Abstract
This paper presents comparisons between flow fields for turbulent flow over square cylinder with two different angles of incidence in free stream at Reynolds number of Re = 3400. The present numerical results were obtained using a two-dimensional finite-volume code which solves governing equations. The pressure field was obtained with well known SIMPLE algorithm. The central difference scheme was employed for the discretization of convection and diffusion terms. The ν2 f and standard k - e model were used for simulation of turbulent flow. Time averaged velocity, root mean square velocities and streamlines in the downstream of square cylinders are presented. A number of quantities such as Strouhal number, drag coefficient and the length of the wake are calculated for the case of angle of incidence α = 0°, 45° with two turbulent models. Strouhal number and the length of the wake are larger for the case of α = 45° because of the sharp corners in it which results in more diffusion of turbulence in the downstr...
Highlights
The flow around slender cylindrical bluff bodies has been the subject of intense research in the past, mostly by experiments but recently by using numerical simulation
In order to evaluate the influences of grid system on the results, three grid systems were used in the calculation of square cylinder with the angle of incidence of zero
The grid system used in this study for the case of square cylinder with the angle of incidence of α = 45° is shown in Fig. (2)
Summary
The flow around slender cylindrical bluff bodies has been the subject of intense research in the past, mostly by experiments but recently by using numerical simulation. This flow situation is popular because of its academic attractiveness and owing to its related technical problems associated with energy conservation and structural design. A time-periodic oscillation develops at some critical onset Reynolds number Recr. This is the Benard von Karman instability. Periodic vortex shedding patterns and fluctuating velocity fields behind the bluff bodies can cause structural damage as a result of periodic surface loading, acoustic noise and drag forces [1,2]
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