Method for simulating cavitation flow with multi-scale self-adaption model

Abstract

The invention provides a method for simulating a cavitation flow with a multi-scale self-adaption model, and relates to the technical field of cavitation flow simulation. The simulation method accurately simulates large-scale cavitation interfaces and small-scale discrete bubbles and integrates a variety of algorithms or methods, comprising a continuous cavitation interface capture algorithm for volume fraction that discrete bubbles account for, a grid dynamic splitting method, a material derivative algorithm of discrete bubbles, a discrete bubbles growth collapse and merging breakage algorithm, and a discrete bubbles and continuous gas conversion algorithm. The simulation method accurately simulates large-scale cavitation interfaces and small-scale discrete bubbles, makes up for the shortcomings in traditional numerical calculation methods and realizes a complete description for multi-scale different cavitation morphologies.

Description

technical field [0001] The invention relates to the technical field of cavitation flow simulation, in particular to a method for simulating cavitation flow by using a multi-scale self-adaptive model. Background technique [0002] Cavitation is a common phenomenon inside hydraulic machinery. The unsteady characteristics of cavitation are the main causes of pressure pulsation, vibration, noise and cavitation in pumps, water turbines, underwater thrusters and complex piping systems. On the other hand, the development of supercavitation technology provides a new means for the speed increase of underwater weapons or aircraft. The use of supercavitation technology can make the aircraft avoid the viscous resistance of water under the gas package, so as to achieve underwater Super fast sailing. However, the application of supercavitation technology also brings great challenges to the control and motion stability of the vehicle. Whether it is cavitation in hydraulic machinery or th...

AI Technical Summary

Problems solved by technology

A single numerical calculation method is often not suitable for the above complex flow process

[0004] At present, the simulation of the cavitation flow process generally adopts the miscible method, the multi-fluid method or the interface capture method. Among these methods, the miscible method and the multi-fluid method can only describe the distribution characteristics of the gas phase content from a macroscopic perspective; the interface capture method can only approximate It realizes a physical step change on the interface, which has a smoothing effect on the microstructure of the phase interface, and it is difficult to describe the primary cavitation and the diffuse bubbles at the tail of the cavitation

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