Experiment

Results are presented from a towing-tank experiment of 3D separation and free-surface turbulence to provide detailed documentation of the flow appropriate both for explicating the flow physics and validating computational methods.  The model is NACA24 which is a 1.2 m chord length, vertical, surface-piercing hydrofoil.  The data includes far and near field wave elevations, surface pressures, and wave profiles on the hull at three Froude numbers (Fr = 0.19, 0.37, 0.55).

Data, equipment, and conditions

Sample image

Front-quarter view of the bow flow around the NACA24 shows a sharp wave elevation increase at x / c = 0, separated flow downsteam of the bow wave, and significant free-surface turbulence

Sample data

Near and far field wave elevation contours for Fr = 0.37

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NACA24

References

Abbott, I.H. and Von Doenhoff, A.E., (1959), "Theory of Wing Sections," Dover Publications Inc., New York, 693 pp.

Zhang, Z. and Stern, F., (1996), "Free-Surface Wave-Induced Separation," ASME J. Fluids Eng., Vol. 118, pp. 546-554.  (pdf)

Kandasamy, K., Wilson, R., and Stern, F., (2001), "Unsteady RANS Simulation of Free-Surface Wave-Induced Separation," Proc. 26th ATTC, Webb Institute, Glen Cove, N.Y.  (pdf)

Metcalf, B., Longo, J., and Stern, F., (2001), "Experimental Investigation of Wave-Induced Separation Around a Surface-Piercing Hydrofoil," Proc. 26th ATTC, Webb Institute, Glen Cove, N.Y.  (pdf)

Metcalf, B., (2001), "Experimental Investigation of Free-Surface Wave-Induced Separation Around A Surface-Piercing NACA0024 Hydrofoil," M.S. thesis, Department of Mechanical Engineering, The University of Iowa, Iowa City, IA., 143pp.

Metcalf, B., Longo, J., Ghosh, S., and Stern, F., (2006), "Unsteady free-surface wave-induced boundary-layer separation for a surface-piercing NACA 0024 foil: Towing tank experiments," J. Fluids & Structures, Vol. 22, pp. 77-98.  (pdf)

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