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! 

 

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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.

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** PLEASE TAG YOUR POST! **

 

 

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

 


Message Boards

Refine Grid locally for river discharge

LS
Lucas Storto, modified 3 Years ago.

Refine Grid locally for river discharge

Youngling Posts: 4 Join Date: 8/24/16 Recent Posts
Hello,

I'm currently trying to create a grid for the Rio de la Plata estuary using Delft3d's RGFGRID. The problem is there are several river discharges into the estuary (see image below) and I can't find a way to locally refine the grid made out of splines to take them into account.








What would be the best way to include those river discharges into the grid? I'll attach the landboundary and spline file below

Thank you for your time,
Lucas
Dmitry Kushnir, modified 3 Years ago.

RE: Refine Grid locally for river discharge

Jedi Knight Posts: 107 Join Date: 11/9/12 Recent Posts
Hi Lucas,

I think you should put your splines more closely together (see attachment). They're seem to be sparsely located.

Regards,

Dmitry
LS
Lucas Storto, modified 3 Years ago.

RE: Refine Grid locally for river discharge

Youngling Posts: 4 Join Date: 8/24/16 Recent Posts
Dmitry,

thanks for your answer! It was just what I was looking for.

Now, just out of curiosity, I was also trying to solve it using multiple grids attached by DD Boundaries (image below)
Is it also a valid way to build the grid? Or it will cause differences with the method you describe?
Thank you for your time



Regards, Lucas
Dmitry Kushnir, modified 3 Years ago.

RE: Refine Grid locally for river discharge

Jedi Knight Posts: 107 Join Date: 11/9/12 Recent Posts
Lucas,

It might be worth trying multiple DD-grids if you focus specifically on these areas and want a higher resolution there.
Be aware that this is more complicated technique compared to single domain simulation.
For instance, for every DD-grid a separate set of input files (.grd, .mdf etc.) have to be prepared, each domain is supposed to run in a separate thread on a multi-core PC (or cluster) and different files with simulation results will be generated for each domain. See appendix B.14 of FLOW user manual for more details.

Regards,

Dmitry