Re: [Anuga-user] ANUGA

[Stephen R. <ste...@an...>]

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