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 d3d wave .

Thread Started By Replies Views Last Post  
file 'norm_end' expected to signal a correct swan calculation George Victor 0 762
Space-time varying wind on equidistant grids for WAVE Kapil Chandrakant Varne 1 661
Where to change breaker delay (F_lam) parameter? Sarah Margaret Trimble 0 454
VERY slow computation! Erin King 0 675
Guidance on application of time and space varying 2D spectra in Delft3DWave Kit Stokes 4 1951
error during wave alone simulation, 2 different boundary conditions (TPAR) George Victor 2 1376
Delft3d WAVE grid cell centers vs corners Hannah Snow 0 2847
Grid format for SWAN. Vector? Nate VanArendonk 0 477
Issue with Flow-Wave online coupling Maumoon Saleem 1 1228
Standalone wave model/ coupled with FLOW Jonathan Ray Abat 7 4764
difference between dissipation 3d and dissipation seyed moin mojabi 0 1803
Waves do not grow (due to wind stress) Daniel Miret 0 1181
Space-varying bottom roughness online Wave Timor Post 3 2516
Boundary file Renan Ribeiro 8 9131
D3D-WAVE: Coupled simulation yields unexpected outputs Ruairi MacIver 3 5440
Input Conversion error Prashansa Madison 7 11250
What version of SWAN is D3D WAVE 3.05.30013 based on? Ben Williams 3 3238
What version of SWAN is D3D WAVE 3.05.30013 based on? Ben Williams 3 3238
Iinternally limited max wind speed when using instationary D3D WAVE? Ben Williams 0 2121
Showing 1 to 20 of 20 entries.