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Calculation simulation method suitable for compressible two-phase flow

A simulation method and phase flow technology, applied in the field of computational fluid dynamics, to achieve the effect of a reliable numerical simulation platform

Pending Publication Date: 2021-05-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] Compared with single-phase flow, compressible two-phase flow has a complex wave system structure, which involves the spatio-temporal evolution process of strong shock waves and large density ratio two-phase interfaces, which poses a huge challenge to numerical simulation research

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  • Calculation simulation method suitable for compressible two-phase flow
  • Calculation simulation method suitable for compressible two-phase flow
  • Calculation simulation method suitable for compressible two-phase flow

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Embodiment Construction

[0074] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0075] Underwater explosion is a typical compressible two-phase flow problem. For example, the numerical simulation calculation area of ​​the underwater silver trinitride explosion problem given in this embodiment is as follows figure 1 As shown, the unit is m. The calculation area is {(x,y)|0≤x≤0.35,0≤y≤0.35} (unit: m), the horizontal plane separating air and water is located at y=0.175m, the diameter of the explosion nucleus is 0.01m, and the center position is (0.175m, 0.125m). The grid resolution used in the calculation is 3000×1000, and the value of CFL is 0.1. The specific initial conditions of this example are sh...

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Abstract

The invention provides a computational simulation method suitable for compressible two-phase flow, which adopts a five-equation model to describe the flow of a compressible two-phase interface, and couples five equations with a rigid gas state equation to enable the equations to be closed. According to the method, a finite volume method is adopted to discretize an equation set, a three-order TVD format is adopted to carry out spatial reconstruction on original variables, an HLLC approximate Riemann solver is adopted to solve numerical flux of unit boundaries, and a three-order explicit Runge-Kutta format is adopted to carry out time marching. According to the calculation simulation method, shock wave discontinuity, substance contact discontinuity and expansion waves can be accurately captured, and a reliable numerical simulation platform is provided for numerical simulation research of two-phase flow.

Description

technical field [0001] The invention belongs to the technical field of computational fluid dynamics, and in particular relates to a computational simulation method suitable for compressible two-phase flow. Background technique [0002] Compressible two-phase flow is an active and challenging research field, which is of great significance in theoretical research and engineering applications, and widely exists in aerospace, chemical production, biomedicine, agricultural production and other fields. [0003] In aerospace and other fields, the interaction between shock wave and liquid droplet is a typical two-phase flow problem. When the aircraft passes through the cloud or rain area at high speed, the shock wave generated near the surface of the aircraft interacts with the raindrops suspended in the air, and the raindrops will damage the surface of the aircraft during the breaking process, that is, raindrop erosion. In-depth study of the physical mechanism of the interaction b...

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Application Information

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IPC IPC(8): G06F30/15G06F30/23G06F30/28G06F111/10G06F113/08G06F119/14
CPCG06F30/15G06F30/23G06F30/28G06F2111/10G06F2113/08G06F2119/14Y02T90/00
Inventor 陈娇娇屈峰钟家祥黎明白俊强
Owner NORTHWESTERN POLYTECHNICAL UNIV
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