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: 
/web/delft3dfm/forum

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

=======================================================

** PLEASE TAG YOUR POST! **

 

 

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

 


Message Boards

Different types of boundary conditions

LT
Luciana Tessarolo, modified 7 Years ago.

Different types of boundary conditions

Youngling Posts: 15 Join Date: 5/9/13 Recent Posts
Dears,

I have a doubt about the boundary conditions.

In my simulation, I have one open boundary and I would like to insert two types of boundary condition in this boundary section.

For exemple: first, I choose the boundary section and select water level boundary with astronomical forcing. After, I want to repeat the same boundary section and select current (velocity) boundary with time-series forcing. I would like to know if this is possible.

Could you, please, help me?

Thank you very much!!

Regards,
Luciana
Adri Mourits, modified 7 Years ago.

RE: Different types of boundary conditions

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

If I understand you correctly, you want to run a model, starting with an astronomical water level boundary, and at a certain time during the run, switch to a time serie current boundary.

I don't think that will work. The closest you can get to this is to split the simulation into two simulations. First run the astronomical water level part, writing output to the map file. When this simulation is finished, run the second simulation with the time serie current boundary, restarting with the map file of the first run. Be sure to switch of smoothing in the second run.

Regards,

Adri
LT
Luciana Tessarolo, modified 7 Years ago.

RE: Different types of boundary conditions

Youngling Posts: 15 Join Date: 5/9/13 Recent Posts
Hi Adri,

I thought about using the two boundary types (water level and current) for the same boundary section and in the same run. For this, I would repeat twice the same boundary section in my bnd file, however with different options (Z A and C T). Is this possible?

Thank you very much!

Regards,
Luciana
Adri Mourits, modified 7 Years ago.

RE: Different types of boundary conditions (Answer)

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

I never (heard someone) tried it. But I don't expect that will work. The administration will be messed up, and it is not possible to specify a time period for the astronomical condition to be active (other than the full simulation period).

I really think you have to cut it into two runs.

But it is easy to give it a try. Please report back your findings here on the forum.

Thanks.

Adri
LT
Luciana Tessarolo, modified 7 Years ago.

RE: Different types of boundary conditions

Youngling Posts: 15 Join Date: 5/9/13 Recent Posts
Hi Adri,

Thank you very much for your attention!

I will keep trying.

Regards,
Luciana