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

Running DELWAQ with OpenMP

JL
João Lencart e Silva, modified 7 Years ago.

Running DELWAQ with OpenMP

Padawan Posts: 71 Join Date: 3/30/11 Recent Posts
Hi All,

I looked in the examples and the manual for how to start an OpenMP run of DELWAQ but couldn't find any clue...
I tried setting the
OMP_NUM_THREADS=#
for # number of processors but the simulation always started with 1 processor.
I assume that openmp is included in the standard makefiles (checked and there was an -fopenmp flag). Do the number of threads need to be set at build time?


Regards,

João.
AA
Anonymous Anonymous, modified 7 Years ago.

RE: Running DELWAQ with OpenMP (Answer)

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts
Hi João,

The number of threads can be set in block 7 of the input file through the special constant nothreads. Like this:

CONSTANTS nothreads DATA 0.0


Default value is -1: no multiprocessing
You can either set it to 0 (max number of threads) or to the number of threads you want.

If you need more info, look in the Input File Description manual (section 7.3.1.1).

Regards,
Christophe
JL
João Lencart e Silva, modified 7 Years ago.

RE: Running DELWAQ with OpenMP

Padawan Posts: 71 Join Date: 3/30/11 Recent Posts
Thanks,

João.