Estudo do escoamento turbulento em máquinas de fluxo regenerativas toroidais utilizando o método dos volumes finitos e o algoritmo sola

Abstract

By using the finite volume method and SOLA algorithm, the study of turbulent twodimensional flow in a toroidal regenerative turbomachine is carried out. The equations representing the movement in cartesian coordinates are transformed into a coordinate system developed specially for this machine. The two-equation turbulence model κ−ε and the convective scheme “QUICK” are used. The resulting equation system is solved by using Choleski method. Results for the slip factor, head coefficient, and vorticity are presented and compared with literature. Along the development of the present Thesis until the study of toroidal regenerative turbomachine, two tests were carried out: first, the laminar flow in the cascade flat plates was analyzed in order to check the behavior of the computational program in this situation. Second, a comparison between Smagorinsky Subgrid Model and Velocity Structure Function Model was made using the finite volume method, applied to the flow in transition to turbulence in backward facing step, in order to familiarize with large edge simulation, that is a modern turbulence model with great perspective to the future.