Rough bed hydrodynamics under wave-current interactional flow field: double averaging approach

被引:0
作者
Shounda, Jayanta [1 ]
Barman, Krishnendu [1 ]
Debnath, Koustuv [2 ]
机构
[1] Vidyasagar Univ, Dept Appl Math Oceanol & Comp Programming, Midnapore, India
[2] Indian Inst Engn Sci & Technol IIEST, Dept Aerosp Engn & Appl Mech, Sibpur, India
来源
JOURNAL OF TURBULENCE | 2024年 / 25卷 / 08期
关键词
Double-average; Anisotropy; Intensity; Turbulence indicator; Roughness layer; OPEN-CHANNEL FLOW; TURBULENT-FLOW; VELOCITY DISTRIBUTIONS; OVERLAND FLOWS; STATISTICS; SURFACE; INTENSITY; ISOTROPY; STREAMS; SMOOTH;
D O I
10.1080/14685248.2024.2371824
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The effect of surface wave on the double-averaged (DA) current-only flow properties is examined over two different types of rough beds comprising hemispherical elements with regular and staggered arrangements. For each case, the relative roughness spacing of p/r = 4 is maintained, where p = pitch distance and r = hemisphere height. The changes in turbulence characteristics against the water depth are analysed for superimposed surface waves propagating along the current with 1 and 2 Hz frequencies. The effect of regular and staggered roughness arrangements on different turbulence characteristics is explored. Results demonstrate that the DA stream-wise velocity decreases and increases at the outer region and within the roughness region, respectively, due to wave propagation. Owing to the surface wave, the DA intensity and form-induced intensity increase above the roughness layer and decrease within the bottom boundary layer. The values of form-induced intensities are smaller (greater) than the DA turbulence intensities at each considered flow depth within the roughness (outer) layer. For the entire flow depth, the values of DA Reynolds stress decrease due to wave interactions along a steady current. Again, the turbulence is observed to be close to isotropic for the current-only flow at the outer zone, while the flow transits to an anisotropic state with wave imposition on current. Further, the computed values of the turbulence indicator and dispersion functions are used for the identification of the level of turbulence and dispersion at each flow depth for the locations upstream and downstream of a hemisphere in the hemispherical bed.
引用
收藏
页码:247 / 272
页数:26
相关论文
共 94 条
  • [61] Penna N., 2020, PHYS FLUIDS, V32, p055106: 114
  • [62] Response of Reynolds stresses and scaling behavior of high-order structure functions to a water-worked gravel-bed surface and its implication on sediment transport
    Penna, Nadia
    Padhi, Ellora
    Dey, Subhasish
    Gaudio, Roberto
    [J]. INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH, 2022, 37 (01) : 1 - 13
  • [63] On the influence of collinear surface waves on turbulence in smooth-bed open-channel flows
    Peruzzi, C.
    Vettori, D.
    Poggi, D.
    Blondeaux, P.
    Ridolfi, L.
    Manes, C.
    [J]. JOURNAL OF FLUID MECHANICS, 2021, 924 (924)
  • [64] Turbulent Anisotropy and Length Scale Variation Over Multiple Shaped Structure
    Raushan, Pankaj Kumar
    Singh, Santosh Kumar
    Debnath, Koustuv
    [J]. JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME, 2023, 145 (06):
  • [65] Turbulence characteristics of oscillating flow through passive grid
    Raushan, Pankaj Kumar
    Singh, Santosh Kumar
    Debnath, Koustuv
    [J]. OCEAN ENGINEERING, 2021, 224
  • [66] Spatially-averaged turbulent flow characteristics over ribbed surface in presence of unidirectional wave over steady current
    Raushan, Pankaj Kumar
    Paul, Arnov
    Singh, Santosh Kumar
    Debnath, Koustuv
    [J]. APPLIED OCEAN RESEARCH, 2020, 100
  • [67] Grid-generated turbulence in pulsating flow under the rigid boundary influence
    Raushan, Pankaj Kumar
    Singh, Santosh Kumar
    Debnath, Koustuv
    [J]. EUROPEAN JOURNAL OF MECHANICS B-FLUIDS, 2019, 78 : 291 - 305
  • [68] Open channel flow past a train of rib roughness
    Roussinova, Vesselina
    Balachandar, Ram
    [J]. JOURNAL OF TURBULENCE, 2011, 12 (28): : 1 - 17
  • [69] Distribution of turbulent eddies behind a monopile for vortex lock-on condition due to wave current combined flow
    Roy, Sayahnya
    Debnath, Koustuv
    Mazumder, Bijoy S.
    [J]. COASTAL ENGINEERING, 2018, 131 : 70 - 87
  • [70] Distribution of eddy scales for wave current combined flow
    Roy, Sayahnya
    Debnath, Koustuv
    Mazumder, Bijoy S.
    [J]. APPLIED OCEAN RESEARCH, 2017, 63 : 170 - 183