Mariusz Domagała

This paper presents CFD simulation of solid particle transport by jet pump. Simulation was conducted using Lagrangian-Eulerian CFD approach. There is presented simulation of transport of mixture of water and solid particles with various density by jet pump with annular motive nozzle. The CFD simulations allowed to obtain trajectory for individual particles as well as theirs maximal velocity.

Tidal energy might be extracted in a very similar way as the wind one by using turbines. However, due to
environmental conditions, unsteady nature of tidal currents and wave activity, tidal turbines have to fulfill
very demanding requirements. Such turbines might be structurally similar to wind turbines, but due to a different medium, the key issue is extracting tidal energy in the most effective way. This paper presents a way in which CFD tools may be used for selecting hydrofoil for tidal turbines.

Tidal turbines are gaining more and more interest as a source of renewable energy. Energy from tidal currents may be extracted in a similar way as wind energy but tidal turbines have to meet much higher requirements. Cavitation phenomena, which are difficult to predict, have great influence on hydrodynamic efficiency. This paper presents the use of CFD simulation for prediction of cavitation during flow over typical NACA airfoils.

This paper presents the modelling of a direct acting relief valve with the use of the new approach of CFD techniques which uses the Lattice Boltzman Method (LBM). It allows for eliminating the biggest problem that occurs during the simulation of a valve operation, which is the motion of a working component. During traditional CFD modeling, a deformed mesh has to be used in such a case, which may lead to the occurrence of computational cells with negative volume and, as a consequence, remeshing of fluid domain.

This paper presents an application of matrix FMEA analysis and cause-effect diagram for a double acting hydraulic cylinder. A decomposition of the investigated cylinder has been made and main functions and potential failures for the pair-function relation have been identified. Elements with the greatest probability of failure and cause-effect relationship have been determined.

This paper presents an attempt of using new capabilities of CFD tools in field of fluid-structure interaction simulation, which is called “immersed solids”. This techniques treats solids as objects immersed into fluid domain which moves along with the fluid. This paper presents comparison of selected CFD results of traditional approach and “immersed solids” technique on example of direct acting relief valve.

This paper presents simulation of cavitation phenomena at jet pumps with use of CFD methods. There was also presented theoretical consideration of cavitation formation and models applied at the CFD codes. On example of liquid-jet liquid pump, which working medium is water was presented simulation of cavitation process which was conducted in Ansys CFX code. This paper also includes some selected results of simulation for fluid flow at the jet pump with consideration of cavitation process.