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

Latitude of project site - GUI

Jonathan King, modified 4 Years ago.

Latitude of project site - GUI

Youngling Posts: 16 Join Date: 9/8/15 Recent Posts

I appreciate this may be a very straight forward question with an obvious answer but I can't find it in any of the user manuals.

When using the GUI to create a new FLOW MDF, in the Data Group Domain sub-data group Grid to which point in the domain does latitude refer?

The overall domain I am looking at is very large, ranging from latitude 53deg and 54deg. I have attached a screenshot of the domain and the GUI to show clearly what I am referring to.

Qinghua Ye, modified 4 Years ago.

RE: Latitude of project site - GUI (Answer)

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Jon,

So for Cartesian system, you have to specify the latitude by yourself. If the grid range is too big, you may think of using the Spherical system. Specificly in your case, in my opinion, you may specify the latitude to be 53.5, still using Cartesian system. The error should not be significant.

Hope this might help,

Jonathan King, modified 4 Years ago.

RE: Latitude of project site - GUI

Youngling Posts: 16 Join Date: 9/8/15 Recent Posts
Hi Qinghua,

Thanks, I've gone for 53.7 which is almost exactly the center of the domain and the latitude of the area I am particularly interested in.