Cavitation flow numerical simulation method based on Liutex-Omega vortex recognition theory

A numerical simulation and cavitation technology, applied in 3D modeling, image data processing, electrical digital data processing, etc., can solve the problem of low numerical accuracy of vortex cavitation flow, unable to reflect the characteristics of vortex cavitation flow, large deviation, etc. question

Active Publication Date: 2019-06-07
HOHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, regarding the cavitation model, the commonly used homogeneous flow model cannot reflect the influence of vortex motion on the mass transfer process during the cavitation phase transition, resulting in low numerical accuracy of the vortex cavitation flow. The predicted vortex cavitation flow The deviation between the actual flow state and the real flow state is large, which cannot reflect the characteristics of vortex cavitation flow

Method used

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  • Cavitation flow numerical simulation method based on Liutex-Omega vortex recognition theory
  • Cavitation flow numerical simulation method based on Liutex-Omega vortex recognition theory
  • Cavitation flow numerical simulation method based on Liutex-Omega vortex recognition theory

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Embodiment

[0079] In this embodiment, a three-dimensional hydrofoil with a blade tip clearance is used as an object to describe a cavitation flow numerical simulation method based on the Liutex-Omega vortex identification theory, such as figure 1 As shown, it mainly includes the following steps:

[0080] Step 1: The computational domain of the 3D hydrofoil with tip clearance is a rectangular flume, such as figure 2 a, 2b, the section of the three-dimensional hydrofoil is NACA0009 airfoil, the airfoil chord length C=0.1m, the length of the tank is 0.8m, the width is 0.15m, one side of the hydrofoil is connected with the side wall of the tank, and the other side is connected with it Adjacent walls have w tip = 1.98mm gap, use the geometric modeling software Croe to establish a three-dimensional geometric model of the computational domain, and output the *.igs format file for the computational grid division of step 2;

[0081] Step 2: Computational domain meshing, import the geometry fil...

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Abstract

The invention discloses a cavitation flow numerical simulation method based on a Liutex-Omega vortex recognition theory. The method specifically comprises the following steps of: judging a vortex region in a cavitation flow field by adopting a standardized Liutex-Omega vortex recognition coefficient L; effectively identifying a strong vortex region with rotating dominance, establishing a cavitation flow calculation fluid mechanics model based on a Liutex-Omega vortex identification coefficient omegaL partition according to a delay action mechanism of a strong vortex on a vapor-liquid condensation process in cavitation, and carrying out numerical calculation on a three-dimensional cavitation flow field to obtain vortex cavitation flow characteristics. Comparative analysis is carried out onan actual measurement result and an existing classical cavitation model calculation result; it is verified that the method can effectively reflect the vortex cavitation flow characteristics and the space-time evolution law of the vortex cavitation flow, the prediction precision of the vortex cavitation flow is remarkably improved, and the method can be popularized and applied to numerical simulation research of the vortex cavitation flow characteristics of three-dimensional hydrofoils, water pumps, water turbines, propellers and the like.

Description

technical field [0001] The invention belongs to the technical field of cavitation flow numerical simulation, and in particular relates to a cavitation flow numerical simulation method based on Liutex-Omega vortex identification theory. Background technique [0002] Cavitation is a unique phase transition phenomenon that occurs in the liquid phase. At a certain temperature, when the pressure in the water flow is reduced to its saturated vapor pressure, cavitation bubbles filled with gas and steam will be generated, that is, cavitation occurs in the water flow. Especially in the core area of ​​vortex flow, vortex cavitation is easily induced. Vortex cavitation is a common but complex form of cavitation. In the flow of vortex cavitation, the vortex and cavitation interact with each other. The vortex concentration area forms a low-pressure vortex to cause cavitation. At the same time, cavitation becomes a Mechanism of vortex influence. The appearance of vortex cavitation is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/00G06F17/50
Inventor 张睿徐辉费照丹
Owner HOHAI UNIV
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