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


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  • AR
    Ata Roudgar, modified 2 Hours ago.

    undefined symbol: julian_

    1 Post 1 View
  • Adri Mourits replied 8 Hours ago.

    Compilation on Ubuntu (tag 59821): deltares_common_version_module

    5 Posts 552 Views
  • Adri Mourits replied 8 Hours ago.

    Compilation on Ubuntu 18.10

    17 Posts 1080 Views 0 Answers
  • JM
    John McDowell replied 9 Hours ago.

    Erroneous FLOW Results Adjacent to Boundary

    11 Posts 122 Views 0 Answers
  • Francesco Enrile replied 12 Hours ago.

    Online coupling FLOW & WAVE

    2 Posts 2157 Views 0 Answers
  • GS
    Gholamreza Shiravani replied 16 Hours ago.

    substance file for sediments

    6 Posts 3300 Views
  • Richard Measures replied 1 Day ago.

    Where is salinity saved in trim-file?

    2 Posts 31 Views
  • GS
    Gholamreza Shiravani, modified 1 Day ago.

    Delwaq: critical shear stress for resuspension (TaucRS1DM)

    1 Post 23 Views
  • MD
    Mohammad Daliri replied 1 Day ago.

    D-PART data field

    3 Posts 49 Views
  • AA
    Aspen M Anderson replied 28 Days ago.

    ERROR d50 < 0.0001 not allowed

    5 Posts 4732 Views 1 Answer
  • AM
    Arjen Markus replied 2 Days ago.

    Increase WAQ simulation period than Flow?

    2 Posts 32 Views
  • seth bryant, modified 5 Days ago.

    Redirect output file locations

    1 Post 23 Views
  • IP
    Ivenis Pita replied 6 Days ago.

    Implementation of bc0

    2 Posts 45 Views
  • TV
    Tulasiram Velpuri replied 6 Days ago.

    compiling error in visual studio 2015 with update 3, intel fortran i5

    Draft 2 Posts 55 Views
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