[Nek5000-users] Traveling gravity waves

[nek5000-users at lists.mcs.anl.gov]

I am not an expert on surface waves but just wondering if
you are initializing with one wave component such as this?
[image: \eta\, =\, a\, \cos\, ( k x\, -\, \omega t ).]My understanding is
you should have multiple components to see something interesting. This can
be simply achieved by modulating the above
form by a spatial localization function such as exp(-(x-x0)2) or add other
components such as a1 cos(kx...)+ a2 cos(2kx...)+...etc

Ammar





On Thu, Dec 6, 2012 at 6:38 AM, <nek5000-users at lists.mcs.anl.gov> wrote:

> Hi Neks,
>
> I am trying to set up a traveling gravity wave and started from the
> std.wv example.
>
> - In the useric I prescribed the the Initial velocity by using linear
> wave theory (Airy)
>
>
> http://en.wikipedia.org/wiki/Airy_wave_theory#Solution_for_a_progressive_monochromatic_wave
>   wave amplitude
> - the initial mesh was generate with genbox with periodic sides, bottom
> wall and a free surface
> - the surface tension was excluded by setting sigma & We = 0
> - reverted density & viscosity to dimensional  variables (SI Units) in
> the .rea to get correct velocities
> - set the gravitational force in userf ffy = -9.81*param(1)
>
> But instead of a traveling wave the system reverts to a sort of standing
> wave immediately
>
> Do I have set the initial velocity of the moving mesh as well? And if so
> are wx,wy the correct variables to do so?
> Did I apply the dimensions correctly?
>
> I attached the .rea & .usr, any help with my Problem would be greatly
> appreciated.
>
> Thanks
> Arne
>
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