HYDRODYNAMIQUE TRAINEE ET RESISTANCE HYDRODYNAMIQUESHYDRODYNAMIQUE TRAINEE ET RESISTANCE HYDRODYNAMIQUES

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the displacement of a vessel is the weight of water it displaces, so its volume immersed X density of water.

Aerodynamics Hydrodynamics web app: aerodynamics-hydrodynamics-database

HYDRODYNAMICS

hydrodynamic

Hydrodynamics, general

When an object is immersed in a fluid stream, there is phenomena of friction and turbulence.

The study of hydrodynamic resistance (Rh) does not currently have a comprehensive theory that would apply an equation corresponding to different cases accurately. We therefore divided the phenomena within certain parameters:

The total coefficient of hydrodynamic resistance (Ch=Rh/displacement) for an object in the deep sea without surface effect is defined as:

  • Ch = Rv= Cv.(Re.K/L)

 

The total coefficient of hydrodynamic resistance Ch = Rh / displacement for an object moving close to the surface is defined as:

Ch=  Cw.(Fr) + Cv.(Re . K/L)

       

 

 

Different types of approaches used to evaluate the hydrodynamic coefficient (Ch):

Despite advances in computer modeling, testing models are still essential.The effects of friction measured experimentally basins hulls, are themselves subject to scaling problems, solved by the laws of similarities (See: Froude)

effects of friction measured experimentally basins hulls

testing model Towing tank

 

Another technique for evaluating hydrodynamic behavior is to compare measured data from a series of standard forms and extrapolate the consequences of changing forms.

 

serie Taylor

resistance carene

serie NPL

resistance carene

serie Nordstrom

resistance carene

63 serie

resistance carene

serie SSPA

resistance carene

64

resistance carene

The naval hydrodynamics studied resistance to the advancement of ships, en savoir plus sur l'hydrodynamique navale 

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performaces aerodynamic drag and lift boat hull underwater

 

 

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