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

unable to compile delwaq

Seyoum Gebremariam, modified 1 Year ago.

unable to compile delwaq

Youngling Posts: 1 Join Date: 2/24/15 Recent Posts

I am unable to compile delwaq on windows 7 pc using visual studio 2008 and Visual Intel Fortran compiler 11.1 and I am hoping someone will help me out.

I added waq projects to existing d_hydro_open_source.sln project as shown in the webinar files. When building the project, however, almost all projects were successfully compiled except waq projects shown. I tested the recent TRUNK as well as previous tagged versions. Build configuration was set to win 32 release.

It generated numerous warnings and errors that include:

LINK : fatal error LNK1181: cannot open input file 'delwaq1_lib.lib'
LINK : fatal error LNK1181: cannot open input file 'delwaq2_lib.lib'
LINK : fatal error LNK1181: cannot open input file 'waq_io.lib'
G:\Delft3d_Trunk\src\engines_gpl\waq\packages\delwaq2_lib\src\waq_omi_lib.f90(153): error #6460: This is not a field name that is defined in the encompassing structure.
G:\Delft3d_Trunk\src\engines_gpl\waq\packages\delwaq2_lib\src\waq_omi_lib.f90(166): error #7002: Error in opening the compiled module file. Check INCLUDE paths.
G:\Delft3d_Trunk\src\engines_gpl\waq\packages\delwaq2_lib\src\waq_omi_lib.f90(427): error #6366: The shapes of the array expressions do not conform.

Thank you in advance.