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

Delft 3D FLOW Model current outputs

Ravindu Agulumaduwa, modified 4 Years ago.

Delft 3D FLOW Model current outputs

Youngling Posts: 1 Join Date: 11/28/16 Recent Posts
I have used Delft 3D FLOW model to obtain hydrodynamics in a selected domain in the Indian Ocean for my undergraduate research project. The Flow model was calibrated successfully for two stations for the water levels. But when Depth averaged velocities are extracted in a particular point in the domain, those values exist between 0.00001-0.00004 which seems to be impossible. I tried at my best to find out the reason for this case. But still couldn't be rectified it. Please be kind enough to provide me the instructions to obtain accurate current plot from Delft 3D Flow model. This is an urgent requirement. Quick response is highly appreciated.
Adri Mourits, modified 4 Years ago.

RE: Delft 3D FLOW Model current outputs (Answer)

Yoda Posts: 1221 Join Date: 1/3/11 Recent Posts
Hi Ravindu,

You need to analyse your model settings to find out why the average velocity is lower than you expect. The user manual may help you. Other options you have:
- The Deltares training courses
- Post a more detailed description on this forum, possibly with the full set of input files
- Ask someone to have a look at your model. Deltares can do that, but it's not free of charge.