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

Multi-discharge with MorMerge

Wolfgang Schanderl, modified 5 Months ago.

Multi-discharge with MorMerge

Youngling Posts: 1 Join Date: 6/23/20 Recent Posts
Dear all,

I do morphodynamic long-term simulations of an estuary. I've already done some simulations using the morphological acceleration. Now I want to re-do these simulations using mormerge and compare the results. However, I've met two issues:

(i) The multi-event in the official mormerge-implementation is waves. However, in my flow case, waves are of minor importance. Way more important (and fluctuating) is the discharge of the river into the estuary. Is there an easy way to adapt the mormerge in such a way that the multi-event is not waves, but several point sources or inflow boundary conditions? Has anybody put some effort in doing this already (and is willing to share)?
(ii) The official mormerge-implementation is not parallelized. Has anybody done this already (and is willing to share)?

Thank you for your help!