Re: [Anuga-user] Waterfalls (free outfalls)

[Benja C. <ben...@gm...>]

Hi you all,

In my opinion you shouldn't use anuga to model a free waterfall. It is
a phenomenon outside the model capabilities for the air entrainment
and other factors. You should use something like RANS models.

Of course, you can use nearly vertical wall with anuga, but will cost
you a higher precision on your grid. Anyway I wouldn't recommend it
for large terrain extensions.

That's my opinion, anyway. If anyone could add more info, that'll be great.

Cheers to you all

Saludos,
Benjamín Carrión.

Enviado desde mi iPhone.

El 28-06-2011, a las 2:50, Cailan Halliday <cha...@ca...> escribió:

> Hello ANUGA users,
>
> I have been trying to get a waterfall defined in the ANUGA modeling system for the past month or so with some limited success. At this point I'm looking for a little guidance, it is unclear to me whether ANUGA can handle sharp drops in topography such as waterfalls or free outfalls. As a simple test case I have defined a 200m wide waterfall with a 50m drop that occurs within 1m (about an 89 degree incline) and a 5e-4 bed slope. Also, about 2600 meters of channel is being modeled upstream of the falls and 100 meters downstream with upstream and downstream boundaries at constant depth and constant y-momentum.  For mild slopes I would expect the critical depth to occur about four critical depths upstream but the critical depth actually occurs at the brink of the falls and sometimes after. Has anyone here modeled a free outfall in ANUGA before? The edge of a waterfall reaches atmospheric pressure, I wonder if this could be the cause of my problems.
>
> Best,
> Cailan Halliday
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