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

How to add the structure (monopile or buildings) in Delft3D?

lin li, modified 8 Years ago.

How to add the structure (monopile or buildings) in Delft3D?

Youngling Posts: 5 Join Date: 1/25/12 Recent Posts
Dear Jan-Joost,
I learned that Delft3D can be used to simulate scour around structures (as shown in the video). I guess it can also be used to simulate the scour induced by tsunami waves, which is the topic I'm very interested in. in this case, the model can be validated by several laboratory studies
1.Tonkin S, Yeh H, Kato F, Sato S (2003) Tsunami scour around a cylinder. Journal of Fluid Mechanics (496):165-192)
2.Nakamura T, Kuramitsu Y, Mizutani N (2008) Tsunami scour around a square structure. Coastal Engineering Journal 50 (2):209-246

I'd like to use Delft3d to simulate these laboratory cases, but my problems are:
I have no idea how to add the structures in the model. shall I just specify the structure area non-erodible or there is a way I can add the structure directly?
To simulate the scour phenomena, do we have to choose Z-model and non-hydrostatic model? are these improvements included in the open source version models?

Please help!

All the best!

lin li, modified 8 Years ago.

RE: How to add the structure (monopile or buildings) in Delft3D?

Youngling Posts: 5 Join Date: 1/25/12 Recent Posts
Any suggestions from experts?
Is it a correct way if I try to use weirs as the structures?