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

Online coupling FLOW & WAVE

Anonymous Anonymous, modified 6 Years ago.

Online coupling FLOW & WAVE

I have a similar question to that presented @

I am setting up a FLOW model with on-line coupling to a WAVE model.
My FLOW model uses domain decomposition to incorporate a fine resolution sub-domain within a coarser resolution main domain.
The WAVE model consists of a main domain (with the same extent as the FLOW main domain) and a nested sub-domain (a smaller extent with a finer resolution). My WAVE model uses separate computational grids to the FLOW model. The WAVE nested sub-domain has roughly the same extent as the FLOW fine resolution domain.

1) When I run the WAVE model in standalone mode I have configured it to produce outputs for both the main domain and the nested sub-domain (the keyword 'Output' = true in both [Domain] chapters). When I couple FLOW & WAVE will FLOW be able to which WAVE output files will FLOW model refer to?

2) Creating the .mdw file for the coupled model via the GUI involves selecting a FLOW .mdf file in the Hydrodynamics section (this appears as the keyword 'FlowFile' = FLOW_runID.mdf in the [General] chapter). I have the choice of selecting the coarse resolution main domain or the fine resolution sub-domain. Presumably I should select the main domain. Is my presumption correct?

Francesco Enrile, modified 1 Year ago.

RE: Online coupling FLOW & WAVE

Padawan Posts: 26 Join Date: 3/25/12 Recent Posts

Hi Rouari,


I am having the same problem. How did you solve the proble?


Thank you very much,

Francesco Enrile