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

About the url files

Gabriel Ruiz, modified 6 Years ago.

About the url files

Padawan Posts: 59 Join Date: 9/30/11 Recent Posts

Trying to understand the files that Delft 3d needs to run, does anyone know what is the role of url files? These files are created when we start a FLOW numerical simulation.

Thank you.
Qinghua Ye, modified 6 Years ago.

RE: About the url files (Answer)

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

The url file is to identify the running instance to be targeted by the remote communication module. It is not useful for a sequential running on a single computer, but for a distributed running on a cluster, or even on a network cloud.


Gabriel Ruiz, modified 6 Years ago.

RE: About the url files

Padawan Posts: 59 Join Date: 9/30/11 Recent Posts
Hi Qinhua!

I got it.
Thank you for your answer.

Kind Regards