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

Obtaining software

Scott Baker, modified 7 Years ago.

Obtaining software

Youngling Posts: 4 Join Date: 10/23/13 Recent Posts
I filled out the GUI request form twice but have yet to hear back. I was hoping to avoid having to download extra software just to maintain a subversion (and have to compile the code myself).
Are there pre-compiled versions available? Or should I just go ahead with downloading the subversion?
Arnold van Rooijen, modified 7 Years ago.

RE: Obtaining software

Hi Scott,

I forwarded your question to the software department who is responsible for distributing the GUI.

They are currently very busy with the organization of the Delft Software Days (, but I hope you will get an answer soon!