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Application de l’approche de simulation des grandes échelles à l’évaluation des charges de vent sur les structures

Abstract : High-rise buildings are built with increasingly low weight and structural damping in relation to the evolution of construction techniques and materials. The understanding of dynamic wind loads is an important issue for the design of high-rise buildings in order to guarantee their structural safety. The objective of the present work is to assess the ability of large eddy simulation (LES) to predict wind loads on structures and to investigate the influence of the inflow boundary conditions of a LES simulation on these loads. Experiments were carried out at a small scale in the NSA atmospheric wind tunnel of CSTB to document the modeled atmospheric boundary layer, to characterize its interaction with a building and the resulting static and dynamic wind loads. The wake flow around the building has been characterized by PIV measurements. Global and local wind loads were measured by a high frequency force balance and high frequency pressure taps. These wind tunnel experiments allowed for the development of an inflow turbulence generator for the LES simulation,which was aimed at reproducing the main characteristics of turbulence in the boundary layer. The database also made it possible to assess the quality of the results of the LES simulations carried out with the OpenFOAM code in the same configuration as the experiment. The use of both the new turbulence generator and a degraded one that does not account for all the characteristics of the flow has made it possible to show the necessity to reproduce the characteristics of the upstream wind flow in order to access the dynamic wind loads on the building.
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Submitted on : Thursday, May 9, 2019 - 1:08:07 PM
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  • HAL Id : tel-02124197, version 1

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Risheng Sheng. Application de l’approche de simulation des grandes échelles à l’évaluation des charges de vent sur les structures. Mécanique des fluides [physics.class-ph]. École centrale de Nantes, 2017. Français. ⟨NNT : 2017ECDN0030⟩. ⟨tel-02124197⟩

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