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

 

Message Boards

Wind drag coefficient

Fernando Barreto, modified 7 Years ago.

Wind drag coefficient

Padawan Posts: 74 Join Date: 6/21/12 Recent Posts
I am performing simulations in a region heavily affected by wind. And I would like to use other approach for calculating the wind drag coefficient. So I wonder which part of the code, in which routine, is responsible for reading and interpolation the Cd values given in . Mdf file. I would try to test another approach for calculating it.

Thanks

Fernando
wind drag coefficient wind
MS
Mihael Souza, modified 7 Years ago.

RE: Wind drag coefficient

Padawan Posts: 65 Join Date: 10/11/12 Recent Posts
Hi Fernando,

In the MDF file you can specify the wind drag through three breakpoints.
As I understand, these specified values are the ones that are going to be used in the computation.
In this case, you can calculate the wind drags by any means (the manual suggests the equations of Smith & Banke, 1975), and define the breakpoints (i.e. wind speeds) that are going to be used.

Hope this helps,

Kind regards,

Mihael Souza.
Fernando Barreto, modified 7 Years ago.

RE: Wind drag coefficient

Padawan Posts: 74 Join Date: 6/21/12 Recent Posts
Mihael, in fact I think that the only way is using the equation that is on page 212 of flow manual. I'm trying to discover in what routine is this equation programmed. Thank you for your help.

Fernando