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

Error Documentation/List

Mark Beggs, modified 5 Years ago.

Error Documentation/List

Youngling Posts: 3 Join Date: 11/10/14 Recent Posts
Anyone know if there is error documentation? Like a list of all the possible errors that FLOW kicks out?
Adri Mourits, modified 5 Years ago.

RE: Error Documentation/List

Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Mark,

The error messages that FLOW generates itself don't contain an error code; they should be self-explaining and are written to screen and/or tri-diag file.

But it is possible that a sub-module produces an error code that is written by FLOW. For example nefis errors. These codes are documented in the nefis manual, appendix B.