Simulation method of gas-liquid two-phase homogeneous flow in water pipeline based on finite volume method

Abstract

The invention discloses a method for simulating water-air two-phase homogeneous flow in a water pipeline based on a finite volume method. The method is based on a non-conservative form; the model pipeline is discretized in time and space by the finite volume method; Then, through the MUSCL-Hancoke format containing TVD, the reconstructed flow variables are obtained to have second-order precision; then, the Riemann solution at the internal interface of the model is solved to obtain the calculated interface flux value; then, for the boundary conditions of the model, Use the Newton iteration method to use the Riemann invariant to wait until the second-order boundary value; then, enter the source item in the model, and use the numerical method to discretize it to make it have second-order accuracy; finally, based on the initially given parameters (free Gas content, pure water water hammer wave velocity under normal pressure, etc.), to simulate the pressure fluctuation in the pipeline at any time. The results show that the calculation accuracy and efficiency of the model are higher than those of the traditional conservative homogeneous flow model.

Description

technical field [0001] The invention relates to a simulation method of gas-liquid two-phase homogeneous flow in a water delivery pipeline based on a finite volume method, and belongs to the technical field of hydraulic numerical simulation calculation of a hydropower station (pump station). Background technique [0002] In the water pipeline system, the sudden opening and closing of the valve or the unit may cause a sudden change in the pressure in the pipeline. When the pressure change in the pipeline exceeds the bearing capacity of the pipe wall material, it may cause serious damage to the pipeline system and even threaten personal life. Safety. In recent years, the problem of two-phase flow in pipelines has been a hot research topic at home and abroad. Unlike the general single-phase flow problem, two-phase flow needs to consider the coupling effect between different phases. In two-phase flow problems, the homogeneous flow model is considered to be the most widely used m...

AI Technical Summary

Problems solved by technology

Nevertheless, compared with models such as MOC, the model proposed by León et al. still has the problem of low computational efficiency. Therefore, the research of high-efficiency and high-precision models is still an important topic at home and abroad.

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