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4.5 - Interference Effect - Due to Wavemaking - Coggle Diagram
4.5 - Interference Effect - Due to Wavemaking
Wigley
One wave interferes in another
Wedged Body
Wedged body - 4 waves system
Bow beginning with crest
Forward shoulder beginning with trough
Aft shoulder beginning with trough
Stern beginning with crest
Position fixed of wave generators
only WAVE LENGTH changes with SPEED
will change interactions BTW systems
Type of wave contribution
Wave-making resistance coefficient
\( R_w \propto V^6 \)
Separate contribution
Transverse Waves
until Fr
0,4
Divergent Waves grow
Fr
above 0,4
Above Fr
0,5
Crossing on graph
Above approx Fr=0,45
vessel sinks
Trim by stern
No hump beyond
Rw decreases with increase in speed
Froude sketch
Bow wave system
Energy moves water laterally
Divergent waves
No change in wavelength
Test models with
same bow and stern
only changing LENGTH
Vessel as long as a parallel body
Bow does not interfere in Stern
Mean Residuary Resistance \( \propto V^6 \)
Mathematical Theory
Wave resistance
generated by parts near the surface
Agrees with Eggert experiments
Varies with Displacement
Low displacement, low wave-making resistance
Interference BTW
Systems with opposite signs
more important
Trough can coincide with trough and augment the wave
Ship-shaped - 4 wave systems
Sames as Wedged
But shoulders systems
NOT FIXED anymore
Ship wave length
almost same as deep sea wave length
