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! 


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: 

Post your questions, issues, suggestions, difficulties related to our Delft3D Flexible Mesh Suite on the new forum.





Sub groups
D-Flow Flexible Mesh
Cohesive sediments & muddy systems


Message Boards

Error starting flow

Anonymous, modified 6 Years ago.

Error starting flow

Posts: 1
Dear all,

I tried to run a flow simulation but got error as below,

Part I - Initialisation Time Dep. Data module...
runid : XXXX
*** full scale free slip calculation for HLES
Part II - Creating intermediate files...
ABORT: error returned by tdatmain
Flow exited abnormally
Check diagnosis file

child process exited abnormally

*** MESSAGE Reading BC-hydrodynamic file XXXX.bct
*** MESSAGE Reading BC-transport file ..\..\Bnd\XXXX.bcc
*** ERROR First time in ..\..\Bnd\XXXX.bcc > Simulation start time

*** End of tdatom for model: XXXX ***
*** 2014-05-28 11:58:33 ***

In the flow input,
reference date =01 01 2012 [dd mm yyyy]
Simulation start time =01 01 2012 [dd mm yyyy]
Simulation stop time =29 02 2012 [dd mm yyyy]
with a time step of 0.5 min.

In the .bcc file,

table-name 'Boundary Section : 1'
contents '3d-profile'
location 'N1 '
time-function 'non-equidistant'
reference-time 20120101
time-unit 'minutes'
interpolation 'linear'
parameter 'time ' unit '[min]'
parameter 'salinity end A layer 1 ' unit '[ppt]'
parameter 'salinity end A layer 2 ' unit '[ppt]'
parameter 'salinity end A layer 3 ' unit '[ppt]'
parameter 'salinity end B layer 1 ' unit '[ppt]'
parameter 'salinity end B layer 2 ' unit '[ppt]'
parameter 'salinity end B layer 3 ' unit '[ppt]'

records-in-table 60
0.0000000e+000 3.4030000e+001 3.4030000e+001 ...
1.4400000e+003 3.4060000e+001 3.4060000e+001 ...
8.4960000e+004 3.4340000e+001 3.4340000e+001 ...

Does anyone give some advice?
Thank you in advance.