# Two-dimensional standing wave on a disk

Roman Chijner shared this question 8 years ago

Hi,

Tried to get a two-dimensional standing wave on a disk. Indicate the line of nodes and antinodes:

Of course the animation is very slow, but it looks pretty. In the attached pictures presented the case of anti-phase oscillations.

Roman Chijner

P.S. Unfortunately the closure 3D points appear on the Grafiks- plane.

Files: SW0.JPG

1

Roman!

I would say you are pushing this software to its (early) limits. A very nice construction!

1

hello

i think the movement is better redefining the function

cos(a-b)-cos(a+b)= 2 sin(a) sin(b)

so you can define

aux1=2 a sin(v t)

aux2=2pi/lambda

c(x,y)= aux1 sin(aux2* sin(sqrt(x^2+y^2))

and then the calculus for c(x,y) are reduced

i do not know if there is a bug but i can not delete the function c in your file, only i can redefine it

saludos

1

Hello ,

Thanks for replay. I did so purposely: one cosine of the incident, the other reflected wave. Replacement of the product here will not change anything. Here the problems in GG version.

In the last article

and here there are problems with coloring (in the attached image for t=0).

Roman Chijner

1

hello

if GG do calculus in a grid (i suposse 50x50) redefining the function we can reduce 7500 products and 7500 sums in each picture

this do the movement more nice with higher v

about the problem with view , what must be the criterion for viewing two coincident planes: first or last in "construction protocol" or the mixture you had seen?

saludos

1

Hello,

In order to discuss, we must know the basic principles of this algorithm: what parameter are to change, how constructed the grid ...

Roman Chijner

1

Hi,

In order to discuss, we must know the basic principles of this algorithm: what parameter are to change, how constructed the grid ...

This part is still under development : improvements should come... and then we'll make a doc about this.

Mathieu

1

Hi,

Thanks for the development of 3d GG !

Inside,Graphics ATI Radion XPRESS 1250, Windows Vista)).

Roman Chijner

Files: Drog.JPG
1

Hi,

In the latest version does not appear Graphics View 3D. As an example see previous file.

Roman Chijner

Files: Bug1.JPG