NTNUJAVA Virtual Physics Laboratory
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JDK1.0.2 simulations (1996-2001) => Optics => Topic started by: Fu-Kwun Hwang on August 01, 2008, 08:44:11 am



Title: Water surface
Post by: Fu-Kwun Hwang on August 01, 2008, 08:44:11 am
Some waves in nature are neither transverse nor longitudinal, but a combination of the two.
When a water wave travels on the surface of deep water, water molecules at the surface move in nearly circular paths,  as shown in the following java applet.




The water surface is drawn as a series of crests and troughs.


Usageļ¼š
Click and drag the left mouse button will create a rectangulararea.
The wavelength of the wave is determined from the width of the area.

The amplitude of the wave is determined from the height of the area.

Click the right mouse button toggle the animation. (pause /resume)
Click the mouse button twice quickly to change the direction of the wave.


Notice that the disturbance has both tranverse and longitudinal components.
As the wave passes, water molecules at the troughs move in the direction of the wave,
and molecules at the crests move in the opposite direction.

There is no Net displacement of a water molecule  after the passage of any number of complete wave.


Title: Re: Water surface
Post by: reign16 on January 24, 2009, 09:15:22 pm
Oh thank you for sharing that kind of software...



-*-


Title: Re: Water surface
Post by: Wieslaw on August 08, 2009, 01:19:51 am
There is something wrong with the model, not just with the applet. As you can easily see the distance between the particles on the surface changes. Therefore some of the particles of the surface must go inside. I guess that the theory does not include that particles have volume.  It treats them as they were points. Can anybody solve the puzzle?


Title: Re: Water surface
Post by: johnytin on September 22, 2009, 02:44:49 pm
I wish I could store water in a separate tank and let it dechlorinate for at least 1 day as you suggested. My problem is I am living in an apartment, so there is no more room for such a big container . I will definitely follow that method for WC when I move to a bigger house (after graduating from college and find a job, I guess


Title: Re: Water surface
Post by: Fu-Kwun Hwang on October 05, 2009, 09:50:31 am
There is something wrong with the model, not just with the applet. As you can easily see the distance between the particles on the surface changes. Therefore some of the particles of the surface must go inside. I guess that the theory does not include that particles have volume.  It treats them as they were points. Can anybody solve the puzzle?

Yes. It is just a simple model. The particles are treated as points and it did not consider the conservation of the whole volume (it is conserved on average).


Title: Re: Water surface
Post by: Jessica S on January 20, 2010, 11:28:13 pm
Well, great work! You have helped me to improve my knowledge about this field. Thank you so much for sharing.-*-


Title: Water surface
Post by: obavtorips on June 30, 2010, 03:55:17 pm
I am working on a miniature golf course that I would like to have a stream flowing through it.  But I dont see a way to model the surface of the water aside from simple pools.  I am hoping there is a script out there that can model the physics to see where the water creates ripples.