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

Questions of model refinement and FLOW-WAVE coupling

You Yao, modified 5 Years ago.

Questions of model refinement and FLOW-WAVE coupling

Youngling Posts: 3 Join Date: 9/6/12 Recent Posts
I am new to delft-3D and I am starting a project that needs FLOW and WAVE coupling.
The DEM has 3 level of refinements (coarse, medium and fine). The finer grids are totally inside the coarser grids.
My questions are:

1. Should I use domain-decomposition or nesting to achieve the model refinement?

2. As I know, one wave model could only couple one FLOW model. I also heard domain-decomposition could not be used for WAVE. Then if I choose domain-decomposition for FLOW, should I build several corresponding WAVE models as well? If I use nesting, the grid for WAVE should be the same as FLOW or not?

3. There could be inconsistency between the DEMs of each level of refinement, Will it be a problem to the model or I need to do something to the DEMs?