### Abstract

Language | English |
---|---|

Journal | Environmental Fluid Mechanics |

DOIs | |

State | E-pub ahead of print - 23 Feb 2019 |

### Fingerprint

### Cite this

}

**Effect of the water depth on oscillatory flows over a flat plate: from the intermittent towards the fully turbulent regime.** / Kaptein, S.J. (Corresponding author); Duran Matute, M.; Roman, Federico; Armenio, V.; Clercx, H.J.H.

Research output: Contribution to journal › Article › Academic › peer-review

TY - JOUR

T1 - Effect of the water depth on oscillatory flows over a flat plate: from the intermittent towards the fully turbulent regime

AU - Kaptein,S.J.

AU - Duran Matute,M.

AU - Roman,Federico

AU - Armenio,V.

AU - Clercx,H.J.H.

PY - 2019/2/23

Y1 - 2019/2/23

N2 - We performed high-resolution numerical simulations of a turbulent flow driven by an oscillating uniform pressure gradient. The purpose was to investigate the influence of a reduced water depth H on the structure and dynamics of the turbulent boundary layer and the transition towards a fully turbulent flow. The study is motivated by applications of oscillatory flows, such as tides, in which H is of the same order of magnitude as the thickness of the turbulent boundary layer. It was found that, if H ~ delta, the turbulent flow is characterized by (i) an increase of the magnitude of the surface velocity, (ii) an increase in the magnitude of the wall shear stress and (iii) a phase lead of the velocity profiles, all with respect to the reference case for which H>>delta. These results are in agreement with analytical solutions for a laminar oscillatory flow. Nevertheless, if the value of the Reynolds numbers is too small and H ~ delta, the flow relaminarizes.

AB - We performed high-resolution numerical simulations of a turbulent flow driven by an oscillating uniform pressure gradient. The purpose was to investigate the influence of a reduced water depth H on the structure and dynamics of the turbulent boundary layer and the transition towards a fully turbulent flow. The study is motivated by applications of oscillatory flows, such as tides, in which H is of the same order of magnitude as the thickness of the turbulent boundary layer. It was found that, if H ~ delta, the turbulent flow is characterized by (i) an increase of the magnitude of the surface velocity, (ii) an increase in the magnitude of the wall shear stress and (iii) a phase lead of the velocity profiles, all with respect to the reference case for which H>>delta. These results are in agreement with analytical solutions for a laminar oscillatory flow. Nevertheless, if the value of the Reynolds numbers is too small and H ~ delta, the flow relaminarizes.

U2 - 10.1007/s10652-019-09671-3

DO - 10.1007/s10652-019-09671-3

M3 - Article

JO - Environmental Fluid Mechanics

T2 - Environmental Fluid Mechanics

JF - Environmental Fluid Mechanics

SN - 1567-7419

ER -