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

Unibest-Swan coupling

Gwenaelle MADEC, modified 2 Years ago.

Unibest-Swan coupling

Youngling Posts: 1 Join Date: 4/23/14 Recent Posts
Dear all,
I begin with Deltares softwares and I would like coupling Unibest-CL with Swan to improve my shoreline model. I don't find in publications answers to all my questions. I hope someone can help me.
-Does Swan model correctly take into account bottom changing, after computing with Unibest? In particular to change wave conditions?
-Does someone have any knowledge of the coupling reliability in the presence of a structure, type of breakwater?
-In manual, it question of coupling with Delft-3D Wave or Flow, there is a problem if coupling is done with Swan only?

Do you have any ideas on publications titles about Swan-Unibest coupling? With if it’s possible, more precisions on coupling background?

Thank you for your help and answers.