Water resistance as a spring constant

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• Thread starter

  Dell

• Start date

  Jul 4,

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  Constant Resistance Spring Spring constant Water

In summary, the conversation is about creating a dynamic sculpture that can sway on a floating base. The person is looking for a way to model the water resistance and buoyancy on the base using finite element software, which has spring capabilities. However, it is difficult to model water using springs due to its incompressible nature and inability to store potential energy. The force required to push a boat hull into the water depends on the volume of water displaced, so it is important to consider the cross section of the hull. Additionally, water has damping effects that should be taken into account. It is suggested to model the resistance as pressure rather than treating water as a support.

• Jul 4,

• #1

Dell

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i am working on a project for a dynamic sculpture
we want the sculpture to be able to sway and our idea includes placing the sculpture on a floating base(almost like a catamaran) , with wind forces the sculpture will sway.

i would like to know how i may model the water resistance/buoyancy on the floating base using finite element software, the software i use has spring capabilities and i need to know how to evaluate the spring stiffness so it will react like water, to calculate the deformations

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• Jul 4,

• #2

Mentor

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Water can flow (change the equilibrium positions), springs cannot. Springs can store potential energy in their length, water cannot (it is incompressible to a really good approximation). I doubt you can model water with springs.

• Jul 5,

• #3

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Springs typically produce a force that is proportional to their linear displacement. The force required to push a boat hull into the water depends on the volume of water displaced rather than the linear displacement.

So it depends on the cross section of your hull. If your hulls had a uniform cross section (say cubes of polystyrene?) then the volume displaced would proportional to the vertical displacement and it might be easy to model each hull as a vertical spring.

However water also has a considerable damping effect which might be significant if the things moving.

• Jul 20,

• #4

henneh

7

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Just model the resistance as a pressure, it will have a favourable effect against the applied wind forces. Water should not be treated as a support, it has no shear strength unlike soils say which are typically modeled as springs

• Jul 27,

• #5

rezeew

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Water resistance and buoyancy are important factors to consider when designing a dynamic sculpture on a floating base. In order to accurately model these effects, it is necessary to understand the concept of a spring constant in relation to water resistance.

A spring constant is a measure of the stiffness of a spring, and it is directly related to the amount of force required to deform the spring. In the case of a floating base, the water resistance acts as a spring, pushing against the base as it moves through the water. This resistance is dependent on various factors such as the shape and size of the base, the speed and direction of movement, and the density of the water.

To accurately model the water resistance and buoyancy using finite element software, it is important to first determine the spring constant for the base. This can be done by conducting experiments or using mathematical equations that take into account the aforementioned factors. Once the spring constant is determined, it can be input into the software as a material property, allowing for accurate simulations of the base's movement in water.

Furthermore, it is important to also consider the effects of buoyancy on the floating base. Buoyancy is the upward force exerted by water on an object, and it is directly related to the object's volume and the density of the water. This can also be incorporated into the finite element model by adjusting the base's weight and volume properties.

In summary, accurately modeling water resistance and buoyancy on a floating base for a dynamic sculpture requires an understanding of the concept of a spring constant and the factors that affect it. By properly determining and inputting the spring constant and adjusting for buoyancy, the finite element software can accurately simulate the movement and deformations of the sculpture on the floating base.

Related to Water resistance as a spring constant

What is water resistance as a spring constant?

Water resistance as a spring constant is a measure of the force required to compress or stretch a spring when it is immersed in water. It is also known as the spring constant of a submerged spring.

How is water resistance as a spring constant calculated?

The water resistance as a spring constant is calculated by dividing the weight of the object by the displacement of the submerged spring. This gives the force needed to compress or stretch the spring in water.

What factors affect the water resistance as a spring constant?

The water resistance as a spring constant is affected by the density of water, the size and shape of the object, and the properties of the spring itself, such as its material and thickness.

Why is water resistance as a spring constant important?

Water resistance as a spring constant is important in understanding the behavior of objects submerged in water, such as boats, submarines, and marine organisms. It also has practical applications in engineering and design, such as in the construction of underwater structures and equipment.

Can water resistance as a spring constant change?

Yes, the water resistance as a spring constant can change depending on the factors mentioned above, as well as the conditions in which the object is submerged. For example, the water resistance may increase as the water temperature decreases due to changes in water density.

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