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

bathymetry file

SS
Soroush Safaei, modified 7 Years ago.

bathymetry file

Youngling Posts: 21 Join Date: 3/24/13 Recent Posts
Hello every one...
This is a little bit urgent....I am working on my thesis and I have encountered funny problems!!!
I built the grid file and depth in quicken but when I open it in my models it seems that depth data does not exist!!!
I can not see it or open in in visualization area!!!
and when I simulate the file that has been made only has -999 as the observation points!!!!
I don't know what is wrong with this!!!!
and another question is that I want to know if I can model the shore line variation in delft3D...
I thought it wasn't possible but now I ma not sure...
Thanks again for helping me.......
U
Arnold van Rooijen, modified 7 Years ago.

RE: bathymetry file

Hi Soroush,

Could you please upload your dep-, grd- and mdf-file? Then perhaps I can figure out what is wrong with your setup.

If I understand your other question right, I assume you want to know if you can do morphological (or bed level updating) simulations with Delft3D. The answer is yes, you can turn it on in the user interface under 'Processes'.

Cheers,
Arnold
SS
Soroush Safaei, modified 7 Years ago.

RE: bathymetry file

Youngling Posts: 21 Join Date: 3/24/13 Recent Posts
Hi Arnold
I attach the files that you wanted.... only for .mdf....cause I start first with the wave model.....
again thanks a lot for helping me with this....
and thanks for your time
SS
Soroush Safaei, modified 7 Years ago.

RE: bathymetry file

Youngling Posts: 21 Join Date: 3/24/13 Recent Posts
Hi again Arnold
I forgot to say this...
no I mean shore line not bathymetry....
my main model is sediment transport and in addition to model bathymetry changes I want to model shore line....
the model is near a port and I want to find the amount of sediment that will included in the transportation along shore....
I think it would be a 1 or 2 dimension model....
I am not sure if this capability has been included in Delft 3D....cause I never encountered a word like shore line or along shore sediment transport in flow manual....
Thanks a lot for you help
U
Arnold van Rooijen, modified 7 Years ago.

RE: bathymetry file

Hi Souroush,

I looked at your dep and grd-files and I think there are two important issues:
- Not all grid points have a depth value yet (you can see this when you load both files into Quickin, you will see that at the borders your bathymetry is not colored). You can also click on 'edit depth' and check that at a large number of points it says -999.
- It seems like your bathymetry as z-coordinates rather than depth. You can simply change this by mulitplying your bathymetry with -1.

Not related to your question, but I noticed that your grid is quite coarse. Basically your go with 12 grid cells from an offshore depth of 30m to 0m. This means that on average the height difference is 2.5 m (in the model this will result in some kind of staircase pattern). I suggest you make the grid a lot finer.

As for your other question, you cannot use Delft3D as a shoreline/coastline model, but you could definitely setup a 2D or 3D model and compute alongshore sediment transport. But you are basically modeling morphology, the shoreline you will have to get out of the results yourself (e.g. by comparing your bathymetry and the water level).

Hope this helps.

Cheers,
Arnold
SS
Soroush Safaei, modified 7 Years ago.

RE: bathymetry file

Youngling Posts: 21 Join Date: 3/24/13 Recent Posts
hi Arnold

Thanks again
I know this one and it's a bit weird to me cause last month (again before I had to reinstall my windows) I see all these depth files in visualization area for all the grid points and now I just can't. so if I get it well I think I should make the grid files and bathymetry again and try to check in in edit depth.
and by the 2 clause you mean that in my bathymetry file I should multiply data with -1??

yes I thought that too. it should be really finer. and as you said this I remember that the other time that I didn't have the problem the mesh was finer!!!
thanks for the great suggestion...

that sounds fine. it was just a thing that my advisor asked me to do. I think I can do that with MIKE...or as you said I can compare the results...

Thanks a lot Arnold. this was really helpful...I will check that in my model and I hope these suggestions fix my problem.

and I know I had lots of questions but I still have a lot more!!!!
are you working on sediment transport?
can I have your email address?

this was such a great help
thanks for your time


cheers
soroush
U
Arnold van Rooijen, modified 7 Years ago.

RE: bathymetry file

Hi Soroush,

In answer to your questions:

- Delft3D uses bathymetry information specified in water depths (meaning that your offshore depth is positive, while your onshore, dry part is negative). It looks like your data is in z-coordinates such that your offshore is negative and your onshore positive (so not water depth, but vertical level). You can simply reverse this by multiplying everything by -1. For instance: if your offshore bed level is -30 m it should be 30m and if your coast bed level is at +3m it should become -3m.

- If you are really looking for a coastline model (i.e. a model in which the shoreline simply moves onshore or offshore as a result of alongshore sediment transport gradients) you could also try UNIBEST-CL+. I don't have much experience on these models, but worked a bit with UNIBEST and that seems like the type of model you would need. But again, you can also use Delft3D for it, you will just take into account much more processes I would say (2D effects, currents, setup etc.).

No problem, I think a lot of people are struggling with difficulties when starting and using models, so it's great that we have this forum to share our experiences and help each other. For this reason I also recommend you to keep posting your questions on this forum, because you will help other users as well by doing so. Especially when posts are well organized, a forum like this can work as a great source of information. I included my email address at the bottom just in case, but if you think your question can also help other users, please post it on the forum .

Cheers,
Arnold (arnold.vanrooijen@deltares.nl)
SS
Soroush Safaei, modified 7 Years ago.

RE: bathymetry file

Youngling Posts: 21 Join Date: 3/24/13 Recent Posts
Hi Arnold


This was the best help I ever had during this comments. I think my problem will be solved soon. Thanks a million times.
I really like to use the forum but before you answer my question, for the previous posts that I had, I rarely got an answer or if someone answer it, it took a month!!!
and most of the times I solve the problem myself!!
I will keep on posting my questions in here only if it is not that much urgent....
thanks many many times for the time you put for answering this....it was the best help even since I start to work with delft3D...

cheers
soroush
Vasudevan shankar, modified 3 Years ago.

RE: bathymetry file

Youngling Posts: 4 Join Date: 12/31/14 Recent Posts
HI Arnold van Rooijen
I am a new user for using delft3d, I used Gebco depth file from dashboard. I made the grid refined from rgfgrid and exported, then open the refined grid file in quikin and imported gebco depth data. "depth does not fit" message came. Here i have attached my dep, grid and mdf file.
Regards
Vasudevansankar
CC
Cesar Cerda, modified 5 Years ago.

RE: bathymetry file

Youngling Posts: 4 Join Date: 6/1/15 Recent Posts
Hello , my name is Cesar . I am new to this program and I have trouble when I see the grid in " visualization area" when I'm in the "wave input" window. It was the file " swan and throws me an error saying " terminating error: . Input file missing "Do you know how to solve this as I did not and had positive results and when I run the program I appear errors Before I could visualize the grid do? . 2 months, but now I can not see the grid. I tried to see if the problem is rgdfrid or QuickIN but but I can visualize the grid in the window of input flow . Please help
Adri Mourits, modified 5 Years ago.

RE: bathymetry file

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

To perform a calculation with Delft3D-WAVE:
1. Create a grid using RGFGRID in the grid group in the Delft3D-GUI. This will result in a file with extension ".grd"
2. Prepare the WAVE input via the "WAVE input" window in the wave group in the Delft3D-GUI. This will result in a file with extension ".mdw", containing references to other files, including your grid file
3. Run your calculation by pressing the "Start" button in the wave group in the Delft3D-GUI and selecting your mdw-file.
4. If during the calculation SWAN reports an error, please check the files in the working directory. SWAN writes messages to an errorfile.

Please use the manuals.

Regards,

Adri
CC
Cesar Cerda, modified 4 Years ago.

RE: bathymetry file

Youngling Posts: 4 Join Date: 6/1/15 Recent Posts
Thanks for the reply, ME helped tremendously. I could SOLVE THE PROBLEM