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


Message Boards

Periodic Boundary Conditions

Francesco Enrile, modified 5 Years ago.

Periodic Boundary Conditions

Padawan Posts: 26 Join Date: 3/25/12 Recent Posts
Dear all,

is it possible to implement periodic boundary conditions in Delft3D?

Thank you very much for any help,
sven Fachinger, modified 2 Years ago.

RE: Periodic Boundary Conditions

Youngling Posts: 5 Join Date: 3/8/18 Recent Posts

Hello, do you have a solution for periodic boundary conditions? I want to simulate a wave-flume experiment with regular waves.





Bert Jagers, modified 2 Years ago.

RE: Periodic Boundary Conditions

Jedi Knight Posts: 201 Join Date: 12/22/10 Recent Posts

Dear Francesco,


The main/trunk version of Delft3D-FLOW doesn't allow you to impose periodic boundary conditions, but we experimented a bit with such boundaries in a development branch to model a circular flume. However, you refer to a wave-flume, so you may be interested in periodic boundaries in a coupled flow-wave simulation. We didn't do any work on periodic boundaries in Delft3D-WAVE or SWAN.

Can you describe the envisioned model setup in more detail, and indicate where and how you would like to use the periodic boundaries?


Best regards,


Rachel Allen, modified 1 Year ago.

RE: Periodic Boundary Conditions

Youngling Posts: 2 Join Date: 10/27/18 Recent Posts

Hi Bert,

I'm also interested in periodic boundaries in Delft3D-FLOW and WAVE/ SWAN.  I'm interested in running a very simple idealized case with currents and waves over a flat or gently sloping bed, and exploring the role of sediment parameterizations for suspended flocs.  I am working on this in a realistic 3D model, but I'd also like to explore a more simple case to try out the parameter choices.  I imagine using periodic boundaries to allow sediment concentrations to reach equilibrium given the flow forcing.  Is there any more information on the current state of periodic boundaries in FLOW and WAVE?  Is there still a development branch of code that could do this?

Thank you!