Calculating the height of the submerged part of the boat in the water?

Simulation Generality
1

Hello

 

I have finished designing a boat and I want to know how it behaves in the water.

I am trying to find out the height of the submerged part of the boat in the water with the SOLIDWORKS software.

I have a license of SOLIDWORKS Flow simulation premium and SOLIDWORKS premium is this possible and how?

 

Thanks in advance

2

Hello

I have no idea how to do this with any software,

However, I think I will try to apply a simple PFS, Fundamental Principle of Statics by insulating your boat.

You just have to apply the weight and the Archimedean thrust I think, quickly estimate the necessary volume of water to be moved, then deduce the height of water on your 3d model.

 

Maybe that's a bit of a rush, I don't have any notion of naval design, but I think it can be a useful approximation.

 

If you have problems with the calculations I can help you.

 

Kind regards

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3

Hello

To my knowledge there is no function in SW to calculate the waterline.
However you can do it with excel...

First of all, you have to calculate the buoyancy:
Buoyancy (kg/cm) = Surface area (m²) x r0: Seawater density (kg/m3) (1025) x 0.01 (unit in cm)

Then we calculate the sinking:
Sinking (cm) = Weight of the assembly (kg) / Buoyancy (kg/cm)

Normally with all this you will have the waterline.


Good luck
A+

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4

This is not the answer but a walkthrough approach

 

 http://www.jph-lamotte.fr/files/tech_archimede.htm

 

@+ ;-)

 

5

Otherwise, there is a very good software for that:

 

http://www.delftship.net/

 

 

You export your Solidworks file in a format that the software will recognize, and you're done!

 

These calculations are not easy!

 

Good luck!

 

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6

I'm getting closer to the other participants on this subject, it's impossible to simulate in solidworks

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7

Hello

 

A video that explains how to calculate this in SolidWorks:

 

http://www.youtube.com/watch?v=pzpFoQcx5Ts

 

Another to calculate the center of flotation:

 

http://www.youtube.com/watch?v=HRJY-0Ryw6I

 

And a question answered on the SolidWokrs forum:

 

https://forum.solidworks.com/thread/28222

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8

Hello

 

I think like thomas.guillard, this track is to be dug (weight of the boat gives the volume of water moved)

However, there is one more parameter that we don't know, and that's the pitch angle

The combination of the position of the center of gravity and the shape of the hull define the angle of the waterline.

There is one parameter too many, but if we impose the orientation of the fold, then as Thomas says, we can find the solution by iteration.

 

I made a simple example in the attached document, where I modeled the displaced water (body "Water") 

I move the height of the plane "Waterline " until

Body weight Boat = body weight Water


bateau.zip
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9

Hello Youness, Is it a life-size boat or model boat? I did

an 80 cm long submarine for my graduation project then

The buoyancy PB I have a little bit between glimpsing the question.

 

If you want to determine the height of the submerged part then it is necessary to

You have to respect the Archimedes' thrust

 

http://www.proftnj.com/archipri.htm

 

It should help you if you don't succeed, let me know.

1 Like