intro story D-Flow FM

 

D-Flow Flexible Mesh

D-Flow Flexible Mesh (D-Flow FM) is the new software engine for hydrodynamical simulations on unstructured grids in 1D-2D-3D. Together with the familiar curvilinear meshes from Delft3D 4, the unstructured grid can consist of triangles, pentagons (etc.) and 1D channel networks, all in one single mesh. It combines proven technology from the hydrodynamic engines of Delft3D 4 and SOBEK 2 and adds flexible administration, resulting in:

  • Easier 1D-2D-3D model coupling, intuitive setup of boundary conditions and meteorological forcings (amongst others).
  • More flexible 2D gridding in delta regions, river junctions, harbours, intertidal flats and more.
  • High performance by smart use of multicore architectures, and grid computing clusters.
An overview of the current developments can be found here.
 
The D-Flow FM - team would be delighted if you would participate in discussions on the generation of meshes, the specification of boundary conditions, the running of computations, and all kinds of other relevant topics. Feel free to share your smart questions and/or brilliant solutions! 

 

=======================================================
We have launched a new website (still under construction so expect continuous improvements) and a new forum dedicated to Delft3D Flexible Mesh.

Please follow this link to the new forum: 
/web/delft3dfm/forum

Post your questions, issues, suggestions, difficulties related to our Delft3D Flexible Mesh Suite on the new forum.

=======================================================

** PLEASE TAG YOUR POST! **

 

 

Sub groups
D-Flow Flexible Mesh
DELWAQ
Cohesive sediments & muddy systems

 


Message Boards

D3D flow stops in OpenDA calibration without any obvious reason

MP
Markus Promny, modified 6 Years ago.

D3D flow stops in OpenDA calibration without any obvious reason

Youngling Posts: 5 Join Date: 8/6/12 Recent Posts
Hi,

I am using Delft3D flow v 4.0 with OpenDA calibration (4 domains, 1 calibration event, calibrating main channel roughnesses) on a windows7 machine. So the whole calculation is running several times with iteratively altered roughness parameters. In run no. 3 (minor change of the roughness value in the 3rd main channel area from upstream) the simulation runs all the way to the very last time step (as it did two times before) but then doesn't continue and doesn't write the last restart values.

Instead of what it gave in tri-diag of runs no. 1 and 2:
...
*** Restart file written at 8520.0000 minutes after ITDATE
*** Restart file written at 9960.0000 minutes after ITDATE
*** Restart file written at 11400.0000 minutes after ITDATE

*** Simulation finished *******************************************************

it gives:
...
*** Restart file written at 8520.0000 minutes after ITDATE
*** Restart file written at 9960.0000 minutes after ITDATE
*** ERROR The total number of NEFIS errors/warnings is 117

*** Simulation finished *******************************************************

without further mentioning any errors! So my question is: has anybody seen this before? Is there a maximum number of warnings which automatically lead to an error and simulation stop? I get a lot of warnings - mostly related to weir crest levels - which did not make any trouble so far (I could well ignore them). If needed I can suply any input and output files. The funny thing is that I cannot see any differences between runs no 1 and 2 which were successfull and run no 3 which stopped after writing the tri-diag of the lowermost domain (not writing the tri-diag-files of the other 3 domains).

Any comment is much appreciated!
Markus
Qinghua Ye, modified 6 Years ago.

RE: D3D flow stops in OpenDA calibration without any obvious reason (Answer)

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Markus,

Since the problem you described is answered through email, we decide to close this.

The problem described is not reproducable by us. Using new released version, the problem didn't apprear again.

Regards,

Qinghua