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 swan .

Thread Started By Replies Views Last Post  
FLOW-WAVE simulation error Giulian Monteiro 0 122
The question of where to find the source code of windgrowth Chenhui Wu 3 1020
Wrong results obtained using SWAN when taking diffraction into account Peng Dai 0 252
*** ERROR: Unable to open file SWANOUT2 A D 2 2152
Where to change breaker delay (F_lam) parameter? Sarah Margaret Trimble 0 501
Initial conditions for WAVE? Dmitry Kushnir 3 1853
VERY slow computation! Erin King 0 747
swan diag warning - length of segment short Kit Stokes 1 1367
Delft3D-SWAN error - Segementation Fault (core dumped) Nate VanArendonk 2 4716
Wind Input for SWAN Nate VanArendonk 0 2275
Grid format for SWAN. Vector? Nate VanArendonk 0 527
Unibest-Swan coupling Gwenaelle MADEC 0 1890
Wave - Rock out crops karunakar kintada 1 1262
Delft3D-WAVE stops unexpectedly Julia Hopkins 14 9989
delft 3D Wave(standalone) input computational error Andreas Papadimitriou 3 2577
SWAN - boundary limits or memory constraints? Joao Morim do Nascimento 6 5260
D3D-WAVE: Quirks when using SpectrumSpec = from file Ruairi MacIver 1 3582
Delft3D WAVE with 2D Spectra boundary forcing commands Robert Jenkins 0 1568
How to change whitecapping settings Hannah Snow 1 2274
SWAN stops calculation Lika Borisova 1 1819