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

RE: Domain decomposition- several CPUs per domain?

KM
Katrin Mar, modified 6 Years ago.

Domain decomposition- several CPUs per domain?

Youngling Posts: 4 Join Date: 5/14/13 Recent Posts
Hello everybody,

I am currently working on a project that uses domain decomposition with five domains, using one CPU per domain.
Is there any way to use more than one CPU per domain?

I would appreciate your help!

Katrin
Qinghua Ye, modified 6 Years ago.

RE: Domain decomposition- several CPUs per domain? (Answer)

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

According to our understanding, it is NOT possible to use more than 1 cpu for one subdomain during the DD computation. It will be so intelligent to (by hardcoded) chosen based on the workload.

Regards,

Qinghua YE
KM
Katrin Mar, modified 6 Years ago.

RE: Domain decomposition- several CPUs per domain?

Youngling Posts: 4 Join Date: 5/14/13 Recent Posts
Thank you very much for your help!
OL
Oliver Lojek, modified 5 Years ago.

RE: Domain decomposition- several CPUs per domain?

Jedi Knight Posts: 111 Join Date: 4/30/13 Recent Posts
Does this mean I only get to use 1 Core or 1 CPU with multiple cores per domain? I am facing a bigger research project which entails multiple rather large domains which would be suitable for DD with Delft.

So far I have used Delft 3D runnning stand alone with 4 cores - which works fine for up to 50 000 grid nodes in 3D with Sediment, Fluidmud and Waves (runtime about 1.5 d).

What would the approach here be for making efficient use of a high performance cluster system (e.g. 1-4 Nodes with 24 CPUs per node and 8 Cores per CPU // total system capacity 342.8 TFlop/s).
Other systems familiar to me are highly parallized (UnTrim Model Family) and are easily run in parallel mode which of course faces a maximum number of CPUs depending on the speed up one achieves.

Looking forward to your reply,

cheers,
Oliver