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

Bottom roughness coefficients file

KA
Khalid Al-Asadi, modified 8 Years ago.

Bottom roughness coefficients file

Youngling Posts: 16 Join Date: 5/5/11 Recent Posts
Hello,

Is there a way to generate the bottom roughness coefficients file (*.rgh) automatically ? My domain is too big and it is difficult to do that manually.

Thanks

Khalid
LB
Lawrence Patrick Bernardo, modified 8 Years ago.

RE: Bottom roughness coefficients file

Youngling Posts: 10 Join Date: 8/2/11 Recent Posts
Hi Khalid,

I think you can do this using the quickin module. If you already have a grid for your domain, then you can use quickin to set up your *.rgh file. You can use the different tools within quickin to assign the values you want for different parts of the grid, and then generate the roughness file as a depth file. It will already be in the proper format corresponding to your defined grid. Just note that you might need to paste join two depth files into one, since roughness usually needs both U and V input. If the values are the same, you can just copy the contents and paste it under the last line. You can then save the resulting file to use as your roughness input file by renaming it with the *.rgh extension.

Cheers,
Lawrence
KA
Khalid Al-Asadi, modified 8 Years ago.

RE: Bottom roughness coefficients file

Youngling Posts: 16 Join Date: 5/5/11 Recent Posts
Dear Lawrence,

Thank you for your help. Could you please inform me about the tools in the Quickin module which can help to generate *.rgh file ? and how can I assign the roughness valuse for different parts of the grid ?

Thanks,
Khalid
LB
Lawrence Patrick Bernardo, modified 8 Years ago.

RE: Bottom roughness coefficients file

Youngling Posts: 10 Join Date: 8/2/11 Recent Posts
Hi Khalid,

Others may suggest faster ways to do this in quickin, but off the top of my head, first you can explore the "combine depth and uniform value" options in the menu. Maybe you can start with filling the whole grid with a constant value, then use the polygon edit feature to remove the values for parts of the grid you want to change, then fill the missing depths again with the values you want.

An alternative way may be to come up with an ascii file in x y z format (lat lon roughness_parameter), then use triangular interpolation to fill your grid with values. You may also want to apply some smoothing after, both for this method and the first method I suggested. Then when you're content with the values, you can save as depth file then edit it a bit to create your roughness file.

Hope this helps.

Cheers,
Lawrence
KA
Khalid Al-Asadi, modified 8 Years ago.

RE: Bottom roughness coefficients file

Youngling Posts: 16 Join Date: 5/5/11 Recent Posts
Dear Lawrence,

Thanks alot for your benificial instructions.

Khalid
MA
Md Bin Siddique, modified 6 Years ago.

RE: Bottom roughness coefficients file

Padawan Posts: 42 Join Date: 12/17/12 Recent Posts
I want to make a rughness file for my grid. But i am confusred what is the procedure. automatic or manual. in Flow manual there show this message




65.0 65.0 65.0 65.0 65.0 65.0 65.0 65.0 fstart U-roughness coe cientg
65.0 65.0 65.0
65.0 65.0 65.0 65.0 65.0 65.0 65.0 65.0
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60.0 60.0 60.0 60.0 60.0 60.0 60.0 60.0
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55.0 55.0 55.0 55.0 55.0 55.0 55.0 55.0
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55.0 55.0 55.0 55.0 55.0 55.0 55.0 55.0
55.0 55.0 55.0
55.0 55.0 55.0 55.0 55.0 55.0 55.0 55.0
55.0 55.0 55.0
60.0 60.0 60.0 60.0 60.0 60.0 60.0 60.0 fstart V-roughness coe cient)
60.0 60.0 60.0
60.0 60.0 60.0 60.0 60.0 60.0 60.0 60.0
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65.0 65.0 65.0 65.0 65.0 65.0 65.0 65.0
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Adri Mourits, modified 6 Years ago.

RE: Bottom roughness coefficients file

Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Md Bin Siddique,

The easiest way is using Quickin. A Delft3D setup also contains a manual for Quickin.

Regards,

Adri