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

D3D Flow Run won't start

SK
Sarah Kandrot, modified 6 Years ago.

D3D Flow Run won't start

Youngling Posts: 19 Join Date: 9/19/13 Recent Posts
Hello All,

I'm working on setting up my first model with my own data, but I can't seem to get Delft 3D flow to run - this comes up:

Starting Delft3D-FLOW computation ...
--------------------------------------------------------------------------------
Deltares, Delft3D-FLOW Version 4.00.04.757, Aug 23 2011, 18:06:51
flow2d3d.dll entry RUNME
--------------------------------------------------------------------------------

Part I - Initialisation Time Dep. Data module...
runid : r01
Part II - Creating intermediate files...
Part III - Initialisation of the Execution module...
Part IV - Reading complete MD-file...
Part V - Initialisation & checking input...
Part VI - Initialisation & checking second part...

And it just never starts. I checked my courant numbers in quickin, and based on my grid resolution and depth, I should be ok with a timestep of 5 mins (max Courant number is 4.53). I have attached my model files - would someone mind having a look? Any suggestions would be much appreciated!

-Sarah
SK
Sarah Kandrot, modified 6 Years ago.

RE: D3D Flow Run won't start

Youngling Posts: 19 Join Date: 9/19/13 Recent Posts
Additional required files attached
Adri Mourits, modified 6 Years ago.

RE: D3D Flow Run won't start

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

The file tri-diag.r01 in the work directory contains the following error message:
*** ERROR At least 2 observation points must be defined when writing to history file
To solve this, use the file r01.obs attached to this post.

Regards,

Adri

Attachments:

SK
Sarah Kandrot, modified 6 Years ago.

RE: D3D Flow Run won't start

Youngling Posts: 19 Join Date: 9/19/13 Recent Posts
Hello,

Ok, so I realised from the diag file that I needed another observation point, so I added one in. Now, it starts to run but it gets to 9.6% and I get this:

Time to finish 60s, 9.1% completed, time steps left 398
Time to finish 60s, 9.4% completed, time steps left 397
Time to finish 59s, 9.6% completed, time steps left 396
Flow exited abnormally
Check diagnosis file

I checked the diagnosis file (attached) and it seems the problem is velocity change and water levels are too high. I browsed through the forums and found a similar issue (http://oss.deltares.nl/web/delft3d/general/-/message_boards/view_message/295347?_19_redirect=http%3A%2F%2Foss.deltares.nl%2Fweb%2Fdelft3d%2Fgeneral%2F-%2Fmessage_boards%2Fsearch%3F_19_keywords%3DSgrThr%26_19_searchCategoryId%3D0%26_19_breadcrumbsCategoryId%3D0%26_19_redirect%3Dhttp%253A%252F%252Foss.deltares.nl%252Fweb%252Fdelft3d%252Fgeneral%252F-%252Fmessage_boards%253F_19_mbCategoryId%253D0#_19_message_295347) and you made a few suggestions. I tried reducing the timestep to 1 min instead of 5 to reduce the Courant no, but this didn't work. You also suggested:

"The input files contain an error.
Supressing the messages above will not solve this. You have to investigate the results just before the abort to find out where the eror is."

What do you mean by this?

And finally, you said:

"Delft3D-FLOW contains an error
If all other options fail, there might be a bug in the code. You can try to solve it yourself or report it to Deltares."

Do you think this may be the cause?

Your advice is very much appreciated!

Kind regards,

-Sarah
Adri Mourits, modified 5 Years ago.

RE: D3D Flow Run won't start

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

Please use a time step that fits with the CFL condition, see the manual section "4.5.3 Time frame".
Please analyse your output just before the crash to find out where it goes wrong (space and time) and what goes wrong.

Regards,

Adri