Evaluation Of Wind Effects Research Articles

Evaluation of Wind Effects on High-Rise Buildings Using Ansys CFX

Tall building is the growing pattern of cities, these buildings are highly vulnerable to wind loads. Wind load effects on the high-rise building can be found using wind tunnel testing and CFD tools. Wind tunnel facilities are limited all around the world, so CFD tools can be incorporated. In this study, ANSYS CFX is used to investigate the effects of wind on different shapes of high-rise buildings. The results of numerical simulation are compared with the international standards of various countries. Streamline patterns and pressure contours on different faces are discussed in this paper. It is found that building shape and size are having a direct effect on the pressure distribution on various surfaces of the building model. Windward face pressure will always be positive in nature. In this study, the comparison is presented for the variation in the cross-sectional shape of the building model. For this purpose Model C and Model I are having considerable variations and Model X is considered for validation purposes only. It is well established that the results are within the allowable limit. This paper aims to discuss these windgenerated effects in the tall building model.

An inflow turbulence generation method for large eddy simulation and its application on a standard high-rise building

Generating an inflow turbulence satisfying the near-ground wind characteristics of the atmospheric boundary layer is an important prerequisite to accurately predict the wind effects on buildings and structures using large eddy simulation (LES). An inflow turbulence generation method named as reusable wind tunnel replication method (RWTR) for LES is presented in this paper. The validation study is performed by numerical simulation of a real wind tunnel. And then the RWTR method is applied to a large eddy simulation to study the wind effects on a standard high-rise building, including the flow field characteristics, wind pressure and base bending moment. The advantages and limitations of the RWTR method are discussed by comparing of the calculated results with available wind tunnel measurements and previous numerical simulation results. Several suggestions are provided to improve the performances of this inflow turbulence generation method. The research results are helpful in the evaluation of wind effects on buildings using LES, for which the inflow turbulence matching the characteristics of near-ground turbulence can be conveniently generated based on the proposed method.

Evaluation of Wind Effects on Super-Tall Buildings using CFD Simulation and 3D Visualization

Evaluation of Wind Effects on Super-Tall Buildings using CFD Simulation and 3D Visualization

Large-eddy simulation of wind effects on a super-tall building in urban environment conditions

A combined study of large-eddy simulation (LES), wind tunnel testing and full-scale measurement is conducted for the evaluation of wind effects on a super-tall building in a complex urban area. To validate the numerical simulations, the wind tunnel experiments including synchronous multi-pressure and high-frequency force balance model tests are conducted in a boundary layer wind tunnel laboratory. The numerical predictions are then compared with the experimental results, demonstrating that the LES can provide comparable predictions of the wind effects on the super-tall building. Furthermore, the cross-validation of the predicted displacement responses by the LES against the wind tunnel and full-scale measurements are presented and the agreement among them is reasonably good. The main objective of this study is to explore an effective numerical approach for the accurate estimation of wind effects on tall buildings in urban environment conditions and promote the practical use of the LES in the wind-resistant design of complex structures.

Dynamic Wind Effects on Buildings with 3D Coupled Modes: Application of High Frequency Force Balance Measurements

Contemporary high-rise buildings with complex geometric profiles and three-dimensional (3D) coupled mode shapes often complicate the use of high frequency force balance (HFFB) technique customarily used in wind tunnel testing for uncoupled buildings. In this study, a comprehensive framework for the coupled building response analysis and the modeling of the associated equivalent static wind loads using the HFFB measurement is presented. This includes modeling of building structural systems whose mass centers at different floors may not be located on a single vertical axis. The building response is separated into the mean, background, and resonant components, which are quantified by modal analysis involving three fundamental modes in two translational and torsional directions. The equivalent static wind load is described in terms of the modal inertial loads. The proposed framework takes into account the cross correlation of wind loads acting in different primary directions and the intermodal coupling of modal responses with closely spaced frequencies. Wind load combination is revisited in the context of modeling of the equivalent static wind loads. A representative tall building with 3D coupled modes and closely spaced frequencies is utilized to demonstrate the proposed framework and to highlight the significance of cross correlation of wind loads and the intermodal coupling of modal responses on the accurate prediction of coupled building response. Additionally, delineation of the proper role of the correlation between integrated loads, modal response, and respective building response components in the evaluation of wind effects on coupled buildings is underscored.

Computational Modeling of Wind Flow Around a Group of Buildings

In the present paper attention is focused on applications of computational flow modeling for the evaluation of wind effects around a single building, between two parallel buildings and around a collection of buildings by using Reynolds averaged Navier–Stokes (RANS) equations based turbulence models, namely the standard turbulence model and the RNG turbulence model and the large eddy simulation (LES) approach, namely the RNG based sub-grid scale model. The relative performance of turbulence models for a single building is assessed by comparison with the experimental data, and the numerical calculations are further extended to analyze the wind effects between two parallel buildings and multiple buildings in consideration of varying building configuration and the passage width. All numerical simulations are carried out using the finite volume method (FVM). It is confirmed that the current improved LES based CFD techniques are rather promising to study the turbulent atmospheric boundary layer flow around the buildings as compared with the RANS equations based turbulence models.

Evaluation of wind effects on a supertall building based on full-scale measurements

This paper describes the results obtained from the full-scale measurements of wind effects on a 70-storey building in Hong Kong. The building which has a height of approximately 370 m is the second tallest structure in Hong Kong. The field data such as wind speed, wind direction and wind-induced acceleration responses have been measured since 1995 including the close passage of two typhoons; typhoon Sally and typhoon Kent. Detailed analysis of the field data is conducted. The full-scale measurements are compared with the wind tunnel results obtained in the Boundary Layer Wind Tunnel Laboratory at Western Ontario University. The amplitude-dependent characteristics of damping and natural frequency that were obtained by using the random decrement technique are investigated. Copyright © 2000 John Wiley & Sons, Ltd.

Influence of computational parameters on the evaluation of wind effects on the building envelope

Influence of computational parameters on the evaluation of wind effects on the building envelope

Evaluation of wind effects on model buildings by the random vortex method

The random vortex method is a grid-free method for the numerical solution of the Navier–Stokes equations at high Reynolds numbers. This numerical method simulates the flow inside the boundary layer by vortex sheets and the flow outside this layer by vortex blobs. The algorithm produces a smooth transition between the sheets and the blobs. The main advantage of the random vortex method is to avoid the effect of numerical diffusion due to finite differentiation. This grid-free method is particularly attractive for the simulation of flows at high Reynolds numbers. In this paper we present the computation of the turbulent flow of air over a scale model in wind tunnel using the random vortex method.