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

Z model and D-waq

Fernando Barreto, modified 2 Years ago.

Z model and D-waq

Padawan Posts: 74 Join Date: 6/21/12 Recent Posts
Hi all,

I have read some threads about this subject, but I would like to set one thing straight. If I have a 3D Z-layer hydrodinamic model, and turn on "Export WAQ input" box in d-gui, do I have to run the "Coupling" section in d-gui with "geometry curvilinear-grid z-layers" in the .hyd file to generate WAQ files in Z-layers?

Thanks in advance

Fernando Barretoo
Michelle Jeuken, modified 2 Years ago.

RE: Z model and D-waq

Jedi Knight Posts: 154 Join Date: 1/21/13 Recent Posts

Hi Fernando, 

No, you don't have to do that. When you have used "Export WAQ input" (the preferred option) the files are already in a format that Delwaq and the D-WAQ GUI can use.