Method for simulating water-gas two-phase homogeneous flow in a water delivery pipeline based on a finite volume method

Abstract

The invention discloses a method for simulating water-gas two-phase homogeneous flow in a water delivery pipeline based on a finite volume method. The method is based on a non-conservation form. the model pipeline in time and space is desricized through a finite volume method; Then, through the MUSCL-Hancoke format containing TVD, the reconstructed flow variable is obtained to have second-order accuracy. then,a Riemannian solution at an internal interface of the model is solved to obtain a calculated interface flux value; then, for boundary conditions of the model, a Newton iteration method isadopted to utilize Riemannian invariants and the like to obtain a second-order boundary value; then, a source item is introduced in the model, and the source item is desricized through a numerical method to enable the source item to have second-order precision; and finally, pressure fluctuation is simulated in the pipeline at any time based on initially given parameters (such as free gas content,pure water hammer wave velocity under normal pressure and the like). The result shows that compared with a traditional conservation form homogeneous flow model, the calculation precision and the calculation efficiency of the model are higher.

Description

technical field [0001] The invention relates to a method for simulating the water-air 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 us...

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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