Numerical Investigation of an Innovative Windbreak Design with Jet Flow Generated by an Air Curtain for Half-pipe Skiing

Liu, K.; Liu, F.; Liu, Q.

doi:10.47176/jafm.17.6.2400

Numerical Investigation of an Innovative Windbreak Design with Jet Flow Generated by an Air Curtain for Half-pipe Skiing

Document Type : Regular Article

Authors

K. Liu ¹^{, 2}^{, 3}
F. Liu ²
Q. Liu ¹^{, 2}^{, 3}

¹ State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang, Hebei, 050043, China

² School of Civil Engineering, Shijiazhuang Tiedao University, China

³ Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province, China

10.47176/jafm.17.6.2400

Abstract

The sport of half-pipe skiing, characterized by its dynamic maneuvers and high-speed descents, often faces challenges posed by unpredictable wind conditions. To address this, an advanced wind-blocking system incorporating an air curtain capable of generating a jet flow is proposed. This pioneering design offers a dual advantage: the system can significantly reduce the windbreak size in the vertical dimension while maintaining a satisfactory wind-blocking effect. A comprehensive study is conducted to analyze the effects of the height of the windbreak and the jet emission angle from the air curtain. When the jet speed is 40 m/s, a 50° emission angle and a 2 m height of the windbreak result in an optimal wind-blocking effect. Furthermore, delving deeper to understand the underpinnings of this phenomenon, we discovered that a counterrotating vortex pair, which forms in the presence of this jet under crossflow conditions, plays a pivotal role in augmenting the wind-blocking capabilities of the system.

Keywords

Main Subjects

Computational Fluid Dynamics

References

Bidan, G., & Nikitopoulos, D. E. (2013). On steady and pulsed low-blowing-ratio transverse jets. Journal of Fluid Mechanics, 714, 393–433. https://doi.org/10.1017/jfm.2012.482

Bushnell, H. (2023). Wind-related injury count reaches double digits at PyeongChang Olympics. Yahoo Sport. (accessed 03-29, 2023)

Cambonie, T., & Aider, J. L. (2014). Transition scenario of the round jet in crossflow topology at low velocity ratios. Physics of Fluids, 26, 084101. https://doi.org/10.1063/1.4891850

Cambonie, T., Gautier, N., & Aider, J. L. (2013). Experimental study of counter-rotating vortex pair trajectories induced by a round jet in cross-flow at low velocity ratios. Experiments in Fluids, 54, 1475. https://doi.org/10.1007/s00348-013-1475-9

Cameron, R. W. F., Taylor, J., & Emmett, M. (2015). A Hedera green façade – Energy performance and saving under different maritime-temperate, winter weather conditions. Building and Environment, 92, 111–121. https://doi.org/10.1016/j.buildenv.2015.04.011

Chu, C. R., Chang, C. Y., Huang, C. J., Wu, T. R., Wang, C. Y., & Liu, M. Y. (2013). Windbreak protection for road vehicles against crosswind. Journal of Wind Engineering and Industrial Aerodynamics, 116, 61–69. https://doi.org/10.1016/j.jweia.2013.02.001

Dai, C., Jia, L., Zhang, J., Shu, Z., & Mi, J. (2016). On the flow structure of an inclined jet in crossflow at low velocity ratios. International Journal of Heat and Fluid Flow, 58, 11–18. https://doi.org/10.1016/j.ijheatfluidflow.2015.12.001

Dai, C., Shu, Z., & Mi, J. (2019). Quantitative investigation on the formation of counter-rotating vortex pairs from the inclined jet in crossflow. Fluid-Structure-Sound Interactions and Control: Proceedings of the 4th Symposium on Fluid-Structure-Sound Interactions and Control. https://doi.org/10.1007/978-981-10-7542-1_19

Dong, Z., Luo, W., Qian, G., & Wang, H. (2007). A wind tunnel simulation of the mean velocity fields behind upright porous fences. Agricultural and Forest Meteorology, 146, 82–93. https://doi.org/10.1016/j.agrformet.2007.05.009

Fang, H., Wu, X., Zou, X., Yang, X. (2018). An integrated simulation-assessment study for optimizing wind barrier design. Agricultural and Forest Meteorology, 263, 198–206. https://doi.org/10.1016/j.agrformet.2018.08.018

Fu, Z., & Li, Q. (2023). Study on Wind-Proof Effect and Stability of Windbreak Fence in Alpine Skiing Center. Sustainability, 3369. https://doi.org/10.3390/su15043369

Gevorkyan, L., Shoji, T., Peng, W., & Karagozian, A. (2018). Influence of the velocity field on scalar transport in gaseous transverse jets. Journal of Fluid Mechanics, 834, 173–219. https://doi.org/10.1017/jfm.2017.621

Gillies, J. A., Etyemezian, V., Nikolich, G., Glick, R., Rowland, P., Pesce, T., & Skinner, M. (2017). Effectiveness of an array of porous fences to reduce sand flux: Oceano Dunes, Oceano CA. Journal of Wind Engineering and Industrial Aerodynamics, 168, 247–259. https://doi.org/10.1016/j.jweia.2017.06.015

Hamlet, M. P. (1988). Army Research Inst Of Environmental Medicine Natick Ma Natick. Winter sports medicine, (p.0022)

Heisler, G. M. (1991). Computer simulation for optimizing windbreak placement to save energy for heating and cooling buildings. https://www.semanticscholar.org/paper/Computer-simulation-for-optimizing-windbreak-to-for-Heisler/ee64d7f83df7d74047bddf6f6f680f4788b25895

Jiang, X., Yin, Z., & Cui, H. (2019). Wind tunnel tests of wind-induced snow distribution for cubes with holes. Advances in Civil Engineering, 2019, 1–12. https://doi.org/10.1155/2019/4153481

Jones, M., & Yamaleev, N. (2012). The effect of a gust on the flapping wing performance. 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. American Institute of Aeronautics and Astronautics, Nashville, Tennessee. https://doi.org/10.2514/6.2012-1080

Klotz, L., Goujon-Durand, S., Rokicki, J., & Wesfreid, J. E. (2014). Experimental investigation of flow behind a cube for moderate Reynolds numbers. Journal of Fluid Mechanics, 750, 73–98. https://doi.org/10.1017/jfm.2014.236

Klotz, L., Gumowski, K., & Wesfreid, J. E. (2019). Experiments on a jet in a crossflow in the low-velocity-ratio regime. Journal of Fluid Mechanics, 863, 386–406. https://doi.org/10.1017/jfm.2018.974

Li, B., & Sherman, D. J. (2015). Aerodynamics and morphodynamics of sand fences: A review. Aeolian Research, 17, 33–48. https://doi.org/10.1016/j.aeolia.2014.11.005

Li, W., Wang, F., & Bell, S. (2007). Simulating the sheltering effects of windbreaks in urban outdoor open space. Journal of Wind Engineering and Industrial Aerodynamics, 95, 533–549. https://doi.org/10.1016/j.jweia.2006.11.001

Liu, K., Yu, M., & Zhu, W. (2019). Enhancing wind energy harvesting performance of vertical axis wind turbines with a new hybrid design: A fluid-structure interaction study. Renewable Energy, 140, 912–927. https://doi.org/10.1016/j.renene.2019.03.120

Mahesh, K. (2013). The Interaction of jets with crossflow. Annual Review of Fluid Mechanics, 45, 379–407. https://doi.org/10.1146/annurev-fluid-120710-101115

Margason, R. J. (1993). Fifty years of jet in cross flow research. AGARD.

Mullin, E. (2023). Aaron Blunck Ends Halfpipe With Frightening Fall, David Wise Races Up Hill to Help. https://www.nbcsports.com/chicago/beijing-2022-winter-olympics/aaron-blunck-ends-halfpipe-frightening-fall-david-wise-races

Nair, V., Krishnan, A., Adhikari, S., Lieuwen, T.C. (2023). Influence of mixture composition and radial flame location on counter-rotating vortex pair evolution in a reacting jet in crossflow. AIAA SCITECH 2023 Forum 0344. https://doi.org/10.2514/6.2023-0344

Nair, V., Sirignano, M., Emerson, B., Halls, B., Jiang, N., Felver, J., Roy, S., Gord, J., & Lieuwen, T. (2019). Counter rotating vortex pair structure in a reacting jet in crossflow. Proceedings of the Combustion Institute, 37, 1489–1496. https://doi.org/10.1016/j.proci.2018.06.059

Nanda, S. (2012). Preventing cold injuries: Winter safety tips. Consultant 360, 11(12).

New, T. H., Lim, T. T., & Luo, S. C. (2006). Effects of jet velocity profiles on a round jet in cross-flow. Experiments in Fluids, 40, 859–875. https://doi.org/10.1007/s00348-006-0124-y

Park, C. W., & Lee, S. J. (2003). Experimental study on surface pressure and flow structure around a triangular prism located behind a porous fence. Journal of Wind Engineering and Industrial Aerodynamics, 91, 165–184. https://doi.org/10.1016/S0167-6105(02)00343-4

Perrotta, G., & Jones, A. R. (2017). Unsteady forcing on a flat-plate wing in large transverse gusts. Experiments in Fluids, 58, 101. https://doi.org/10.1007/s00348-017-2385-z

Poudel, N., Yu, M., & Hrynuk, T. (2021). Gust mitigation with an oscillating airfoil at low Reynolds number. Physics of Fluids, 33, 101905. https://doi.org/10.1063/5.0065234

Rana, Z. A., Thornber, B., & Drikakis, D. (2011). Transverse jet injection into a supersonic turbulent cross-flow. Physics of Fluids, 23, 046103. https://doi.org/10.1063/1.3570692

Recker, E., Bosschaerts, W., Wagemakers, R., Hendrick, P., Funke, H., & Börner, S. (2010). Experimental study of a round jet in cross-flow at low momentum ratio. 15th International Symposium on Applications of Laser Techniques to Fluid Mechanics Lisbon 05–08.

Regan, M. A., & Mahesh, K. (2017). Global linear stability analysis of jets in cross-flow. Fluid Mech, 828, 812–836. https://doi.org/10.1017/jfm.2017.489

Sau, R., & Mahesh, K. (2008). Dynamics and mixing of vortex rings in crossflow. Journal of Fluid Mechanics, 604, 389–409. https://doi.org/10.1017/S0022112008001328

Smith, S. H., & Mungal, M. G. (1998). Mixing, structure and scaling of the jet in crossflow. Journal of Fluid Mechanics, 357, 83–122. https://doi.org/10.1017/S0022112097007891

Suresh, S. (2006). Winter sports injuries: patterns of injury--preventive measures. Contemporary Pediatrics, 5(3).

Tominaga, Y., & Shirzadi, M. (2022). RANS CFD modeling of the flow around a thin windbreak fence with various porosities: Validation using wind tunnel measurements Journal of Wind Engineering and Industrial Aerodynamics,230, 105176 https://doi.org/10.1016/j.jweia.2022.105176

TRTWorld (2023). Injuries and chaos as icy winds disrupt events at Pyeongchang Games. https://www.trtworld.com/sport/injuries-and-chaos-as-icy-winds-disrupt-events-at-pyeongchang-games-15100(accessed 03-29, 2023)

Viti, V., Neel, R., & Schetz, J. A. (2009). Detailed flow physics of the supersonic jet interaction flow field. Physics of Fluids, 21, 046101. https://doi.org/10.1063/1.3112736

Zhang, X., Tse, K. T., Weerasuriya, A. U., Li, S. W., Kwok, K. C. S., Mak, C. M., Niu, J., & Lin, Z. (2017). Evaluation of pedestrian wind comfort near ‘lift-up’ buildings with different aspect ratios and central core modifications. Building and Environment, 124, 245–257. https://doi.org/10.1016/j.buildenv.2017.08.012

Zhao, Z., Wang, S., Tang, X., Song, J., & Wang, Z. (2022). Large eddy simulation of compound angle film cooling with vortex generators. International Journal of Thermal Sciences, 178, 107611. https://doi.org/10.1016/j.ijthermalsci.2022.107611

Zhu, S., Gao, N., & Ye, Y. (2022). Numerical simulation to assess the impact of urban green infrastructure on building energy use: A review. Building and Environment, 109832 https://doi.org/10.1016/j.buildenv.2022.109832