Recent content by tankFan86

Check out Svendsen's http://books.google.com/books?id=g7-PHmnrvQcC&dq=near+shore+hydrodynamics&pg=PP1&ots=MHXYR1t0TF&source=bn&sig=QOANMG8R5O_v66gffWA6u-hT__4&hl=en&sa=X&oi=book_result&resnum=4&ct=result". He has several excellent selections on water wave theory.

I think the answer is that nobody knows, but folks around here seem to disagree with me. I think that the flight of an object through a gas is highly non-trivial. The two prevailing approximations are that the force of resistance due to drag from the gas is proportional to either the first...

It's nice to find some physics where the theory is less developed than the experiment!

Well the assumption does have some validity, for sure. But I think it would be naive to think that drag can be completely understood in these terms.

Check out these videos if you want your mind blow about drag: http://web.mit.edu/hml/ncfmf.html". They might make you rethink the approximation that drag is proportional to the first or second power of the velocity.

I think you have posed an insanely hard question. If immediate results are required, I think collecting some experimental data might tell you lot about this problem. If you really want to explore the problem theoretically, you are dealing with the dynamics of a compressible fluid in a crazy...

At first glance it sounds like you have a nasty semi-free-boundary problem that I don't even begin to know how to pose mathematically. Certainly the final pressure depends on the rigidity of the containing vessel.

Sounds like a standard problem in ODEs. Could you be doing homework? If you are going to solve it with ODE's, use Torricelli's law for the velocity of the jet and derive an ODE for the level of the fluid from the law of mass balance. If you want to use PDE's, you're guess is as good as mine.

How do these work if the math is too difficult? Do they just look up things in tables as well? Have you tried solving Navier-Stokes for simple geometries?

Hey I think I get it. That's really neat! Now how the heck do you write that mathematically?

I think I am beginning to understand the phenomenon at work here. In response to the OP's questions, I think it depends (as always). If you are draining a large enough tank through small enough holes, then I do not think the velocity will be appreciably affected by the size of the holes, only...

Do domestic water piping systems drain under gravity, or is pressure added to the system?

I agree that a transparent list of assumptions is critical to any study of fluid dynamics. What assumptions can we make in this case? Certainly we have incompressibility. Also, the fluid is baratropic, meaning it is under the influence of a conservative potential (gravity). Can we assume an...

By `loss' I think you mean an ideal fluid. What do Euler's equations of motion say about this phenomenon? I believe Bernoulli just gives the same as Torricelli.

Wouldn't a tank draining through a hose be governed by Torricelli (as a first approximation)? He says that the velocity of the jet is proportional to the square root of the height of the water above the jet. Changing the size of the aperture should not affect the velocity of the jet.