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


Niño Jhim Andrew Dela Luna, modified 3 Years ago.


Youngling Posts: 5 Join Date: 8/3/16 Recent Posts
Hi to all,

I’m working on a study regarding tidal energy, and part of my study is to determine the potential peak month for the year 2017, and I intend to do this by determining the max monthly average tidal range on a certain observation point/tidal station. I have used Delft3D Dashboard/Delft3D Flow for the simulation, and I got several output files like tekal, component, and trihdat files for the tidal constituents. The tidal series itself, can be seen in the image below:

My problem is, I want to be able to determine the high and low water level (height), but it would be so time-consuming if I do that manually in MS excel (my data is for 1 yr, and there are approx. 2 high and low tides per day, with tidal heights at every 30 minutes), so I’d like to use the HILOW functionality of Delft3D-TIDE.

From what I understand from the Delft3D-TIDE manual, I need to first prepare analysis/predict input files (.ina/.inp) for HILOW, and preparing that by hand is a bit confusing. I tried using QUICKPLOT to see if I can produce a .ina/.inp file from my tidal simulation in FLOW, but I can only save my data sets into CSV/mat/tekal file types. So I would like to ask what external program or even tools in the delft3D suite can be used to generate the tidal input files .ina/.inp, because it’s a bit confusing/complicated to prepare it manually. I think there must be some external program that produces the .ina/.inp files but I have not seen it being mentioned in the TIDE manual. Any tips/advice is much appreciated.

Attached to this post are my tekal, component, and trihdat output files for reference.

Niño Jhim Andrew B. Dela Luna
Adri Mourits, modified 3 Years ago.


Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Niño Jhim Andrew Dela Luna,

Delft3D-FLOW can do this for you. This function is called "Fourier analysis", see section "A.2.30 Fourier analysis" in the manual.