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

Wind Stress error in DELFT3D GUI produced MDF file

Anonymous Anonymous, modified 7 Years ago.

Wind Stress error in DELFT3D GUI produced MDF file

The WStres parameters in an MDF file created by the DELFT3D-FLOW GUI (version issued with version 4.01.00.rc.03 of the main GUI) are not recorded correctly. It appears that any changes to the values for Break Point C in the /Physical Parameters/Wind Drag Coeff/ table [i.e. Break Point C coefficient and wind speed] are not written to the .mdf file when saving or exiting the FLOW GUI.
chris gabriel, modified 7 Years ago.

RE: Wind Stress error in DELFT3D GUI produced MDF file

Youngling Posts: 9 Join Date: 4/29/13 Recent Posts
We noticed the same. When you change break point A or B, the save mdf file menu item becomes active, when you change C, it stays greyed out. If you change a combination of C and A and/or B, the bottom becomes active and you can save the file, but neither of the values for breakpoint C get written to the file. Unless that value pair is constant for all use cases (very unlikely), this seems like a bug.
Meo de Rover, modified 7 Years ago.

RE: Wind Stress error in DELFT3D GUI produced MDF file

This bug has been fixed in version 3.50 which will become available in the next release.