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

U and V rotation

Charlene Bergeron, modified 4 Years ago.

U and V rotation

Youngling Posts: 1 Join Date: 2/29/16 Recent Posts

I am pre-processing wind data for input into our DELFT3D model. I have wind u and v components data in lat/lon (WGS84) which I would like to transform into the the projection of the model which is NZTM2000. From what I read on deltares forum and GIS forums I need to transform the u and v data to match the new projection. Basically I think I need to find the angle of difference between the old coord system and the new coord system and apply this to the u and v components?
But how do I do this exactly?
I can not find any reference or instructions anywhere on the step and formulas to do the calculations.
Any help is greatly appreciated!
Qinghua Ye, modified 4 Years ago.

RE: U and V rotation

Jedi Council Member Posts: 610 Join Date: 3/2/11 Recent Posts
Hi Charlene,

The U/V follows the direction of MN. In Quickplot you may output the UV in XY direction as well.