Model wont run - errors/not orthogonal - Forum - Delft3D Flexible Mesh

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Model wont run - errors/not orthogonal

Anonymous, modified 8 Years ago.

Model wont run - errors/not orthogonal

Post: 1

Hi,

I'm new to using Delft 3d flexible mesh and am just trying to get a simple model running.
I made a grid for my area (SWgridx_net.nc) which when I went to orthogonise came up with a node highlighted in yellow and an error message (pic1).
I couldn't figure out what was wrong and tried fixing it but only thing that allowed me to orthogonise the grid that I could work out was to just delete the offending point, I then added a bed level (.xyz file) and the mesh saved from this grid and bed level (grid28617finish.nc) is shown in pic2. But when i go to run the model it comes up with an error saying not orthogonal (pic3).
What can I do to fix this and get the model to run?

Thanks,Lucy

Jing Zhao, modified 8 Years ago.

RE: Model wont run - errors/not orthogonal (Answer)

Padawan Posts: 29 Join Date: 7/12/16 Recent Posts

Dear Lucy,

As mentioned in the User Manual, orthogonality is very important for accuracy: advised orthogonality values for your grid are around 0.01. The current threshold is 0.5, already quite high.

You could use RGFGRID to improve your grid orthogonality. You need to make the grid orthogonality satisfied before running the model.

Kind regards,

Jing Zhao

Deltares

Lucy Tilsley, modified 8 Years ago.

RE: Model wont run - errors/not orthogonal

Youngling Posts: 2 Join Date: 6/28/17 Recent Posts

Ok, thanks I'll try to improve the orthogonality

Thanks
Lucy

Camille Grimaldi, modified 6 Years ago.

RE: Model wont run - errors/not orthogonal

Youngling Post: 1 Join Date: 5/28/18 Recent Posts

Hi Jing,

I have the same error but I don't see what I need to fix as my grid's orthogonality is 0.01 everywhere (see attached). Any idea of where else that could come from?

Thanks,

Camille

Michal Kleczek, modified 6 Years ago.