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

ERROR: While copying swan.inp to waves.swn, errorcode: 5

JIN-YOUNG KIM, modified 2 Years ago.

ERROR: While copying swan.inp to waves.swn, errorcode: 5

Youngling Posts: 1 Join Date: 3/8/16 Recent Posts

I update Delft3D package to Ver. After I did I continuously getting the swan error.

Anyone can help me why I got following error?(Flow+Wave Online model)

Write SWAN depth file
Write SWAN velocity file
Write SWAN wind file
Deallocate input fields
Write SWAN input
Using SWAN hotstart file: hot_1_20151204.030000
<<Run SWAN...
*** ERROR: While copying swan.inp to waves.swn, errorcode: 5

Thank you so much.

Best regards,

Jin Young, Kim
JAZIA SATYRA, modified 8 Months ago.

RE: ERROR: While copying swan.inp to waves.swn, errorcode: 5

Youngling Posts: 18 Join Date: 11/9/19 Recent Posts
Anyone can help me why Imy ip birthday wishes tneb got following error?(Flow+Wave Online model)