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intro story DELWAQ


DELWAQ is the engine of the D-Water Quality and D-Ecology programmes of the Delft3D suite. It is based on a rich library from which relevant substances and processes can be selected to quickly put water and sediment quality models together.

The processes library covers many aspects of water quality and ecology, from basic tracers, dissolved oxygen, nutrients, organic matter, inorganic suspended matter, heavy metals, bacteria and organic micro-pollutants, to complex algae and macrophyte dynamics. High performance solvers enable the simulation of long periods, often required to capture the full cycles of the processes being modelled.

The finite volume approach underlying DELWAQ allows it to be coupled to both the structured grid hydrodynamics of the current Delft3D-FLOW engine and the upcoming D-Flow Flexible Mesh engine (1D-2D-3D) of the Delft3D Flexible Mesh Suite (or even other models such as TELEMAC).

'DELWAQ in open source' is our invitation to all leading experts to collaborate in further development and research in the field of water quality, ecology and morphology using Delft3D. Feel free to post your DELWAQ related questions or comments in this dedicated forum space. If you are new to DELWAQ, the tutorial (in the user manual) is a good place to start. A list of DELWAQ related publications is available here.




Sub groups
D-Flow Flexible Mesh

Cohesive sediments & muddy systems


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Workload of CPU with one and multiple processors

Diogo Mees Delfes Varela, modified 6 Months ago.

Workload of CPU with one and multiple processors

Youngling Posts: 1 Join Date: 9/12/19 Recent Posts
Dear all,
I am working with the reduction of input resolution for temperature (possible further inclusion of sediment) simulations [M N K = 160 55 10] and therefore the "performance timers" of the simulations are a very important parameter. Also, as I need to run several simulations, running them at the same time would improve my work.
In this regard, I would like to clarify some doubts that I have as computer sciences are not my area and I want to be sure that I am comparing in the correct way the "performance timers".
a) If I run more than one simulation at the same time without parallel computing, does Delft3D uses one processor for each simulation?
b) is this processor used exclusively for the simulation?

2) If I use parallel computing are the processors used exclusively for the simulation?
For this question I noticed that when I set 2 processors for a simulation, two of them work around 100% but the others also have an increase in workload.

I am using a 6 core processors PC so my idea was using 2 processors for simulation (running two simulations at the same time) and having another two for daily working (light programming). Of course, only if the processors were used exclusively for each simulation, I would be able to compare their timers, as the workload of one simulation would not influence the "performance timer" of another simulation.

I attach my batch file for the parallel computing in case is useful.

Thank you,