Performance of a TMD to Mitigate Wind-Induced Interference Effects between Two Industrial Chimneys

James Mark William Brownjohn,Antolín Lorenzana,Ali Vasallo Belver,Álvaro Magdaleno

doi:10.3390/act10010012

James Mark William Brownjohn, Antolín Lorenzana + Show 2 more

Open Access

https://doi.org/10.3390/act10010012

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Journal: Actuators	Publication Date: Jan 11, 2021
Citations: 3	License type: CC BY 4.0

Affiliation: University of Exeter, University of Valladolid

Abstract

The present paper studies the performance of a tuned mass damper (TMD) installed in a 183 m tall chimney located at the edge of the wake shed by another chimney. Numerical and experimental results are available. For the simulations, wind action is considered by solving several 2D flow problems on a selected number of horizontal planes, in the transverse direction to the stacks. On such planes, Navier-Stokes equations are solved to estimate the fluid action at different positions of the chimneys and standard interpolation techniques are applied in the vertical direction. An Arbitrary Lagrangian-Eulerian (ALE) approach is used to consider the moving domain, and a fractional-step scheme is used to solve the fluid field. For the structural modelling, chimneys are meshed using 3D beam finite elements. The time integration procedure used for the structural dynamics is based on the standard second order Bossak method. For each period of time, the fluid problem is solved, the aeroelastic analysis is carried out and the geometry of the fluid mesh of each plane is updated according to the structural movements. With this procedure and model updating techniques, the response of the leeward chimney is evaluated for different scenarios, revealing an interesting dependence of the TMD performance on the wind speed and direction.

Highlights

The design of large, reinforced concrete chimneys is usually based on the assumption of an isolated structure under wind loading
A simplified numerical method for the evaluation of vortex induced vibrations in line-like slender structures has been checked in a particular chimney equipped with a tuned mass damper (TMD) and the interference effects associated with the construction of a new chimney in the vicinity of the previous one
The response of the old chimney is shown to have been very different depending on the wind speed and direction

Summary

Introduction

The design of large, reinforced concrete chimneys is usually based on the assumption of an isolated structure under wind loading. For a wide range of wind directions, the chimneys will behave to the isolated ones, but their across-wind response can compromise the structural safety of the leeward chimney when they are noticeably in-line [4,5] This effect is due to the turbulence of the oncoming wind and vortices separating from the upwind chimney may induce further dynamic loads. As the main flow acts in the transversal direction, the presence of fluid shear forces causes the Strouhal (St) number to vary along the chimney length, so the vortex shedding takes place in spanwise cells with constant frequency over each cell [8,9,10,11] In this way, based on the fact that vortices are organized in volumetric cells, just a few planes are necessary and the assumption that the flow among neighbouring planes is independent can be made. As its amplitude is much smaller than the one in the across-wind direction, its effects are usually neglected

Wind-Structure Interaction Numerical Technique

Application

Assessment of the TMD Performance

Acceleration

13. Across-wind

7.7.Discussion

Conclusions