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 boundary condition .

Thread Started By Replies Views Last Post  
Time-series | Input limitation Anonymous Anonymous 12 10391
boundary setup for flow Ed Atkin 6 7674
Time-varying BC in Delft3D-Waves: wavecon vs *.BCW Anonymous Anonymous 7 7542
wavecon wave spreading and water level Fajar Khaedir 1 3419
Delft3D-WAVE: Defining wave boundary conditions on a segment Anonymous Anonymous 3 5584
D3D-WAVE: Multiple segment boundaries cause runtime segmentation fault Anonymous Anonymous 0 1860
No model gradient, water won't flow downstream. Jamie Stackpole 5 1417
WW3 Spectral output: Boundary spectrum to Delft3d WAVE shanas pr 0 182
Error creating BC in DDB Isabelle Cheff 0 287
Total discharge boundary condition failure Jacob A Morgan 2 1647
boundaries problem Adelina Gaol 11 10020
boundaries problem Adelina Gaol 0 545
layer wise thin dam input Binata Roy 2 1579
How to calibrate astronomic tide forcing components? Esther Espinoza 0 2708
error during wave alone simulation, 2 different boundary conditions (TPAR) George Victor 2 1991
Issue with time zone and astronomic boundary conditions in Delft Dashboard Daniel Livsey 3 3392
Tidal phase not matching predicted Nick DiCosmo 1 980
Some questions about Dashboard Bing Zhao 2 4750
Boundary conditions in macrotidal estuary Federico Zabaleta 1 1385
Boundary conditions florian MONETTI 8 9201