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


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Threads with tag delwaq .

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Delwaq publications Anonymous Anonymous 0 1957
Error running DELFT3D-WAQ Priscila Vargas 0 552
Model dimensions too large for DELWAQ Stefan Mirbach 2 1048
Problems with .tim file - substance discharge FLOW and WAQ José Rafael Cavalcanti 10 5746
ERROR: Binary/unformatted file does not have the correct size Ernesto Molinas 2 1503
Error in running delwaq2 Yongbo Zhou 11 6499
Delwaq input file joe rahi 0 972
Agent-based model or Individual-based model in Delft3D Serene Tay 0 888
Z model and D-waq Fernando Barreto 1 2837
delwaq1 error reading block 5 Zhanxian Wang 40 19795
DELWAQ coupled with z-layer Delft3D FLOW model? Zhanxian Wang 9 6222
run DELWAQ on a cluster? Zhanxian Wang 7 5288
Need help for applying D-Water Quality on 0D Fatemeh GholamiMahyari 2 3431
DELWAQ PART - Sand particle tracking John Maskell 0 1332
Problem with coupling a ddb file fateme Mahyari 13 8195
[GUI 4.02.03] Issues with PLCT, segment file, DD couple Julio Werner Yoshioka Bernardo 1 1993
point source waq Karoline Wischnewski 1 1678
delwaq1.f: Fortran runtime error on line 548 (examples 06 and 10) Riccardo Navarra 6 5920
Missing delwaq1.exe Yingxuan Chen 1 1686
Coupling D-Flow with Waq Leandro Vaz 0 2839