open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi everybody

in the user manual, the .slf file of gaia is the same as the T3d's one, but the .cli file is pretty different. The problem is I don't see the difference between the gaia and the t3d .cli files when I use bluekenue to create it (so I use the same file). And I think it is why my gaia don't show any results (I see the result files and the components but values are at 0 or nothing moves) or computation crashes sometimes.

Anyway I think you understand my problem, How to properly create/define the .cli file of Gaia.

thanks for all

Josias

Hi Josias,
I think it is quite good explained in Gaia user manual 6.1.2 Boundary conditions file. THe difference between telemac (2D or 3D) and gaia is the 2nd column. For telemac it is LIUBOR (type of boundary condition for the x-velocity). For Gaia it is LIQBOR (type of boundary condition for the bed load solid discharge).
If you have only suspension you can have the same cli-file as the 8th column is the type of boundary condition for tracer (telemac) or concentration(gaia).

If you want concentration to come into your inlet boundary you need a 5 (Dirichlet boundary condition) in the 8th column for the inlet boundary nodes.

Best regards,
Rebekka

hi everybody,

hi Rebekka , "good explained in Gaia user manual" yes but your explaination is better,

I created a table base on t3d user manual 4.3.4. The boundary conditions file,



it would be very interesting if you can add some remarks in / complete it.

if it seems boring you can just answer the following questions just by Yes or No or a number, even if it seems obvious:

We know that the Dirichlet has 2 values, 5 is generally used for rate/concentration , and 6 generally for velocities...

1. if I want to see/have bed load => 2nd column (LIQBOR) = 5 (I supposed) or 6 ?

2. if I want to see/have modifications of the Bottom elevation => 8th column (LIEBOR/LICBOR) = 6 (I guess)?

3. for the 8th column the value 4 means nothing ?

4. for the 2nd column the value 4 means nothing ?

5. LIVBOR is not important for Gaia?

6. LIHBOR is not important for Gaia?

thx for your help

bests

Josias

Hi Josias,

it is easier for me to answer your questions:

1) the 6 means Dirichlet boundary conditions for velocities. For LIQBOR or LICBOR/LIEBOR I have never seen it. So it is either 4 or 5 for open boundaries.

2) Inlet Gaia equilibrium conditions (the evolution (LIEBOR column 8) at the inlet boundary is set to the value 0 (EBOR column 9) , QS (LIQBOR column 2) at the inlet is calculated )
4 4 5 0.0 0.0 0.0 0.0 5 0.0
Inlet Gaia QS (QS at the inlet boundary is set LIQBOR=5, bottom evolution is calculated LIEBOR=4)
4 5 5 1.0 0.0 0.0 0.0 4 0.0
Outlet Gaia (QS and evolution will be caluclated LIQBOR=LIEBOR=4)
5 4 4 0.0 0.0 0.0 0.0 4 0.0

3+4) 4 means that the corresponding variable will be calculated (see my answer from 2). If you set it to 2 instead no concentration/bedload would pass this boundary.

5+6) The type of boundary conditions for the velocities (LIUBOR, LIVBOR) and the water depth (LIHBUR) are set in telemac. They are not read in Gaia.

Best regards,
Rebekka

hi rebekka,

great, Thx, I want to say "put it in the user manual please",

hope my last point on this topic (sorry if I insist a bit) :

In the T3d .cli file and the LITBOR perspective , do both 4 and 5 do the same thing in the bedload process and in the suspended sediment process?

I mean
considering the procedure described in t3d user manual 11.7 Coupling and Gaia 1.1.3 Coupling hydrodynamics to morphodynamics,
a) the sediment is given/imposed by the gaia steering file,
b) t3d freeze the bottom, t3d computes hydrodynamic, t3d returns the value of hydro to Gaia,
c) Gaia computes sediments processes (bedload and suspended) based on t3d informations,
d) (now my problem) gaia returns the value of the result of its computation to T3d as new value imposed/given by gaia to T3d for its computation( LITBOR=4 I think ) Or Gaia returns the value of the first sediment value imposed by the gaia steering file in a) step ( I supposed LITBOR = 5 may act like this).

bests

Nice week-end everybody

Josias

Hi everybody,
Hi Rebekka,

Is it possible that the same boundary be used as inflow boundary and outflow boundary, or do I need to create two distinct boundaries, for example one to right and an other to left.

Best

Josias