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

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Sample image

Experimental setup for the flat plate tests shows a medium steepness Stokes wave on the plate at Fr = 0.4.  The submerged horizontal hydrofoil (white) is shown upstream of the vertical, surface-piercing flat plate (black) and the starboard flow straightener is shown on the far right side of the photo.

Sample data

Contours of boundary layer x / L = 0.5 and wake x / L = 1.25 axial velocity (U) measurements for Fr = 0.13.

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References

Stern, F., Parthasarathy, R., Huang, H.P., and Longo, J., (1995), "Effects of waves and free surface on turbulence in the boundary layer of a surface-piercing flat plate," In: ASME fluids engineering Conf. Symp. on free-surface turbulence, Edited by E. Rood and J. Katz, American Society of Mechanical Engineers, New York, FED-Vol. 181, p 37.

Stern, F., Hwang, W.S., and Jaw, S.Y., (1989), "Effects of waves on the boundary layer of a surface-piercing flat plate: experiment and theory," J Ship Research, Vol. 33, pp. 63.

Stern F., Choi, J.E., and Hwang, W.S., (1993), "Effects of waves on the wake of a surface-piercing flat plate: experiment and theory," J Ship Research, Vol. 37, pp. 102.

Longo, J., Huang, H.P., and Stern, F., (1998), “Solid/free-surface juncture boundary layer and wake,” Experiments in Fluids, Vol. 25, pp. 283-297.  (pdf)

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