EFFECT OF RIGID AND FLEXIBLE SPLITTER PLATE ATTACHED TO SQUARE CYLINDER ON STROUHAL NUMBER AT MODERATE REYNOLDS NUMBER

2018 ◽  
Author(s):  
Kamal Raj Sharma ◽  
Sushanta Dutta
Keyword(s):  
Reynolds Number ◽  
Strouhal Number ◽  
Splitter Plate ◽  
Square Cylinder ◽  
Moderate Reynolds Number

The sound generated by a square cylinder with a splitter plate at low Reynolds number

2011 ◽  
Vol 330 (15) ◽  
pp. 3620-3635 ◽  
Author(s):  
Mohamed Sukri Mat Ali ◽  
Con J. Doolan ◽  
Vincent Wheatley
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Splitter Plate ◽  
Square Cylinder ◽  
Low Reynolds

Strouhal number of flat and flapped plates at moderate Reynolds number and different angles of attack: experimental data

2018 ◽  
Vol 230 (1) ◽  
pp. 333-349 ◽  
Author(s):  
Ali Bakhshandeh Rostami ◽  
Mohammad Mobasheramini ◽  
Antonio Carlos Fernandes
Keyword(s):  
Experimental Data ◽  
Reynolds Number ◽  
Strouhal Number ◽  
Moderate Reynolds Number

Vortex shedding behind a square cylinder in transonic flows

1987 ◽  
Vol 178 ◽  
pp. 303-323 ◽  
Author(s):  
Takeo Nakagawa
Keyword(s):  
Reynolds Number ◽  
Mach Number ◽  
Shock Waves ◽  
Strouhal Number ◽  
Vortex Shedding ◽  
Acoustic Waves ◽  
Strong Shock ◽  
Square Cylinder ◽  
Number Range ◽  
Reynolds Number Range

This paper is primarily concerned with Mach-number effects on the vortex shedding behind a square cylinder (side length D = 20 mm) in a Reynolds-number range of 0.696 × 105 < Re < 4.137 × 105, and a Mach-number range of 0.1522 < M < 0.9049.Regular periodic vortex shedding is present, irrespective of the appearance of shock waves around a square cylinder. The shape of the vortices is, however, deformed by the shock waves, and each vortex centre becomes non-uniform while the vortex passes through the gap between the upper and lower shock waves. Weak shock waves around the square cylinder do not alter the Strouhal number, but strong shock waves weaken the vortex shedding and increase the Strouhal number suddenly. Acoustic waves have been recorded by the Mach-Zehnder interferometer when the Mach number is close to the critical value. The acoustic waves are generated most strongly at the instant when each vortex hits the foot of the shock waves formed above and below the vortex formation region.From the present work and that of Okajima (1982), it is suggested that the Strouhal number of alternating vortices shed from a square cylinder can be estimated to be about 0.13 in the Reynolds-number range between 102 and 3.4 × 105.

Numerical study of the rounded corners effect on flow past a square cylinder

2015 ◽  
Vol 25 (4) ◽  
pp. 686-702 ◽  
Author(s):  
Sajjad Miran ◽  
Chang Hyun Sohn
Keyword(s):  
Reynolds Number ◽  
Drag Coefficient ◽  
Strouhal Number ◽  
Lift Coefficient ◽  
Numerical Results ◽  
The Body ◽  
Square Cylinder ◽  
Content Type ◽  
Flow Past ◽  
Corner Radius

Purpose – The purpose of this paper is to numerically investigate the influence of corner radius on flow past a square cylinder at a Reynolds number 500. Design/methodology/approach – Six models were studied, for R/D=0 (square cylinder), 0.1, 0.2, 0.3, 0.4, and 0.5 (circular cylinder), where R is the corner radius and D is the characteristic dimension of the body. The transient two-dimensional (2D) laminar and large eddy simulations (LES) models were employed using finite volume code. The Strouhal number, mean drag coefficient (CD), and root mean square (RMS) value of lift coefficient (CL,RMS), for different R/D values, were computed and compared with experimental and other numerical results. Findings – The computational results showed good agreement with previously published results for a Reynolds number, Re=500. It was found that the corner effect on a square cylinder greatly influences the flow characteristics around the cylinder. Results indicate that, as the corner radius ratio, R/D, increases, the Strouhal number increases rapidly for R/D=0-0.2, and then gradually rises between R/D=0.2 and 0.5. The minimum values of the mean drag coefficient and the RMS value of lift coefficient were found around R/D=0.2, which is verified by the time averaged streamwise velocity deficit profile. Originality/value – On the basis of the numerical results, it is concluded that rounded corners on a square cylinder are useful in reducing the drag and lift forces generated behind a cylinder. Finally, it is suggested that with a rounded corner ratio of around R/D=0.2, the drag and oscillation of the cylinder can be greatly reduced, as compared to circular and square cylinders.

Experimental investigation of flow over a square cylinder with an attached splitter plate at intermediate reynolds number

2018 ◽  
Vol 76 ◽  
pp. 319-335 ◽  
Author(s):  
Manish Kumar Chauhan ◽  
Sushanta Dutta ◽  
Bhupendra Singh More ◽  
Bhupendra Kumar Gandhi
Keyword(s):  
Experimental Investigation ◽  
Reynolds Number ◽  
Splitter Plate ◽  
Square Cylinder

Low Reynolds number flow over a square cylinder with a splitter plate

2011 ◽  
Vol 23 (3) ◽  
pp. 033602 ◽  
Author(s):  
Mohamed Sukri Mat Ali ◽  
Con J. Doolan ◽  
Vincent Wheatley
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Splitter Plate ◽  
Square Cylinder ◽  
Low Reynolds Number Flow ◽  
Reynolds Number Flow ◽  
Number Flow ◽  
Low Reynolds

Effects of Corner Cutoffs on Flow Past Two Square Cylinders in a Tandem Arrangement

2012 ◽  
Author(s):  
Y. T. Krishne Gowda ◽  
H. V. Ravindra ◽  
C. K. Vikram
Keyword(s):  
Reynolds Number ◽  
Pressure Distribution ◽  
Strouhal Number ◽  
Vortex Shedding ◽  
Lift Coefficient ◽  
Two Dimensional ◽  
Square Cylinder ◽  
Tandem Arrangement ◽  
Square Cylinders ◽  
Flow Past

Flow past the two square cylinders with and without corner modification in a tandem arrangement has been simulated using a CFD code FLUENT. A Reynolds number of 100 and pitch to perimeter ratios (PPR) of 2,4 and 6 are considered for the investigation. The flow is assumed to be two dimensional unsteady and incompressible. The obtained results are presented in the form of streamlines, pressure distribution, monitored velocity, lift coefficient and Strouhal number. Results indicate, in case of chamfered and rounded corners, there is decrease in the wake width and thereby the lift values. For the square cylinders of same perimeters with and without corner modification, the size of the eddy and the monitored velocity in between the square cylinders increases with increase in PPR. Frequency of vortex shedding is same in between the cylinders and in the downstream of the cylinder. Frequency of vortex shedding decreases with the introduction of second cylinder either in the upstream or downstream of the first cylinder. The lift coefficient of square cylinder with corner modification decreases but Strouhal number increases when compared with a square cylinder without corner modification.

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