Investigation of numerical models for predicting cavitation phenomenon in venturis using ANSYS FLUENT software

Document Type : Article

Authors

Faculty of civil engineering, University of Tabriz, Tabriz, Iran.

Abstract

In today's world, cavitation is one of the most important phenomena in fluid mechanics. A phenomenon in which very small bubbles are created during the flow as the flow moves and the pressure in some areas reaches the under pressure of the saturated vapor, and when these bubbles move and reach areas with higher pressure, they burst and create energetic microjets, which cause a lot of vibration and noise when these microjets hit the walls. It also causes destructive effects such as structural erosion of ships propellers, pump blades and dam overflow, and it also causes a decrease in efficiency and malfunction of hydraulic devices. Today, the phenomenon of cavitation in various fields, including marine industries, such as the construction of submarines and underwater projectiles, all kinds of valves and pumps, and some external flows, such as the overflow of hydropower plants and the overflow of dams, is considered. This phenomenon has attracted the attention of many scientists over time. These scientists have often looked for ways to eliminate or minimize the destructive effects caused by this phenomenon. Therefore, it is very important to find a better understanding about cavitation and the mechanism of its occurrence. In this research, it has been tried to study and compare different cavitation models in different geometries, and also, in one sample, the results of the numerical model have been compared with the results of the laboratory model. In general, in the computer analysis and comparison of the convergence speed of the Schooner and Zwart models, it was observed that the convergence speed of the Schnerrand model is higher than the convergence speed of the Zwart model. The speed obtained in the throat under the same conditions shows a constant value in all models, which shows that the speed is independent of both Schnerrand and Zwart models.

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Sharif Journal of Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 21 September 2024

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