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

grid enclosure

Benno Wachler, modified 8 Years ago.

grid enclosure


I would like to know how to create a grid enclosure file (.enc). I couldn't find it in RGFGRID and QUICKIN nor in the manuals. Thanks for help in advance!
kind regards,
Monique Villatoro, modified 8 Years ago.

RE: grid enclosure

Youngling Posts: 5 Join Date: 5/14/12 Recent Posts
Hello, did you get a response? I have also looked in the manuals and haven't found anything. Any guidance would be greatly appreciated.
Emiel Moerman, modified 8 Years ago.

RE: grid enclosure (Answer)

Padawan Posts: 84 Join Date: 3/10/11 Recent Posts

A grid enclosure file is automatically created when you save your grid file from within RGF-Grid.


Ahsan Habib, modified 5 Years ago.

RE: grid enclosure

Youngling Posts: 1 Join Date: 4/3/15 Recent Posts
If no grid enclosure is specified a default polygon is generated through the four corner
points of the numerical grid.

So, how could I create enclosure file manually from DELFT3D-RGFGRID ?

Adri Mourits, modified 5 Years ago.

RE: grid enclosure (Answer)

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

If you add/remove cells to your grid in RGFGRID and then export the resulting grid, a matching enclosure file will also be generated.

If you really want an enclosure file that encloses less cells than the default enclosure file, you will have to change that file yourself using a text editor.