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

Delft3D - longcrested waves

Stefanie Lorke, modified 6 Years ago.

Delft3D - longcrested waves

Youngling Posts: 2 Join Date: 5/17/14 Recent Posts
Hello all,
I want to simulate longcrested waves with perpendicular and oblique wave attack.
I know that Delft3d is used for short crested waves.
But what would be the correct input for nearly longcrested waves?
Best regards,
Guoxiang Wu, modified 5 Years ago.

RE: Delft3D - longcrested waves

Youngling Posts: 16 Join Date: 8/20/11 Recent Posts
Hi Stefanie,

I think you can try to change the frequency and directional distribution width, corresponding to gamma and DSPR in SWAN model. A larger directional spreading makes more like a unidirectional wave.

Guoxiang WU