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 problem

Alejandro López-Ruiz, modified 9 Years ago.

Domain Decomposition problem

Youngling Posts: 1 Join Date: 10/14/11 Recent Posts

I'm creating the setup for a Flow case with a Domain Decomposition and two grids and the corresponding mdf files.
Each mdf works properly and I've create the .dbb and the .inp files according to the Flow manual, but when I start the DD run, this message appears after checking of parts I to VI of the mdf files:

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

I'm using only two grids with one DD Boundary, can I do something to solve this problem?

Thanks in advance,

Octavio Sequeiros, modified 9 Years ago.

RE: Domain Decomposition problem

Youngling Posts: 3 Join Date: 10/31/11 Recent Posts
Hi Alex,
I have experienced similar problems with that and other error messages while running DD. Most probably the issue is with the inp file (or batch file). Are you running in Wiindows of Linux?
Send me your inp file and batch file and I will have a look.
Roberto Fontes, modified 8 Years ago.

RE: Domain Decomposition problem

Youngling Posts: 5 Join Date: 5/19/11 Recent Posts
Hi Alejandro,

have you straight fully followed the requirements for domain decomposition coupling?
As far as I remember, we should bear in mind that:

1. depth value must be the same in the neighbor points at the DD boundaries;
2. the time step should be the same, for the two .MDFs (the smaller prevails over the bigger);
3. check orthogonality after the domain coupling;
4. there is no need of boundary condition definition at DD boundaries.