intro story Lake


Lakes and reservoirs are important resources for communities around the globe. They provide food, drinking and irrigation water and can also offer spots for recreation. Under certain conditions lakes can also represent a threat for local communities, such as flooding or limnic eruptions. The ecological state of shallow lakes may be hampered by suspended sediments due to wind driven currents and waves. In deep lakes, stratification can cause undesirable anoxic conditions in the deeper areas. Understanding these systems is crucial to enable a sound management of these water bodies.

Delft3D is the state-of-the-art modelling framework for hydrodynamics, water quality, ecology, waves and morphology.
Here, in this space, we share knowledge & experiences, and discuss issues related to modelling of lakes.






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


Message Boards

Using ddcouple

Alex Christensen, modified 5 Years ago.

Using ddcouple

Youngling Posts: 7 Join Date: 12/19/13 Recent Posts

I am trying to use the com output files from my FLOW simulation in DelWAQ. For each type of file (.are, .cco, etc), I have 10 parts (com-*-001.are, com-*-002.are, etc). I am not sure how to use ddcouple to put all 10 parts together. Can someone please explain this.

Thank you
Michel Jeuken, modified 5 Years ago.

RE: Using ddcouple

Jedi Knight Posts: 154 Join Date: 1/21/13 Recent Posts
Hi Alex,

During the flow run a ddb-file was created. This should contain the definition of the ten domains. Be aware that this file is not always properly overwritten when you change the number of domains. It should contain number of domains minus one rows, mentioning all 10 of them. These are the 'adhesive edges' of the domains. ddcouple was developed for 'real' domain decompostion, but can also manage this parallel domain decomposition, but you have to tell the program.

This can be don running it from the prompt using:

ddcouple <name>.ddb -parallel

Or just run ddcouple, give the name of the ddb-file, and say yes to the next question (Has this ddb-file been created by a MPI-based parallel Delft3D FLOW run (y/n)?). I'm not sure if your setup already contains the latest version of ddcouple that asks this question. If not, you can download it here. The older version could only accept the -parallel switch from the prompt.

Gholamreza Shiravani, modified 2 Years ago.

RE: Using ddcouple

Padawan Posts: 65 Join Date: 6/25/16 Recent Posts

Hi Michel,

I tried ddcouple after generating com- files with Delwaq Option fron Delft-FLOW, but I got the attached error. Could you tell me the solution? How can I use ddcouple? Should I link it to my LD_LIBRARY_PATH?

Chao Li, modified 1 Year ago.

RE: Using ddcouple

Youngling Posts: 5 Join Date: 6/16/19 Recent Posts
<p>Hi Michel,</p>

<p>When I type y to the question (Has this ddb-file been created by a MPI-based parallel Delft3D FLOW run), the cmd prompt just flashed and vanished. Does that mean there is problem or do I have to proceed to choose one input and start the coupling again? Kind of puzzled how to merge the several .com files for PART simulation. Thanks a lot</p>
Hunter An, modified 6 Months ago.

RE: Using ddcouple

Youngling Posts: 1 Join Date: 9/20/20 Recent Posts
This information helps me a lot to understand how to use DDcouple. Can you please also explain hoe to use decals for D ecology programs because I had an issue while using this program for my project. The best dissertation proofreaders helps you to get rid of academic work. You can check this for more info.
Max Joy, modified 1 Month ago.

RE: Using ddcouple

Youngling Posts: 1 Join Date: 2/20/21 Recent Posts
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