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


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Threads with tag neumann boundary .

Thread Started By Replies Views Last Post  
Zero flux at boundary Moein Doostmohammadi 0 97
Defining Neuman BC based on offshore forcing hani ramadhan 19 3906
Neumann B.C Moein Doostmohammadi 2 657
Boundary Condition Ben Müller 7 9599
Water loss through boundary Johnny Coyle 1 3333
Running neumann with harmonic boundary types in linux parallel Balaji Angamuthu 6 4074
Neumann Boundary for Delft-Flow model ? Thomas SAILLOUR 9 10225
Using Boundary condition in Delft3d model Michael Clarke 10 18878
Boundary doubt Teresa Vidal-Juárez 2 2294
Instability with Neumann Boundary Angang Li 1 4215
Unstable boundary using Neumann BCs Susan Clark 2 5087