Estudio numérico del flujo cavitativo alrededor de un venturi y un hidroálabe plano convexo con un obstáculo semicircular

Abstract

The present work carried out the numerical study of unsteady cavitating flow around a Venturi and a plane-convex hydrofoil with a semicircular obstacle (HFC). The aim of this study is to understand the topology and behavior of the phenomenon, from cavity formation to its collapse. Based on computational fluid dynamics (CFD), a methodology was developed to study the different stages of cavitating flow. The numerical study was conducted in OpenFOAM's open source environment with the use of the Gmsh and SnappyHexMesh meshing tools. The resolution of Navier-Stokes equations was performed with the PIMPLE algorithm with RANS approximation. In addition, the k-omega SST SAS turbulence model and the Zwart-Gerber-Belamri (ZGB) cavitation model were used to study phase change. The results obtained were validated with previous studies by graphical comparison of experimental data and numerical simulations. The results show the presence of two pressure peaks corresponding to the detachment and collapse of the cavity in the Venturi. While, in the case of HFC, the separate and attached cavitation cloud was captured for the 3D case.