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! 

 

=======================================================
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.

=======================================================

** PLEASE TAG YOUR POST! **

 

 

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

 


Message Boards

Grid orientation problem (D3D-FLOW)

YK
Yahia Kala, modified 1 Year ago.

Grid orientation problem (D3D-FLOW)

Youngling Posts: 12 Join Date: 7/11/13 Recent Posts

Hi All, I have a grid that I have converted from a structured finite element model. The grid covers a river and a floodplain. The gridlines meander quite a bit but are pretty smooth but have some areas with bad orthogonality. The node numbering is proving to be quite problematic when I try to run the model.

 

I get the following error:

 

*** ERROR Grid orientation incorrect: Delft3D requires (M,N) to form a counter-clockwise coordinate system.

 

I noticed that this check was a recently added feature in this release notes page:

https://oss.deltares.nl/web/delft3d/release-notes

 

I can't really get around this issue by rotating the grid administration. My geometry and gridlines are such that the numbering can never be counter-clockwise in every part of the domain.

 

Why is this constraint in the model and what can I do about it?

 

YK
Yahia Kala, modified 1 Year ago.

RE: Grid orientation problem (D3D-FLOW)

Youngling Posts: 12 Join Date: 7/11/13 Recent Posts

I solved my own issue: I simply reversed the row coordinate arrays I was using to generate the grid. Now the numbering is 'counter-clockwise', as in, when you move along increasing m-values, the n-values are increasing to the left.