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Hello,

I have a simulation using several friction coefficients constant in time.

I get the same probleme (GIVE THE CORRESPONDING FRICTION COEFFICIENT) when I launch the calculation, althought the coefficient are saved at each node of the mesh.

I am using telemac-2D (6.0) and Fudaa. I tried to make an initial condition file, then I tried too the manipulation you described Jean-Michel, but the result stays the same. At last I tried to launch the simulation without Fudaa, and it did'nt solve it neither.

I know it is meant to do it automatically, but is there an explicit way to force telemac2d to look for the coefficient directly in the geometry file?

With best regards,
Jean

When I give a FRICTION COEFFICIENT = 0, I then get a calculation and can see the right coefficients in the result file (Output variable W). But I don't know for the moment which one between the keyword and the geom file it took into account for the calculation.

I have another simulation which is similar: the keywords PRESCRIBED FLOWRATES and PRESCRIBED ELEVATIONS are all given as nil in the steering file (my mistake), but are really given in the cas.liq file and hot start file (those are right).
Anyway this simulation works well, maybe Fudaa can skip some parameters which are given as nil and found them in the right place.

I will compare a nil FRICTION COEFFICIENT simulation and a constant FRICT COEFF to see what it looks at.

Hi Jean,

I also assigned a reasonable Manning's roughness coefficient through the Keyword and the program worked. However, my intention was to make TELEMAC2d read the roughness values from the BOTTOM FRICTION layer of the geometry file.

I am almost certain that it did read it from the geometry file as I got different output (water depth) for different roughness configuration in the geometry file.

I accepted Jean-Michel's suggestion that as long as I see the line

FRICTION COEFFICIENTS READ IN THE GEOMETRY FILE

in the program listing I presume that TELEMAC2d is reading the friction coefficients from the Geometry file.

Cheers,

Joy

Hi Jean,

Please ignore my previous post. I just cheked my results more meticulasly and it seems sometimes TELEMAC is not reading the friction coefficient from the Geometry file. I will check this more throughly and let you know.

Joy

Hi
About the friction coefficient
Telemac use firstly the constant value given in the steering file.
If a previous computational file is used and if this file contains the friction coefficient, telemac use this value.
I'm not sure but if the friction coefficient is given inside the geometry file, it seems to me that telemac use it but it could be erase by the friction coefficient taken from the previous computational file.

On things sure, if you print the friction coefficien in your result file, you could be sure that telemac used the value writen in the result file;

On fudaa, if you would like to manage the friction coefficient with spatial varaition, fudda automaticaly generate a previous computational file in which it store the nodes value

Hope this helps