Research Papers: CFD and VIV

Turbulent Flow Around a Semi-Submerged Rectangular Cylinder

[+] Author and Article Information
Tufan Arslan

Department of Marine Technology,
Norwegian University of Science and Technology,
Trondheim 7491, Norway
e-mail: tufan.arslan@ntnu.no

Stefano Malavasi

Department of Civil and Environmental
Engineering, Politecnico di Milano,
Milan 20133,Italy
e-mail: stefano.malavasi@polimi.it

Bjørnar Pettersen

Department of Marine Technology,
Norwegian University of Science and Technology,
Trondheim 7491,Norway
e-mail: bjornar.pettersen@ntnu.no

Helge I. Andersson

Department of Energy and Process Engineering,
Norwegian University of Science and Technology,
Trondheim 7491,Norway
e-mail: helge.i.andersson@ntnu.no

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received March 27, 2012; final manuscript received July 10, 2013; published online September 27, 2013. Assoc. Editor: Sergio H. Sphaier.

J. Offshore Mech. Arct. Eng 135(4), 041801 (Sep 27, 2013) (11 pages) Paper No: OMAE-12-1032; doi: 10.1115/1.4025144 History: Received March 27, 2012; Revised July 10, 2013

The present work is motivated by phenomena occurring in the flow field around structures partly submerged in water. A three-dimensional (3D) unsteady flow around a rectangular cylinder is studied for four different submergence ratios by using computational fluid dynamics (CFD) tools with the large eddy simulation (LES) turbulence model. The simulation results are compared to particle image velocimetry (PIV) measurements at the Reynolds number Re = 12,100 and the Froude number Fr = 0.26. The focus in our investigation is on the characterization of the behavior of vortex structures generated by separated flow. Another target in the study is to obtain a better knowledge of the hydrodynamic forces acting on a semi-submerged structure. The computed force coefficients are compared with experimental measurements.

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Fig. 1

Sketch of the geometric parameters

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Fig. 2

The 3D computational domain with boundary surfaces and its boundary conditions

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Fig. 3

Cross section of the 3D computational mesh (MESH-1) showing details at the corner (upper right)

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Fig. 4

Cross section of the experimental setup and measurement plane for the PIV data shown

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Fig. 5

The PIV measuring setup

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Fig. 6

A single image of the seeded flow from the measurement plane [40]

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Fig. 7

Force measurement part of the physical model. Side view (left) and back view (right).

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Fig. 8

Mean streamlines for different submergence ratios (h*). The figures at the top with black lines are the CFD calculations and the blue lines at the bottom are from the PIV measurements (PIV data for h* = 0.2 is not available).

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Fig. 9

Mean streamwise velocity. Calculated (top) and measured (bottom) for h* = 0.4.

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Fig. 10

Mean vertical velocity. Calculated (top) and measured (bottom) for h* = 0.4.

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Fig. 11

(a) Predicted and measured drag and (b) buoyancy excluded lift force coefficients versus submergence ratios (h*)

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Fig. 12

Total lift force coefficient including buoyancy

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Fig. 13

Power spectra of the lift coefficient for the experimental results for (a) h* = 0.4, and (b) h* = 0.8

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Fig. 14

Power spectra of the lift coefficients for the numerical results for (a) h* = 0.4, and (b) h* = 0.8

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Fig. 15

Strouhal numbers for the numerical results

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Fig. 16

Strouhal numbers as a function of the aspect ratio (l/s)

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Fig. 17

Calculated mean streamlines for (a) MESH-1, and (b) MESH-2; h* = 0.4

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Fig. 18

Calculated mean drag and total lift coefficients versus mesh size, h* = 0.4

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Fig. 19

Free surface deformation (numerical results)

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Fig. 20

Mean streamlines: free-slip boundary condition (top) and VOF method (bottom); h* = 0.4




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