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Water hammer finite volume simulation method considering dynamic friction explicitly

A technology of finite volume and simulation method, applied in the direction of design optimization/simulation, etc., can solve the problems of low calculation accuracy and calculation speed of water hammer process simulation, and achieve the effect of easy implementation, accurate head loss and simple solution

Active Publication Date: 2020-09-22
HOHAI UNIV
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Problems solved by technology

[0006] Purpose of the invention: The purpose of this application is to provide a water hammer finite volume simulation method that explicitly considers dynamic friction resistance, so as to solve the defects of low calculation accuracy and calculation speed of water hammer process simulation

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  • Water hammer finite volume simulation method considering dynamic friction explicitly
  • Water hammer finite volume simulation method considering dynamic friction explicitly
  • Water hammer finite volume simulation method considering dynamic friction explicitly

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0048] The present invention provides a water hammer finite volume simulation method that explicitly considers dynamic friction, such as figure 1 As shown, the second-order Godunov scheme based on the finite volume method is used to simulate the hydraulic transient process of the pipeline by explicitly calculating the dynamic friction method, including:

[0049] S101 divides the calculation grid according to the finite volume method, establishes control equations for the divided control units, and determines initial conditions and boundary conditions based on engineering examples. Among them, according to the specific working conditions, the initial conditions mainly include the upstream water head, the length of the pipeline, and the inner diameter of the pipeline.

[0050] Specifically, the motion equation and continuity equation describing the flow state ...

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Abstract

The invention discloses a water hammer finite volume simulation method considering dynamic friction explicitly. Firstly, a finite volume method is used for discretizing a model, a Rieman solver is used for solving discrete flux, and meanwhile a convective term is introduced into calculation. Reconstructing is performed by adopting a MUSCL-Hancock method to obtain a Godunov format with second-orderprecision, a MINMOD slope limiter is introduced in order to avoid false oscillation, an explicit solving method is adopted, a dynamic friction item is considered; and finally, a virtual boundary processing method is applied to achieve unified calculation of all nodes and boundaries of the calculation area. According to the method, a Godunov format of a second-order finite volume method is adopted, the influence of dynamic friction resistance is explicitly considered, numerical simulation is accurately and efficiently carried out on the pipeline water hammer process, and therefore reference isprovided for accurate and efficient real-time prediction and monitoring of possible hydraulic transient of the pipeline.

Description

technical field [0001] The invention relates to the simulation of hydraulic transient process, in particular to a water hammer finite volume simulation method which explicitly considers dynamic friction resistance. Background technique [0002] During the energy conversion process of the pipeline system of pumped storage power station, in order to meet the dynamic change of grid load, complex hydraulic transients often occur. Dangerous water hammer events caused by some improper operation of turbines / valves in the water system, which may generate abnormal high pressure, cause pipeline rupture and damage other hydraulic devices. Accurate and effective numerical simulation of possible water hammer events can provide reference for the rational design and safe operation of pumped storage power plant piping systems. The existing simulation methods mainly include Method Of Characteristics (MOC), Finite Volume Method (FVM) and Computational Fluid Dynamics (CFD). [0003] The meth...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28
CPCG06F30/28
Inventor 周领曹云刘静李赟杰方浩宇薛子剑
Owner HOHAI UNIV