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 .grd .

Thread Started By Replies Views Last Post  
Importing Land Boundary (.ldb) Moein Doostmohammadi 0 158
How to prepare inputs Grid, bathymetry, mesh on linux after install Delft3d sivaiah Borra 0 206
Run a unstructured grid on D-Waves model. Gustavo Correia 0 316
Strange display of grid in FLOW visualization area Benjamin Freudenberg 2 1046
Strange display of grid in FLOW visualization area Benjamin Freudenberg 2 1046
Delft3d WAVE grid cell centers vs corners Hannah Snow 0 3380
Grid Generation Francesco Saliani 1 1221
Grid does not display correctly in DELFT3D-WAVE A Yawer 2 2646
Develop domain with varying resolution Kristopher Calder 0 828
Grid error in Wave Ryan Waldron 2 2136
Diffrent Visualization of the same grid file in Flow and Wave modules Fuchun Lai 7 7776
Boundary conditions coordinates invalid Jeff Wilson 1 2614
.ldb to .grd? A.L. R 2 3720