Dear Sevinj,
maybe I start with a short history about the 2D shallow water model. A few
years ago, I developed a fully implicit 2D shallow water equations (SWEs)
finite volume scheme at BAW. Later we (I and some colleagues from BAW)
implemented the scheme together with the DuMux developers in DuMux.
As Timo said, DuMux is very flexible and it is possible to customize the
implemented model to your needs.
The actual model in DuMux uses a fully implicit method to solve the SWEs. DuMux
allows to change the temporal discretication, but you may have to implement
some implicit method for the friction term if you aply an explicit
discretization.
At BAW we run mainly simulations of rivers (German inland waterways), flume
experiments and academic test cases on unstructured triangular grids. The
excellent MPI parallelization of DuMux and DUNE allows to run simulations on a
HPC with thousands of cores. We use typically about 1000 elments per MPI rank
and meshes with 0.1 - 7 million elements. We work with a small DuMux module
which provides a customized application for the simulation. This allows us to
use one application for all simulations we run. As file format for the mesh and
the results we use XDMF/HDF5. For mesh generation we use JANET and python
scripts. All boundary conditions are defined by simple text files.
The SWEs in DuMux apply the hydrostatic reconstruction after Audusse et al.. We
currently implemented for an test the method after Chen and Noelle to simulate
surface runoff on hillslopes. This might be a better choice for flood
modelling.
The scheme in DuMux is really stable and allows to simulate also dam breaks
(e.g. Malpasset). However, if the underlying physics is on a small time scale,
the time step size is limited to the physics and an explicit model might be a
better choice.
Some furter information:
- BAW works currently on the development of a sediment transport model in
DuMux.
- There exists no 1D shallow water model based on cross-sections for DuMux.
- We use paraview and python scripts for visualisation and Janet for mesh
generation
- At BAW we do not use any linked software. All simulations run on Linux
computer (HPC)
Best regards,
Leo
> [email protected] hat am 21.04.2022 10:35 geschrieben:
>
>
> Dear Timo,
>
> thank you very much for the useful answers.
>
>
> I want to clear my first question, please: Dumux has any linked software
> interms of grid construction, visualisation, or pre/post-processing.
> Like Hydro_AS2D has MapView to visualise its results.
>
>
> Thank you in advance,
> Sevinj
>
>
> On 2022-04-21 10:16, Timo Koch wrote:
> > Dear Sevinj,
> >
> > please always reply to the mailing list so that others can profit from
> > the answers too.
> >
> >> On 21. Apr 2022, at 08:36, [email protected]
> >> wrote:
> >>
> >>
> >> Dear Timo,
> >>
> >> thank you very much. Your email and the links are very helpful. Yes, I
> >> needed exactly 2D shallow water model. I have last feew questions
> >> left. If you answer, I would be happy.
> >>
> >>
> >> 1. Is there any linked software with Dumux, (can be internal or
> >> external)?
> >
> > I don’t understand.
> >
> >> 2. Is there any 1D/2D coupled model?
> >
> > Not out-of-the-box. But this is possible in Dumux as model coupling is
> > an integral part in the design. Currently, there is no 1D shallow
> > water model. So this would have to be added.
> > I happen to be personally interested in the 1D-2D coupled model but I
> > can’t promise anything is going to be usable in the near future.
> >
> > At this point consider this important advice:
> >
> > Dumux often doesn’t provide an out-of-the-box solution to your
> > problem. This means you need to modify and add stuff according to your
> > needs.
> > Dumux is written (like Dune on which Dumux is based) using modern
> > heavily templated C++. This means you should be familiar with C++ or
> > at least willing to invest quite some time learning C++.
> > There is admittedly a bit of a steep learning curve.
> >
> >> 3. IS there Water Quality and Sedimentation models?
> >
> > not that I know of.
> >
> >> 4. I know that Dumux use implicit FD Method,
> >
> > that’s not correct. The 2D shallow-water model uses a cell-centered
> > finite volume scheme (with Riemann solver for the numerical flux) for
> > the spatial discretisation.
> > The time discretisation can be explicit or implicit Euler, whatever
> > you choose, however you have to implement a CFL criterion for the time
> > step restriction yourself.
> > Higher order time discretization are in the making, but not available
> > in the current version and would require quite some effort to
> > implement.
> >
> >> but I did not find any info about Mesh Type, if it is structured or
> >> unstructured.
> >
> > Both structured and unstructured meshes are supported.
> >
> > Also local adaptivity is possible, but again there is no
> > out-of-the-box solution for 2D shallow water.
> > You would need to implement a conservative mapping from one grid to
> > the other to transfer the solution and parameters yourself (there are
> > some helper and examples).
> >
> > Best
> > Timo
> >
> >>
> >>
> >> I found broad info about State and Private Organisations which have
> >> used/are using DUMUX as research purposes. Also about User Meetings,
> >> which is wonderful.
> >>
> >>
> >> Liebe Grüße,
> >> Sevinj
> >>
> >>
> >>
> >>
> >>
> >>
> >> On 2022-04-20 21:22, Timo Koch wrote:
> >>> Dear Sevinj,
> >>> welcome to the Dumux mailing list and happy to hear that you are
> >>> considering Dumux.
> >>> I’ll try to answer but it would be easier with more detail what you
> >>> are trying to achieve.
> >>> 1. Parallelization is possible for many models, both distributed
> >>> memory parallelism with MPI and shared memory parallelism (several
> >>> backends and for the assembly in the newest version)
> >>> 2. We don’t provide any special helpers for cloud computing but you
> >>> can of course run it in the cloud. The dependencies are very minimal
> >>> so it should be easy to install.
> >>> 3. You would have to be more specific what kind of mathematical model
> >>> you are looking for. You can find an overview of available models
> >>> here: https://dumux.org/docs/doxygen/master/modules.html.
> >>> For instance a 2D shallow water model is available and there is an
> >>> example here
> >>> (https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/tree/master/examples/shallowwaterfriction).
> >>> The SWE model has been successfully tested on HPC clusters.
> >>> The code is highly customisable build with the intention that almost
> >>> every piece can be swapped out for a custom implementation.
> >>> Best wishes
> >>> Timo
> >>>> On 20. Apr 2022, at 14:57, [email protected]
> >>>> wrote:
> >>>> Dear DumuxDune staff,
> >>>> I am a student at TU Darmstadt and I am doing research on 2D
> >>>> software. In my list I added DumuxDune as well.
> >>>> I would be happy if you clear some questions for me.
> >>>> 1. Parallelization in Dumux Dune( in the handdbook there is a bit
> >>>> info but unclear).
> >>>> 2. Cloud Computing in DumuxDune.
> >>>> 3. If it will be used in flood modelling.
> >>>> Thank you in advance,
> >>>> Sincerely,
> >>>> Sevinj
> >>>> _______________________________________________
> >>>> DuMux mailing list
> >>>> [email protected]
> >>>> https://listserv.uni-stuttgart.de/mailman/listinfo/dumux
> >>
>
> _______________________________________________
> DuMux mailing list
> [email protected]
> https://listserv.uni-stuttgart.de/mailman/listinfo/dumux
Im Auftrag
Dr.-Ing. Leopold Stadler
--
Referat Numerische Verfahren im Wasserbau
Abteilung Wasserbau im Binnenbereich
Bundesanstalt für Wasserbau
Federal Waterways Engineering and Research Institute
Kußmaulstraße 17 | 76187 Karlsruhe
Tel.: +49 721 9726-3525
Fax: +49 721 9726-4540
https://www.baw.de
_______________________________________________
DuMux mailing list
[email protected]
https://listserv.uni-stuttgart.de/mailman/listinfo/dumux
