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

Delft3D Flow - error running mdf

Lumas Helaire, modified 4 Years ago.

Delft3D Flow - error running mdf

Youngling Posts: 3 Join Date: 7/4/13 Recent Posts
I receive this error when I try to a this .mdf or a domain decomposition. I get an error for the itdate. I do not have Delft3D Tide which has ASCON. This itdate format has worked before for other simulations.

*** Start of tdatom for Run: MCR_A ***
*** Simulation date: 2015-10-19 19:34:20 ***
*** ***
*** User: Portland State University 25741 ***

*** MD FLOW file used: MCR_A.mdf

*** ***
*** Deltares, Delft3D-FLOW Version, Jul 13 2009, 17:15:40 ***
*** ***

*** MESSAGE Using Unesco density formulation by default
*** MESSAGE DPUOPT found in md-file: MEAN
*** MESSAGE Momentum solver cyclic method is specified
*** MESSAGE DPSOPT found in md-file: MAX
*** MESSAGE Transport solver cyclic-method method is specified
*** ERROR Initial date 18881218 in combination with ASCON not allowed.

*** End of tdatom for model: MCR_A ***
*** 2015-10-19 19:34:21 ***