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

Nesting

ZV
Zoe Vosberg, modified 8 Years ago.

Nesting

Youngling Posts: 10 Join Date: 6/11/12 Recent Posts
Hi,

I have some problems with the nesting function.

I have created an overall grid and a detailed grid (including enclosure files, boundaries and boundary conditions). But when I try to nest the detailed grid in the overall grid, the necessary monitoring stations at the boundary are not generated. I tried this with the DelftDashboard (*.obs-file not generated at all) as well as directly in Delft 3D (*.obs-file generated but empty), following the instructions in the manuals.

Any ideas what could have gone wrong?
Qinghua Ye, modified 8 Years ago.

RE: Nesting

Jedi Council Member Posts: 610 Join Date: 3/2/11 Recent Posts
Hi Zoe,

Given the information you provide, I cannot judge the problem.

Did you try to plot these two grid together in RGFGRID? Are they using the same coordination system? If both answers are yes, you may have to send me your grid files.

Regards,

Qinghua
ZV
Zoe Vosberg, modified 8 Years ago.

RE: Nesting

Youngling Posts: 10 Join Date: 6/11/12 Recent Posts
Hi Qinghua,

thanks for you answer!

Yes, both of the grids use the same coordinate system (WGS 84). Do you by "plot these two grid together in RGFGRID" mean if I just imported both of them in RGFGRID to have a look at them? Yes, I did that. Or do you mean that I have to do something else with them in RGFGRID before trying to nest them?

In any case I attached them - so if you find time to have a look at it, I would be very thankful!

Best wishes,
Zoe
Mladen Radovanovic, modified 8 Years ago.

RE: Nesting

Youngling Posts: 10 Join Date: 6/10/12 Recent Posts
Dear Zoe,

For me it seems that fine grid is too small in relation to the coarse grid. Only two points from coarse grid are included in fine. I would suggest you to try with one more grid (medium) in area of interest.

Anyhow, since I do not have much experience with Delft3D I am not sure this will solve the problem. However, you should try.

Regards,

Mladen
ZV
Zoe Vosberg, modified 8 Years ago.

RE: Nesting

Youngling Posts: 10 Join Date: 6/11/12 Recent Posts
Hello Mladen,

thanks for the suggestion! It makes sense what you are saying about the fine grid being too small. I tried with a coarser one though (see attachment), but the problem remains.

Regards, Zoe
Mladen Radovanovic, modified 8 Years ago.

RE: Nesting

Youngling Posts: 10 Join Date: 6/10/12 Recent Posts
Dear Zoe,

Please try with the attached grid. I am not sure that will help but you can try.

Regards,

Mladen
ZV
Zoe Vosberg, modified 8 Years ago.

RE: Nesting

Youngling Posts: 10 Join Date: 6/11/12 Recent Posts
Hi Mladen,

thank you so much for your effort! I just tried it with your grid but unfortunately it is still not working...

Best regards, Zoe
SV
Samuel Valentim, modified 2 Years ago.

RE: Nesting

Youngling Posts: 4 Join Date: 8/12/15 Recent Posts
Qinghua Ye:
Hi Zoe, Given the information you provide, I cannot judge the problem. Did you try to plot these two grid together in RGFGRID? Are they using the same coordination system? If both answers are yes, you may have to send me your grid files. Regards, Qinghua
Hi Mr. Qinghua Ye,

I know this post have so much time but I have same problem. If you can help me, I appreciate it.

I read the manual but I can't reproduce nesting with my grids (attached). If possible, Let  me know what I need do to work.

Since then,

Thank you.

Best,

Samuel

 

 

 

 

 

 

Fernando Barreto, modified 8 Years ago.

RE: Nesting

Padawan Posts: 74 Join Date: 6/21/12 Recent Posts
Hi Zoe, is you boundaries of inner grid (the more refined) time series stations ? If don't, change it, that It will probably work.
Qinghua Ye, modified 8 Years ago.

RE: Nesting (Answer)

Jedi Council Member Posts: 610 Join Date: 3/2/11 Recent Posts
Hi, Zoe,

It must be something wrong with your boundary definition file in the nested model.

I tried and everything goes all right. See the zip files.

Let us know if you still have further problem.

Attachments:

ZV
Zoe Vosberg, modified 8 Years ago.

RE: Nesting

Youngling Posts: 10 Join Date: 6/11/12 Recent Posts
Hi Fernando and Qinghua,

thanks a lot for your advice! You were right: the problem was my boundary definition file and now the nesting works well.

Best regards, Zoe