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

Sediment management techniques

Camila Bergmann Bergmann Goulart, modified 1 Year ago.

Sediment management techniques

Youngling Posts: 2 Join Date: 8/14/18 Recent Posts
Hello,I’m a new user of Delft3D, and I’m having some trouble with sediment simulations.

I’m trying to model sediment transport in a reservoir that has the spillway and the power station in different locations (there is an adduction channel that leads to the turbines). My goal is to simulate two sediment management techniques (flushing and pass-through), so I’m interested in downstream sediment concentration values.

To simulate the spillway and the power station, I used a hydraulic structure (in-out) combined with a thin dam. However, to do the simulation with sediments it’s necessary to inform sediment concentration values that are released by these structures, that is, in fact, my objective to find out. Is there a way to make the program recalculate these values, instead of assuming the values I determine?Attached I send the base files of the simulation.

Best regards,