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Journal of Flow Visualization and Image Processing
FLOW VISUALIZATION OF SMOKE SCREEN FORMATION FOR A RECTANGULAR VEHICLE IN DYNAMIC MOTION
Graduate School of Defense Science Studies, Chung Cheng Institute of Technology National Defense University, Taoyuan, 335, Taiwan, R.O.C.
Department of Materials Engineering, National PingTung University of Science & Technology, Shuefu Road, Neipu, Pingtung, Taiwan.
This study uses computational fluid dynamics (CFD) and the dynamics mesh technique to simulate and visualize the unsteady vortex shedding of a smoke screen produced by a smoke-generating vehicle in dynamic motion. The effects of atmospheric wind speed and the speed of the smoke-generating vehicle on the smoke screen transport phenomena are examined. In this study, the smoke screen is released from the base of the vehicle as two parallel jets with a ratio of centerline spacing to nozzle diameter equal to 52. Once the smoke concentrations are obtained from the numerical results, the Bouger-Lambert law is applied to calculate the percentage of visibility degradation at particular axial positions.
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