Выходит 18 номеров в год
ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561
Indexed in
APPLICATION OF TRIPLE DECOMPOSITION TECHNIQUE IN NEAR-WAKE MEASUREMENTS OF A SQUARE CYLINDER
Краткое описание
The flow properties and wake structures behind bluff bodies have fascinated researchers for many years. The Reynolds decomposition is a very common technique to approach these problems. However, some researchers tackle such problems with an alternative technique known as the triple decomposition. Since the flow structure of a bluff body comprises large-scale organized motion, the time-varying component in the wake region of a bluff-body flow consists of a periodic component (coherent structure) that can be distinguished from a random (incoherent) component. In the present study, incoherent turbulent flow structures in the near-wake region downstream of a square cylinder have been studied by employing triple decomposition. It was observed that the main incoherent turbulent kinetic energy production occurs in the region with the same width of square cylinder. Moreover, it was demonstrated that while a vortex is developing from one edge with maximum incoherent streamwise stress, the initiated shear layers from the other edge exhibit a maximum in incoherent transverse stress production.
-
Antonia, R., Browne, L., Bisset, D., and Fulachier, L., A Description of the Organized Motion in the Turbulent Far Wake of a Cylinder at Low Reynolds Number, J. Fluid Mech., vol. 184, pp. 423-444, 1987.
-
Baj, P., Bruce, P.J., and Buxton, O.R., The Triple Decomposition of a Fluctuating Velocity Field in a Multiscale Flow, Phys. Fluids, vol. 27, 075104, 2015.
-
Hacisevki, H. and Teimourian, A., Comparison of Flow Structures in the Wake Region of Two Similar Normal Flat Plates in Tandem and a Square Cylinder, Exp. Therm. Fluid Sci., vol. 69, pp. 169-177, 2015.
-
Hacisevki, H. and Teimourian, A., Interacting Wakes of a Narrow and a Wide Flat Plate in Tandem Arrangement, Fluid Dyn. Res, vol. 48, 015505, 2016.
-
Hussain, A., Coherent Structures and Turbulence, J. Fluid Mech., vol. 173, pp. 303-356, 1986.
-
Hussain, A., Coherent Structures-Reality and Myth, Phys. Fluids, vol. 26, pp. 2816-2850, 1983.
-
Irwin, P.A., Bluff Body Aerodynamics in Wind Engineering, J. Wind Eng. Ind. Aerodyn., vol. 96, pp. 701-712, 2008.
-
Kiya, M. and Matsumura, M., Incoherent Turbulence Structure in the Near Wake of a Normal Plate, J. Fluid Mech., vol. 190, pp. 343-356, 1988.
-
Lyn, D., Einav, S., Rodi, W., and Park, J.H., A Laser-Doppler Velocimetry Study of Ensemble-Averaged Characteristics of the Turbulent Near Wake of a Square Cylinder, J. Fluid Mech, vol. 304, pp. 285-319, 1995.
-
Reynolds, W. and Hussain, A., The Mechanics of an Organized Wave in Turbulent Shear Flow. Part 3. Theoretical Models and Comparisons with Experiments, J. Fluid Mech., vol. 54, pp. 263-288, 1972.
-
Rodi, W., On the Simulation of Turbulent Flow Past Bluff Bodies, J. Wind Eng. Ind. Aerodyn., vol. 46, pp. 3-19, 1993.
-
Saha, A.K., Muralidhar, K., and Biswas, G., Experimental Study of Flow Past a Square Cylinder at High Reynolds Numbers, Exp. Fluids, vol. 29, pp. 553-563, 2000.
-
Teimourian, A., Hacisevki, H., and Bahrami, A., Experimental Study on Flow Past Two Inclined Flat Plates in Tandem Arrangement, J. Wind Eng. Ind. Aerodyn., vol. 169, pp. 1-11, 2017.
-
Zdravkovich, M.M., Flow around Circular Cylinders: Vol. 1. Fundamentals, J. Fluid Mech., vol. 350, pp. 377-378, 1997.