Finite element analysis method for flow field of ice-coated power transmission line based on S-A turbulence model

Abstract

The invention discloses an S-A turbulence model-based finite element analysis method for an ice-coated power transmission line flow field. The method specifically comprises the following steps of 1, determining a physical model and working conditions of an ice-coated power transmission line; step 2, establishing a dimensionless boundary condition and an initial condition of the ice-coated power transmission line; 3, constructing an ice-coated power transmission line flow field finite element grid; 4, a turbulent flow field control equation is established; 5, constructing a finite element numerical algorithm for solving the control equation, wherein the finite element numerical algorithm comprises time discretization, space discretization and numerical solution processes; and 6, analyzing a numerical calculation result of the ice-coated power transmission line. Through coordinate transformation along a streamline, a closed RANS equation without convection terms and based on an S-A model is obtained, so that the RANS equation has an optimal solution when spatial discretization is carried out by adopting a Galerkin method.

Description

technical field [0001] The invention relates to the technical field of drilling slips, in particular to a finite element analysis method for the flow field of an ice-covered transmission line based on the S-A turbulence model. Background technique [0002] With the continuous development of high-voltage and ultra-high-voltage transmission lines in my country, the flow-induced effect caused by the wind load after icing has attracted more and more attention and research from many scholars. When the fluid flows around the surface of the structure, the fluid will give an excitation to the structure, and then induce the vibration of the structure. The vibration forms of ice-covered transmission lines are mainly vortex-induced vibration and galloping vortex-induced vibration. After the wind flows around the transmission line, the vortex alternately falls off in the wake area, causing periodic vibration of the transmission line. When the aerodynamic coefficient formed by the wind ...

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Problems solved by technology

At present, the RANS equation is mainly solved by the characteristic line splitting method (CBS method) and the upwind finite element method (SUPG method). The obtained lift peak jump phenomenon (the lift increases with the increase of the wind angle of attack, and suddenly decreases sharply at a certain critical wind angle of attack) is not obvious

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