Title :
Direct Phase-Resolved Simulations of Large-Scale Nonlinear Ocean Wave-Fields
Author :
Wu, Guangyu ; Liu, Yuming ; Yue, Dick K P
Author_Institution :
Dept. of Mech. Eng., Massachusetts Inst. of Technol., Cambridge, MA
Abstract :
We develop and apply a direct phase-resolved simulation capability for large-scale nonlinear ocean wavefield evolution. Unlike phase-averaged models, we directly solve the primitive Euler equation and preserve the phase of the wavefield during its nonlinear evolution. As a result, detailed descriptions of the free surface elevation and the kinematics of the wavefield are obtained. Using the direct simulation capability, we investigate the validity and limitations of existing approximate theories and models for the prediction of ocean surface wave statistics under different physical parameters. In particular, with 256 processors on the ERDC Cray XT3, we directly compute the nonlinear evolution of a short-crested (three-dimensional) wavefield in a domain of 28.7kmtimes28.7km with evolution time up to 30 minutes, and analyze the occurrence statistics and spatial distribution of rogue waves in the wavefield. The effects of spectral bandwidth and angular spreading on wave statistics are investigated
Keywords :
geophysics computing; ocean waves; oceanographic techniques; 3D wavefield; ERDC Cray XT3; angular spreading; direct phase-resolved simulations; direct simulation; free surface elevation; large-scale nonlinear ocean wave-fields; occurrence statistics; ocean surface wave statistics prediction; primitive Euler equation; rogue waves; short-crested wavefield; spatial distribution; spectral bandwidth; wavefield kinematics; Computational modeling; Distributed computing; Kinematics; Large-scale systems; Nonlinear equations; Oceans; Predictive models; Sea surface; Statistical distributions; Surface waves;
Conference_Titel :
HPCMP Users Group Conference, 2006
Conference_Location :
Denver, CO
Print_ISBN :
0-7695-2797-3
DOI :
10.1109/HPCMP-UGC.2006.19
