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

SWAN - boundary limits or memory constraints?

JM
Joao Morim do Nascimento, modified 7 Years ago.

SWAN - boundary limits or memory constraints?

Youngling Posts: 13 Join Date: 3/8/13 Recent Posts
Hello guys,

I have a problem when a run SWAN! I have defined several boundaries (~90) for my study domain in order to upload a TPAR file on each one of them with a 18km resolution (i.e. space between each TPAR file uploaded and space of each boundary).

However, when I ran the model it simply didnt not run and produce the following error:

severe error: all free units used

I wonder this is a problem with the memory of my computer (2.7 GHz i5, 8Gemoticon or I am surpassing any kind of limit that SWAN has for defining boundaries?

Thank you very much guys! I appreciate if someone can clarify me since I am not able to run the model until I figure it out!
Qinghua Ye, modified 7 Years ago.

RE: SWAN - boundary limits or memory constraints?

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Joao,

I would not expect this problem is a boundary limits or memory constraints of SWAN. 90 boundaries is not a big number.

By the way, are you running SWAN alone or Delft3D-WAVE alone?

Regards,

Qinghua
JM
Joao Morim do Nascimento, modified 7 Years ago.

RE: SWAN - boundary limits or memory constraints?

Youngling Posts: 13 Join Date: 3/8/13 Recent Posts
Hello,

I am running Delft3D-WAVE alone! I have problems with the spectral input...it is producing impossible results and I am following the structure referred on the manual. Can I send you the files for you to see what is wrong?

CHeers
Qinghua Ye, modified 7 Years ago.

RE: SWAN - boundary limits or memory constraints?

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Joao,

If you have the service and put your question to the support line (delft3d.support@deltares.nl), you may get faster response. Sorry for the delay caused by limitation of resouces.

Regards,

Qinghua YE
Marjorie Turiano, modified 3 Years ago.

RE: SWAN - boundary limits or memory constraints?

Youngling Posts: 19 Join Date: 1/22/16 Recent Posts
Hi,

I am experiencing the same severe error: all free units used. I found a helpful suggestion from the SWAN sourceforge forum to increase the highest file ref number in the SWANINIT file. However, after trying many times, I observed that the SWANINIT file is rewritten at every instance that Delft3D-WAVE is ran, so there is really no use editing the previous SWANINIT file. Btw, I commented the lines pertaining to the SWANINIT file in the bat file found in D3D_HOME\win32\swan\scripts to I could view the SWANINIT file...

Is there a way to work around this? I have prepared several TPAR files (106 to be exact) at the boundaries, so the "free units" are used up. Or is the only way to proceed is to reduce my boundary?


Sincerely,
Marjorie
Adri Mourits, modified 3 Years ago.

RE: SWAN - boundary limits or memory constraints?

Yoda Posts: 1221 Join Date: 1/3/11 Recent Posts
Hi Majorie,

The following lines describe a not so nice workaround:
Delft3D-WAVE prepairs the SWAN computation and then calls (on Windows) the script "swan.bat" that starts the SWAN computation. In this "swan.bat" script, before SWAN is started, you can add a Windows pause statement (to change SWAN input files manually) or call a self-written-script that performs the file modifications.

If you chooses this option, I can help you with preparing it.

Regards,

Adri
Marjorie Turiano, modified 3 Years ago.

RE: SWAN - boundary limits or memory constraints?

Youngling Posts: 19 Join Date: 1/22/16 Recent Posts
Hi Adri,

I think the workaround you suggested is a good idea. It can also solve my issues regarding other SWAN input here.

I think we can start with adding the pause statement in the swan.bat file to give time for me to manually edit the input files. How do you suggest to implement this?


Sincerely,
Marjorie