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intro story DELWAQ

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.

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Sub groups
D-Flow Flexible Mesh
DELWAQ

Cohesive sediments & muddy systems

 


Message Boards

Z model restart in parallel

SA
Steven Ayres, modified 5 Years ago.

Z model restart in parallel

Padawan Posts: 33 Join Date: 4/21/11 Recent Posts
I am running a simulation using the Z model in parallel with mud and salinity. I know the Z model support for morphology and parallel are rather new but I was wondering if using a map file to restart a Z model simulation in parallel with morphology was supported yet? When I try to restart using a map file, the model immediately diverges and crashes after the 2nd time step.

Thanks,
Steve
Adri Mourits, modified 5 Years ago.

RE: Z model restart in parallel

Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Steven,

Restarting from a map-file for a parallel run should work. It should not matter whether it is a sigma-model or a Z-model. So this seems to be a bug. Can you zip your full set of input files (ideally on a model as small as possible that still shows the problem) and attach it to a post here (or mail it)?

Thanks.

Be careful with the combination Z-model and sediment transport; that's still in the research state.

Regards,

Adri
SA
Steven Ayres, modified 5 Years ago.

RE: Z model restart in parallel

Padawan Posts: 33 Join Date: 4/21/11 Recent Posts
Hi Adri,

I noticed that there is some node to node velocity oscillations in the offshore boundaries that are defined with water levels in my model, I am wondering if this may be part of the problem with warm starting the model? Therefore, I would like to convert the offshore boundaries to current or Riemann boundaries. I have access to a regional model that provides the offshore velocity as eastward and northward components for various depths (the AMSEAS model). If I understand the manual, I should use the normal velocity component to the grid. To achieve this, I determined the scalar projection of the two velocity components normal to the grid cell in the positive grid direction. Does this sound correct?

Thanks,
Steve
Adri Mourits, modified 5 Years ago.

RE: Z model restart in parallel

Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Steven,

It's difficult to detect what's going wrong with this limited information.

Your method to create current boundary conditions sounds good.

Regards,

Adri