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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

 


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Simulation results are not smooth / double peaks

AR
Anas Rahman, modified 6 Years ago.

Simulation results are not smooth / double peaks

Youngling Posts: 21 Join Date: 10/4/13 Recent Posts
Hi everyone,

I am using domain decomposition for my models, with a combination of Water Level and current for my boundaries. I am currently trying to calibrate my model with measured data. However, results from my simulation are not smooth /jagged and showing double peaks.It is in my understanding that models should give a smooth graph, while measured data supposedly be uneven/not smooth due to interference ect

I am running a 3D model, and interested in the horizontal velocities (U and V components). I would like to highlight that my results matched quite well with the measured data in term of the phases, and also the velocities value. The only things that is bothering me is the uneven graph that my models produced.

A sample of my result is attached together with this post.

Any help in this matter is greatly appreciated!
Fernando Barreto, modified 5 Years ago.

RE: Simulation results are not smooth / double peaks (Answer)

Padawan Posts: 74 Join Date: 6/21/12 Recent Posts
Hi, What type of boundary condition are you working with? Velocity and water levels in different boundaries (for instance in the north velocity, and in east current) or Riemann bc?
If it's the first type, are you using Riemann coefficients to absorb the outgoing waves?

Regards,
Fernando
EE
Esther Espinoza, modified 2 Years ago.

RE: Simulation results are not smooth / double peaks

Padawan Posts: 25 Join Date: 4/6/17 Recent Posts
Fernando Barreto:
Hi, What type of boundary condition are you working with? Velocity and water levels in different boundaries (for instance in the north velocity, and in east current) or Riemann bc?
If it's the first type, are you using Riemann coefficients to absorb the outgoing waves?

Regards,
Fernando


Hi, I'm having the same problem with my water level results. Do you know what it might be? I don't know how to solve it. I'm using water level with time series for one open boundary in an estuary. I changed my manning coefficient between 0.012 and 0.030 and the eddy viscosity between 10 and 100. For the reflection parameter alpha I used 0 and 100 but with all the above I still have the same problem. I'm not sure what I'm doing wrong. I'm not considering other parameters just water level.

Thanks!
Adri Mourits, modified 2 Years ago.

RE: Simulation results are not smooth / double peaks (Answer)

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

Does it help if you reduce the timestep with a factor 10?

Regards,

Adri