Re: [Getfem-users] slicer_apply_deformation in python interface

[Yves Renard]

Dear Zhenghuai Guo,

In fact getfem::slicer_apply_deformation is more or less an internal  function which is called when a displacement is given in the slice operation and apply the deformation. You can see the explanation in the page http://www.getfem.org/python/cmdref_Slice.html. So if what you need is just to perform a cut of a dmesh deformed with a displacement, you can use the general form

sl = Slice(sliceop, {Slice sl|{Mesh m| MeshFem mf, vec U}, int refine}[, mat CVfids])

where U is the displacement applied to the mesh befor the slicing operation.

Best regards,

Yves

Le 13/11/2018 à 02:27, Zhenghuai Guo a écrit :

Dear Professor Renard,

 

Thank you for the advice. I couldn’t find any function in Python-interface to deform and create a new mesh. I understand that in c++ we can use getfem::slicer_apply_deformation, but in python, could you please advise what we can use for mesh deformation?

 

Thank you very much

Regards

Zhenghuai Guo

 

From: Yves Renard <address@hidden>
Sent: Wednesday, November 7, 2018 11:11 PM
To: Zhenghuai Guo <address@hidden>
Subject: Re: [Getfem-users] slicer_apply_deformation in python interface

 

Dear Zhenghuai Guo,

 

The use of slices for post-processing with the python interface is a bit explained in the page

http://getfem.org/python/cmdref_Slice.html

 

Unfortunately, there is no example of use in python test programs. You can find some examples however, in the matlab test programs (for instance interface/tests/matlab/demo_fictitious_domains_laplacian.m) the syntax being very close with python one.

 

Best regards,

 

Yves

 

 

Le 07/11/2018 à 03:02, Zhenghuai Guo a écrit :

Dear Sir or Madam,

 

I am using python interface getfem. I install it using the following command:

 

aptitude update and aptitude install python-getfem++ as instructed on http://getfem.org/download.html.

 

I would like to use the function ‘getfem::slicer_apply_deformation(mesh_slice_cv_dof_data_base &)’ as mentioned in the page 84 of getfem_userdoc.

 

Could you please advise how I can use it in python interface?

I did import getfem as gf,  but after that I couldn’t find it in the gf. List.

 

 

 

Thank you very much

Zhenghuai Guo

Tyree Xray CT network facility, School of Minerals and Energy Engineering Resources, UNSW Sydney

 

 

 

 

 

 

 

 

 

 

 

From: Zhenghuai Guo
Sent: Saturday, November 3, 2018 10:33 PM
To: 'address@hidden' <address@hidden>
Subject: mesh_deformation

 

Dear Sir or Madam,

 

Could you please advise how I and deform a mesh according to a displacement field?

 

I am trying to simulate a time dependent deformation of a cylinder like object using python-interface. After applying stress the object creeps with time.

 

I think I can just go with many small time steps. In each time step, I would like to update and deform the mesh according to the displacement calculated as a function of time. And the deformed mesh will be an input for next time step.

 

I can see there is some related information such as (1) ‘getfem_deformable_mesh.h’ in page 18 in https://download-mirror.savannah.gnu.org/releases/getfem/doc/getfem_project.pdf  (2) ‘getfem::slicer_apply_deformation’ in http://getfem.org/userdoc/export.html#getfem::slicer_apply_deformation . But I can find details examples.

 

Thank you very much

Zhenghuai Guo

Tyree Xray CT network facility, School of Minerals and Energy Engineering Resources, UNSW Sydney

 

 

 

 

-- 

  Yves Renard (address@hidden)       tel : (33) 04.72.43.87.08

  INSA-Lyon 

  20, rue Albert Einstein

  69621 Villeurbanne Cedex, FRANCE

  http://math.univ-lyon1.fr/~renard

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-- 

  Yves Renard (address@hidden)       tel : (33) 04.72.43.87.08
  INSA-Lyon 
  20, rue Albert Einstein
  69621 Villeurbanne Cedex, FRANCE
  http://math.univ-lyon1.fr/~renard

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