scholarly journals EFFECT OF PERIODIC FLUCTUATION BEHIND BUILDING ON REATTACHMENT LENGTH : Large eddy simulation of flowfield around a high-rise building (Part 1)

2004 ◽  
Vol 69 (581) ◽  
pp. 45-51 ◽  
Author(s):  
Yoshihide TOMINAGA ◽  
Akashi MOCHIDA ◽  
Shuzo MURAKAMI ◽  
Satoshi SAWAKI
Keyword(s):  
Large Eddy Simulation ◽  
Reattachment Length ◽  
Periodic Fluctuation ◽  
High Rise ◽  
High Rise Building ◽  
Eddy Simulation ◽  
Large Eddy

Large-eddy simulation evaluation of wind loads on a high-rise building based on the multiscale synthetic eddy method

2018 ◽  
Vol 22 (4) ◽  
pp. 997-1006 ◽  
Author(s):  
Yin Luo ◽  
Hongjun Liu ◽  
Huili Xue ◽  
Kun Lin
Keyword(s):  
Large Eddy Simulation ◽  
Wind Pressure ◽  
Turbulent Structures ◽  
Building Model ◽  
High Rise ◽  
High Rise Building ◽  
Eddy Simulation ◽  
Simulation Evaluation ◽  
Large Eddy ◽  
Inflow Turbulence

In this study, the multiscale synthetic eddy method, which can establish coherent turbulent structures and satisfy predefined turbulent statistical and spectral properties, is employed to generate the inflow turbulence for large-eddy simulation of a high-rise building. The recycling method of Lund and synthetic eddy method is also applied to assess the suitability of multiscale synthetic eddy method. The wind pressure at each mesh face centre on the surface of the high-rise building model is exported in the simulation to determine the wind-induced aerodynamic loads. Compared with the synthetic eddy method, the multiscale synthetic eddy method result is in higher agreement with that of the recycling method of Lund in terms of the wind pressure distribution, wind load characteristic and external flow field of the high-rise building.

Large-eddy simulation of vortex streets and pollutant dispersion behind high-rise buildings

2017 ◽  
Vol 143 (708) ◽  
pp. 2714-2726 ◽  
Author(s):  
Beom-Soon Han ◽  
Seung-Bu Park ◽  
Jong-Jin Baik ◽  
Junho Park ◽  
Kyung-Hwan Kwak
Keyword(s):  
Large Eddy Simulation ◽  
Pollutant Dispersion ◽  
High Rise ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Vortex Streets

scholarly journals Large Eddy Simulation of Wind Flow over A Realistic Urban Area

Computation ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 47
Author(s):  
Gokhan Kirkil ◽  
Ching-Long Lin
Keyword(s):  
Large Eddy Simulation ◽  
Large Scale ◽  
Urban Canopy ◽  
Tall Buildings ◽  
Wind Flow ◽  
High Rise ◽  
Eddy Simulation ◽  
Heat Effects ◽  
Large Eddy ◽  
Canopy Flows

A high-resolution large eddy simulation (LES) of wind flow over the Oklahoma City downtown area was performed to explain the effect of the building height on wind flow over the city. Wind flow over cities is vital for pedestrian and traffic comfort as well as urban heat effects. The average southerly wind speed of eight meters per second was used in the inflow section. It was found that heights and distribution of the buildings have the greatest impact on the wind flow patterns. The complexity of the flow field mainly depended on the location of buildings relative to each other and their heights. A strong up and downflows in the wake of tall buildings as well as large-scale coherent eddies between the low-rise buildings were observed. It was found out that high-rise buildings had the highest impact on the urban wind patterns. Other characteristics of urban canopy flows, such as wind shadows and channeling effects, are also successfully captured by the LES. The LES solver was shown to be a powerful tool for understanding urban canopy flows; therefore, it can be used in similar studies (e.g., other cities, dispersion studies, etc.) in the future.

Large eddy simulation coupled with immersed boundary method for turbulent flows over a backward facing step

2020 ◽  
pp. 095440622095489
Author(s):  
Dandan Yang ◽  
Sida He ◽  
Lian Shen ◽  
Xianwu Luo
Keyword(s):  
Large Eddy Simulation ◽  
Flow Separation ◽  
Reverse Flow ◽  
Immersed Boundary ◽  
Reattachment Length ◽  
Backward Facing Step ◽  
Mean Velocity ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Ib Method

In the present work, large eddy simulation coupled with immersed boundary (LES-IB) method is applied to simulate a backward facing step (BFS) flow, which is a canonical fluid dynamics problem involving flow separation, recirculation and reattachment that are common in many practical applications. The computed reattachment length, a primary parameter to evaluate the overall performance of the numerical method, shows promising accuracy in the present work compared to the alternative numerical simulations. Based on the mean velocity profiles at four representative locations, there is fairly well quantitative agreement among the present LES-IB, DNS and the experiment. The results reveal that the reverse flow in the reattachment region leads to little over-prediction of the reattachment length compared to the DNS result. Furthermore, second-order statistics are in good agreement with the reference data in spite of discrepancies in the recirculation and reattachment region owing to complex flow structure, verifying the accuracy of the present method. In addition, the instantaneous flow fields are also analyzed to show the capability of the present LES-IB method in vortex-capture, and one may see the transient process of flow separation based on the analysis of Lagrangian coherent structure (LCS).

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