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

Domain decomposition and dry cells

karunakar kintada, modified 5 Years ago.

Domain decomposition and dry cells

Padawan Posts: 35 Join Date: 7/31/12 Recent Posts
Hi all,
Good day.

I've a small question to the experts, more in particular to the developers (Hope Adri can help).

i'm using Domain decomposition in my model on a purpose (high resolution in areas of my interest) and 'm aware of auto parallelisation (for present case not an option).
i would like to know if, dry cells at the interface of two partitions has any effect. i'm getting an error saying "Wrong coupling point (95,2)." please help me out.

Thanks in advance.,
Emiel Moerman, modified 5 Years ago.

RE: Domain decomposition and dry cells (Answer)

Padawan Posts: 84 Join Date: 3/10/11 Recent Posts
Hi Karunakar,

Dry points at the DD boundary are not allowed.
However there may be other reasons for the error you're getting.
Nevertheless, first try to remove any dry points at the DD boundary to see if it solves you're problem.


Emiel Moerman