|
[Sponsors] |
July 23, 2003, 16:51 |
Solitary wave
|
#1 |
Guest
Posts: n/a
|
I am trying to test the free surface simulation of a 2DV model with solitary wave. It gives me oscillations in the upstream side of the wave. Is there anyone who might know what the cause of the water surface oscillations could be? I guess it is something about implementing the initial and boundary conditions. I send the wave from left boudary by a time-dependent depth averaged velocity. Thanks
|
|
July 23, 2003, 17:48 |
Re: Solitary wave
|
#2 |
Guest
Posts: n/a
|
Is there any thing that prevent you from specifing the wave as an initial surface disturbance (one peak) profile ( I think it is a tanh function, see Wind wave book). You may assume zero velocities in the beginig or use a linear wave theory velocity distribution function. This should start the solution for a damping solitary wave.
|
|
July 23, 2003, 18:10 |
Re: Solitary wave
|
#3 |
Guest
Posts: n/a
|
The model simulates the initial disrturbance and small amplitude Stokes waves, but the solitary wave simultion is not satisfactory. I may not have completely understood the 2nd part of your comment, but a damped solitary wave would not match the analytical solution or did you mean somehting else? Thanks.
|
|
July 24, 2003, 07:54 |
Re: Solitary wave
|
#4 |
Guest
Posts: n/a
|
Are the oscillations unphysical?
If you look at the solution of the kdv equation then you will find that the soliton has an oscillatory tail. This is because the general solution is made up of solitons and cnoidal waves (the solitons are sech^2 profiles while the cnoidal waves are Jacobi elliptic functions -hence the cn). Tom. |
|
July 24, 2003, 15:37 |
Re: Solitary wave
|
#5 |
Guest
Posts: n/a
|
I mean use the analytical solution to initalize the variables fields just to start the solution.
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Solitary Wave in Fluent. | Krystian | FLUENT | 2 | October 16, 2016 00:54 |
How to set up initial solitary wave in the domain | Ted Chu | FLUENT | 2 | September 27, 2016 03:45 |
Scaling up a wave energy converter - free surface flow | mark_l | CFX | 3 | February 17, 2010 17:57 |
what is the condition to use the wave equation? | mmff | Main CFD Forum | 0 | January 26, 2010 05:25 |
simulation of breaking solitary wave | mehdi icho | Main CFD Forum | 0 | July 2, 2002 05:35 |