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

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

Yuanyi Li, modified 2 Years ago.

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

Hi, every one,

I am trying to set a model for a coastal sea considering the wind and waves. I want to use the temporal and spatial varying wind fields to drive the hydrodynamic model. So I think I need a file for this according the instruction in Section A2.8.1 in Delft3D-Flow manual. However, I still get the error which indicated the it cannot read the quantity 2 correctly.  In my case, there is 361 grid nodes in M-direction and 241 grid nodes in N-direction. The attachment is the file I used. Could any one tell me what worry with it?

Thank you