Journal of Fluid Mechanics
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Structure of the Reynolds stress near the wallExperimental studies of the flow field near the wall in a turbulent boundary layer using hot-wire probes are reported. Measurements of the productuv are studied using the technique of conditional sampling with a large digital computer to single out special events (bursting) when large contributions to turbulent energy and Reynolds stress occur. The criterion used ... ...
Journal of Fluid Mechanics - Tập 55 Số 1 - Trang 65-92 - 1972
Bubble plumes in stratified environmentsThis paper is concerned with the behaviour of buoyant plumes driven by a source of bubbles. It is shown experimentally that, when a bubble plume rises through a stratified environment, fluid can be transported vertically for some distance and then some of this fluid can leave the plume and spread out horizontally at its own density level. A simple plume model which regards the plume as a s... ...
Journal of Fluid Mechanics - Tập 85 Số 4 - Trang 655-672 - 1978
Similarity and structure of wall turbulence with lateral wall shear stress variationsWall-bounded turbulence, where it occurs in engineering or nature, is commonly subjected to spatial variations in wall shear stress. A prime example is spatially varying roughness. Here, we investigate the configuration where the wall shear stress varies only in the lateral direction. The investigation is idealised in order to focus on one aspect, namely, the similarity and structure of tu... ...
Journal of Fluid Mechanics - Tập 847 - Trang 591-613 - 2018
Reorganisation of turbulence by large and spanwise-varying ribletsWe study the flow above non-optimal riblets, specifically large drag-increasing and two-scale trapezoidal riblets. In order to reach large Reynolds numbers and large scale separation while retaining access to flow details, we employ a combination of boundary-layer hot-wire measurements and direct numerical simulation (DNS) in minimal-span channels. Although the outer Reynolds numbers diffe... ...
Journal of Fluid Mechanics - Tập 952 - 2022
Channel flow with large longitudinal ribsAbstract
Journal of Fluid Mechanics - Tập 915 - 2021
Effects of spanwise spacing on large-scale secondary flows in rough-wall turbulent boundary layersLarge-scale secondary flows can sometimes appear in turbulent boundary layers formed over rough surfaces, creating low- and high-momentum pathways along the surface (Barros & Christensen, J. Fluid Mech. , vol. 748, 2014, R1). We investigate experimentally the dependence of these secondary flows on surface/flow conditions by measuring the flows over streamwise ... ...
Journal of Fluid Mechanics - Tập 774 - 2015
The autonomous cycle of near-wall turbulenceNumerical experiments on modified turbulent channels at moderate Reynolds numbers
are used to differentiate between several possible regeneration cycles for the
turbulent fluctuations in wall-bounded flows. It is shown that a cycle exists which is
local to the near-wall region and does not depend on the outer flow. It involves the
formation of velocity streaks from the advection of the... ...
Journal of Fluid Mechanics - Tập 389 - Trang 335-359 - 1999
Secondary flow induced by ribletsThe effects of riblets on one wall of a channel bounding fully
developed turbulent
flow are investigated. Various perturbation elements including wires, fins
and slots are
modelled in order to understand the effects of riblets. It is found that
widely spaced
riblets, fins and wires create a substantial increase in turbulent activity
just above the
element. These elements are also f... ...
Journal of Fluid Mechanics - Tập 363 - Trang 115-151 - 1998
Turbulence and secondary motions in square duct flowWe study turbulent flows in pressure-driven ducts with square cross-section through direct numerical simulation in a wide enough range of Reynolds number to reach flow conditions which are representative of fully developed turbulence ($Re_{\unicode[STIX]{x1D70F}}\approx 1000$ hiện toàn bộ
Journal of Fluid Mechanics - Tập 840 - Trang 631-655 - 2018
Turbulent boundary-layer flow over regular multiscale roughnessAbstract
Journal of Fluid Mechanics - Tập 917 - 2021
Tổng số: 636
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