open TELEMAC-MASCARET The mathematically superior suite of solvers

I'm kind of confused with the quantity of prescribed elevations that TELEMAC requires. I'm trying to run a simulation (my first one, by the way) where I have 4 open boundaries. At one boundary, I prescribe the flowrate; at another boundary, I prescribe the depth and the other two boundaries are free open boundaries.

So in my steering file, I prescribed the flow rate with the keyword:
PRESCRIBED FLOWRATES = 0.0;0.0;0.0;0.45

And since the prescribed depth is variable in time, I used the liquid boundary file. However, I just put one column for the boundary with prescribed depth. When running the simulation, TELEMAC2D stops after reading such file and the error message is:

SL: MORE PRESCRIBED ELEVATIONS ARE REQUIRED IN THE PARAMETER FILE, AT LEAST THREE MUST BE GIVEN





I don't know what this means.
1st: Is the parameter file the liquid boundary file?

2nd: why should I prescribe three elevations at least?

3rd: what depth should I prescribe for the other two boundaries and which boundaries are those?


Thanks

Hi
Reading the manual carefully could be a good idea to well understand all the management of keywords...
Even if you use the liquid boundary file you should give the same number of values into prescribed elevations than the number of liquid boundaries.
In fact the same numbers as in prescribed flowrates.
Some values are dummy and/or unused but this is the rules.

Regards

Actually I read carefully the manual, that's why I don't understand. I have 4 liquid boundaries, so it shouldn't tell me that at least I need 3.

Now, if adding three more columns (filling with 0 elevations all the boundaries); what will TELEMAC do? Since I have FREE OPEN BOUNDARIES, filling with 0 the liquid boundary file for all the boundaries would mean that the calculation of depth at those free boundaries will be replaced by 0?

Thanks

Even you give a value, the value was not use if the boundary doesn't require it.
For example, if your first boundary has a discharge value, you could give the value you want in the prescribed elevation, this doesn't change anything.
For more details on the way it is used or not, you could look at bord.f subroutine

In case someone is interested. It seems that the problem was not to prescribe THREE elevations, but that I needed to prescribe an elevation at boundary 3. I was not prescribing the elevation for the boundary that I needed to, so TELEMAC was still requiring such elevation. I mean, that the number inside the brackets refer to the boundary ID and not to the number of elevations that one needs to prescribe.

I'm not sure about this, because I also corrected other problems with my steering file. But I don't get that message anymore.


Best,