آمار
| تعداد نشریات | 31 |
| تعداد شمارهها | 1,029 |
| تعداد مقالات | 9,100 |
| تعداد مشاهده مقاله | 10,289,976 |
| تعداد دریافت فایل اصل مقاله | 8,526,163 |
Computational Analysis of Turbulent Flow over a Bluff Body with Drag Reduction Devices | ||
| Journal of Applied and Computational Mechanics | ||
| مقاله 15، دوره 6، Special Issue، اسفند 2020، صفحه 1210-1219 اصل مقاله (1.71 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22055/jacm.2020.32667.2055 | ||
| نویسندگان | ||
| Adam Abikan؛ Zhiyin Yang* ؛ Yiling Lu | ||
| School of Computing and Engineering, College of Science and Engineering, University of Derby, Derby, UK | ||
| چکیده | ||
| Reducing aerodynamic drag of heavy trucks is crucially important for the reduction of fuel consumption and hence results in less air pollution. One way to reduce the aerodynamic drag is the deployment of drag reduction devices at the rear of trucks and this paper describes a numerical study of flow over a bluff body with rear drag devices using the Reynolds-Averaged-Navier-Stokes (RANS) approach to investigate the drag reduction mechanisms and also to assess accuracy of the RANS approach for this kind of flow. Four cases, a baseline case without any drag reduction devices and three cases with different drag reduction devices, have been studied and the predicted mean and turbulent quantities agree well with the experimental data. Drag reduction varies hugely from a few percent in one case to more than 40% in another case and detailed analysis of flow fields has been carried out to understand such a difference and to elucidate the drag reduction mechanism, which ultimately can lead to better design of future drag reduction devices. | ||
| کلیدواژهها | ||
| Aerodynamic drag؛ Bluff body؛ Drag reduction devices؛ Heavy vehicles | ||
| مراجع | ||
|
[1] Bearman, P., Bluff Body Flow Research with Application to Road Vehicles, In: Browand, F., McCallen, R., Ross, J., (eds) The Aerodynamics of Heavy Vehicles II: Trucks, Buses, and Trains, Springer, 2009.
[2] Bradley, R., Technology Roadmap for the 21st-Century Truck Program, Report for the US Department of Energy, Washington DC, Report no. 21CT-001. 2000.
[3] Ahmed, S.R., Influence of Base Slant on the Wake Structure and Drag of Road Vehicles, Journal of Fluids Engineering, 105, 1983, 429-434.
[4] Ahmed, S.R., Ramm, G., Faitin, G., Some Salient Features of the Time-Averaged Ground Vehicle Wake, SAE-TP-840300, 1984.
[5] Gillieron, P., Kourta, A., Aerodynamic Drag Reduction by Vertical Splitter Plates, Experiments in Fluids, 48, 2010, 1-16.
[6] Beaudoin, J., Aider, J., Drag and Lift Deduction of a 3D Bluff Body Using Flaps, Experiments in Fluids, 44, 2008, 491-501.
[7] Fourrie, G., Keirsbulck, L., Labraga, L., Gillieron, P., Bluff Body Drag Reduction Using a Deflector, Experiments in Fluids, 50, 2011, 385-395.
[8] Pujals, G., Depardon, S., Cossu, C., Drag Reduction of a 3D Bluff Body Using Coherent Streamwise Streaks, Experiments in Fuids, 49, 2010, 1085-1094.
[9] Bruneau, C., Creuse, E., Depeyras, D., Gillieron, P., Mortazavi, I., Coupling Active and Passive Techniques to Control the Flow past the Square Back Ahmed Body, Computer and Fluids, 39, 2010, 1875-1892.
[10] Bruneau, C., Creuse, E., Depeyras, D., Gillieron, P., Mortazavi, I., Active Procedures to Control the Flow past the Ahmed Body with a 250 Rear Window, International Journal of Aerodynamics, 1, 2011, 299-317.
[11] Wong, D., Mair, W., Boat-tailed after Bodies of Square Section as Drag-reduction Devices, Journal of Wind Engineering and Industrial Aerodynamics, 12, 1983, 229-235.
[12] Cooper, K.R., The Effect of Front-edge Rounding and Rear-edge Shaping on the Aerodynamic Drag of Bluff Vehicles in Ground Proximity, SAE Trans., 94, 1985, 727-757.
[13] Coon, J.D., Visser, K.D., Drag Reduction of a Tractor-trailer Using Planar Boat Tail Plates, In: McCallen, R., Browand, F., Ross, J., (eds), The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains, Springer, 2004, 249-265.
[14] Khalighi, B., Balkanyi, S.R., Bernal, L.P., Experimental Investigation of Aerodynamic Flow over a Bluff Body in Ground Proximity with Drag Reduction Devices, International Journal of Aerodynamics, 3, 2013, 217-233.
[15] Hassaan, M., Badlani, D., Nazarinia, M., On the Effect of Boat-tails on a Simplified Heavy Vehicle Geometry under Crosswinds, Journal of Wind Engineering and Industrial Aerodynamics, 183, 2018, 172-186.
[16] Kowata, S., Ha, J., Yoshioka, S., Kato, T., Kohama, Y., Drag Force Reduction of a Bluff Body with an Underbody Slant and Rear Flaps, SAE International Journal of Commercial Vehicles, 1, 2009, 230-236.
[17] Duell, E., George, A., Experimental Study of a Ground Vehicle Body Unsteady Near Wake, SAE Technical Paper, 1999-01-0812, 1999.
[18] Irving Brown, Y., Windsor, S., Gaylard, A., The Effect of Base Bleed and Rear Cavities on the Drag of an SUV, SAE Technical Paper, 2010-01-0512, 2010.
[19] Abikan, A., Lu, Y., Yang, Z., Numerical Study of Flow over a Bluff Body with Drag Reduction Devices, Proceedings of the World Congress on Mechanical and Mechatronics Engineering, Dubai, 16th-17th April 2018.
[20] Worth, N., Yang, Z., Simulation of an Impinging Jet in a Crossflow Using a Reynolds Stress Transport Model, International Journal for Numerical Methods in Fluids, 52, 2006, 199-211.
[21] Ostheimer, D., Yang, Z., A CFD Study of Twin Impinging Jets in a Cross-flow, The Open Numerical Methods Journal, 4, 2012, 24-34.
[22] Yang, Z., Assessment of Unsteady-RANS Approach against Steady-RANS Approach for Predicting Twin Impinging Jets in a Cross-flow, Cogent Engineering, 1, 2014, 936995.
[23] Daly, B.J., Harlow, F.H., Transport Equations in Turbulence, Physics of Fluids, 13, 1970, 2634-2649.
[24] Gibson, M.M., Launder, B.E., Ground Effects on Pressure Fluctuations in the Atmospheric Boundary Layer, Journal of Fluid Mechanics, 86, 1978, 491–511. | ||
|
آمار تعداد مشاهده مقاله: 617 تعداد دریافت فایل اصل مقاله: 639 |
||