolds number wavelength ranges are …

On the enhancement of boundary layer skin friction by turbulence: an angular momentum approach

A Elnahhas, PL Johnson - Journal of Fluid Mechanics, 2022‏ - cambridge.org
Turbulence enhances the wall shear stress in boundary layers, significantly increasing the
drag on streamlined bodies. Other flow features such as free stream pressure gradients and …

Integral relations for the skin-friction coefficient of canonical flows

P Ricco, M Skote - Journal of Fluid Mechanics, 2022‏ - cambridge.org
We show that the Fukagata et al.'s (Phys. Fluids, vol. 14, no. 11, 2002, pp. 73–76) identity for
free-stream boundary layers simplifies to the von Kármán momentum integral equation …

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

IC Chan, R Örlü, P Schlatter, RC Chin - Physics of Fluids, 2021‏ - pubs.aip.org
A computational study based on well-resolved large-eddy simulations is performed to study
the skin friction modification by a large-eddy breakup device (LEBU) in a zero-pressure …

[HTML][HTML] Role of elasto-inertial turbulence in viscoelastic drag-reducing turbulence

WH Zhang, HN Zhang, YK Li, B Yu, FC Li - Physics of Fluids, 2021‏ - pubs.aip.org
Two kinds of nonlinearities coexist in viscoelastic fluid flows, ie, inertia and elasticity, which
can engender different types of chaotic states including inertial turbulence (IT), drag …

On the role of tensor interpolation in solving high-Wi viscoelastic fluid flow

H Zhang, W Zhang, X Wang, Y Li, X Li, F Li - Physics of Fluids, 2023‏ - pubs.aip.org
The high Weissenberg number (Wi) problem (HWNP) has long been a challenge of
viscoelastic fluid flow simulation. This Letter points out that the tensor interpolation method …

[HTML][HTML] Molecular insight into the possible mechanism of drag reduction of surfactant aqueous solution in pipe flow

Y Kobayashi, H Gomyo, N Arai - International journal of molecular …, 2021‏ - mdpi.com
The phenomenon of drag reduction (known as the “Toms effect”) has many industrial and
engineering applications, but a definitive molecular-level theory has not yet been …

Electrohydrodynamic conduction pum** of viscoelastic dielectric liquids on the microscale

DL Chen, CT Zhou, Y Zhang, K Luo, HL Yi - Acta Mechanica Sinica, 2024‏ - Springer
Electrohydrodynamic (EHD) conduction pum** can be applied in many macroscopic
devices accompanied by a high electric field intensity (106 V/m). Microscale flow generation …