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

Modelling storm surge

Nora Asa, modified 10 Months ago.

Modelling storm surge

Youngling Posts: 6 Join Date: 11/20/19 Recent Posts
Hi Everybody,
I am pretty new in Delft3D . I am trying to model a nested hydrodynamic and sediment transport model coupled with wave. I would like my model to include storm surge. I have a couple of questions:
1. Other than space time varying wind data, do I need to add pressure as well in order to capture storm surge accurately?2. I have a large computational domain and I could just find some atmospheric pressure data which will be located in downstream of my model (coarse grid) however I don't have any pressure data in the estuary where I have a finer grid and local effect. Is there any resource I can find the atmospheric pressures?
3. If I want to use space varying wind on the computational domain, how can I input multiple meteo stations into to the model. Can I use multiple .wnd files or I need to interpolate all of them into one file?
Thank you in advance!