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Hello,

I a facing some problems during running of Telemac2d.(Problems on boundary conditions)

I have 2 inlets and 1 outlet.
Say, Flowrate of Inlet 1 = x m3/s, Flowrate of Inlet 2 = y m3/s and Flowrate of outlet = z m3/s.

Let initial condition = constant elevation = p m

Bathymetric elevation ranges from a to b.

i.e. p>b>a.. and p - b = 10m

I want to know how the flow is calculated in every step.
Plz help me so that I can fix the boundary condition properly. I will be also very thankful.

Hi,

usually you give Q at the inlet and the water level at the outlet. Q at the outlet is calculated by Telemac. Otherwise you have an overdetermined system

Cheers,
Gabi

Hello

In most applications, while boundary conditions are not always (enough) available, it is recommended to care that the flow is subcritical. In these cases, only one condition is needed for each boundary to obtain a well posed problem. You can proceed like described by Gabi for instance.

For some special cases, you can have supercritical inlet (and in this case you need 2 conditions) or outlet (and in this case no need for any condition).

I hope that this helps
with my best regards

Riadh