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

Domain decomposition and Z-model

SA
Steven Ayres, modified 8 Years ago.

Domain decomposition and Z-model

Padawan Posts: 33 Join Date: 4/21/11 Recent Posts
The Delft3D-FLOW manual states that the Z-model does not work with domain decomposition (page 611 of the 14 April, 2011 version). We have a very stratified, large scale estuary system we are analyzing with Delft3D where both the Z-model and domain decomposition would be desirable features. Are there plans to make the domain decomposition feature functional with the Z-model?
Adri Mourits, modified 8 Years ago.

RE: Domain decomposition and Z-model

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

Officially, the Z-model functionality is still "beta"-functionality.

There are some testcases in our testbed based on Z-model and DomainDecomposition and the results in there look good.

A set of Z-model updates is being prepared in a branch and will hopefully be merged into the trunk soon.

Regards,

Adri
SA
Steven Ayres, modified 8 Years ago.

RE: Domain decomposition and Z-model

Padawan Posts: 33 Join Date: 4/21/11 Recent Posts
Thanks Adri,

I have tested the sigma version on my problem and it has proven to be incapable of resolving the stratification in the weakly forced system I am investigating because of the artificial diffusion introduced by the boundary fitted cell volumes. I have also tested the Z-model on part of the domain and had much more success at creating a stratified system. However, I would like to investigate sedimentation processes and retain the domain decomposition setup I have created for the sigma model. I was wondering if there is a beta version of the Z-model with domain decomposition and sedimentation that could be released to the community for testing?

Steve
Adri Mourits, modified 8 Years ago.

RE: Domain decomposition and Z-model (Answer)

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

Have a look at Bert's answer in this thread.

Regards,

Adri
Fernando Barreto, modified 7 Years ago.

RE: Domain decomposition and Z-model

Padawan Posts: 74 Join Date: 6/21/12 Recent Posts
Was the Z-model implemented in the DD boundary?
Adri Mourits, modified 7 Years ago.

RE: Domain decomposition and Z-model (Answer)

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

The combination DomainDecomposition and Z-model works. But be aware that that combination is sensitive for bed level gradients on the DD boundary in both directions (along and perpendicular to the DD boundary).

Regards,

Adri