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

Threads with tag computational grid .

Thread Started By Replies Views Last Post  
RGFGRID Crashes When Merging Irregular Grids - MATLAB Alternative? Robert Jenkins 0 403
Grid orientation problem (D3D-FLOW) Yahia Kala 1 1153
Calculating Number of active grid cells Bilal Ahmed 0 987
Delft3d WAVE grid cell centers vs corners Hannah Snow 0 2922
Wind Input for SWAN Nate VanArendonk 0 2158
Grid format for SWAN. Vector? Nate VanArendonk 0 500
Grid Generation Francesco Saliani 1 828
Delft 3D FM Interpolation methods Andrea Neri 0 2677
Regular or Irregular grid Bilal Ahmed 0 2834
wrong entry in meteofile tst.wnd; expecting keyword or commentary, but foun Hardy Lee 0 1883
wrong GSQS (area of computational grid cells) in output Timo de Ruijsscher 3 2540
Grid exactly 1. following the coastline and 2. cutting of where sample ends Robert de Boer 0 1533
Morphological Model Setup | Tidal Flats Oliver Lojek 11 9293
Showing 1 to 13 of 13 entries.