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 boundary conditions .

Thread Started By Replies Views Last Post  
No model gradient, water won't flow downstream. Jamie Stackpole 5 238
Inserting a set of wave parameters to a wave model's boundary conditions Anonymous 0 56
Total discharge boundary condition failure Jacob A Morgan 2 1119
How to calibrate astronomic tide forcing components? Esther Espinoza 1 1487
Issue with time zone and astronomic boundary conditions in Delft Dashboard Daniel Livsey 3 2602
Boundary Condition Ben Müller 7 8266
error during wave alone simulation, 2 different boundary conditions (TPAR) George Victor 2 1461
Boundary conditions flow and salinity Esther Espinoza 0 2132
Boundary Conditions with HYCOM Oscar Nieto 4 2569
Instability in model Erin King 2 2197
Baroclinic simulation with sigma layers Fernando Barreto 2 2280
straight channel inlet Jacob Morgan 2 3147
Fluxes at closed boundaries Michaella Chung 0 1251
Boundary conditions in meander model Guillermo Acuña Robles 0 2038
Online flow-wave model with wave conditions specified in bcw file Ismael Xique 0 1752
Boundary conditions Francesco Enrile 2 2007
Transport Files Error in FLOW module Jake Briggs 3 3291
First River model Samuel Schroers 4 4688
QH Boundary Condition Nick Jewitt 1 2996
Tidal water level variation inside an estuary Saeed Shaeri 3 3940
Showing 1 to 20 of 36 entries.