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

Ken-ichi Nomura, modified 6 Years ago.

Youngling Posts: 3 Join Date: 3/13/14 Recent Posts
Dear All,

I would like to install delft3d version on Linux server. I have registered my account and tried svn to get the source code with following command, but it was unsuccessful.

svn checkout delft3d_repository
Error validating server certificate for '':
- The certificate is not issued by a trusted authority. Use the
fingerprint to validate the certificate manually!
Certificate information:
- Hostname:
- Valid: from Wed, 02 Feb 2011 18:20:00 GMT until Fri, 05 Feb 2016 04:29:48 GMT
- Issuer: GeoTrust, Inc., US
- Fingerprint: e5:41:6d:be:4b:98:39:15:ba:76:8d:58:f0:fc:d6:df:3f:55:71:73
(R)eject, accept (t)emporarily or accept (p)ermanently? t
svn: URL '' doesn't exist

Could anyone help me to figure out how to download the source code?

Thank you!
Qinghua Ye, modified 6 Years ago.


Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Dear Ken-ichi,

The version 1983 is located at:

Furthermore, you may use a laster tag, such as: 3185/3426 etc. The latest tag 3426 is located at:


Ken-ichi Nomura, modified 6 Years ago.


Youngling Posts: 3 Join Date: 3/13/14 Recent Posts
I was able to download the version. Thank you very much, Qinghua!