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 delft3d flow .

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Nesting Limitations for Tidal Model in Delft Dashboard John McDowell 6 3092
Delft3d flow error in PARALLEL (zeta layer) linux and works well in windows shanas pr 0 2026
ERROR Flow exited abnormally in the example called Bornrif in the manual Anita Jackson 0 3462
Sediment assigned to river discharge Dianne Deauna 1 885
FLOW, Domain Decomposition, and Space Varying Wind Errors Julia Hopkins 7 4329
Delft3D FLOW Tracer Negative Concentration Nill Ng 11 6867
Delft3D Flow - error running mdf Lumas Helaire 0 1636
Flow Input button in GUI not responding Matthew Nahorniak 14 7788
Delft3D-FLOW: *** ERROR Deltas > water depth in TRATUR Ruairi MacIver 4 5324
Tidal water level variation inside an estuary Saeed Shaeri 3 4018
Delft3D-Flow warning message Yun Wang 1 3337
Meteo File Interpolation James Knighton 0 2610
Vertical flow profile Phil Shepperd 1 2261
Meteo files missing values not recognized James Knighton 4 4131
Neumann Boundary for Delft-Flow model ? Thomas SAILLOUR 9 9850
Error starting flow Anonymous 0 2889
Starting FLOW run at time other than 00:00:00 A.L. R 1 2014