how to set the boundary name day and output to the file.

[ztdep...@gmail.com]

I am running the first example "first_grid". I want to know does deal.ii support the defination of the boundary name and output  it to a readable file. 

I have output the grid to ucd  file , but no boundary infors are stored in the ucd file. 

 Could you please give me some advices.

[Wolfgang Bangerth]

On 10/28/22 04:37, ztdep...@gmail.com wrote:
> **

You might want to read through the documentation of the GridOut class. There
are ways to also output boundary indicators, at least for some formats, via
the various *Flags data structures.

Best
W.

--
------------------------------------------------------------------------
Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/

[ztdepyahoo]

Thanks, how to set the 4 corner nodes coordates of  a square domain. 

	ztdepyahoo
ztdep...@gmail.com

---- Replied Message ----

From	Wolfgang Bangerth<bang...@colostate.edu>
Date	10/28/2022 22:41
To	<dea...@googlegroups.com>
Subject	Re: [deal.II] how to set the boundary name day and output to the file.

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[Wolfgang Bangerth]

On 10/28/22 09:54, ztdepyahoo wrote:
> Thanks, how to set the 4 corner nodes coordates of  a square domain.

This is too short of a question. You've got to be more clear about what
you're asking since I have no idea what the problem is :-)

[ztdepyahoo]

I want to set the boundary coordinates of the GridGenerator::hyper_cube(triangulation). 

	ztdepyahoo
ztdep...@gmail.com

---- Replied Message ----

From	Wolfgang Bangerth<bang...@colostate.edu>
Date	10/29/2022 00:30

To	<dea...@googlegroups.com>
Subject	Re: [deal.II] how to set the boundary name day and output to the file.

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[Wolfgang Bangerth]

On 10/28/22 10:31, ztdepyahoo wrote:
> I want to set the boundary coordinates of
> the GridGenerator::hyper_cube(triangulation).

Well, have you looked at the documentation of the function?
https://dealii.org/developer/doxygen/deal.II/namespaceGridGenerator.html#acea0cbcd68e52ce8113d1134b87de403
And at the other functions that are in that namespace, for example the
hyper_rectangle function mentioned in the documentation linked to above?

[Technical Forex]

I read in the uvn file generated by salome mesh with gridin. But it gives me the following error . Attachment please find the unv file. I couldn't find what caused the error.

terminate called after throwing an instance of 'dealii::StandardExceptions::ExcIO'
 what():   
--------------------------------------------------------
An error occurred in line <864> of file </home/ztdep/Downloads/dealii-9.4.0/source/grid/grid_in.cc> in function
   void dealii::GridIn<dim, spacedim>::read_unv(std::istream&) [with int dim = 2; int spacedim = 2; std::istream = std::basic_istream<char>]
The violated condition was:  
   in.fail() == false

Wolfgang Bangerth <bang...@colostate.edu> 于2022年10月29日周六 00:47写道：

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[ztdepyahoo]

Thanks a lot. 

When i output the grid to vtk., I found that the coordinates is in float number, how to control the output precision .

Regards

	ztdepyahoo
ztdep...@gmail.com

---- Replied Message ----

From	ztdep...@gmail.com<ztdep...@gmail.com>
Date	10/28/2022 18:37
To	deal.II User Group<dea...@googlegroups.com>
Subject

[deal.II] how to set the boundary name day and output to the file.

I am running the first example "first_grid". I want to know does deal.ii support the defination of the boundary name and output  it to a readable file. 

I have output the grid to ucd  file , but no boundary infors are stored in the ucd file. 

 Could you please give me some advices.

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[Wolfgang Bangerth]

On 10/28/22 21:00, Technical Forex wrote:
> I read in the uvn file generated by salome mesh with gridin. But it gives me
> the following error . Attachment please find the unv file. I couldn't find
> what caused the error.
>
> terminate called after throwing an instance of
> 'dealii::StandardExceptions::ExcIO'
>  what():
> --------------------------------------------------------
> An error occurred in line <864> of file
> </home/ztdep/Downloads/dealii-9.4.0/source/grid/grid_in.cc> in function
>    void dealii::GridIn<dim, spacedim>::read_unv(std::istream&) [with int dim
> = 2; int spacedim = 2; std::istream = std::basic_istream<char>]
> The violated condition was:
>    in.fail() == false

UNV is a terrible file format. It is, in essence, a memory dump of a program
that was written many decades ago. It is a disaster to parse because there are
so many things that can appear in these files.

Can you let SALOME export the mesh in any other format?

[Wolfgang Bangerth]

On 10/29/22 22:25, ztdepyahoo wrote:
> When i output the grid to vtk., I found that the coordinates is in float
> number, how to control the output precision .

You can just set the precision on the output stream to which you write the
information. This works in essence like this:
std::ofstream out ("my_output_file.vtk");
out.precision(16);
data_out.write_vtk(out);

I haven't tested this, but believe that it should work.