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 estuary .

Thread Started By Replies Views Last Post  
Multi-discharge with MorMerge Wolfgang Schanderl 0 173
Validating WAVE model outputs to buoy Charlotte Lyddon 0 525
Overestimation of tidal asymmetry Menno Eelkema 0 745
How to consider sea level rise escenarios with Delft3D Flow? Esther Espinoza 7 6797
How to decide the Reflection parameter alpha value? (flow) Esther Espinoza 2 3757
Boundary conditions in macrotidal estuary Federico Zabaleta 1 1395
Refine Grid locally for river discharge Lucas Storto 3 5884
Derefine grid for improved Courant number Charlotte Lyddon 2 3721
issue with salinity / tracer advection around staircase shoreline Edwin Wang 0 1910
Tidal water level variation inside an estuary Saeed Shaeri 3 4482
Dredge activity Fernando Barreto 3 3079
The Experience on Determining The Coefficient of Viscousity and Diffusivity Santosa Putra 1 3840