Redchyts D. Unsteady coupled problems of the dynamics of a liquid, gas, and low-temperature plasma

The dissertation is devoted to the study of unsteady processes of the dynamics of a liquid, gas, and low-temperature plasma in solving the coupled problems. The physical features of a wide class of separated flows were studied using the developed specialized package of computational aerodynamics and electrodynamics. New physically based mathematical model of the development of aerodynamics, electrodynamics, particle dynamics and chemical kinetics processes over time was developed to model the interaction features of a continuous viscous medium with plasma of a dielectric barrier discharge. The model takes into account electronically excited and metastable states of nitrogen and oxygen molecules, oxygen atoms, electrons, as well as positive and negative ions, a total of 14 particles and 97 plasma-chemical reactions, including surface processes. Modification of the Rogers-Kwak scheme for convective terms of the first and third order of accuracy is proposed. An implicit algorithm for the modified first- and third-order Rogers-Kwak scheme is constructed. The numerical study of the physical features of the turbulent flow around the J-airfoil for an arbitrary angle of attack is carried out. For the first time, the influence of the closure degree of the J-airfoil on the coefficients of drag and lift force, as well as on the flow structure around as a whole, was revealed. The dynamics and aerodynamics of the three-element airfoil 30P30N are shown when it is opened from a cruising configuration and transferred to a landing. The turbulent flow around the vehicle contour near the screen is calculated. It was established that the presence of a Savonius rotor in the central part of the vertical-axis wind turbine leads to a significant shading of the leeward portion of the trajectory of the Darrieus rotor blade and to a decrease in the generated torque. A series of computational experiments were conducted to simulate the unsteady processes of a low-temperature nonequilibrium plasma of a dielectric barrier discharge, as well as its influence on the control of the air flow structure. Parametric studies of the geometric parameters of plasma actuators and their influence on the generated air velocity are carried out. The possibility of decreasing the cylinder drag coefficient using plasma actuators by suppressing the Karman vortex street is shown.