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 in mclFreeStackTrace" Quickplot

Agustín Ríos, modified 2 Years ago.

"Error in mclFreeStackTrace" Quickplot

Youngling Posts: 3 Join Date: 7/6/16 Recent Posts


I've been working for over a year with Delft3d 4 for my thesis. In the last few weeks, when I try to open Quickplot, I often get this error: "Error in mclFreeStackTrace". Sometimes it fixes by itself, but then fails again. 

Any idea what the problem might be?

Any help would be greatly appreciated, as this problem is delaying my work.

Thank you in advance,
Agustin Rios

Anonymous Anonymous, modified 2 Years ago.

RE: "Error in mclFreeStackTrace" Quickplot

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts

Thumbs up for Meddy! Had the same issue; working on your thesis while not getting to start QuickPlot can be maddening :)