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

Vertical flow profile

Phil Shepperd, modified 5 Years ago.

Vertical flow profile

Padawan Posts: 33 Join Date: 5/31/11 Recent Posts
Hello everyone,

I am trying to better understand the vertical velocity profile in FLOW depth averaged simulations. From the manual all i can gather is that it is logarithmic.
The reason for this question is that I am getting very accurate "depth averaged velocity" predictions in my simulations, but need to factor them so that I can present the client with velocities at particular heights above the seabed.

At some point in the future the study will move to 3D, but for now it's all about long simulations and annual predictions, so that is not an option at this stage.

Thanks in advance


Phil Shepperd
Independent Consultant
Melih Kosucu, modified 5 Years ago.

RE: Vertical flow profile

Youngling Posts: 1 Join Date: 2/11/15 Recent Posts
Hello Phil,

At the 594-596 pages of the Delft3D-Flow Manual, there is a sufficient information about how it is become a 3D model. However, only Z-Model based 3D model can be done by this information.