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

Space-varying bottom roughness online Wave

Timor Post, modified 4 Years ago.

Space-varying bottom roughness online Wave

Youngling Posts: 1 Join Date: 2/9/15 Recent Posts
Hi all,

I built a flow model with multiple domains and Online D3D-WAVE and I would like to incorporate space-varying bed roughness. I have read in the WAVE manual that it is currently not incorporated in WAVE (under A.2.7 of the WAVE manual).

However, I have also read that it is possible using a workaround:;jsessionid=A2F89A553F3CD0084AF70627B12A02A4#_19_message_440644

But, does this also work in combination with FLOW?

Any tips on how to accomplish this is welcome!

Qinghua Ye, modified 4 Years ago.

RE: Space-varying bottom roughness online Wave

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Dear Timor,

I don't think there is further way to walk around than the link you listed. Emiel gave a good answer.


Curtis Swanepoel, modified 3 Years ago.

RE: Space-varying bottom roughness online Wave

Youngling Posts: 11 Join Date: 4/4/16 Recent Posts

Did you use the method outlined by Emiel? Could you explain how you did it? I initially made a space varying bottom roughness using quickin and the mannings n coefficient
tyron woodley, modified 23 Days ago.

RE: Space-varying bottom roughness online Wave

Youngling Posts: 9 Join Date: 3/14/20 Recent Posts
This is very simple process,first follow the simple step and install the bing web browser clear bing search history bing is most famous using web browser,i am sure you can easy to using.