A Numerical Calculation Method for Compressible Cavitation Flow

Abstract

The invention discloses a numerical calculation method of compressible cavitation flow, which can realize the calculation of the flow field of compressible cavitation flow with phase change, especially the refined simulation of cavitation shock wave dynamics. Including: adding the cavitation source term in the compressible phase fraction transport equation to obtain the compressible cavitation phase fraction transport equation of the effect of interphase mass exchange on the phase fraction; adding the cavitation source in the compressible cavitation pressure Poisson equation term, the compressible cavitation pressure Poisson equation of the effect of the interphase mass exchange on the pressure field is obtained, and then the velocity and flux are corrected for the interphase mass exchange; according to the compressible cavitation phase fraction of the effect of the interphase mass exchange on the phase fraction The transport equation and the compressible cavitation pressure Poisson equation for the action of interphase mass exchange on the pressure field and the correction equations for velocity and flux calculate the flow field parameters of the compressible cavitation flow; according to the flow field of the compressible cavitation flow Parametric analysis of multiphase shock and collapse shocks in cavitating flows and the effect of cavitation compressibility on flow field properties.

Description

technical field [0001] The invention relates to a numerical calculation method for compressible cavitation flow, which is applicable to the technical fields of ship and underwater vehicle engineering, multiphase flow and computational fluid dynamics, and is especially suitable for shock waves induced by strong cavitation and cavitation group collapse The generation and propagation characteristics of the capture. Background technique [0002] Cavitation occurs in the low-pressure region of high-speed water flow. Different from the approximate constant-pressure phase transition process driven by thermodynamic factors such as boiling and evaporation, the occurrence of cavitation is an approximate constant-temperature phase transition process driven by hydrodynamic factors, including violent unsteady phenomenon. The occurrence of cavitation will cause severe pressure pulsation, vibration, noise, and cavitation damage to mechanical parts. For example, the cavitation of the tip v...

AI Technical Summary

Problems solved by technology

However, in the process of cavitation evolution, especially the collapse of cavitation / vacuole clusters, the sharp changes in the local pressure field will cause significant changes in the density of liquid and vapor, which will have an important impact on the generation and propagation of shock waves

At present, there are generally algorithmic difficulties in the calculation of compressible multiphase flow. European and American scholars have been working on the research and improvement of the algorithm for many years. Therefore, a cavitation numerical simulation method that can consider the compressibility of liquid and vapor is established to realize A more profound simulation of the physical mechanism of cavitation flow has important scientific significance and engineering application value

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