Ship maneuvering

CHAPTER 3: THEORIES OF SHIP

MANEUVERING (SHIP INTERACTIONS)

CAPTAIN TANAMESH PUSANASURAPUNT

Fixed Screw Propeller

Single Fixed Screw Propeller

Larger Ship

Ship-Handling with 4 Tugs

Berthing with 5 Tugs

Ship-Handling with 4 Tugs

0900 - 1200

Daniel Bernoulli

+ gz + p = Constant 2 ρ

v: Fluid Flow Speed g: Acceleration due to gravity

z: Elevation of Point Above Reference Planep: Pressureρ: Density of Fluid

Bernoulli’s PrinciplesBernoulli’s Equation

For Uncompressed Flow (Fluid)

Bernoulli’s Equation For Uncompressed Flow (Fluid)

+ + p + gz = F(t) 2 ρ

: Partial Differentiation of Velocity ϕ at Time t g : Acceleration due to gravity

z : Elevation of Point Above Reference Plane p : Pressure ρ : Density

Bernoulli’s PrinciplesBernoulli’s Differential Equation

For Compressed/ Unsteady Flow (Gases)

Bernoulli’s Differential Equation For Compressed/ Unsteady Flow (Gases)

Aerodynamic

COASTAL AREA WHERESHIP INTERACTIONS OFTEN

HAPPEN

Shallow Water Effect

Bank Effect

Shallow Water Effect

SHALLOW WATER EFFECT

(SWE)

CAPTAIN TANAMESH PUSANASURAPUNT

Shallow Water Effects

Shallow Water Effects

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BANK EFFECT (BE)

CAPTAIN TANAMESH PUSANASURAPUNT

Bank Effects

Bank Effects

SUCTION

SPRING OUT THE BANK (Kicking Techniques)

Kicking

SQUAT (SQUAT)

CAPTAIN TANAMESH PUSANASURAPUNT

SQUAT (Keel)

SQUAT (Keel)

Squat

SQUAT (Stern)

POTENTIAL SQUAT (Stern)

SQUAT (Bow)

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P

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POTENTIAL SQUAT (Bow)

Squat is expected when depth < 1.5 draft Squat value should be greater of Value provided in maneuvering data

10 % of draft 0.3 m for every 5 knots Ship with CB greater than 0.75 tends to squat by head

SQUAT

Bernoulli's Principle

Applications

SHIP INTERACTION

CAPTAIN TANAMESH PUSANASURAPUNT

Positive Pressure (+) and Positive Pressure (+)=> Push ApartPositive Pressure (+) and Negative Pressure (-)=> SuctionNegative Pressure (+) and Negative Pressure (-)=> Suction

SHIP PASSING

CAPTAIN TANAMESH PUSANASURAPUNT

Ships Passing

SHIPS OVERTAKING

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Ships Overtaking

Ships Overtaking

Ships Overtaking

Ships Overtaking

TURNING AT THE BEND

CAPTAIN TANAMESH PUSANASURAPUNT

1 Possibility : Keep Inside, With Right Rudder to Bow Straight AheadIf Aft closes to the bank, 2 Choices : Kicking Ahead, or Putting Sternway

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Potential Squat

1 Possibility : Keep Inside, With Right Rudder to Bow Straight AheadIf Aft closes to the bank, 2 Choices : Kicking Ahead, or Putting Sternway

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Squat

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Potential Squat

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3

THE END