Abstract
The three-dimensional wind velocity and dynamic pressure for stationary tornado-like vortices that developed over ground of different roughness categories were investigated to clarify the effects of ground roughness. Measurements were performed for various roughness categories and two swirl ratios. Variations of the vertical and horizontal distributions of velocity and pressure with roughness are presented, with the results showing that the tangential, radial, and axial velocity components increase inside the vortex core near the ground under rough surface conditions. Meanwhile, clearly decreased tangential components are found outside the core radius at low elevations. The high axial velocity inside the vortex core over rough ground surface indicates that roughness produces an effect similar to a reduced swirl ratio. In addition, the pressure drop accompanying a tornado is more significant at elevations closer to the ground under rough compared with smooth surface conditions. We show that the variations of the flow characteristics with roughness are dependent on the vortex-generating mechanism, indicating the need for appropriate modelling of tornado-like vortices.
Similar content being viewed by others
References
Bienkiewicz B, Dudhia P (1993) Physical modelling of tornado-like flow and tornado effects on building loading. In: Proceedings of the seventh US National Conference on wind engineering, pp 95–104
Cao S, Wang J (2013) Statistical summary and case studies of strong wind damage in China. J Disaster Res 8(6):1096–1102
Cao S, Wang J, Cao J, Zhao L, Chen X (2015) Experimental study of wind pressures acting on a cooling tower exposed to stationary tornado-like vortices. J Wind Eng Ind Aerodyn 145:75–86
Chang CC (1971) Tornado wind effects on buildings and structures with laboratory simulation. Proceedings of the third international conference on wind effects on buildings and structures. Tokyo, Japan, pp 231–240
Church CR, Snow JT, Baker GL, Agee EM (1979) Characteristics of tornado-like vortices as a function of swirl ratio: a laboratory investigation. J Atmos Sci 36:1755–1766
Cleland JD (2001) Laboratory measurements of velocity profiles in simulated tornado-like vortices. J Undergrad Res Phys 18:51–57
Dessens JJ (1972) Influence of ground roughness on tornadoes: a laboratory simulation. J Appl Meteorol 11(1):72–75
Haan FL, Sarkar PP, Gallus WA (2008) Design, construction and performance of a large tornado simulator for wind engineering applications. Eng Struct 30:1146–1159
Haan FL, Balaramudu VK, Sarkar PP (2010) Tornado-induced wind loads on a low-rise building. Struct Eng 136:106–116
Hu H, Yang Z, Sarkar P, Haan FL (2011) Characterization of the wind loads and flow fields around a gable-roof building model in tornado-like winds. Exp Fluids 51(3):835–851
Kuai L, Haan FL, Gallus WA (2008) CFD simulations of the flow field of a laboratory-simulated tornado for parameter sensitivity studies and comparison with field measurements. Wind Struct 11(2):75–96
Lee WC, Wurman J (2005) Diagnosed three-dimensional axisymmetric structure of the Mulhall tornado on 3 May 1999. J Atmos Sci 62(7):2373–2393
Lee JJ, Samaras T, Young CR (2004) Pressure measurements at the ground in an F-4 tornado. In: Preprints of the 22nd conference on severe local storms, Hyannis, MA. American Meteorological Society, Boston
Leslie FW (1977) Surface roughness effects on suction vortex formation: a laboratory simulation. J Atmos Sci 34(7):1022–1027
Lewellen WS, Sheng YP (1979) Influence of surface conditions on tornado wind distribution. In: Proceedings of the 11th conference on severe local storms, Kansas City. American Meteorological Society, Boston, pp 375–378 (Preprints)
Matsui M, Tamura Y (2009) Influence of incident flow conditions on generation of tornado-like flow. In: Proceedings of the 11th American conference on wind engineering, Puerto Rico
Metzger RS, Weiss CC (2010) An Examination of the Vertical Structure of two tornadoes using Ka-band mobile Doppler radar. In: 25th Conference on severe local storms (Preprints). American Meteorological Society, Boston
Mishra AR, James DJ, Letchford CW (2008) Physical simulation of a single-celled tornado-like vortex, part A. Flow field characterization. J Wind Eng Ind Aerodyn 96:1243–1257
Mitsuta Y, Monji N (1984) Development of a laboratory simulator for small scale atmospheric vortices. Nat Disaster Sci 6(1):43–53
Natarajan D, Hangan H (2009) Numerical study on the effects of surface roughness on tornado-like flows. In: Proceedings of the 11th Americas conference on wind engineering, Puerto Rico
Natarajan D, Hangan H (2012) Large eddy simulations of translation and surface roughness effects on tornado-like vortices. J Wind Eng Ind Aerodyn 104:577–584
Neakrase LD, Greeley R (2010) Dust devils in the laboratory: effect of surface roughness on vortex dynamics. J Geophys Res 115(E5):E05003
Raupach MR, Antonia RA, Rajagopalan S (1991) Rough-wall turbulent boundary layers. Appl Mech Rev 44:1–25
Refan M, Hangan H (2016) Characterization of tornado-like flow fields in a new model scale wind testing chamber. J Wind Eng Ind Aerodyn 151:107–121
Rotunno R (1979) A study in tornado-like vortex dynamics. J Atmos Sci 36:140–155
Roueche D, Prevatt DO (2013) Residential damage patterns following the 2011 Tuscaloosa, AL and Joplin. MO tornadoes. J Disaster Res 8(6):1061–1067
Sabareesh GR, Matsui M, Tamura Y (2013) Characteristics of internal pressures and net local roof wind forces on a building exposed to a tornado-like vortex. J Wind Eng Ind Aerodyn 112:52–57
Sengupta A, Haan FL, Sarkar PP (2008) Translating loads on buildings in microburst and tornado winds. J Wind Eng Ind Aerodyn 96:2173–2187
Snow JT, Church CR, Barnhart BJ (1980) An investigation of the surface pressure fields beneath simulated tornado cyclones. J Atmos Sci 37:1013–1026
Tamura Y, (representative), (2007) Report of investigation of serious tornado damage in Saroma-cho. Hokkaido, Grant-in-Aid for Scientific Research (in Japanese)
Tamura T, Cao S, Ohno O, Okuda Y, Okada H, Yamauchi H (2003) LES estimation on wind profile in the urban area—comparison with the observation data during typhoon. In: Proceedings of the 11th international conference on wind engineering, Lubbock, pp 2697–2704
Ward NB (1972) The exploration of certain features of tornado dynamics using a laboratory model. J Atmos Sci 29:1194–1204
Wilkins EM, Sasaki Y, Johnson HL (1975) Surface friction effects on thermal convection in a rotating fluid: a laboratory simulation. Mon Weather Rev 103(4):305–317
Wurman J, Alexander CR (2005) The 30 May 1998 Spencer, South Dakota, storm. Part II: comparison of observed damage and radar-derived winds in the tornadoes. Mon Weather Rev 133(1):97–119
Zhang W, Sarkar PP (2008) Effects of ground roughness on tornado like vortex using PIV. In: Proceedings of the AAWE workshop, Vail, CO
Acknowledgments
The authors would like to thank the reviewers, whose constructive comments led to an improved paper. This research was funded in part by Natural Science Foundation of China (NSFC) grant no. 51478358 and Research Foundation of State Key Laboratory of Disaster Reduction in Civil Engineering grant no. SLDRCE14-A-01. The first author greatly appreciates the Double-PhD Degree Program between Tongji University in China and Clemson University in the USA.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Wang, J., Cao, S., Pang, W. et al. Experimental Study on Effects of Ground Roughness on Flow Characteristics of Tornado-Like Vortices. Boundary-Layer Meteorol 162, 319–339 (2017). https://doi.org/10.1007/s10546-016-0201-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10546-016-0201-6