As always there is a "deal.ii" way of doing the calculations.
The FEValues::get_function_gradients() is actually what I needed.
I got a little bit confused with the FEValues::get_normal_vectors(). This
seems to return the normal direction of the face and doesn't give any
further info about the
Thank you for your feedback.
I'll try to explain what I try to calculate with the help of a standard FEM
In the book the global system is partitioned so that the first row contains
the known U1 dofs and the second row the unknown the dofs U2.
This is a year old post but I'm dealing with the same issue so I decided to
continue here instead creating a new one.
In my case I solve a simple laplace problem, that represent groundwater
flow with non zero dirichlet boundary conditions
My goal is to estimate how much water comes in and out
No cmake finishes the configuration but the compilation breaks around 78%.
It seems that the undefined references that break the process are related to
boost iostream, which has failed the test
The deal.II project is located at http://www.dealii.org/
For mailing list/forum options, see
-- Performing Test BOOST_SERIALIZATION_USABLE - Success
Any further help?
On Thursday, March 28, 2019 at 8:41:07 PM UTC-7, Wolfgang Bangerth wrote:
> On 3/28/19 7:12 PM, Giorgos Kourakos wrote:
I tried to compile dealii using candi distribution.
Because I was getting several errors in the process from various packages,
I ended up updating the versions of the following packages
hdf5 -> 1.10.5
petsc -> 3.10.4
slepc -> 3.10.2
boost -> 1_69_0
However, during deal.ii compilation
That's very good to know
On Saturday, October 13, 2018 at 6:06:25 AM UTC-7, Giorgos Kourakos wrote:
> Hi, I need a clarification about the hanging nodes.
> At some point in my code I use
> mesh_constraints.resolve_indices(ids); which adds the constraints
to the desired position.
This simple trick works great so far.
Kudos to whoever came up with that !!
On Thursday, February 15, 2018 at 3:54:03 PM UTC-8, Wolfgang Bangerth wrote:
> On 02/15/2018 04:48 PM, Giorgos Kourakos wrote:
> > I haven't forgotten the Constraint
Hi deal.ii experts,
I have the following issue and I'd like if you could give me directions
what to look for.
I'm attaching a figure from two consecutive iterations:
The black line shows how the triangulation is split to different processors.
The red line indicates a Dirichlet boundary
em with your PETSc installation. Can you confirm
> that it is installed correctly?
> Do any problems appear if you compile deal.II without PETSc?
> Am Donnerstag, 11. August 2016 22:16:49 UTC+2 schrieb Giorgos Kourakos:
I'm trying to compile a recent version of deal and I'm getting the
following error during the tests as well as when I compile the step-1
../../lib/libdeal_II.g.so.8.4.1: error: undefined reference to
Any ideas what is wrong?
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