open TELEMAC-MASCARET The mathematically superior suite of solvers

Dear friends,
The conditions I simulated are changing in space and constant in time. Then, the conditions are specified through BOUNDARY CONDITIONS FILE. Type is 455, by setting q, u is free to change, VELOCITY PROFILES=1; 1; 1。 However, the following error occurred during the simulation and the prompt "PROBLEM ON BOUNDARY NUMBER 3" appeared.
GIVE A VELOCITY PROFILE IN THE BOUNDARY CONDITIONS FILE
OR CHECK THE WATER DEPTHS
OTHER POSSIBLE CAUSE:
SUPERCRITICAL ENTRANCE WITH FREE DEPTH”
I am inexperienced and don't understand this error prompt. How can I correct this situation?
Best wishes

You have supercritical flow at boundary 3, either increase initial depth or make a discharge that slowly ramps up from 0 to 547 m3/s.

Hope that helps,
Patrick

Hello, I'd like to view the 3d grid I drew, just like this grid in the manual. Which software should I use to view it and how to view it?
Best wishes

There are a number of pre- and post-processors listed in this post.

Kindly... Alan

PS Full disclosure, I'm the current main developer for Blue Kenue (BK), so I'd suggest using BK for your task as it seems quite straightforward from what you've described.