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 grid .

Thread Started By Replies Views Last Post  
Location of discharge open boundaries Ewan Sloan 0 96
Morphological Model Setup | Tidal Flats Anonymous Anonymous 11 10663
Morphological Model Setup | Tidal Flats Anonymous Anonymous 11 10663
RGFGRID | Previous Grid Anonymous Anonymous 2 3374
Error reading grid file on Linux francisco tiano 20 12685
Rotating Grid Administration Jamie Stackpole 0 150
incomplete grid generation ZIXUN ZHANG 0 176
Domain Decomposition,wrong coupling point Farshad Heidarnejad 0 193
Domain Decomposition,wrong coupling point Farshad Heidarnejad 1 368
How to prepare inputs Grid, bathymetry, mesh on linux after install Delft3d sivaiah Borra 0 244
How to convert Grid from WSG84 to UTM coordinate system? Baogan Liao 7 4653
Problems with creation of .cco and .lga files Maria C 2 1157
Strange display of grid in FLOW visualization area Benjamin Freudenberg 3 1254
Grid format for SWAN. Vector? Nate VanArendonk 0 751
Boundary conditions flow and salinity Esther Espinoza 0 2682
depth to xyz Alejandro Paladio 1 3408
Grid does not display correctly in DELFT3D-WAVE A Yawer 2 2759
Diffrent Visualization of the same grid file in Flow and Wave modules Fuchun Lai 7 8104
Error when creating grid Esther Espinoza 3 4602
Courant number and instability Orpita Laz 7 17573