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You are here : eLibrary : IAHR World Congress Proceedings : 32nd Congress - Venice (2007) : THEME D: Maritime and Coastal Research and Engineering : Large-eddy simulation of turbulent boundary layer by steady or oscillatory current flow over flat, w...
Large-eddy simulation of turbulent boundary layer by steady or oscillatory current flow over flat, wavy or rippled bottom
Author : Athanassios Dimas, E. Balaras, D. Grigoriadis
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 or 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 othogonal grid. Results are presented for turbulent steady and oscillating boundary layers over flat, wavy or rippled bottom and 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.
File Size : 1,638,492 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 32nd Congress - Venice (2007)
Article : THEME D: Maritime and Coastal Research and Engineering
Date Published : 01/07/2007
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