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

SWAN output files

Samantha Maticka, modified 12 Days ago.

SWAN output files

Youngling Posts: 4 Join Date: 10/2/20 Recent Posts
Hello all,

Does anyone know how to have Delft3D retain the output files from SWAN after the simulation has finished? I'm mostly interested in the PRINT file generated by SWAN. I can see this file while the simulation is running, but after the simulation is done, the file is gone and there is no *.prt file. 

I ask because I would like to see the accuracy in the simulation and whether or not the solution converges (accuracy in >98% of the domain). This leads to a second question:

Does anyone know if there would be some sort of output from Delft3D if the model does not converge on any of the timesteps? Or does it just output the results regardless of the accuracy being obtained?

Thanks to anyone in advance emoticon