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 time step .

Thread Started By Replies Views Last Post  
Why does the running time in Quickplot is shorter than tstop? Ummi Asri 0 329
Morphological Model Setup | Tidal Flats Anonymous Anonymous 11 10453
Delft3D-WAVE: Non-stationary mode parameters Anonymous Anonymous 4 6595
Delft3D-WAVE: Non-stationary mode parameters Anonymous Anonymous 4 6595
Simulation (d_hydro.exe) aborts for too small history time step Roland Hesse 1 3967
TPAR boundaries and time step in output files Vincenzo Tricarico 1 2708
Problem with small time steps Imke Evers 4 7689
time step in DD Mercy Varghese 0 2024
Long-term morphological evolution (years) José González 5 4423
Problems with the salinity process Steven Sandbach 5 4868