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Three-Dimensional Resistance - Coggle Diagram
Three-Dimensional Resistance
Derived from 2D Flat Plate
\(C_{F0}= \dfrac {0,066}{(log_{10}R_n-2,03)²}\)
Frictional Resistance Line
\(C_{F0}= \dfrac {0,075}{(log_{10}R_n-2)²}\)
Model-ship correlation Line
Viscous Resistance Simulation (Hughes - Hugh Jackman Wolverine)
Total Resistance = Viscous Resistance + Wavemaking Resistance = Friction + Residuary
\( C_{TM}=C_{VM}+C_{WM}=C_{FOM}+C_{FORMM}+C_{WM} \)
\( C_{VM}=C_{FOM}+C_{FORMM} \)
\( C_{FO} \) Frictional
Real Ship
\( C_{FORM} \) reduces
\( C_{FORM} \) Viscous Effect
M - Model, S - Ship
Wave making is same for Model and Ship
\( C_{RM} = C_{FORMM}+C_{WM} \)
Residuary Resistance = Form Resistance (Viscous) + Wave-making
Run-in Point
Small Fr
\( C_{WM} \) tends to 0
\( R_n=R_{n0} \)
\( C_{TM}=C_{VM} \)
Form Resistance Coefficient
Shifts \( C_{F0} \) upwards
Due to Hull Curvature
\( C_{F0} \) is Equivalent
Flat Plate Resistance
Coefficient
2 dimensional
\( (1+k)= \dfrac {C_{TM}R_{n0}}{C_{F0}R_{n0}} \)
Form Factor (Form Resistance Coefficient)
\( (1+k) \)
DOED NOT VARY with \( R_n \)
\(k\) - associated to 3 dimensional form
Froude vs Form methods
Froude
Residuary
what is not Frictional
Does not matter height of curve
only the curve itself
Form
Viscous = Frictional + Form
Shifts curve upwards
