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

Threads with tag z-model .

Thread Started By Replies Views Last Post  
Z coordinates in Particle tracking usging Z-model Chao Li 7 2377
Sediment transport modelling and initial conditions with z-model option Ricardo Roman-Botero 8 8538
3D z-model: Different free surfaces in FLOW and DELWAQ Javier F Bárcena 2 2728
Is there a known BUG when using Zmodel and Temperature? Evangelos Romas 5 5601
Ztbml bug? Steven Ayres 8 4991
3D simulation of deep fjord - MPI instabilities? Ben Williams 1 2606
Unusual thermal behaviour for in-out discharge Ben Williams 1 2310
issue with salinity / tracer advection around staircase shoreline Edwin Wang 0 1859
Coupling problems using Z-Layers Manu Hoffmann 21 16069
Ztbml bug? Steven Ayres 8 4991
DD boundaries & z-model Fernando Barreto 1 2046
Estuary - locally high values of modelled constituents Dmitry Kushnir 1 1633
NaN after 2 timesteps using tag 3426 Dmitry Kushnir 3 3018 undefined symbol: mpi_initialized_ sergio rosales 5 6076
Boundary conditions for z-model Fernando Barreto 1 2496
Instability - mean depth at cell centres Richard McSherry 2 2643