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

stopped reading wavecon file in coupled wave/flow run

Claire BERAUD, modified 2 Years ago.

stopped reading wavecon file in coupled wave/flow run

Youngling Posts: 5 Join Date: 1/5/16 Recent Posts

I am slightly confused as my coupled FLOW/WAVE run was running fine until time ~28800minutes in wavecon. But then the following wavecon conditions are not read anymore, and not used in the calculation. FLOW finished until the end of the simulation, while WAVE stopped where wavecon stopped being read.
I cannot see any keyword in the WAVE steering file specifying a calculation end time, nor an error explaining why wavecon stopped being read. Conditions in wavecon around time 28800 are not changing dramatically, so I cannot infer an instability.

Would you have any idea why it stopped reading wavecon?

Please find attached the FLOW/WAVE log file and the wavecon file.

Qinghua Ye, modified 2 Years ago.

RE: stopped reading wavecon file in coupled wave/flow run

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

From the tri-diag file, you can find which exact time of wave condition has been used in the simulation.

For a flow-wave coupling simulation, the wave running time point is determined by flow. For example, if flow setting says, from 0 to 28800, to run wave every hour, then wave will be started every hour. When wave running, it will look into the wavecon file and set the boundary. Thus I would suggest you to check the flow setting again.