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 coupled wave-flow model .

Thread Started By Replies Views Last Post  
Problem in 3D model result MD WASIF E ELAHI 0 72
Delft-WAVE wave spectra points (sp2) Chloe Sarah Sarah Morris 0 30
Getting wave outputs from DFM fetch-limited waves Sean Crosby 0 193
time-varying wave boundary conditions with bcw file for coupled flow+wave Kevin Hanegan 0 497
Erroneous FLOW Results Adjacent to Boundary John McDowell 15 3582
Validating WAVE model outputs to buoy Charlotte Lyddon 0 312
Error, Wave-Flow model using parallel run. Haneul Kang 0 466
Space-time varying wind on equidistant grids for WAVE Kapil Chandrakant Varne 1 661
Problems in FLOW/WAVE Coupling Kapil Chandrakant Varne 0 447
*** ERROR: Unable to open file SWANOUT2 A D 0 1823
Where to change breaker delay (F_lam) parameter? Sarah Margaret Trimble 0 454
Receiving error: "Wrong Coupling Point" when running Flow+Wave and DD Michael Ulmgren 1 1817
best way to setup coastal defences (groins, sewall, submeged ) Ali Masria 1 2103
VERY slow computation! Erin King 0 674
Delft3D-WAVE invalid gridfile error William Bennett 1 1093
Courant number and instability Orpita Laz 7 15717
FLOW-WAVE coupling problem Hafizur Rahman 1 1336
stopped reading wavecon file in coupled wave/flow run Claire BERAUD 1 885
Morphology model cristina viola 3 1735
Online-WAVE coupling Erin King 1 1112
Showing 1 to 20 of 44 entries.