Coupling of NWT and large-eddy simulation for wave-induced sediment transport
Date of Original Version
We present the validation and application of a numerical model for the simulation of wave-induced sediment transport. Our approach is a oneway coupling of an inviscid flow model (i.e., a Numerical Wave Tank based on potential flow theory; NWT) to a Navier-Stokes solver, to simulate near bottom wave-induced turbulent boundary layer flows. Only two-dimensional incident wave fields have been considered so far (i.e., long-crested swells), while the near-field wave-induced turbulent flow and sediment transport are fully three-dimensional. Good results are obtained for steady streaming velocities when applying open boundary conditions (i.e., zero velocity gradient), a quarter-wavelength from the edge of the domain without the assumption of periodicity. For turbulent test cases, we solve the Navier-Stokes equations using a large-eddy simulation using an approximate (log-layer) wall boundary condition and a dynamic Smagorinsky subgrid scale model. After validating the model hydrodynamic predictions, we simulate wave-induced sediment transport over an idealized rippled bed, and find reasonable agreement with laboratory results for oscillatory flows over full-scale sand ripples. Both idealized and more realistic test cases are presented. © 2010 by The International Society of Offshore and Polar Engineers (ISOPE).
Proceedings of the International Offshore and Polar Engineering Conference
Harris, Jeffrey C., and Stéphan T. Grilli. "Coupling of NWT and large-eddy simulation for wave-induced sediment transport." Proceedings of the International Offshore and Polar Engineering Conference 3, (2010): 578-585. https://digitalcommons.uri.edu/oce_facpubs/153