intro story D-Flow FM

 

D-Flow Flexible Mesh

D-Flow Flexible Mesh (D-Flow FM) is the new software engine for hydrodynamical simulations on unstructured grids in 1D-2D-3D. Together with the familiar curvilinear meshes from Delft3D 4, the unstructured grid can consist of triangles, pentagons (etc.) and 1D channel networks, all in one single mesh. It combines proven technology from the hydrodynamic engines of Delft3D 4 and SOBEK 2 and adds flexible administration, resulting in:

  • Easier 1D-2D-3D model coupling, intuitive setup of boundary conditions and meteorological forcings (amongst others).
  • More flexible 2D gridding in delta regions, river junctions, harbours, intertidal flats and more.
  • High performance by smart use of multicore architectures, and grid computing clusters.
An overview of the current developments can be found here.
 
The D-Flow FM - team would be delighted if you would participate in discussions on the generation of meshes, the specification of boundary conditions, the running of computations, and all kinds of other relevant topics. Feel free to share your smart questions and/or brilliant solutions! 

 

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We have launched a new website (still under construction so expect continuous improvements) and a new forum dedicated to Delft3D Flexible Mesh.

Please follow this link to the new forum: 
/web/delft3dfm/forum

Post your questions, issues, suggestions, difficulties related to our Delft3D Flexible Mesh Suite on the new forum.

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** PLEASE TAG YOUR POST! **

 

 

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

 


Message Boards

Time varying initial conditions

JW
Jeff Wilson, modified 5 Years ago.

Time varying initial conditions

Youngling Posts: 5 Join Date: 11/22/13 Recent Posts
Hello,

I was wondering if it is possible to input time-varying metaocean parameters into FLOW. I see the file format for input initial conditions (A.2.9), but was wondering if there is a way to put a time series component into the file analogous to time-varying wind files? Essentially I am trying to import a years worth of oceanographic data (u vel, v vel, temp, salinity, water level) from HYCOM into FLOW. Anyone else have luck doing this?

Thanks,

Jeff
Mihael Souza, modified 5 Years ago.

RE: Time varying initial conditions

Padawan Posts: 65 Join Date: 10/11/12 Recent Posts
Hi Jeff,

Regarding time-varying metaocean inputs, you can add them through your boundary condition definitions in the GUI, or you can manually edit/create the .bct and .bcc files.
The first one prescribes your water level / velocity profiles, while the second one is related to substances (temp, salinity, sediments, etc). You can search the manual for the extensions to see what the files are like or, if you have the GUI, just create one with it and see how it looks. Its pretty straightforward. Do keep in mind that you also need a boundary definitions file (.bnd) along with the other ones, which will give the location of your boundary.

I have no experience with HYCOM, and don't know how is the resulting output of the model. But if you can extract a time-series from a station in it, roughly about the same lat/long of your Delft3D open boundary, you could use the resulting series to force your model. There may be someone who already tried some sort of coupling between them, though.

Regards,

Mihael Souza
JW
Jeff Wilson, modified 5 Years ago.

RE: Time varying initial conditions

Youngling Posts: 5 Join Date: 11/22/13 Recent Posts
Thank you Mihael for pointing me in the right direction. Very helpful and very appreciated.

Thank you,

Jeff.
AM
Abdulla Mohamed, modified 5 Years ago.

RE: Time varying initial conditions

Youngling Posts: 16 Join Date: 6/12/13 Recent Posts
Hi Jeff and Mihael
I am relatively new to Delft3D and I am trying to do exactly what you had described in this post.
I have time series water levels and salinty information from anther model, which I am trying to put in as the initial conditions for a Delft3D model I am trying to setup.
If you had figured this out already and willing to share a sample .bct or .bcc file with me, I would highly apprecaite that.

Thanks very much for your time.

Cheers,
Abdulla
Emiel Moerman, modified 5 Years ago.

RE: Time varying initial conditions

Padawan Posts: 84 Join Date: 3/10/11 Recent Posts
Hi Abdulla,

An easy way is to use the GUI to create your own example *.bct and/or *.bcc file.
If within the GUI you have defined a boundary (*.bnd) and if this boundary is op the type timeseries, you can use the GUI to save a *.bct file.
It will be saved with default values; you can either change these within the GUI or manually adjusted it with a text editor.
Adjusting this file to your available input will give you your desired input file.
If also processes of temperature, salinity or sediment are switch on, you can follow the save procedure for your *.bcc file.

Good luck!

Emiel Moerman
AM
Abdulla Mohamed, modified 5 Years ago.

RE: Time varying initial conditions

Youngling Posts: 16 Join Date: 6/12/13 Recent Posts
Hello Emiel,

Thank you very much for the helpful hints. It is much appreciated.

Cheers,
Abdulla.