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

Coupled Flow-Wave models stop after a single time step

Ryan Waldron, modified 3 Years ago.

Coupled Flow-Wave models stop after a single time step

Youngling Posts: 16 Join Date: 8/5/14 Recent Posts
I recently compiled D3D on a Ubuntu machine and have come across a strange phenomenon.

Examples 1,2,5, and 7 all ran fine, but 3 and 6 have given me some problems. As I am not trying to run a Water Quality simulation, I wasn't so concerned with 6 giving me a problem at this point, but I am trying to run a coupled Wave-Flow simulation so that is the problem I am currently trying to solve. I also ran my model and is got caught up the same way as example 3. Here's what happen:

D3D launches flow, the it opens wave and runs a wave simulation, wave exits, and then returns to flow, where flow computes a single time step, and then just stops. There is no error; the program doesn't exit; it just stops showing only a single time step calculated.

Does anyone know what is wrong and how I might fix this?
Qinghua Ye, modified 3 Years ago.

RE: Coupled Flow-Wave models stop after a single time step

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Ryan,

Pls attach the log file and tri-diag file here.