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



  • YL
    Yuanyi Li, modified 1 Month ago.

    Want a example of file for temporal and varying wind field for Flow

    1 Post 94 Views
  • LC
    Liang Chen, modified 2 Months ago.

    Promgraming error

    1 Post 75 Views
  • SS
    Samuel Schroers replied 2 Months ago.

    Neumann Boundary Condition

    3 Posts 1132 Views 0 Answers
  • CF
    Chris Flanary, modified 2 Months ago.

    Sediment variables in NetCDF history file all 0

    1 Post 82 Views
  • XW
    Xiaohui Wang replied 2 Months ago.

    PetscInitialize() must be called before PetscFinalize() (SOLVED)

    3 Posts 334 Views
  • Qinghua Ye replied 2 Months ago.

    without delft3d.sh in Ubuntu

    2 Posts 131 Views
  • SS
    Suraj Singh replied 2 Months ago.

    Boundary conditions

    9 Posts 5299 Views
  • Germán Aragón, modified 2 Months ago.


    1 Post 96 Views
  • Samuel Valentim replied 2 Months ago.


    11 Posts 4004 Views 1 Answer
  • IM
    Irene Machado, modified 3 Months ago.

    getting .xyz file

    1 Post 90 Views
  • GS
    Gerard Salter replied 3 Months ago.

    Sediment flux at inflow not matching imposed value in bcc

    2 Posts 220 Views
  • YL
    Yuanyi Li, modified 2 Months ago.

    How to determine the connection of segments in Delft3d-WAQ

    1 Post 100 Views
  • FP
    Frank Platzek replied 3 Months ago.

    numerical instability in domain decomposition with inclined bathymetry

    2 Posts 289 Views
  • LB
    Le Vu Bao replied 3 Months ago.

    error in opening delft3D in a new computer

    2 Posts 142 Views
  • RK
    rajan kumar replied 3 Months ago.

    missing wave.exe file

    10 Posts 11068 Views
  • GP
    Giovanni Panga, modified 2 Months ago.

    Tclkit is not responding

    1 Post 156 Views
  • MG
    Markus Gross replied 3 Months ago.

    Domain Decomposition, wrong coupling point

    5 Posts 2944 Views
  • LB
    Le Vu Bao replied 3 Months ago.

    PLCT crashes when I try to save the files

    9 Posts 810 Views
  • PD
    Peng Dai replied 4 Months ago.

    Domain Decomposition

    5 Posts 8439 Views 1 Answer
  • Kapil Chandrakant Varne replied 4 Months ago.

    03_flow-wave example errors

    4 Posts 7250 Views
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