Ilchenko V. Dynamic of the mixed patches and simulation of the recording process by schlieren method

The object is weak density inhomogeneities in stratified fluid. The aim is analysis of features of evolution of mixed patches in stratified medium and simulation of the recording process of mixed patches by schlieren system. The methods are development of physical and mathematical models of mixed patches appropriate different stuges of evolution; construction of the mathematical model of the schlieren system; numerical simulation of the shadow images. New model of mixed region evolving on initial stage has been developed. This model considered external motions, resulting of collapse of mixed region. Decaying of turbulence in mixed region being on transition stage of turbulent regime is studied. Two classes of models of inhomogeneity models appropriate to real water medium conditions have been constructed. Mathematical model describing the intesity distribution in the observation plane of schlieren system (schlieren image) in linear approximation when weak small-scaled transparent inhomogeneities are investigated have been developed. Simulation of the recording process of transparent inhomogeneities by schlieren system have been performed. Schlieren shadow images of periodically structures, local inhomogeneities and inhomogeneity ensambles are presented. The field is mechanics of inhomogeneities fluids