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

Wave spectra from uniform wind field

Chelsea Volpano, modified 7 Months ago.

Wave spectra from uniform wind field

Youngling Posts: 1 Join Date: 6/26/19 Recent Posts
Hi All-
I was wondering if there is a way to generate a wave field from *only* time-series wind data using Delft3d. I am new to modelling & any help would be appreciated.
Is there a best-practice way to output spectral wave data from a low resolution grid for use as boundary conditions to a high resolution grid? My ultimate goal is to analyze sediment transport in Delft3d and morphological evolution in Xbeach over a period of weeks~months.
The site I am hoping to model (~1km of coast) does not have any wave buoys nearby, only meteorological stations. The site is in Lake Michigan, which has 2 buoys (both ~170km from my site) which are recovered in winter. Am I better off using this data to run a basin-wide model and nest grids? How would the winter data-gap be overcome?
Thanks very much for your input