ITTC 1957 PDF

ITTC ) log. ,0. F n. F. CR. C. ×. = 2. )2. (log. ,0. −. = n. F. R. C. 3. Resistance of a Ship. Model testing. Extrapolation of the friction resistance. For all model tests, we have to choose a scale, λ, for the model. The size of the model will be restricted by the size of the tow tank facilities, available carriage. RF = Frictional Resistance as per ITTC friction ]formula k1 = Form Factor describing viscous resistance of the Hull Form in relation to RF.

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Some applications of the three-dimensional extrapolation of ship frictional resistance – IOS Press

The ratio between these two forces is known as the Reynolds number. Evaluation of increased fuel consumption is made on the basis of estimated added resistance for different speeds and wave frequencies. In this article we will talk about another method of resistance calculation using the ITTC school of thought and Reynold number theory. The co-efficient of frictional resistance The coefficient of frictional resistance can be given by the formula: Abstract Added resistance in waves is the second-order steady force dependant on the ship motions.

In this paper, additional fuel consumption is approximated in relation to the increased resistance, i. Now we have calculated all the co effecients related to the ship and one value related to ship. Calm water resistance is calculated according to the potential flow theory and ITTC model-ship correlation line. Fuel consumption of a ship advancing in a seaway is affected by added resistance in waves. Therefore, overall assessment of added resistance in regular waves is achieved through evaluation of the ship drift forces and quadratic transfer function.

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The type of flow depends upon the inertia forces and the viscous forces. Now calculate the value of the Reynolds number for the ship and take it as Rn ship.

Motion induced resistance due to heave and pitch motions as well as reflection induced resistance are taken into account.

Correlation of fuel consumption with various wave frequencies that the ship may encounter in its voyage is obtained. Consider a flat smooth surface such as a plate moving through a viscous fluid. Ittf induced resistance due to heave and pitch as well as reflection induced resistance are taken into account. Ship advancing in regular head waves with different speeds is examined.

In this way we shall determine the resistance of the ship and hence the effective power. Full text not available from this repository. Calm water resistance is calculated according to the potential theory and ITTC correlation line. Correlation of fuel consumption with various wave frequencies that the ship may encounter in its voyage is obtained.

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The movement of the fluid in the wake takes two forms. One assumption is made here: More information and software credits.

Influence of added resistance in regular waves on ship fuel consumption. Added resistance, Potential flow, Regular waves, Fuel consumption, Panel method, Quadratic transfer function.

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Ship advancing in regular head waves with different speeds is examined. Added resistance in waves is the second-order steady force dependant on the ship motions. The added resistance in waves is calculated using three-dimensional boundary element method based on the potential flow theory.

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This layer which is moving along with the plate is called as boundary layer or frictional wake. After some distance from the plate, the fluid has no motion, only the plate along with the layer travels.

THE ITTC LINE – ITS GENESIS AND CORRELATION ALLOWANCE

Next is turbulent which means there will be intermixing of fluid in between the wake because of the eddies. Laminar means the itttc travels in a series of layer in-between the wake without mixing. It significantly affects ship operability and causes speed loss. In this paper, additional fuel consumption is approximated in relation to the increased resistance.

The added resistance is calculated using three-dimensional boundary element method based on the potential flow theory. Therefore, overall assessment of added resistance in regular waves is jttc through quadratic transfer function.

After calculating the total resistance the value of the effective power can be given by the formula: Evaluation of increased fuel consumption is made on the basis of estimated added resistance for different speeds and wave frequencies.

Therefore the required power and fuel consumption of a ship advancing in a seaway increase. The so-called near-field formulation is used to determine wave loads acting on the ship hull.

Because of the motion some fluid near the plate travels with it.