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 exactly 1. following the coastline and 2. cutting of where sample ends

Robert de Boer, modified 7 Years ago.

Grid exactly 1. following the coastline and 2. cutting of where sample ends

Youngling Posts: 10 Join Date: 10/18/13 Recent Posts

I am working on a model for a study project. I am fairly new to Delft3D and I have this general question. I use Delft3D and sometimes DelftDashboard for the set-up of a flow calculation. Since I have my own bathymetry I don't use DelftDashboard for that, but I still would like to incorporate some convenient features of it.

1. Is it possible, i.e. in QUICKIN or RGFGRID to formulate a rectangular grid that follows the coastline (or a maximum z-value near the coastline) in a similar easy way, like you can do in DelftDashboard?
I mean that you create a grid that stops where the bathymetry is 0m?
Is that possible, and if so, how is that possible?

2. Follow up question. Is it possible to cut the grid off where the sample (my own bathymetry, xyz file) ends on the open boundary (sea) side of the sample?
For example in QUICKIN or RGFGRID?
How I know is the best way to define a polygon that 'tries' to follow the sample best, but this is not exact.
I want that the grid has exactly the same edge, boundary as the sample. Is that possible?