Numerical Study of the Flow Fields in Downburst with Consideration of the Rough Condition on the Ground
Vol. 4 No. 8 (2018): August
Research Articles
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The downburst is an extreme weather condition whose resulting load will affect the stability of the building structures. The characteristic of downbursts is required during the design of buildings. In order to achieve the characteristics of the downbursts, large eddy simulation (LES) is adopted. The method impinging jet is used to reproduce the downbursts, meanwhile smooth and rough ground conditions are examined. The setting of the rough layer of the ground is done by using the immersion boundary method (IBM). After the simulation, the wind field is decomposed into the mean component and the turbulence component. In this paper, the radial wind speed profile and the wind speed time diagram of the simulation experiment are compared with the previous measured data and the simulation results. This paper reveals that the radial wind speed is the key part of the downburst wind speed, and it rapidly increases with height. It is also found that the rough ground will cause the peak radial velocity to move up, which is consistent with the change of the main annular vorticity in vortex cloud image analysis. Finally, the turbulence intensity is found to be relatively small at the position where the radial wind speed is relatively large.
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[28] Mason M S, Wood G S. "Loading of A Very Tall Building in A Simulated Downburst Wind Field.” Structural Engineering (2004).
[2] Hawers H., Dempsey D. "Review of Recent Australian Transmission Line Failures Due to High Intensity Winds.” Proceedings of the task force of high intensity winds on transmission lines, Buenos Aires (1993).
[3] Fujita, T.T. "Downbursts: Meteorological Features and Wind Field Characteristics.” Journal of Wind Engineering and Industrial Aerodynamics 36 (January 2003): 75–86. doi:10.1016/0167-6105(90)90294-M.
[4] Anderson J R, Orf L G and Straka J M. "A 3-D Model System for Simulating Thunderstorm Microburst Outflows.” Meteorol Atmos Phys 49 (March 1992): 125–131. doi:10.1007/bf01025404.
[5] Kim J, Hangan H. "Numerical Simulations of Impinging Jets with Application to Thunderstorm Downbursts.” Journal of Wind Engineering and Industrial Aerodynamics 95 (April 2007):279–298. doi:10.1016/j.jweia.2006.07.002.
[6] Sengupta A, Sarkar P P. "Experimental Measurement and Numerical Simulation of An Impinging Jet With Application to Thunderstorm Microburst Winds.” Journal of Wind Engineering and Industrial Aerodynamics 96 (March 2008):345–365. doi:10.1016/j.jweia.2007.09.001.
[7] Mason M, Wood G and Fletcher D. "Numerical Simulation of Downburst Winds.” Journal of Wind Engineering and Industrial Aerodynamics 97 (December 2009):523–539. doi:10.1016/j.jweia.2009.07.010.
[8] Mason M, Fletcher D and Wood G. "Numerical Simulation of Idealized Three-Dimensional Downburst Wind Fields” Engineering Structures 32 (November 2010):3558–3570. doi:10.1016/j.engstruct.2010.07.024.
[9] Mason M, Wood G and Fletcher D. "Numerical Investigation of the Influence of Topography on Simulated Downburst Wind Fields.” Journal of Wind Engineering and Industrial Aerodynamics 98 (January 2010):21–33. doi:10.1016/j.jweia.2009.08.011.
[10] Vermeire B, Orf L and Savory E. "Improved Modelling of Downburst Outflows for Wind Engineering Applications Using A Cooling Source Approach.” Journal of Wind Engineering and Industrial Aerodynamics 99 (August 2011): 801–814. doi:10.1016/j.jweia.2011.03.003.
[11] Haitham A,Girma B and Ashraf E. "Turbulence Characterization of Downbursts Using LES.” Journal of Wind Engineering and Industrial Aerodynamics 136 (January 2015):44-61. doi:10.1016/j.jweia.2014.10.020.
[12] Honghai Li, Jingping Ou. "Simulation of Wind Pressure Distribution on The Surface of Buildings under Downburst.” engineering mechanics 28 (December 2011):147-151.
[13] Wenfu Zhang, Dan Xie, Yingchun Liu, Jing Ji. "The Spatial Correlation of Downburst Wind Field Simulation.” Journal of Vibration and Shock 10 (2013): 12-17. doi:10.13465/j.cnki.jvs.2013.10.026.
[14] Weilian Qu, Baifeng Ji, Jianqun Li, Jinwen Wang. "Simulation of Downburst Wind Numerical.” Earthquake engineering and Engineering Vibration 5 (2008):133-139.
[15] Zhiwei Peng. "Simulation of Downburst Wind Field and Numerical Effect on Flat Roof.” School of architecture and engineering, Zhejiang University (2008).
[16] Liu Z Q, Takeshi I, Xu H H, Niu H W. "LES Study on The Turbulent Flow Fields Over Complex Terrain Covered By Vegetation Canopy.” Journal of wind Engineering and Industrial Aerodynamics 155 (August 2016):60-73. doi:10.1016/j.jweia.2016.05.002.
[17] Mingde Su, Suyi Huang. "Calculation of Basic Fluid Mechanics.” Tsinghua University press (1997):6-10.
[18] Shehata A Y, El Damatty A A, Savory E. "Finite Element Modeling of Transmission Line under Downburst Wind Loading.” Finite elements in analysis and design 42 (October 2005): 71-89. doi:10.1016/j.finel.2005.05.005.
[19] Peng Ma. "Numerical Simulation of Downbursts Wind Field Based On FLUENT.” Shanxi Architecture 36 (2010):77-78.
[20] Xu Z, Hangan H. "Scale, Boundary and Inlet Condition Effects on Impinging Jets.” Journal of Wind Engineering and Industrial Aerodynamics 96 (December 2008):2383-2402. doi:10.1016/j.jweia.2008.04.002.
[21] Mason M. "Physical Simulation of Thunderstorm Downbursts.” Master's thesis, Lubbock (TX,USA):Texas Tech University (2003).
[22] Holmes, J.D. "Recent Developments in The Speciï¬cation of Wind Loads on Transmission Lines.” J. Wind Eng. 5 (2008): 8–18.
[23] Aboshosha H, Bitsuamlak G, Damatty A E. "Turbulence Characterization of Downbursts Using LES.” Journal of Wind Engineering & Industrial Aerodynamics 136 (January 2015): 44-61. doi:10.1016/j.jweia.2014.10.020.
[24] Kaimal, J.C., Finnigan, J.J. "Atmospheric Boundary Layer Flows - Their Structure and Measurements.” Oxford University Press,New York (1994).
[25] Ferziger, J., Peric, M. "Computational Method for Fluid Dynamics”, 3rd Edition, Springer (2002).
[26] Fluent Inc. "Fluent 6.3 User's Guide.” Fluent Inc., Lebanon (2006).
[27] Mason M S, Letchford C W, James D L. "Pulsed Wall Jet Simulation of A Stationary Thunderstorm Downburst, Part A: Physical Structure and Flow Field Characterization.” Journal of Wind Engineering & Industrial Aerodynamics 93 (July 2005): 557-580. doi:10.1016/j.jweia.2005.05.006.
[28] Mason M S, Wood G S. "Loading of A Very Tall Building in A Simulated Downburst Wind Field.” Structural Engineering (2004).
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