# D*mn the Physics Man ! Full Speed Ahead

1. May 31, 2007

Hello all,

In a classic example of putting the cart before the horse...

I have designed a underwater Vehical in a CAD program I would like to test. I have no educational physics background of any kind. I just had the idea and did it. Now that its done I would like to begin to understand how my design will behave. And what design changes are best to make.

I am currently down loading all the EFD videos from the sticky, and understand that I must review these before continuing.

I also understand from a cursory viewing of some of the FD videos that a Physical Model will be needed no matter what. I am capable of that, and have a scale model in mind. I have no idea yet where I will test it.

What I would like to know is what is the best way to get my cad model into an underwater simulator software program, if possible. And what the software is called.

Also any other input on how I should proceed is welcome, Thx.

2. Jun 1, 2007

### Danger

I have no idea from the computer or math side of it, but why don't you just build a model and an 'aqueous wind tunnel' to see what happens?
I have a suspicion, though, that this is a situation where the little stuff will kill you no matter how much you concentrate upon getting the big stuff right. It'll probably come down to seals, battery life, and control circuits.

3. Jun 1, 2007

### FredGarvin

Any fluid dynamics package will do what you need. Programs like FLUENT will be more than capable if you happen to have access to it and someone that knows how to use it. If you don't know how to create the model and know how to apply the proper boundary conditions, it will be GIGO.

Honestly, your best bet is to build a model and test it.

4. Jun 1, 2007

### ank_gl

yeah danger is right. i also worked on an underwater vehicle(or something that worked under water). but yes it all comes down to how well u prepare for leakages

5. Jun 1, 2007

Do you know of any "homemade" examples on the net I could follow. I Googled and Youtubed but couldn't find or missed any examples. Even a sketch of a proper setup would do.

I will keep that in mind as I plan and proceed.

I had planned to use proven systems & examples from other underwater RO/V's for the prototype. I didn't see any real reason to get exotic or experimental at first, although I would like too.

1. Do you mean for the "Electronics Payloads" the Motors, or something else I am overlooking ? ( I think I may have a work around for the motors, but I have to do more research & may be completely off, we'll see.)

2. I am almost certian at this point as strange as it may seem that there will be plenty of Battery space, but they will need to be custom packs fitted for the design. Again I could be completely off.

3. Would you elaborate please ? I am unsure if I have touched on this with my research or not.

6. Jun 1, 2007

Thank You. I put a call into a local Prof., waiting to hear back from him.
http://engineering.uakron.edu/~povitsky/" [Broken]
Is this the right direction ?

Get someone who knows what the h*ll they're doing, or I'm wasting my time.

Is there a prefered Underwater Model material, should it be made of the planned prototype materials. Or just plastic.

Thx Fred, I have also read many of your posts on the subject. I really appreciate the feedback, I have no other assets related to what I am doing other than this Forum.

Last edited by a moderator: May 2, 2017
7. Jun 1, 2007