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Hi All,

I've been having a nightmare trying to setup a Telemac2D model with a downstream rating curve as boundary condition.

I'm using a discharge hydrograph as an u/s boundary with a rating curve Zf(Q) as a d/s boundary condition.

When I run the model with an upstream Q and a fixed downstream Z the model runs fine. But once I introduce the rating curve the simulation halts immediately after reading the liquid and solid boundaries. No error message. It just goes to sleep without computing any time step.

I'm attaching my .cas and boundary conditions files to see if anyone can help with the issue.

Also, I've run a steady state simulation to use as a hot start. The steady state works fine.

Thanks in advance!

Hi,

You do not need to set initial conditions in your steering file if you are using a hotstart. Have you tried with VELOCITY DIFFUSIVITY equal to 1.E-5 (it helped me before)? Is your hotstart the model you are trying to run at steady state?. Also, make sure you have a hotstart which has information enough (U,V,S,B at least). I do not use often liquid and hydrograph files, but I think you should swap the columns in the Rating curve, also, change the extension of liquid boundary file from .txt to .slf. I would like to be more helpful, others might be, however, I hope these suggestions work!

Cheers and best wishes!

José

jose2kk wrote:
Hi, thanks!

Yes, the steady-state is what I'm using to get the Hot start (previous calculation) file. Same geometry/mesh etc but does not use a downstream rating curve. This model runs.

I've tried everything you mentioned above and still the same problem. The model just stops right after establishing the liquid and solid boundaries.

I think the problem is either I need to add a flow or Z to the downstream boundary, or something is wrong with my prescribed elevations or discharges.

Hi
add the missing files (in a zip) in order to let us test...
Regards

Hi,

maybe it helps: in the liquid boundary file you specify for the first 21600 seconds zero inflow. You want to have this? This means also that your water level at the outlet will have a constant value of 1053.17 in this period. So, maybe your starting conditions from the hotstart file don't fit with these hydraulic boundary conditions. You could set the listing printout period to 1 in order to get more informations what happens in the first time step.

Hope this helps,
Clemens

konsonaut wrote:
Thanks.
Yes, I had seen that and modified. The problem is that the software does not even start with step 1. It stays hanging right after recognizing the 2 liquid and the 2 solid boundaries.

Below are all the files from the model.

Thanks for your help guys.

EDIT: Had to remove the Hot-start results file as it was too big. I will run it with fewer report interval to get a smaller file.

Hi
just extract the last time step of the hotstart file will be sufficient...

Regards

Hi,

maybe another hint: you shouldn't have blanks in your file names, e.g. in this: FaroOF-DS Rating Curve.txt

Best regards,
Clemens

c.coulet wrote:
Hi,

I'm attaching the Hot-start file.

Thanks!

I've updated the model files to use no spaces, but it makes no difference. The model still crashes at the same spot (before any time step). It's not a proper crash either... it does not return a computation error message.

Hotstart file attached here

Thanks!