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

Water level simulation with astronomic components are the same

Esther Espinoza, modified 3 Years ago.

Water level simulation with astronomic components are the same

Padawan Posts: 25 Join Date: 4/6/17 Recent Posts
Hi, first of all sorry if this is too obvious to ask.

I want to model water level using astronomic components for april and june of the same year for the open boundary, because I also want to simulate water level but using time series data for the same months (tide gauge data) in order to obtain the difference between both series which would be the meteorological tide. However, the results for both months, april and june, using the astronomic components are exactly the same so the highs and lows do not coincide with the results simulated with the time series data. I did two simulations with the astronomic components, one for each month. So, how do I make the model consider time for each month?

Then, I did just one simulation from april to june which obviously took more time. The results for april and june were different but the phase lag was not gone, even though it was reduced a little bit I can't use those results to obtain the meteorological tide. How do I solve this? Is it necessary to simulate the whole period in one simulation? What about if I want to simulate the same month for two different years? I will take a lot of computational time for that.

The astronomic components for both months were almost the same, there was no considerable difference.

Prado Jonas, modified 11 Months ago.

RE: Water level simulation with astronomic components are the same

Youngling Posts: 1 Join Date: 3/5/20 Recent Posts
Thanks for sharing this wonderful information