The Structure of Turbulence and Other Motions Beneath an Air-Water Interface
Final rept. 1 Nov 93-31 May 97
STANFORD UNIV CA ENVIRONMENTAL FLUID MECHANICS LAB
Pagination or Media Count:
ONR Grant N00014-94-0190, The structure of turbulence and other motions beneath an air-water interface had a performance period from 110193 to 053197. Both physical experiments and numerical simulation experiments were used to study three-dimensional, unsteady, real fluid flows beneath the air-water interface. The goals were to develop 1 an understanding of the flow physics, and 2 a numerical simulation tool that allows accurate prediction of the motion from a specified set of initial conditions. This report summarizes our progress and cites the relevant references. The focus of the numerical work was the kinematics of the interaction between surface waves and a turbulent current. The numerical method produces a time-accurate simulation of an unsteady turbulent free-surface flow in three space dimensions. The simulations are large-eddy simulations LES, employing a dynamic two-parameter model, new treatment of the kinematic boundary condition in mapped space, and a moving boundary fitted grid. A method of domain decomposition to enhance near surface resolution was also demonstrated.
- Physical and Dynamic Oceanography
- Fluid Mechanics