intro story Coast / Estuary

Coast / Estuary

Coastal systems are among the most dynamic physical systems on earth and are subject to a large variety of forces. The morphodynamic changes occurring to coastlines worldwide are of great interest and importance. These changes occur as a result of the erosion of sediments, its subsequent transport as bed load or suspended load, and eventual deposition. 
 
Estuaries are partly enclosed water bodies that have an open connection to the coast. Estuaries generally have one or more branching channels, intertidal mudflats and/or salt marshes. Intertidal areas are of high ecological importance and trap sediments (sands, silts, clays and organic matter).
Within the Delft3D modelling package a large variation of coastal and estuarine physical and chemical processes can be simulated. These include waves, tidal propagation, wind- or wave-induced water level setup, flow induced by salinity or temperature gradients, sand and mud transport, water quality and changing bathymetry (morphology). Delft3D can also be used operationally e.g. storm, surge and algal bloom forecasting. 
 
On this discussion page you can post questions, research discussions or just share your experience about modelling coastal and/or estuarine systems with Delft3D FM. 
 

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

 

 

Message Boards

Domain decomposition- several CPUs per domain?

KM
Katrin Mar, modified 7 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
cpu
Qinghua Ye, modified 7 Years ago.

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

Jedi Council Member Posts: 610 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 7 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!
AA
Anonymous Anonymous, modified 6 Years ago.

RE: Domain decomposition- several CPUs per domain?

Jedi Master Posts: 333 Join Date: 7/30/20 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