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: 
/web/delft3dfm/forum

Post your questions, issues, suggestions, difficulties related to our Delft3D Flexible Mesh Suite on the new forum.

=======================================================

** PLEASE TAG YOUR POST! **

 

 

Sub groups
D-Flow Flexible Mesh
DELWAQ
Cohesive sediments & muddy systems

 


Message Boards

User defined sediment transport formulae (.dll file)

GL
Gabriel Lim, modified 3 Months ago.

User defined sediment transport formulae (.dll file)

Padawan Posts: 32 Join Date: 5/5/18 Recent Posts
Hello,

I am trying to incorporate my own suspended sediment concentration formulae (Ca) into the Delft3D-FLOW module using the .dll file (as indicated in Appendix B.9.4). I have only developed a new Ca model, not suspended sediment transport rate or the bedload rate, etc.

Do I need to include a set of equations for sediment transport rates (for both suspended load and bed load) as well in the .dll file? Or only the new Ca formula? Ideally I would like to replace ONLY the Ca model and continue to use the default models for all other processes..

Also, for example, I see the reference concentration is used to compute sink/source terms, and also erosive flux due to upward diffusion, etc. Will the software automatically use my new Ca model if I call it in using the .dll file? I do not really understand how the process works (despite having read the section in Appendix B.9.4) Please advise! Any help would be much appreciated!

Thanks,
Gabriel
Adri Mourits, modified 2 Months ago.

RE: User defined sediment transport formulae (.dll file)

Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Gabriel,Once you're using a transport formula in your own .dll file, you have to specify all the sediment transport rates. There are two ways to do this:
  1. Copy the source code of the default formulas into your code that you use to build your own .dll file.
  2. Forget about using your own .dll file; just change the Ca formula inside the default code.
Looking to subroutine eqtran, line 738 and further: the "ssus" from your .dll file is indeed transformed into a reference concentration and used further on.Regards,Adri
GL
Gabriel Lim, modified 2 Months ago.

RE: User defined sediment transport formulae (.dll file)

Padawan Posts: 32 Join Date: 5/5/18 Recent Posts
Hi Adri,

I see. When taking the first option you suggested, is there somewhere where I can find the source code of the default formulas?
Is it the tram1.f90 in src\utils_gpl\morphology\packages\morphology_kernel\src directory?

Thanks again,

Gabriel
BB
blanky blankiya, modified 9 Days ago.

RE: User defined sediment transport formulae (.dll file)

Youngling Posts: 2 Join Date: 11/11/19 Recent Posts
I am trying to incorporate my own suspended se snaptube telegram web  concentration formulae (Ca) into the Delft3D-FLOW module using the .dll file (as indicated in Appendix B.9.4). I have only developed a new Ca model, not suspended sediment transport rate or the bedload rate, etc.