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

Boundary Conditions with HYCOM

Oscar Nieto, modified 4 Years ago.

Boundary Conditions with HYCOM

Youngling Posts: 2 Join Date: 2/29/16 Recent Posts
Hello everyone.

I'm following an example of Delft3D webinars, the one of San Diego Bay.
Instead of using the boundary conditions created with the Delft Dashboard I want to use the output of the HYCOM model.

Reading the instructions that the Dashboard writes on the command line, I realized it uses a kind of networking protocol (OpenDAP) to extract the information directly from the server of the TPXO model to create the astronomic boundary conditions.

I have no idea how to this.
I apreciate any kind of help.

Emiel Moerman, modified 4 Years ago.

RE: Boundary Conditions with HYCOM

Padawan Posts: 84 Join Date: 3/10/11 Recent Posts
Hi Oscar,

I think there is an option to use Delft Dashboard to do this also. However as a far as I know this is not an open and released option.
What you can do alternatively is go to the HYCOM website and download the data, whatever you are interested in and download a netcdf of this.
With Matlab you can subsequently load the netcdf file and data and write this to a boundary conditions file (type of your choice, e.g. with the Open Earth Tools function delft3d_io_bct.m to make a time-series).
Anyway it will be quite some work to make it specific for your case.

Hope this helps you on the way somewhat.

Oscar Nieto, modified 4 Years ago.

RE: Boundary Conditions with HYCOM

Youngling Posts: 2 Join Date: 2/29/16 Recent Posts
I apologize for the late reply.
This information was very usefull.

Thank you Emiel.
Tony Lee, modified 3 Years ago.

RE: Boundary Conditions with HYCOM

Youngling Posts: 9 Join Date: 4/1/17 Recent Posts
Excuse me, did you succeed in getting boundary condition from hycom netcdf data for delft3d?
Dmitry Kushnir, modified 3 Years ago.

RE: Boundary Conditions with HYCOM

Jedi Knight Posts: 107 Join Date: 11/9/12 Recent Posts
Hi Emiel,

Is there a dedicated toolbox in Delft Dashboard for generating FLOW boundary conditions based on HYCOM data?
If there is, can it be shared with open-source users?