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Today's Topics:

   1.  BC's - 1D Hermite elements (Roberto Federico Ausas)
   2. Re:  BC's - 1D Hermite elements (Patrick Farrell)
   3.  Problem installing Firedrake (Smail Merabet)


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Message: 1
Date: Mon, 6 Apr 2020 16:49:25 -0300
From: Roberto Federico Ausas <rfausas@icmc.usp.br>
To: firedrake@imperial.ac.uk
Subject: [firedrake] BC's - 1D Hermite elements
Message-ID:
        <CAH6Ec4nWnhmM=HeMtd8uU9VQ9NF0_hVdorMFdK=p8Xc3Gus4xQ@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hello,

My name is Roberto. I'm currently a professor in the Applied Mathematics
Department of Univ. of S?o Paulo at S?o Carlos.

I'm working on some fluid-structure interaction problems in which the solid
will be modeled as a 1D beam. Our reference integration domain will be the
interval [0,L].

We are planning to use firedrake and Hermite elements. The problem is
nonlinear.

I already have a working example. Values degrees of freedom are easy to
impose by using DirichletBC(), however I'm not figuring out how to enforce
derivatives degrees of freedom as boundary conditions (let say at x=0),
which I need for a clamped beam.

Any help or trick would be appreciated
Regards

--
Roberto F. Ausas
Instituto de Ci?ncias Matem?ticas e de Computa??o - ICMC/USP
S?o Carlos, SP - Brasil
*http://www.lmacc.icmc.usp.br/~ausas* <http://www.lmacc.icmc.usp.br/~ausas>
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Message: 2
Date: Mon, 6 Apr 2020 20:57:06 +0100
From: Patrick Farrell <patrick.farrell@maths.ox.ac.uk>
To: firedrake@imperial.ac.uk
Subject: Re: [firedrake] BC's - 1D Hermite elements
Message-ID: <4a52e3a8-1bca-249c-b9ff-304237289370@maths.ox.ac.uk>
Content-Type: text/plain; charset=utf-8; format=flowed

Hi Roberto,

I did this before. I projected some functions onto 1D Hermite spaces to see
which dofs are the derivative value at the endpoints. In the end I implemented

             class FixHermiteDerivativeValue(DirichletBC):
                 @utils.cached_property
                 def nodes(self):
                     if V.mesh().mpi_comm().size > 1: raise NotImplementedError
                     return [1] # the derivative component of the left endpoint

             bcs = [FixHermiteDerivativeValue(V, 0, "on_boundary")]

This only fixes the derivative at the left; I guess the derivative on the right will be [-1],
but am not sure. The "on_boundary" is ignored; I just kept it to not have to override the
constructor of DirichletBC.

Hope this helps,

Patrick


On 06/04/2020 20:49, Roberto Federico Ausas wrote:
> Hello,
>
> My name is Roberto. I'm currently a professor in the Applied Mathematics Department of Univ. of S?o Paulo at S?o Carlos.
>
> I'm working on some fluid-structure interaction problems in which the solid will be modeled as a 1D beam. Our reference integration domain will be the interval [0,L].
>
> We are planning to use firedrake and Hermite elements. The problem is nonlinear.
>
> I already have a working example. Values degrees of freedom are easy to impose by using DirichletBC(), however I'm not figuring out how to enforce derivatives degrees?of freedom as boundary conditions (let say at x=0), which I need for a clamped beam.
>
> Any help or trick would be appreciated
> Regards
>
> --
> Roberto F. Ausas
> Instituto de Ci?ncias Matem?ticas e de Computa??o- ICMC/USP
> S?o Carlos, SP - Brasil
> _http://www.lmacc.icmc.usp.br/~ausas_
>
> _______________________________________________
> firedrake mailing list
> firedrake@imperial.ac.uk
> https://mailman.ic.ac.uk/mailman/listinfo/firedrake
>




------------------------------

Message: 3
Date: Tue, 7 Apr 2020 08:10:54 +0100
From: Smail Merabet <merabetsmail@gmail.com>
To: firedrake@imperial.ac.uk
Subject: [firedrake] Problem installing Firedrake
Message-ID:
        <CAEo0a_H1WQ=jFvkjeW5RiT4KkKM7PhF3-ya2X2pE2mjggKopeA@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hi firedrake users,
I have a problem with the installation of firedrake,
I work on Mojave 10.14.6
I did the following steps:
url -O
https://raw.githubusercontent.com/firedrakeproject/firedrake/master/scripts/firedrake-install
unset PYTHONPATH
unset PETSC_DIR
unset PETSC_ARCH;
python3 firedrake-install

the installation see to be done, I attached the log file to this email, but
when I  excuse any script I get the following error message

(firedrake) (base) Merabets-MacBook-Pro:examples merabet$ python3 fi.py

Traceback (most recent call last):

  File "/Users/merabet/firedrake/src/h5py/h5py/__init__.py", line 26, in
<module>

    from . import _errors

ImportError: dlopen(/Users/merabet/firedrake/src/h5py/h5py/_
errors.cpython-37m-darwin.so, 2): Library not loaded:
@rpath/libhdf5.103.dylib

  Referenced from: /Users/merabet/firedrake/src/h5py/h5py/_
errors.cpython-37m-darwin.so

  Reason: image not found


During handling of the above exception, another exception occurred:


Traceback (most recent call last):

  File "fi.py", line 1, in <module>

    import firedrake

  File "/Users/merabet/firedrake/src/firedrake/firedrake/__init__.py", line
53, in <module>

    from firedrake.checkpointing import *

  File "/Users/merabet/firedrake/src/firedrake/firedrake/checkpointing.py",
line 3, in <module>

    from firedrake.cython import hdf5interface as h5i

  File "firedrake/cython/hdf5interface.pyx", line 2, in init
firedrake.cython.hdf5interface

  File "/Users/merabet/firedrake/src/h5py/h5py/__init__.py", line 30, in
<module>

    raise ImportError("You cannot import h5py from inside the install
directory.\nChange to another directory first.")

ImportError: You cannot import h5py from inside the install directory.

Change to another directory first.

(firedrake) (base) Merabets-MacBook-Pro:examples merabet$
Please, could any one help me to solve this problem ?


Best regards
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End of firedrake Digest, Vol 40, Issue 4
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