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Numerical Study on Vortex-Induced Vibration of a Square Cylinder and Its Suppression

Author: WangChao
Tutor: ZhouChaoYing
School: Harbin Institute of Technology
Course: Mechanical and Electronic Engineering
Keywords: Flow around a square cylinder Vortex induced vibrations Drag Reduction
CLC: TB53
Type: Master's thesis
Year: 2008
Downloads: 83
Quote: 0
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Abstract


Associated with the fluid mechanical and engineering, vortex induced vibration (Vortex-Induced Vibrations, VIV) is an important issue related to security. In some adverse conditions, flow-induced vibration can cause structural collapse, and even lead to disaster. In practical structures in a square cylinder is a common shape, the study of flow around a square cylinder to become a research-related engineering problems of basic research, and because the flow around square cylinder contains many of the basic phenomena such as hydrodynamics boundary layer separation, laminar turbulent transition, etc., so the study of flow around a square cylinder has a strong application background and important academic value. In this paper, numerical fluid dynamics method, the incoming flow Reynolds number is 200 square columns under elastic support vortex-induced vibration phenomena, as well as through the square cylinder placed upstream of the control film to drag reduction and vibration control mechanism was studied. The text of the flow field simulation using the computational fluid dynamics software FLUENT, by solving the incompressible Navier-Stokes equations viscous fluid flow field obtained physical quantities; cylinder vibration simulation using a mass - spring - damper system, using the classical Runge - Kutta method to solve the cylinder vibration equation; coupling between fluid and solid use of the FLUENT user-defined function (UDF), the vibration response of the cylinder embedded in FLUENT, to achieve the alternating flow field calculation and structural dynamic response fluid-solid half-coupling calculation, that at each time step, taking into account the interaction between fluid and solid, respectively, to solve the equations of fluid motion and vibration equation of the cylinder, thus simulating fluids and square columns between the nonlinear coupling. Right to Reynolds number of 200 square columns under elastic support vortex-induced vibration of a systematic study successfully captured the \column below displacement, amplitude, shape and wake up in a different drag coefficient frequency ratio and mass ratio changes of conditions. For further papers placed before the control column in the square piece of flow control problem is studied, systematic analysis of the control panel height and the control plate and the spacing between each square column column lift and drag coefficients and characteristics of wake flow analyzes control chip flow around each column drag reduction and damping mechanism, and reveals the critical spacing and the existence of quasi-steady-state and under different conditions, drag reduction and damping control tablets best placement. Dissertation research on practical engineering problems have good guidance.

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control
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