Experiments were conducted to determine the drag coefficient C(D) of the tripwire and the approximate location of boundary layer flow transition. The investigation was performed with a simplified model of a circular cylinder placed on or near a flat plate. The experimental conditions were those typical of ship-model appendage drag experiments. One of the purpose was to obtain a formula for CD when there is a gap between the cylinder and the flat plate. An example of the drag prediction of an appendage, modeled as a flat plate, is given based on the new C(D) and the prediction method recommended here. A comparison with the result obtained using the prediction method currently in use at DTNSRDC is made. The results indicate that both the effect of a gap, if it exists, on the tripwire drag and the effect of the presence of the tripwire on the turbulent skin friction must be considered.
Drag of a circular cylinder on or near a fiat plate appropriate for ship-model turbulence stimulators
Reibungswiderstand eines kreisrunden Zylinders auf oder nahe einer flachen Platte als Grundlage fuer die Simulierung von Turbulenzen mittels eines Schiffsmodells
US Government Reports ; Feb ; 1-66
1983
66 Seiten
Report
English
A Study on the Turbulence Stimulators of Ship Models
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