Simulation of Partial and Supercavitating Flows around Axisymmetric and Quasi-3D Bodies by Boundary Element Method Using Simple and Reentrant Jet Models at the Closure Zone of Cavity

M Nouroozi,M Pasandidehfard,M H Djavareshkian

doi:10.1155/2016/1593849

M Nouroozi, M Pasandidehfard + Show 1 more

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https://doi.org/10.1155/2016/1593849

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Abstract

A fixed-length Boundary Element Method (BEM) is used to investigate the super- and partial cavitating flows around various axisymmetric bodies using simple and reentrant jet models at the closure zone of cavity. Also, a simple algorithm is proposed to model the quasi-3D cavitating flows over elliptical-head bodies using the axisymmetric method. Cavity and reentrant jet lengths are the inputs of the problem and the cavity shape and cavitation number are some of the outputs of this simulation. A numerical modeling based on Navier-Stokes equations using commercial CFD code (Fluent) is performed to evaluate the BEM results (in 2D and 3D cases). The cavitation properties approximated by the present research study (especially with the reentrant jet model) are very close to the results of other experimental and numerical solutions. The need for a very short time (only a few minutes) to reach the desirable convergence and relatively good accuracy are the main advantages of this method.

Highlights

The cavitating flows around various bodies have been the subject of extensive theoretical, numerical, and experimental research in recent decades
The tensile stress leads to the development of vapor cavities in the liquid
Cavitation is known for its destructive effects like noise production, corrosion, and reduction of efficiency; researchers and engineers attempt to minimize these destructive effects

Summary

Introduction

The cavitating flows around various bodies have been the subject of extensive theoretical, numerical, and experimental research in recent decades. Formation and growth of cavity usually occur when the liquid is subjected to sudden changes of pressure. This event can happen in many fluid systems like pumps, nozzles, turbine blades, and hydrofoils. In these systems, cavitation is known for its destructive effects like noise production, corrosion, and reduction of efficiency; researchers and engineers attempt to minimize these destructive effects. In high-speed submerged vehicles, cavitation is desired since it leads to a significant reduction of drag force. This advantage of cavitation phenomenon is exploited to increase velocity and efficiency [1]

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