Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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A wave with a period of 8 seconds and a height of 5.5 meters propagates in a water depth of 15 meters. What are the horizontal and vertical velocities and accelerations at an elevation of 5 meters below the still water level when the phase angle is 60 degrees?
A ship's model of scale 1: 100 had a wave
resistance of 1 N at its design speed. The
corresponding wave resistance (in N) in prototype
will be
Q.56 It is proposed to design a ship. The proposed ship (prototype) is has a length of 150
m and wetted surface area of 2000 m² with a speed of 40 km/hr. A model of 1:20 is to
be tested in the laboratory at a velocity corresponding to the wave resistance. The
total drag on the model is 50 N. Determine the following
(1) Wave resistance drag of the model.
(ii) Wave resistance drag of prototype.
(iii) Friction drag on prototype.
1
Given friction drag, F, ==C PAV², C
H
0.01
Rec.2
for Re> 2 x 10'
0.074
Re
Pmode=1000 kg/m³, p.
= 1020 kg/m³,
prototype
v₂ = 1.125 x 10 m/sec, v = 1.11 × 10 m/sec.
P
for R <2 x 10¹,
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