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: 

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





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


Message Boards

[GUI 4.02.03] Issues with PLCT, segment file, DD couple

Julio Werner Yoshioka Bernardo, modified 3 Years ago.

[GUI 4.02.03] Issues with PLCT, segment file, DD couple

Youngling Posts: 9 Join Date: 4/10/11 Recent Posts
Dear all,

I was facing some issues with the new GUI and DELWAQ which I would like to share.

PLCT windows freeze when I try to re-open a recently saved processes file (*.0) .
I could reproduce this bug in a windows 10 and windows 7 (VM).
Solution: Downgrade the GUI

When I tried to import a segment file using the GUI, it complains that I should select the file, even when the file is already selected.
Solution: Downgrade the GUI

DDcouple using D3D-flow parallel run output (multiple com files).

The unique com file didn't worked.
The solution was to use the ddcouple within the following post:
Michel Jeuken, modified 3 Years ago.

RE: [GUI 4.02.03] Issues with PLCT, segment file, DD couple

Jedi Knight Posts: 154 Join Date: 1/21/13 Recent Posts
Thanks for mentioning this. We must have a look at these issues!