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

Grid generation in many subbasin scenario

MH
Mark Huisjes, modified 5 Years ago.

Grid generation in many subbasin scenario

Youngling Posts: 2 Join Date: 4/21/15 Recent Posts
Hi everyone,

Currently I am writing a paper on new proposals for the Qattara Depression Project in Egypt. I want to run a simulation for the main man made lake of this project. It streches 150x150km but consists of 9 almost enclosed subbasins. The main concern is the evolution of salinity through time. I have included a very bad screenshot of my .lbd file with the flow directions in the lake.

My question is two fold:
1 What resolution is recommendable considering the fragmented nature of the lake?
2 The filling of the lake will take between 215 and 700 days depending on the scenario chosen. Is there any way to model this considering there are large deposits of rocksalt that will desolve on the floor of the depression?

http://pasteboard.co/1adRlkQM.png
Qinghua Ye, modified 5 Years ago.

RE: Grid generation in many subbasin scenario

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Mark,

Very interesting topic!

In brief,
1 What resolution is recommendable considering the fragmented nature of the lake?

The resolution depends on the details you want to extract from the model. If the mass (water volume) is the focus, the resolution might be big. We also have a lot experience on the very detailed hydrodynamic simulation with very complex land boundaries.

2 The filling of the lake will take between 215 and 700 days depending on the scenario chosen. Is there any way to model this considering there are large deposits of rocksalt that will desolve on the floor of the depression?

For deposition of rock salt which is extracted from the water, I don't think we have such a process in present Delft3D model, even though it might be not so difficult to add in. I would think if the correct source/sink term can be provided, the existing morphology module might account for the bathymetry change due to rocky salt.

I don't know if I understood your questions correctly. Correct me if not.

Greetings,

Qinghua
MH
Mark Huisjes, modified 5 Years ago.

RE: Grid generation in many subbasin scenario

Youngling Posts: 2 Join Date: 4/21/15 Recent Posts
Hi Qinghua,

Thank you for responding! Indeed the problem lies very much in the fact that to simulate the evolution of the new lake through time the FLOW module and both the WAQ and MOR modules are needed. The new lake will dramatically reshape the currently present aeolian dunes, dissolve into solution the rocksalt plateaus and precipitate out salt in newly formed bays. It seems I have my work cut out for me!

Kind regards