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 sediment .

Thread Started By Replies Views Last Post  
Filbal not working Devis Canesso 0 597
Difficulties with .bcm file Lucas Pion 6 1950
Sediment Simulation - TriDiag File Patrick Specht 6 3496
Flow model error when include sediment Yuwana Sriraharjo 1 1069
Model Validation Yadhunath E.M 1 847
Sediment assigned to river discharge Dianne Deauna 1 895
Stream file not found in online coupling afshan khaleghi 1 2031
Changing the Sediment Transport Routines Seyed Moin091 Mojabi 0 906
bedload does not work as SedTyp in .sed file Estelle Serrero 1 1680
Plot fluxes from observation points - QUICKPLOT Litwos L. 3 2872
Model Calibration Stefania Arciniegas 0 7569
d_hydro.exe abort after almost complet sediment simulation Roland Hesse 10 5296
Advice for setting up a morphol. model: DD vs. NestHD (vs. FM) Roland Hesse 1 3198
calculated by a wave model other than SWAN into the Delft3D hydrodynamic mo Hirejet John 0 3445
Soulsby/Van Rijn input parameters Jeff Hansen 8 6628
Morphological Model Setup | Tidal Flats Oliver Lojek 11 9423