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

How to change whitecapping settings

Hannah Snow, modified 4 Years ago.

How to change whitecapping settings

Youngling Posts: 3 Join Date: 9/3/15 Recent Posts

I want to change the whitecapping settings in WAVE - I know this is possible in SWAN, but I don't know the proper keywords to use in the additional parameters section.

Can anyone please let me know how to adjust the Komen whitecapping coefficient?

Thank you!
Emiel Moerman, modified 4 Years ago.

RE: How to change whitecapping settings

Padawan Posts: 84 Join Date: 3/10/11 Recent Posts
Hi Hannah,

Not all option of SWAN are fully included in Delft3D-WAVE. You can however modify the swan input manually outside of the GUI and *.mdw file if you want.
Have a look a different discussion on the forum doing something like this but for the spatially varying roughness field:;jsessionid=B31582A887691D6F6F618BC6DBD1FBAB