Author(s): Grigoriadis Dimokratis; Dimas Athanassios; Balaras Elias
Linked Author(s):
Keywords: Current-Wave Boundary Layer; Oscillating Boundary Layer; Wavy Wall; Bottom Ripples; Turbulence; Large-Eddy Simulation; Immersed Boundary Method
Abstract: Large-eddy simulation (LES) of turbulent boundary layer developing by a steady or an oscillatory current over flat, Wavy or rippled bottom are presented. These flows represent prototype turbulent flows of current-wave interactions in the coastal zone. The numerical method is based on a time—splitting scheme for the temporal discretization and a finite-differences approximation on orthogonal grid for the spatial discretization. The immersed boundary (IMB) method is utilized to represent complex boundary shapes, i. e., the Wavy or rippled bottom, on the orthogonal grid. Results are presented for turbulent steady and oscillating boundary layers over flat, Wavy or rippled bottom and are compared to available experimental measurements and results of direct numerical simulations. The comparisons confirm the LES capability for accurate flow predictions Without any special model calibration and the IMB usability Where geometric complexity does not lead to increased computational cost.
Year: 2007