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

FLOW DDBoundaries + WAVE Nesting

JF
João Paulo Ferreira, modified 4 Years ago.

FLOW DDBoundaries + WAVE Nesting

Padawan Posts: 32 Join Date: 10/16/15 Recent Posts
Hello everyone.

I wonder if it is possible to run FLOW DDBoundaries (multiple domains) with the coupling WAVE Nesting (also multiple domains).

Example:
FLOW DDBoundaries
Created four grids being 1 (less refined) to 4 (finer). I respected the limit of 1 to 3 and division alignment grids.
Begotten 4 files ".mdf". In each is on the "Wave" and "Online Delft3D-WAVE" and was assigned a time value for the communications file.
I generated the ".ddb" to run with DDBoundary.


WAVE Nesting
I generated the other grids 4, 1 (less refined) to 4 (finer).
It can create only one ".mdw" when does Nesting between the grid that are embedded each other, different grids in FLOW.
That ".mdw" you can choose only one ".mdf" of 4.
So, what I would choose more or less refined than FLOW?


This type of simulation work?

I managed to run, but I don't know if this is the correct way.

Thank you!
Regards
Adri Mourits, modified 4 Years ago.

RE: FLOW DDBoundaries + WAVE Nesting

Yoda Posts: 1221 Join Date: 1/3/11 Recent Posts
Hi Joao,

Yes, this works. When FLOW and WAVE are started, FLOW sends the runids of all DomainDecomposition subdomains to WAVE. WAVE echoes this to the screen.

It may look a bit strange that the (only) .mdw file can only refer to one .mdf file. This is used by the WAVE-GUI (for example, if you want to use wind information from FLOW, does the FLOW simulation contain wind) but not during the computation itself.

Regards,

Adri
JF
João Paulo Ferreira, modified 4 Years ago.

RE: FLOW DDBoundaries + WAVE Nesting

Padawan Posts: 32 Join Date: 10/16/15 Recent Posts
Thank you, Adri Mourits.

Just one more question.
Within the ".mdw" (WAVE GUI), I can connect to any FLOW ".mdf"? Regardless if ".mdf" more or less refined?

Thank you again.
Adri Mourits, modified 4 Years ago.

RE: FLOW DDBoundaries + WAVE Nesting

Yoda Posts: 1221 Join Date: 1/3/11 Recent Posts
Hi Joao,

Yes, that's correct.

The WAVE-GUI helps you to prepare your input. The result is a set of input files. After that, you are free to modify the input files, with or without GUI. The final checks are performed by the kernels themselve (Delft3D-FLOW and Delft3D-WAVE). You don't have to use the GUI as long as the kernels are happy. When a kernel runs into a problem it might help to open the input files in the GUI to have it checked.

Regards,

Adri