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

DELFT3D-WAVE Wind file on equidistant grid

Joao Morim do Nascimento, modified 6 Years ago.

DELFT3D-WAVE Wind file on equidistant grid

Youngling Posts: 13 Join Date: 3/8/13 Recent Posts
Hello everyone,

I would like to understand something that is confusing me. I have a curvilinear grid as my computational grid. In DEFT3D-WAVE manual they have:

'This data is often defined on a different grid than the computational grid used in Delft3D-WAVE. Translating these files into files defined on the (curvilinear) grid of the computational engine is often a lengthy process and can result in huge files. This special feature facilitates the reading of the meteorological data on its own grid and interpolates the data internally to the grid of Delft3D-WAVE'

However, at the end of the equidistant descriptions they have a section saying 'restrictions'. Well, one of the restriction is:

' The meteo grid must be of the same type as the computational grid, i.e. rectilinear with grid unit = [m] or spherical with grid unit = [degree]'.

Based on this, I do not understand whether it is possible to feed DELFT3D-WAVE a wind file on a equidistant grid when your computational grid is curvilinear.

I would like someone to help me...

Thank you very much!
Adri Mourits, modified 6 Years ago.

RE: DELFT3D-WAVE Wind file on equidistant grid (Answer)

Yoda Posts: 1221 Join Date: 1/3/11 Recent Posts
Hi Joao,

The unit must be the same for both grids, i.e. both [m] or both [degree]. When your computational grid is curvilinear, the wind grid is allowed to be equidistant.

The manual is indeed not clear on this point. I improved the text (manual-revisison number 31313).

Thanks for reporting this.