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

Problem compiling on Mac: missing module files

Peter Yeates, modified 4 Years ago.

Problem compiling on Mac: missing module files

Youngling Posts: 1 Join Date: 1/11/16 Recent Posts

I'm having an issue compiling delft3d on my Mac (OS X Yosemite 10.10.5). I've attached my error message below

use globaldata
Fatal Error: Cannot read module file 'globaldata.mod' opened at (1), because it was created by a different version of GNU Fortran
compilation terminated.

I don't appear to have prepared the necessary include folders (e.g. /utils_lgpl/precision/packages/precision/src) and I have not been able to determine what steps I have missed.

I realise there is limited support for Mac users but if someone could point me in the right direction that would be great.

Adri Mourits, modified 4 Years ago.

RE: Problem compiling on Mac: missing module files

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

The error message suggests that file 'globaldata.mod' was already present, created by another compiler, and that the current compiler can not read it. This should be solved when you delete this file. Your current compiler will generate it himself.

You might run into more of this type of problems. Be sure that you started with a clean checked out version.