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

Order of boundary specification

RS
Rudy Schueder, modified 5 Years ago.

Order of boundary specification

Padawan Posts: 52 Join Date: 10/8/13 Recent Posts
Hi all,

To me it seems that it is impossible to specify both a time-series discharge-per-cell open boundary and a Q-H open boundary, because a Q-H boundary must be specified before a time series boundary, but a 3-d boundary must be specified before all other boundaries.

Is there no work around to this issue? I would like my influent discharge to be specified per layer because there is no discharge in the bottom 4/5 layers of the influent boundary.

Thank you,

Rudy
Adri Mourits, modified 5 Years ago.

RE: Order of boundary specification

Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Rudy,

Can you give some more information? What exactly do you want?

Regards,

Adri
RS
Rudy Schueder, modified 5 Years ago.

RE: Order of boundary specification

Padawan Posts: 52 Join Date: 10/8/13 Recent Posts
Hi Adri,

Thanks for the reply. Here is what I would like:

- 5 layer 3D model

- discharge per cell influent boundary. at grid cell M,N layer 3 will have a non-zero discharge while layers 1,2,4 and 5 will have zero discharge. This is attempting to represent a pipe (I have a relatively fine mesh).

- a Q-H effluent boundary. This is attempting to represent a weir through which water exits the system.

Thank you!

Rudy
Adri Mourits, modified 5 Years ago.

RE: Order of boundary specification (Answer)

Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Rudy,

I expect this will be easier to model as a closed boundary with a discharge in the relevant cell in layer 3.

Regards,

Adri
RS
Rudy Schueder, modified 5 Years ago.

RE: Order of boundary specification

Padawan Posts: 52 Join Date: 10/8/13 Recent Posts
Hi Adri,

Thank you, I will do that instead and specify the discharge as a momentum discharge.

Cheers,

Rudy