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 nefis .

Thread Started By Replies Views Last Post  
NEFIS files are bad, warnings in compilation Jorge Abramian 2 591
Long computation times while writting to netCDF. João Lencart e Silva 4 2016
I don't understand install of Delft3D on Fedora 20 Tecprog World 1 2192
Issue with Flow-Wave online coupling Maumoon Saleem 1 1649
Compiling nefis in Linux/OSX Pedro Magaña 16 13772
Post Processing with Python Justin Pringle 3 9188
vs_use for python Luther Terblanche 0 1298
Units of concentration variables in "R1" of "map-series" Luther Terblanche 0 3477
DELWAQ Conversion NEFIS to NetCDF Stephanie Zeunert 14 12732
wrong GSQS (area of computational grid cells) in output Timo de Ruijsscher 3 2806
D3D flow stops in OpenDA calibration without any obvious reason Markus Promny 1 2948
"Pollutants and tracers" and NEFIS Hemerson Tonin 3 4091
"Pollutants and tracers" and NEFIS Hemerson Tonin 3 4091
reading output files without matlab veli yumruktepe 6 15047