HR: 0800h
AN: OS41A-0162    [Abstracts]
TI: Modeling of Fine Stratified Wake and Internal Waves Structures Past Obstacles
AU: * Bardakov, R N
EM: chakin@ipmnet.ru
AF: Institute for Problems in Mechanics of the RAS Roman N Bardakov, 101/1, prospect Vernadskogo, Moscow, 119526, Russian Federation
AU: Chashechkin, Y D
EM: chakin@ipmnet.ru
AF: Institute for Problems in Mechanics of the RAS Roman N Bardakov, 101/1, prospect Vernadskogo, Moscow, 119526, Russian Federation
AU: Mitkin, V V
EM: chakin@ipmnet.ru
AF: Institute for Problems in Mechanics of the RAS Roman N Bardakov, 101/1, prospect Vernadskogo, Moscow, 119526, Russian Federation
AB: The goal of the talk is to describe a fine flow structure formation in a continuously stratified fluid past uniformly moving obstacles basing on analytical and numerical analysis of set of fundamental governing equations and on visualization of flows by sensitive and high resolution instruments. Mathematical modeling is based on the set of fundamental governing equations including continuity, Navier-Stokes, transport of substances and the state equation with standard no-slip and no-flux boundary conditions for given particular geometry of the problem. At the first step transient diffusion induced flows on a motionless body of perfect shape (plane, cylinder or sphere) are calculated and basic components of the flow are identified. A fine structure of velocity and density fields of the diffusion-induced flow is analyzed. Flows produced by uniformly moving obstacles are calculated in linear approximation taking into account viscosity effects. Analytical calculations reveals set of regular and singular disturbed components describing internal waves, wake and upstream disturbances if a wide ranges of flow parameters. Large number of experiments with different towing bodies in stratified tanks was performed in a wide range of flow parameters. Conditions of well mutual correspondence of analytical, numerical and experimental results are defined. Formation of transverse streaky structures on obstacles and inside the wake and their transformation firstly into sequence of clusters and then into vortex systems is observed. Formation of singular soaring interfaces inside internal wave fields past 2D obstacles ad their gradual transformation into vortices is visualized. Soaring interfaces looks like infinitesimal analogues of shock waves. Due to physics of their formation soaring interfaces are acting as attractors and collectors of contaminants and producing a great impact on redistribution of concentration of diffusive clouds. Data extrapolation on the environmental conditions is discussed.
DE: 4203 Analytical modeling and laboratory experiments
DE: 4255 Numerical modeling (0545, 0560)
DE: 4524 Fine structure and microstructure
DE: 4544 Internal and inertial waves
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting