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 delft3d-flow .

Thread Started By Replies Views Last Post  
Difference in time series from a history file and a map file Anonymous Anonymous 0 2446
Delft3D-FLOW: *** ERROR Deltas > water depth in TRATUR Anonymous Anonymous 4 5808
Delft3D-FLOW: Minimum layer thickness warning Anonymous Anonymous 0 4816
Online coupling FLOW & WAVE Anonymous Anonymous 1 4227
Wind Stress error in DELFT3D GUI produced MDF file Anonymous Anonymous 2 3453
Delft3D-FLOW Maximum Map Results Jeff Oskamp 1 5213
Online Wave Computation Stalling Without Error Messages Ismael Xique 0 1959
how to switch off Coriolis force in Spherical coordinate models? Guoxiang Wu 10 6627
How could I set a dam break model using Delft3D? Constanzo Marullo 3 3986
Issues with domain decomposition Jay Veeramony 5 3548
Help with Tidal Forces in Delft3D-Flow Rohit Kulkarni 0 2745
GPU - CUDA computation in Delft3D ? Bogdan Hlevca 9 10556
Storm surge modeling - inundation Robert de Boer 1 2548
Delft3D FLOW Reynolds stress output Xiaofeng Zhang 1 3143
Free Surface and Sewer Flow Module crash Drew Mahedy 1 3079
Problems compiling Delft3D on windows Constanzo Marullo 9 19058
Different results using Delft3D-FLOW version yun lang 15 9729
question about the sigma grid distribution Federico Posada 1 4430
Instability with Neumann Boundary Angang Li 1 4382
How to generate an eddy viscosity file? Rocío Jurado 4 5690