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

Wrong coupling point error

DM
Drew Mahedy, modified 6 Years ago.

Wrong coupling point error

Youngling Posts: 6 Join Date: 4/18/13 Recent Posts
I'm attempting to run a 4 sub-domain decomposition model but I keep receiving the following error:

Part III - Initialisation of the Execution module...
runid : HCR_Dp1_upper
*** WARNING Double precision computation using reals of kind 8
Part IV - Reading complete MD-file...
Part V - Initialisation & checking input...
Part VI - Initialisation & checking second part...
ABORT: (n0,i6)
1) Error during initialization of subdomains: check tri-diag files.
OR
2) "HCR_Bp1_estuary": Wrong coupling point at ( 1,38) Kcs=0 KcsInside=0

I originally copied over all the grd, mdf, ddb, dep, bnd files over from another run that used constant Chezy values so this new run should be identical in every way except for the variable roughness values. In attempting to fix this problem, I tried recreating the DD boundaries but still got the same error. Roughness values were created in Matlab based on the depth values which were originally corrected to have identical depths along the boundary for connected sub-domains. I checked the roughness values in Quickin and they match up along the boundaries.

I'm currently running the FLOW GUI v. 3.41.06 on Windows 7

Any ideas?
Jack Shipton, modified 6 Years ago.

RE: Wrong coupling point error

Youngling Posts: 9 Join Date: 12/14/12 Recent Posts
I don’t have any examples to hand, but I seem to remember getting a similar sounding error messages if I accidently leave in negative values in a spatially varying RGH map.

For example if nul values (e.g -999) are created for any ‘empty’ cells after using Quickin….

For this I do a quick find / replace in textpad to a background roughness value.

Good luck,

Jack
Adri Mourits, modified 6 Years ago.

RE: Wrong coupling point error (Answer)

Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Drew,

Does the tri-diag file contain any additional information?

You must use RGFGRID to produce the ddb file. DD is sensitive for the order and orientation of the coupling boundaries.

Regards,

Adri
Abbas Hooshmand, modified 4 Years ago.

RE: Wrong coupling point error

Youngling Posts: 4 Join Date: 3/5/15 Recent Posts
Hello,

I am trying to do Domain Decomposition. I already have a model containing 7 sub-domains that works perfectly. I am trying to add another sub-domain, making it into total 8 sub-domains. The new subdomain is a channel called "channel.grd". However, I get an error:

---------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------
Deltares, FLOW2D3D Version 6.01.07.3574, Apr 2 2014, 11:35:11
flow2d3d.dll entry Flow2D3D::Run
--------------------------------------------------------------------------------

Part I - Initialisation Time Dep. Data module...
runid : pug2
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...
d_hydro ABORT: [Iterator]
1) Error during initialization of subdomains: check tri-diag files.
OR
2) "channel": Wrong coupling point at ( 2, 2) Kcs=0 KcsInside=1

child process exited abnormally

---------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------

From reading this forum I have made sure sure to do these things:
1) I use RGFGRID to make my ddb file, not manually with text edtors
2) I make sure to delete all com and trih files after each run
3) I do not have any dry points defined in Channel or pug2

Is it possible that the connection between pug2 and channel contains just inactive cells? How can I make sure that inactive cells are the problems? How do I fix it?

I have attached the ddb file, and trih files for pub2 and channel to this message. I'd appreciate any help. Thanks.

Abbas
Adri Mourits, modified 4 Years ago.

RE: Wrong coupling point error

Yoda Posts: 1224 Join Date: 1/3/11 Recent Posts
Hi Abbas,

Your method looks good. Can you zip your full set of input files and attach that to a post on this forum?

Thanks.

Regards,

Adri