RESEARCH DEPARTMENT OF THE INFORMATION SYSTEMS IN HYDROAEROMECHANICS AND ECOLOGY

 FROM THE HISTORY OF DEPARTMENT

The Department was established in 2000 on the basis of a Laboratory of Fluid Dynamics of Separated Flows (the Department of Flows with Free Boundaries). In 1987, it was led by Dr. A. I. Tsyganyuk (in 1987–1989 the Laboratory was a part of the Department of Hydrobionics and Boundary Layer Control). For a long time the department was headed by a Corresponding Member of NAS of Ukraine, Doctor of Physical and Mathematical Sciences Professor S. O. Dovgiy. Currently, one Doctor of Sciences (V.V. Moroz, Head of the Department) and six Candidateds (PhDs) work in this Institute’s division.

MAIN RESEARCH DIRECTIONS

• transient hydroaerodynamics of wing propeller, studying of the boundary layer and near-wall flows in the vicinity of curved surfaces;
• calculation of the non-linear time-dependent characteristics of a finite- span wing, three-dimensional flow around the bodies of complex configuration;
• mathematical modeling of mass transfer phenomena in geophysical environments;
• boundary layer control by injection or suction of a liquid;
• hydrobionic experimental studying of kinematics and hydrodynamics of fin propulsion of marine animals, followed by its technical simulations on specially designed equipment;
• theoretical and experimental study of the effect of non-stationary processes on the aerodynamic characteristics of vertical and horizontal-axis wind turbine rotors;
• studying of flows in porous surfaces and curved wall jet of an incompressible fluid;
• creation of GIS modeling of man-made pollution on the basis of operative meteorological forecasts, taking into account the terrain and atmospheric stratification.

BASICRESEARCHAND APPLIEDRESULTS

• the fundamental results on physical mechanisms of hydro-aerodynamics forces with fluctuations wings are obtained, techniques for small hydrodynamic turbulence visualization are developed and pictures of sequential vortices development and destruction in the wake are obtained for a single oscillating wing and wing system;
• the allowance for the non-linear deformation of the vortex surface trailing from the body is shown to provide the correct modeling of the non-stationary effects associated with the phase shift of the hydro-aerodynamic forces and change of amplitude values; also the evaluation of a contribution of inertial forces of the circulation and vortex nature becomes possible, as well as explanation of the mechanism of creation of the resulting hydro-aerodynamics forces for the different vibration regimes;
• oscillation regimes are investigated for the "biplane" and "tandem" wing systems near the solid walls, in the channel for separated and unseparated flow, including the effect of the boundary layer suction and the ejection at the surface;
• the methods for calculation of the integral characteristics of the boundary layer are developed for the cases of presence of a distributed suction or injection of a homogeneous fluid, the non-Newtonian fluid supply to the boundary layer, as well as methods of combined boundary layer control by injection and suction of the fluid;
• in the area of numerical methods for solving of singular integral equations with the initial data intended for solution of time-dependent problems, the improvements of the discrete vortex method are designed that provide the satisfactory convergence for any non-steadiness degree;
• the methods for solving of nonlinear time-dependent problems of the wing theory were applied to problems of hydro-aviation-related take-off and landing on water surface;
• the methods for optimizing the characteristics of fin propulsion are proposed;
• on the basis of GIS technology, an "Informchernobyl" system is developed, as well as a number of monitoring and control systems for studying of environmental disasters, systems for environment protection and investigation of natural resources, decision support systems based on mathematical modeling and expert assessments;
• a model rotor wind turbine with three rectangular blades oscillating during the rotation has been designed, manufactured and tested in the Institute’s hydrodynamic tray; the effective ways and schemes for improving of the hydrodynamic characteristics of oscillating blades and power characteristics of the rotor have been studied.

Based on the results of the complex researches, a number of technical solutions was proposed for practical use of the oscillating wings and wing systems in aircraft- and shipbuilding. The employees of the Department have received over 60 domestic and international patents for inventions.