Author:
Ullas P.K.,Chatterjee Dhiman,Vengadesan S.
Abstract
Purpose
Understanding the interaction of turbulence and cavitation is an essential step towards better controlling the cavitation phenomenon. The purpose of this paper is to bring out the efficacy of different modelling approaches to predict turbulence and cavitation-induced phase changes.
Design/methodology/approach
This paper compares the dynamic cavitation (DCM) and Schnerr–Sauer models. Also, the effects of different modelling methods for turbulence, unsteady Reynolds-averaged Navier–Stokes (URANS) and detached eddy simulations (DES) are also brought out. Numerical predictions of internal flow through a venturi are compared with experimental results from the literature.
Findings
The improved predictive capability of cavitating structures by DCM is brought out clearly. The temporal variation of the cavity size and velocity illustrates the involvement of re-entrant jet in cavity shedding. From the vapour fraction contours and the attached cavity length, it is found that the formation of the re-entrant jet is stronger in DES results compared with that by URANS. Variation of pressure, velocity, void fraction and the mass transfer rate at cavity shedding and collapse regions are presented. Wavelet analysis is used to capture the shedding frequency and also the corresponding occurrence of features of cavity collapse.
Originality/value
Based on the performance, computational time and resource requirements, this paper shows that the combination of DES and DCM is the most suitable option for predicting turbulent-cavitating flows.
Subject
Applied Mathematics,Computer Science Applications,Mechanical Engineering,Mechanics of Materials
Reference69 articles.
1. Simulations of cavitating flows using hybrid unstructured meshes;Journal of Fluids Engineering,2001
2. Cavitation modeling using compressible Navier–Stokes and Korteweg equations;Computational Methods in Multiphase Flow VIII,2015
3. Experimental and numerical investigation on the performance of small-sized cavitating Venturis;Flow Measurement and Instrumentation,2015
4. Finite volume simulation of cavitating flows;Computers and Fluids,2005
5. Analysis of transient cavitating flows in diesel injectors using diesel and biodiesel fuels;SAE International Journal of Fuels and Lubricants,2010
Cited by
8 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献