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

An adaptive model and multi-scale technology, applied in the field of cavitation flow simulation, can solve problems such as difficult to describe the initial cavitation, diffuse bubbles, and inapplicability

Inactive Publication Date: 2019-07-30
HOHAI UNIV
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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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  • Method for simulating cavitation flow with multi-scale self-adaption model

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Embodiment Construction

[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] The present invention proposes a simulation method using a multi-scale self-adaptive model, which is to carry out simulation calculations for the three media of liquid, gas and discrete bubbles at the same time. figure 1 It is a schematic diagram of the simulation process, and the specific steps are as follows:

[0053] Step S1: Carry out grid division on the pre-set calculation domain, and determine the boundary conditions and the physical parameters of the gas-liquid two-phase;

[0054] Step S2: For the interface between the gas-liquid two phases caused by the phase change in step S1, the boundary condition parameters between the liquid and the gas are calculated by using the continuous cavitation interface capture algorithm of the volume fraction of the discrete bubbles; figure 2 As shown, the cavitation bubble structure o...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 李林敏辛子扬黄浩乾许昌
Owner HOHAI UNIV
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