In a real fluid flow (air or water), the particle velocity is not constant but varies over time. When an object interacts with a fluid, a motion is created that can be more or less effective, depending on the chosen target (criterion). The aim of the first chapter of this work is to analyze the interaction parameters that reduce the effect of fluid on an object, such as in skeleton sports. Using the laws of mechanics, a new method is developed, with which it is possible to analytically determine the coefficients (parameters) of ice friction and aerodynamic drag of a moving object. It has a wide range of applications in the training and competition process. In addition, the positive or negative effects of vibrations on the skeleton as it slides over the ice surface are considered. In these studies, the optimization criterion is energy savings on the race track. In turn, in solving energy extraction problems (in the second part of the work) a new method (theory) is developed, which helps to easily perform analysis, optimization and synthesis tasks for object interaction with liquids, if there is translational, rotational or complete motion of objects. shaped bodies in a fluid (liquid, gas), if it is possible to mathematically describe the interaction surfaces. The method was tested with computer programs and experimentally in the wind tunnel "Armfield". The third part of the work deals with several other studies of fluid dynamics, including: – studied the actuator of robotic fish movement; – energy production equipment from robotic fish tail fin oscillations was analyzed and synthesized; – parametric shape optimization for SUP board drive fin motor cover was performed; – practical experiments were performed for a double valve in a wind tunnel and they were compared (validated) with a mathematical model.