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

Initial conditions for WAVE?

Dmitry Kushnir, modified 1 Year ago.

Initial conditions for WAVE?

Padawan Posts: 98 Join Date: 11/9/12 Recent Posts

Hi all,


Is it possible to use initial conditions for starting WAVE simulations? For instance, using hot-files from previous simulations? SWAN model allow to use hotstarts as initial conditions, but WAVE-wrapper doesn't seem to contain that functionality. This issue was discussed previously in this thread, but no progress had been made.




Christo Rautenbach, modified 1 Year ago.

RE: Initial conditions for WAVE?

Youngling Posts: 7 Join Date: 1/8/19 Recent Posts

Good afternoon,


we have the exact same problem. Does anyone have a solution? Maybe a keyword that we can or should activate through 'Additional parameters'?


Best regards,



Tiago Cortez, modified 1 Year ago.

RE: Initial conditions for WAVE?

Youngling Posts: 1 Join Date: 7/24/17 Recent Posts


I have the same problem. Anyone have any news in this process?



Christo Rautenbach, modified 11 Months ago.

RE: Initial conditions for WAVE?

Youngling Posts: 7 Join Date: 1/8/19 Recent Posts


we ended up creating an operational manual bypass. We could not figure out how to do the hot start from time step 0.