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

Waves do not grow (due to wind stress)

Daniel Miret, modified 4 Years ago.

Waves do not grow (due to wind stress)

Youngling Posts: 1 Join Date: 6/15/15 Recent Posts
Hi to everyone,

in Delft3D- WAVE (standalone), I am forcing a big area (southeast Mexico, Cuba, Jamaica, Belize, Honduras...) just with wind.
The scope is simply to see how wave heights increase with time. After several simulations H doesn't increase, but rather decreases.

Uniform wind about 30 m/s perpendicular to the coast of study has been tried. Also space varying winds have been tried.

Energy dissipation factors such as whitecapping, quadruplets, triads & diffraction have been activated and deactivated.

JONSWAP coefficient set to 0.038 m2s-3 (as suggested in WAVE manual for swell conditions).

Other factors left as default.

Can WAVE standalone generate this waves (due to wind stress), or it needs to be coupled with DELFT3D-FLOW?

Thank you