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

can Delft3D Flow model fluids other than water?

Octavio Sequeiros, modified 9 Years ago.

can Delft3D Flow model fluids other than water?

Youngling Posts: 3 Join Date: 10/31/11 Recent Posts
I wonder if Delft3D Flow can model fluids other than water? For example air.
Considering the equations of momentum and mass conservation are the same for newtonian fluids like water and air in theory it should be possible.
If the density and viscosity of the main fluid is changed (i.e. in Physical parameters > Constants > Density, and > Viscosity) the computations should not be that far off the mark.
Anybody can comment on this, whether it is possible or not, and if positive whether there is some work on this already? And if for some reason it is not possible what software is recommended to model air in a similar way that Delft3D Flow deals with water.
Thanks in advance,
Octavio E. Sequeiros
Rafael Casares, modified 9 Years ago.

RE: can Delft3D Flow model fluids other than water?

Youngling Posts: 17 Join Date: 12/9/11 Recent Posts
That's an interesting question Octavio, but I wonder if air is a newtonian fluid (I dont know, really). Moreover, air is compressible and, opossed to water in an open channel limited at the base and both sides by a physical closed boundary and at the top by air, in an only air system those boundaries doesn't necesarily exist.

Definitly, Delft3D is not the software you require for that application.