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

I want to run example case.

Jaegab Cho, modified 7 Years ago.

I want to run example case.

Youngling Posts: 4 Join Date: 4/4/13 Recent Posts
I compiled Delft3D on Linux.
And I'd like to run examples/01_standard.
(Ref. Doc. is Webinar Baart, 2012. How to compile Delft3D under Linux)

But it can't be work.

I typed "deltares_hydro.tcl config_flow2d3d.ini"
And displayed message is below === to ===.

Executing "/home/jgcho/DELFT3D/ TMP_config_flow2d3d_28548.xml" ...
Deltares, FLOW2D3D Version, May 31 2013, 09:28:30 entry Flow2D3D::Run

Part I - Initialisation Time Dep. Data module...
runid : f34
Part II - Creating intermediate files...
Part III - Initialisation of the Execution module...
Part IV - Reading complete MD-file...

ERROR: d_hydro.exe: oc.c:159: create_nefis_files: Assertion `(BUInt8) -1 == (size_t)(BUInt8) -1' failed.
- Starting "d_hydro.exe" may give more information:
- Run "deltares_hydro.exe <INI-inputfile> -keepXML".
- Run "d_hydro.exe TMP_config_flow2d3d_<processId>.xml".

Please check this.
Adri Mourits, modified 7 Years ago.

RE: I want to run example case. (Answer)

Yoda Posts: 1221 Join Date: 1/3/11 Recent Posts
Hi Jaegab Cho,

It seems that your system is a 32bit system and you compiled a 32bit version. This won't work; it's a known bug. See the release notes for more details. Can you switch to a 64bit system and compile using 64bit compilers and tools?