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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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Parallel run stuck on "Part IV - Reading complete MD-file..." [NO ONLINE]

Andrea Cimatoribus, modified 3 Years ago.

Parallel run stuck on "Part IV - Reading complete MD-file..." [NO ONLINE]

Youngling Posts: 4 Join Date: 3/8/16 Recent Posts
Dear all,

I am having a a weired problem, I've seen a previous report of the same in the forum, but no solution.
Basically, I have a set-up, which runs fine on a single CPU (code version 6118).
Exactly the same setup gets stuck when run in parallel, the number of CPU's doesn't matter.
The last output line is "Part IV - Reading complete MD-file..."
The weird thing is that I do not get any error message whatsoever (nothing in the stdout, nothing in the diag files), so I do not know how to debug the issue.

I have this problem only with executables compiled with intel 2016, no problem if I use a gnu-generated executable.

Further hints:
- I had some similar issue running on a cluster (with intel compiler), and there it was solved by adding "export PMI_RANK=0" in the run script. However, this doesn't help on my workstation.
- If I launch the simulation in background (linux command line), the job stops when it reaches the point where it gets stuck.

I should specify: Online visualisation is switched off, so this is not the issue reported in the FAQ!

Any mpi-expert out there able to help?

ADDENDUM: running the model with mpirun but on cpu, works fine. So the issue is really only when running on multiple CPU's, not more generally related to mpi.