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


Rajkapoor Sharma, modified 4 Years ago.



I am new to Delft software. I am planning to use Delft 3D for some morphology project. My queries are:

1. For simulation kernel I will download it from Will it be ok. I have also found Revision 6268 in What is the difference?
2. It is written that the log of tag "2367" reads:
DELWAQ Version
Delft3D-FLOW Version
Delft3D-WAVE Version

Can you plz give exact location and name of log in tag 6118.
3. I think Delft 3D in tag 6118 also covers Morphology. Is there any way to check that.

Thanks & Regards

Rajkapoor Sharma
Adri Mourits, modified 4 Years ago.

RE: Delft3D (Answer)

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

1. Tag vs trunk:
A tagged revision is a fully tested, stable revision from the trunk. Bug fixes, improvements etc. are added to the trunk and may cause damages. Therefore the safest version to use is the latest tagged version, currently

2. log of tag
Use the SVN Repo-browser, select, right-click and select "show log" will result in:
From OSS trunk rev. 6118:
DELWAQ Version
PART Version
Delft3D-FLOW Version
Delft3D-WAVE Version

3. Morphology
Currently, morphology is part of Delft3D-FLOW, so when you download the code, for example from, then morphology is included. There is no simple method to check/include/exclude this.