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! 

 

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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.

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** PLEASE TAG YOUR POST! **

 

 

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

 


Message Boards

Problem with RGFGRID and QUICKIN

U
Ross Penrod, modified 8 Years ago.

Problem with RGFGRID and QUICKIN

Hi,

I'm relatively new to using D3D, and have been having difficulity trying to build a grid in spherical coordinates and then using QUICKIN to build a depth file from a sample file. Here is a breakdown of the problem:

- I manually build a simple grid in RGFGRID using spherical coordinates with a resolution of 0.001 degrees, 102 cells in M direction, 35 in N direction. I then export for use in QUICKIN.
- When I open the grid in QUICKIN, it opens in cartesian coordinates, meaning my grid dimensions are approximately 0.1m x 0.03m instead of approximately 10km x 3km.
- I get this same problem with my sample file as well. I downloaded the sample file from the National Geophysical Data Center using the US Coastal Relief Model. When I import it into QUICKIN, it seems to be interperting the locations of the data points in meters instead of lat/long coordinates.

Any help on this would be much appreciated.

Thanks,
Ross
Qinghua Ye, modified 8 Years ago.

RE: Problem with RGFGRID and QUICKIN

Jedi Council Member Posts: 610 Join Date: 3/2/11 Recent Posts
Hi Ross,

I am trying to reproduce your problem. But at the same time, I would suggest that don't use spherical coordinates while you want only 0.001 degree grids. This really pushes the model and your computer system to the edge of precision. Would you try cartesian coordinates at the same time?

Greetings,

Qinghua
Qinghua Ye, modified 8 Years ago.

RE: Problem with RGFGRID and QUICKIN

Jedi Council Member Posts: 610 Join Date: 3/2/11 Recent Posts
Hi Ross,

I redid the grid and depth files as you described in the standard Delft3D 4.00.01. Both RGFGRID and QUICKIN work fine.

So I am wondering why you got different results. Would you open the grid generated by RGFGRID and see this line: Coordinate System = Spherical? Otherwise your grid is not in degrees.

Regards,

Qinghua