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


Soroush Safaei, modified 7 Years ago.


Youngling Posts: 21 Join Date: 3/24/13 Recent Posts
hi everyone

here is my question. i don't know if this is right or not but i remeber i read it some where that i can not see the results of a flow simulation without using matlab or quickplot.
so now that i want to see the curent mag or dir, the outputs does not seem to be fine!!!i need some numbers or some vector in the graph as the direction....but it is just a graph with some topography. i can understand it but i need to have more numbers!!!
and the other thing is that how can i see wave induced currents? i want to know about the magnitude and direction!
can anyone help me?

Thanks alot
Arnold van Rooijen, modified 7 Years ago.

RE: output

Hi Soroush,

I am actually not sure what your main question is, but if you want to know about other output programs, I can tell you that I don't know many more than Matlab and Quickplot. There is also Muppet, which is also Matlab based, but can run as stand-alone version (the same for Quickplot by the way). I personally use Quickplot more for quick check of results, while I use Matlab and Muppet to make pretty figures. If you can get access to Matlab, I would definitly try. But otherwise QP and Muppet should do.

I am not sure what tool you used to plot your velocities. But with all of the above mentioned you can plot velocities both as vectors or as magnitudes. In quickplot you could use the 'add to plot' button to plot both at the same time. However, if you really want to know the numbers, I think it is best to read your results with Matlab. There is a lot of scripts available in OpenEart (, from whcih qpread.m probably the most useful one for you is. If you have loaded you results in Matlab, you can do anything with it (e.g. plot, post-process etc).

I hope this answers your question(s).