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- Find out surge height incorporating idealized bathymetries

Gobikanthan Sathiaseelan, modified 4 Years ago.

Delft 3D FLOW- Find out surge height incorporating idealized bathymetries

Youngling Posts: 8 Join Date: 2/14/16 Recent Posts
Hi everyone,

I am testing the effects of ocean bathymetry on storm surges.

For the I created a rectangular grid using "rgfgrid" and gave bathymetry details using "quickin". Initially I maintained same depth for the entire basin.

Then I input these files to my simulation in Delft 3D Flow.

I gave 3 open boundaries for the rectangular grid.

Then I applied uniform wind field.

I gave the observation points.

After the simulation I got the results of water level.

But the problem is even if I changed the entire basin depth or value of the uniform wind, the results remain same.

Can anyone help me with this problem??

Adri Mourits, modified 4 Years ago.

RE: Delft 3D FLOW- Find out surge height incorporating idealized bathymetri (Answer)

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

With QuickPlot, you can inspect the output files, including the water depths. If you changed the water depths and you can't see changes using QuickPlot, you are probably looking in another directory then where FLOW is computing. The easiest check is to remove all created output files and run FLOW again. If the files appear, the are for certain freshly computed.