Interface-resolved direct numerical simulations of sediment transport in a turbulent oscillatory boundary layer

  title={Interface-resolved direct numerical simulations of sediment transport in a turbulent oscillatory boundary layer},
  author={Marco Mazzuoli and Paolo Blondeaux and Giovanna Vittori and Markus Uhlmann and Julian A. Simeonov and Joseph Calantoni},
  journal={Journal of Fluid Mechanics},
The flow within an oscillatory boundary layer, which approximates the flow generated by propagating sea waves of small amplitude close to the bottom, is simulated numerically by integrating the Navier–Stokes and continuity equations. The bottom is made up of spherical particles, free to move, which mimic sediment grains. The approach allows one to fully resolve the flow around the particles and to evaluate the forces and torques that the fluid exerts on their surface. Then, the dynamics of… 
Sediment transport under oscillatory flows
The role of bed-penetrating Kelvin–Helmholtz vortices on local and instantaneous bedload sediment transport
Abstract We present results from open-channel, Euler–Lagrange (EL) simulations of turbulent flow over an erodible particle bed at a shear Reynolds number of $Re_{\tau }=180$. Upon space and time
On the stability of the boundary layer at the bottom of propagating surface waves
Abstract This study contributes to an improved understanding of the stability of the boundary layer generated at the bottom of a propagating surface wave of small but finite amplitude such that both
Large Eddy Simulation of particle-laden flow over dunes
Mean flow structure and velocity–bed shear stress maxima phase difference in smooth wall, transitionally turbulent oscillatory boundary layers: direct numerical simulations
Abstract Direct numerical simulations of oscillatory boundary-layer flows in the transitional regime were performed to explain discrepancies in the literature regarding the phase difference ${\rm
Open-channel flow over evolving subaqueous ripples
Abstract We have numerically investigated the turbulent flow and sediment grain motion in an open-channel flow configuration over a subaqueous sediment bed featuring two-dimensional transverse
Nonlinear variation of bedload thickness with fluid flow rate in laminar shearing flow
Themovement of subaqueous sediment in laminar shearing flow is numerically investigated by the coupled lattice Boltzmann and discrete element methods. First, the numerical method is validated by
Response of Flow and Saltating Particle Characteristics to Bed Roughness and Particle Spatial Density
With the goal to explore the effects of natural bed roughness on bedload transport, numerical simulations of flow and particle saltation are carried out with varying bed roughness and particle


Sediment suspension due to waves
[1] A simulation of the turbulent flow and sediment dynamics in the boundary layer originated close to the seabed by a first-order Stokes wave is performed. The flow field is obtained by the
DNS study of particle-bed–turbulence interactions in an oscillatory wall-bounded flow
Particle-resolved direct numerical simulations (DNS) are performed to investigate the behaviour of an oscillatory flow field over a rough bed, corresponding to the experimental set-up of Keiller &
On the formation of sediment chains in an oscillatory boundary layer
The dynamics of spherical particles resting on a horizontal wall and set into motion by an oscillatory flow is investigated by means of a fully coupled model. Both a smooth wall and a rough wall, the
Coherent structures in oscillatory boundary layers
The dynamics of the vortex structures appearing in an oscillatory boundary layer (Stokes boundary layer), when the flow departs from the laminar regime, is investigated by means of flow
Interface-resolved direct numerical simulation of vertical particulate channel flow in the turbulent regime
We have conducted a direct numerical simulation study of dilute turbulent particulate flow in a vertical plane channel by considering thousands of finite-size rigid particles with resolved phase
Direct numerical simulation of pattern formation in subaqueous sediment
Abstract We present results of direct numerical simulation of incompressible fluid flow over a thick bed of mobile spherically shaped particles. The algorithm is based upon the immersed-boundary
Direct numerical simulations of transition and turbulence in smooth-walled Stokes boundary layer
Stokes boundary layer (SBL) is a time-periodic canonical flow that has several environmental, industrial, and physiological applications. Understanding the hydrodynamic instability and turbulence in
Direct simulation of transition in an oscillatory boundary layer
Numerical simulations of Navier–Stokes equations are performed to study the flow originated by an oscillating pressure gradient close to a wall characterized by small imperfections. The scenario of