Re: [Anuga-user] ANUGA

[Ole N. <ole...@gm...>]

Yes, that's right.
You can then just put a Dirichlet condition around the entire domain with
zero xmomentum and ymomentum. Stage should probably be set to a value lower
than your lowest point - E.g.-1000

If water ever reaches your boundary it'll just flow out...

On Fri., 11 Jan. 2019, 14:44 rupal budhbhatti <rup...@gm... wrote:

> Thank you very very much Ole sir and Steve Sir. Really!
> Sir, On the upstream inside my domain(not on the boundary) my lake is
> there. I want to give hydrograph as input. Sir, correct me if I am wrong,
> what I understand is  my domain is very large and flood simulations are
> within the domain. It doesn't reach the boundary so I think that the
> boundary conditions doesn't matter much. Right?
>
> Thank you for guiding always! :)
> Kind Regards,
> Rupal
>
>
> On Fri, Jan 11, 2019 at 4:09 AM Ole Nielsen <ole...@gm...>
> wrote:
>
>> Thank you Steve. But if Rupal wants to apply normal depth (as opposed to
>> discharge)) Iwould thought it could be done with existing boundary
>> conditions?
>>
>> Rupal do you want to apply water depth (m) or discharge (m3/s)?
>>
>> Cheers
>> Ole
>>
>> On Fri., 11 Jan. 2019, 09:03 Stephen Roberts <ste...@an...
>> wrote:
>>
>>> Hi Rupal
>>>
>>>
>>> Boundary conditions are implemented by specifying the stage, "xmomentum"
>>> and "ymomentum" at the midpoint of each boundary edge. Consider this as
>>> being specified outside of each boundary edge. There is an associated
>>> edge value for stage, "xmomentum" and "ymomentum" created from the
>>> values of those conserved quantities at the centroid of the triangles
>>> making up the domain.
>>>
>>>
>>> Then the system calculates a flux across the boundary edge, just as it
>>> does for all the interior edges, and these fluxes are used to update the
>>> values of the conserved quantities in each of the triangles.
>>>
>>>
>>> We have not implemented a system to specify a given flux across a
>>> boundary edge.
>>>
>>>
>>> If you do have a given discharge that you want to specify, I would
>>> suggest applying a reflective boundary condition to the boundary need the
>>> place you want to set the inflow, and just inside  the boundary region set
>>> up an Inlet_operator with the specified discharge.
>>>
>>>
>>> Cheers
>>> Steve
>>>
>>>
>>> ==============================
>>> Stephen Roberts
>>> Undergraduate Convenor
>>> Mathematical Sciences Institute
>>> Room 4.74 Hanna Neumann Building #145
>>> The Australian National University
>>> Canberra, ACT 2600 AUSTRALIA
>>> Ph: +61 2 61254445
>>> CRICOS: 00120C
>>>
>>> ------------------------------
>>> *From:* rupal budhbhatti <rup...@gm...>
>>> *Sent:* Thursday, 10 January 2019 6:51:20 PM
>>> *To:* anu...@li...
>>> *Subject:* ANUGA
>>>
>>> Hello Sir,
>>>
>>> Sir, I have query in boundary conditions used by ANUGA. In hydrology we
>>> give both upstream, and downstream boundary condition in form of hydrograph
>>> , normal depth etc. Then how these Dirichlet,Transmissive  and Time
>>> Boundary conditions differ from hydrologic boundary condition?
>>>
>>> Sorry if it is too basic. but I am confused with these. Please guide me.
>>>
>>> Kind Regards,
>>> Rupal
>>>
>>>
>>>