An Experimental Determination of Pressure Forces on a Ship Model From an Analysis of the Wave Profile

1965 ◽  
Vol 9 (03) ◽  
pp. 113-117
Author(s):  
Grant Lewison
Keyword(s):  
Pressure Distribution ◽  
Experimental Determination ◽  
Wave Resistance ◽  
Wave Profile ◽  
Full Scale ◽  
Axisymmetric Model ◽  
Ship Model ◽  
New Form

A method for the analysis of the wave profile alongside a ship model is presented in a new form. The pressure distribution over an axisymmetric model is computed, and wave resistance and vertical forces are derived from it. The application of the method to other model forms and also to full-scale ships is discussed.

Experimental determination of plume properties in full-scale hydrogen-oxygen rockets

1989 ◽  
Author(s):  
D. BROWN ◽  
C. LIMBAUGH ◽  
V. ZACCARDI ◽  
R. ESKRIDGE
Keyword(s):  
Experimental Determination ◽  
Full Scale

Effect of a Rotational Wake on the Wavemaking Resistance of an Ogive

1970 ◽  
Vol 14 (02) ◽  
pp. 84-99
Author(s):  
J.-C. Tatinclaux
Keyword(s):  
Asymptotic Form ◽  
Surface Profile ◽  
Local Effect ◽  
Wave Resistance ◽  
Wave Profile ◽  
Volume Distribution ◽  
Wake Effect ◽  
Wave Elevation ◽  
Unbounded Fluid

The rotational wake of a two-dimensional ogive in an unbounded fluid is simulated by a volume distribution of vertical line vortices. Expressions for the wave elevation and the wave resistance, including wake effect, are derived. It is found that, with the chosen vorticity, the wave resistance is from 10 percent larger to 35 percent smaller, depending upon the Froude number, than in the irrotational case. It is shown that, when the wave elevation ζ is expressed as the sum of its asymptotic form ζas and a quantity Z(ω;x,y) representing the local effect of the vorticity present in the vicinity of the transverse cut, Eggers' method for the determination of the wave resistance from surface-profile measurements is valid when applied to the asymptotic wave profile, i.e. to the quantity [ζ(x,y) – Z(ω;x,y)].

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