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Numerical method for simulating cycle stress of bridge pier

A numerical method and technology of bridge piers, which are applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as inability to further improve, uncertain stability effects of convergence, etc.

Inactive Publication Date: 2017-07-07
成都金景盛风科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 2. The spatial discrete precision of the added vorticity is limited and cannot be further improved;
[0010] 3. The stability effect of the source term on the convergence of the numerical solution of the momentum equation is uncertain

Method used

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  • Numerical method for simulating cycle stress of bridge pier
  • Numerical method for simulating cycle stress of bridge pier
  • Numerical method for simulating cycle stress of bridge pier

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Embodiment Construction

[0066] The following uses a specific implementation to further illustrate the numerical method proposed by the present invention for simulating the pier period. This kind of numerical simulation technology can be realized with the Fortran90 computer high-level programming language, and the periodic vortex shedding flow field of three-dimensional flow can be simulated by computer operation.

[0067] In a specific embodiment, the flow field around the pier is a flow field dominated by vortex motion. The calculation grid uses a multi-block structured aptamer hexahedral grid, and an O-shaped grid is used around the pier, with 192 grids surrounding the pier section direction; 68 grids in the normal direction; 96 grids in the wingspan direction. The spatial discretization of numerical simulation adopts the Finite Volume Method. Each computational grid becomes a control unit, and the flow variable is in the center of the control unit.

[0068] The conditions of the numerical simulation a...

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Abstract

The invention discloses a numerical method for simulating a cycle stress of a bridge pier. According to characteristics of incompressible flow, force in two different forms is added in a momentum equation to improve numerical simulation precision of a type of flow field based on a vortex motion. The force in the two forms is spiral force and viscous dissipation force of vorticity in a varying gradient direction respectively. According to the method, integral computation of the spiral force of the vorticity in the varying gradient direction in a computational grid is converted into flux computation of force on a boundary of the computational grid; and meanwhile, a source item of the momentum equation reserves the viscous dissipation force of the vorticity in the varying gradient direction.

Description

Technical field [0001] The present invention relates to a numerical method in the application field of computational fluid dynamics, specifically A Numerical Method for Simulating the Periodic Force of Bridge Piers . Background technique [0002] When the river passes through large bridge piers, because of the pressure difference between the windward and leeward sides of the pier, a vortex of water will be generated behind the pier. The vortex continues to flow downward with the water, forming a series of shedding vortices. The flow of this series of shedding vortices is also called the Karman vortex street, which is a swirling flow field full of vortices. The flow field of river water flow can be regarded as an incompressible flow. In fact, the shedding vortex will periodically induce force on the bridge pier, which will cause the building to shake seriously. If the vortex shedding period is close to the self-excited frequency of the bridge pier building, the shaking of the bui...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 路明
Owner 成都金景盛风科技有限公司
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