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

vertical gridding

Jessica Chassereau, modified 9 Years ago.

vertical gridding

Youngling Posts: 15 Join Date: 4/21/11 Recent Posts
Good Afternoon,

Can someone please tell me how to switch between the two types of vertical grid systems in Delft3D? The 2D grid that I am trying to make 3D was originally created as a rectangular Cartesian grid.
When I turn on the vertical layering through the flow gui, is there a vertical grid type that the gui defaults to? If so, how do I switch to the other grid type?

Qinghua Ye, modified 8 Years ago.

RE: vertical gridding (Answer)

Jedi Council Member Posts: 610 Join Date: 3/2/11 Recent Posts
Hi Jessica:

In Delft3D, you have 2 types vertical grid layering, i.e., sigma layer an Z-layer. the default one is the sigma layer. If you change the model in GUI into 3D, by default, it will be a sigma layer model.

For the examples of Z-layer model, you could look for the tutorial and see how to set up a z-layer model.

Hope this might help you a bit,

Qinghua YE