Dear Zhenghuai Guo,
You can build getfem and getfem based programs using either GCC c++
compiler for Linux based systems
(read Page 5 of the user doc:
http://download-mirror.savannah.gnu.org/releases/getfem/doc/gmm_userdoc.pdf)
or with Microsoft Visual Studio (you can use free Community edition). You
can find MSVC solution in msvc directory of the distribution.
Unfortunately, the solution for MSVC is not kept up-to-date and you would
need to re-add all getfem sources to it to make it work.
You can deform your mesh with a simple call:
auto deformator = temporary_mesh_deformator(mf, U, true, false);
//the first true means "deform on creation", the second false means "do
not restore the mesh back when temporary_mesh_deformator reaches the end of
life"
mf - is the mesh_fem for your displacement field and U is the
displacement vector with gmm::vect_size(U) = mf.nb_dof();
Best regards,
Andriy
On Thu, 8 Nov 2018 at 01:15, Zhenghuai Guo <[email protected]>
wrote:
> Dear Andriy,
>
>
>
> Thank you for your explanation.
>
>
>
> Regarding creep, at the moment I only use liner_elasticity_brick with
> young’s modulus being changed on each time-step. This is just to start
> with. I am new in Getfem in fact.
>
>
>
> Could you please advise about the follows?
>
>
>
> 1. Are you using c++ to run getfem? If so, can you give some hints
> how I can to it? I can’t see any instruction about setting up for c++.
> 2. If you don’t use c++, how do you normally use the
> *getfem::temporary_mesh_deformator
> (from getfem_deformable_mesh.h) or other C functions? *
>
>
>
> I was trying to see if it is possible to use this function in Python
> interface by using SWIG or Python.Boost. But it is far beyond my knowledge.
>
>
>
> Thank you very much
>
>
>
> Regards
>
> Zhenghuai Guo
>
>
>
> *From:* Andriy Andreykiv <[email protected]>
> *Sent:* Wednesday, November 7, 2018 8:32 PM
> *To:* Zhenghuai Guo <[email protected]>
> *Cc:* [email protected]
> *Subject:* Re: [Getfem-users] mesh_deformation
>
>
>
> Dear Zhenghuai Guo,
>
>
>
> I don't use Python interface much, but your assumption is correct,
> using getfem::temporary_mesh_deformator (from getfem_deformable_mesh.h)
> you can apply displacement field to the mesh.
>
> By default temporary_mesh_deformator will deform the mesh and un-deform
> it in the destructor, unless you build it with the argument
> to_be_restored=false.
>
> I only assume that you can do it with Python too.
>
>
>
> I'm not really experienced with creep, but intuitively I would assume that
> you can also use large deformation formulation to account for the change in
> geometry.
>
> Or it's not how you intend it?
>
>
>
> In your follow up email you are asking about the usage of mesh slices.
> From what I know it's used primarily for post-processing, not calculation.
> If you intend to use it solely for
>
> post-processing than you can easily achieve it nowadays with Paraview,
> were you import a vtk file, warp the result with a displacement field and
> take a desired slice.
>
>
>
> Best regards,
>
> Andriy
>
>
>
> On Sat, 3 Nov 2018 at 12:33, Zhenghuai Guo <[email protected]>
> wrote:
>
> 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*
>
>
>
>
>
>
>
>
