Hello there,
I am modelling a stream that flows into a tunnel. The unsteady flow model runs fine, however the profile plot shows some spikes on the energy line, most notable is the transition from open channel to tunnel (lidded sections). See profile here:
https://drive.google.com/open?id=0B8avbGM7xiDTOER5ZW9KUzJCMzA
in plan view it looks like this:
https://drive.google.com/open?id=0B8avbGM7xiDTVldnS2lrOHY3WTg
I have already tried modifying the htab parameters and adding XS (interpolated). What other cause could there be?
Thanks in advance for any help,
Cesar