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

a problem about time and space varying wave boundary conditions

XL
Xiujuan Liu, modified 4 Years ago.

a problem about time and space varying wave boundary conditions

Youngling Posts: 13 Join Date: 10/15/13 Recent Posts
Hi all,

I want to have time-varying and space-varying wave boundary conditions using BCW files, but in example 1 and 2 in this section of delft3d-wave-manual the boundary west and boundary south are all line and they are vertical or horizontal.

In my model, one boundary is a curve and another is a line that is neither vertical nor horizontal. Under this case, how to deal with them?

Best regards, Xiujuan
Qinghua Ye, modified 4 Years ago.

RE: a problem about time and space varying wave boundary conditions (Answer)

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

You probably mean what if the boundary is not on one line and not perpendicular to each other but in a curve. Yes, the wave boundary is imposed as a driving force along the boundary, but not at exact grid cell or cells.

So a brief solution I would suggest is: draw a straight line outside your curved boundary and specify this coordinate in the BCW file.

I don't know if this answered your question,

Regards,

Qinghua
XL
Xiujuan Liu, modified 4 Years ago.

RE: a problem about time and space varying wave boundary conditions

Youngling Posts: 13 Join Date: 10/15/13 Recent Posts
Hi Qinghua,

Thank you so much for your suggestion. This answered my question and It appears to be a simple and effective way to set up a curved boundary. But I have a further question: do I need to extend the computation domain to the straight line after I draw it and specify its coordinate in the BCW file?

Best, Xiujuan
Qinghua Ye, modified 4 Years ago.

RE: a problem about time and space varying wave boundary conditions

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
hi Xiujuan,

I am not very sure, but I don't think so. but you may try and give me a feedback.

Regards,

Qinghua
XL
Xiujuan Liu, modified 4 Years ago.

RE: a problem about time and space varying wave boundary conditions

Youngling Posts: 13 Join Date: 10/15/13 Recent Posts
Hi Qinghua,

Okay, I will try and give you a feedback.

Thank you very much.

Regards, Xiujuan