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

Vertical grid in the Z-model

LT
Luciana Tessarolo, modified 7 Years ago.

Vertical grid in the Z-model

Youngling Posts: 15 Join Date: 5/9/13 Recent Posts
Dears,

I have a doubt about how to insert the layer thickness in the Z-model. I read the DEFLT3D-FLOW manual and I didn't understand the example - input parameters (p. 581).

To test this example, I selected 5 layers and some random percentages in the window Datagroup Domain, subgroup Grid parameters. Then, I added the keywords Zmodel, Zbot and Ztop in the Datagroup Additional parameters and also the keyword Thick (this with values equal to the example). When I saw my results, I noticed my thick distribution was equal to the one in the subgroup Grid parameters.

I would like to understand what the purpose to add the Keyword Thick in the Datagroup Additional parameters.

Can you please help me?

Thank you very much!

Regards,
Luciana
Adri Mourits, modified 7 Years ago.

RE: Vertical grid in the Z-model

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

Don't add the keyword "Thick" to the "Additional parameters"!

When specifying the "Layer Thickness" in the "Domain" -> "Grid parameters" in the GUI, these values will be added automatically to the mdf-file using the preserved keyword "Thick". If you add "Thick" also via "Additional parameters", you will mess up the mdf-file with twice this keyword.

The example in the manual section B 11.1 "Grid definition and construction" must be interpreted as:
The parameter values that have been specified in the GUI are:
At "Domain" -> "Grid parameters"-> "Layer Thickness":
12.0
24.0
36.0
29.0
19.0
At "Additional Parameters":
Keyword: Zmodel Value: #Y#
Keyword: Zbot Value: -4.0
Keyword: Ztop Value: 1.0

This is also explained in section B.11.2 "Defining the keywords in the FLOW-GUI".

Regards,

Adri
LT
Luciana Tessarolo, modified 7 Years ago.

RE: Vertical grid in the Z-model

Youngling Posts: 15 Join Date: 5/9/13 Recent Posts
Hi Adri,

I thought I should insert twice the keyword Thick because, in this example, the sum of the layer thickness is greater than 100%. When I tried to run with these values in the "Grid parameters", it didn't work and this error appeared: *** ERROR Sum of layer thickness must equal 100 %.

Could you, please, tell me if it is possible to run any example with the layer thickness greater than 100%?

Thank you very much!

Regards,
Luciana
Adri Mourits, modified 7 Years ago.

RE: Vertical grid in the Z-model (Answer)

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

No, that is not possible. Thickness must always sum up to 100%. The numbers used as an example in the manual are wrong. I changed that (revision 28894).

Thanks for reporting this.

Regards,

Adri
LT
Luciana Tessarolo, modified 7 Years ago.

RE: Vertical grid in the Z-model

Youngling Posts: 15 Join Date: 5/9/13 Recent Posts
Hi Adri,

Thank you very much for all your help.

Regards,
Luciana