TELEMAC-MASCARET Forum: Initial bottom differs from the geometry file (1/1)

Welcome, Guest

TOPIC: Initial bottom differs from the geometry file

Initial bottom differs from the geometry file 2 months 3 weeks ago #46546

TelemacUser1
OFFLINE
Junior Boarder
Posts: 38
Thank you received: 1

Hello,

I created a mesh and ran a telemac 2D case (v8p3r0 on mac; files attached). It turned out that the initial bottom elevation in the result file (r2d.slf) differed from that of the geometry file (new_bridge_no_dam_2yr.slf). The elevation difference isn't large, but I am confused because I thought they should be identical (see the picture).

I was wondering if anyone has experienced this before. What could have been the causes?

Thank you,
Jason

Attachments:

The administrator has disabled public write access.

Initial bottom differs from the geometry file 2 months 3 weeks ago #46547

TelemacUser1 OFFLINE Junior Boarder Posts: 38 Thank you received: 1	Somehow the website did not let me upload the result file and the screenshot...
	The administrator has disabled public write access.

Initial bottom differs from the geometry file 2 months 3 weeks ago #46548

TelemacUser1 OFFLINE Junior Boarder Posts: 38 Thank you received: 1	But the attachment should be able to generate a result file within minutes. Apologies for so many posts.
	The administrator has disabled public write access.

Initial bottom differs from the geometry file 2 months 3 weeks ago #46549

ah_sl OFFLINE Fresh Boarder Posts: 12 Thank you received: 2	This usually happens when you use the key "BOTTOM SMOTHING".
	The administrator has disabled public write access. The following user(s) said Thank You: TelemacUser1

Initial bottom differs from the geometry file 2 months 3 weeks ago #46555

TelemacUser1 OFFLINE Junior Boarder Posts: 38 Thank you received: 1	I see! Thanks! Do you know if BOTTOM SMOOTHING also applies during the simulation (like every time step)?
	The administrator has disabled public write access.

Initial bottom differs from the geometry file 2 months 3 weeks ago #46557

PMV OFFLINE Expert Boarder Posts: 152 Thank you received: 43	Your answer is in the user manual. CONFRON is called once.
	The administrator has disabled public write access. The following user(s) said Thank You: TelemacUser1

Initial bottom differs from the geometry file 2 months 3 weeks ago #46556

ah_sl
OFFLINE
Fresh Boarder
Posts: 12
Thank you received: 2

I don't really know.
But I suspect it's some sort of an AMR according to a conditional check every few timesteps.
Please correct me if I'm wrong, I can look it up further.

From what I've tried, if your model doesn't require a very sophisticated mesh resolution, like channel slopes or sudden drop on the depth there is no need for the mesh refinement.
Even if it needed, it's better to try to refine the mesh first using stbtel and see if the results are convenient or severe hydrodynamic conditions requires this key active.
In this case of activating the keyword sensitivity analysis is even more critical, as the degree of refinement could change the results entirely.

Good luck with your study

Ahmed Salah

The administrator has disabled public write access.

The following user(s) said Thank You: TelemacUser1