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 delft 3d flow .

Thread Started By Replies Views Last Post  
Dashboard problem Jin Kim 2 684
Delft3D-FLOW validation Bruna Ambrosio 0 473
Wave height limited for coastal WAVE model Akash Vijay Kumar 2 816
Run Example 3 and 4: d_hydro.exe has stopped working Daly Riandi 0 257
Couple Swash with Delft3d-flow Nora Asa 6 1697
Problematic tsunami generation - initial wave (Delft Dashboard) D Kyriakoudi 0 582
numerical instability in domain decomposition with inclined bathymetry Markus Gross 1 1759
*** ERROR: Unable to open file SWANOUT2 A D 2 3264
Error when starting simulation in FLOW Esther Espinoza 0 2459
Need help for applying D-Water Quality on 0D Fatemeh GholamiMahyari 2 3427
DELWAQ PART - Sand particle tracking John Maskell 0 1332
Delft 2 NetCDF Hemerson Tonin 7 16098
-- Niño Jhim Andrew Dela Luna 0 1080
DELFT3D GUI - Running computational program Rushawn Marshall 1 2047
Delft3D - Flow: Different data with different reference systems Sunna Kupfer 1 1488
Storm Surge - Delft3D - Space Varying Wind and Pressure Luca Castrucci 2 4049
Storm Surge - Delft3D - Space Varying Wind and Pressure Luca Castrucci 2 4049
ERROR Grid enclosure - Delft3D Flow Luca Castrucci 1 1645
Delft3D Flow: Meteo files: spherical (curvilinear) grid crashing Ron Hoeke 0 2170
Bathymetry values differ in Delft 3d compared to QUICKIN Gobikanthan Sathiaseelan 3 3033