I mean one boundary has the first kind bc, while the second has neumann bc. so What is the bc for the intersection nodes.
ztdepyahooztdepya...@gmail.com
Hello Wolfgang,
thanks very much for your information.
I got the point.
Best regards
Lance
Wolfgang Bangerth 于 2023年11月13日周一 21:01写道：
>
> On 11/13/23 03:05, Lance Zhang wrote:
> >
> > I wonder whether the stiffness matrix could be converted to a matrix
> > with rows = cell_numbers and columns
On 11/13/23 03:05, Lance Zhang wrote:
I wonder whether the stiffness matrix could be converted to a matrix
with rows = cell_numbers and columns = cell_numbers.
Lance:
I think I mentioned this before: You can't. The entries of the stiffness
matrix are sums over contributions from different
Hello everyone!
This is deal.II newsletter #269.
It automatically reports recently merged features and discussions about the
deal.II finite element library.
## Below you find a list of recently proposed or merged features:
#16265: Look-up table for Hermite (proposed by ivweber)
https://github
Hi there,
People use many different boundary conditions with deal.II - e.g., step-22 sets
the normal component of the normal stress to zero, whereas many other tutorial
programs use Dirichlet or Neumann boundary conditions.
Which two boundary conditions are you referring to?
Best,
David Wells
If you need any help, feel free to reach out to the deal.II community, we
are always glad to help
On Sunday, November 5, 2023 at 10:37:42 a.m. UTC-5 M. Bakry wrote:
> Dear Wolfgang,
>
> thanks very much for your answer. I think I will give it a try when I
> find some time. Non-C1 manifolds are
Changing to Fe1 really alters the solution, so consequently the kelly error
estimator will also give you a different error estimation and thus a
different mesh adaptation.
If your mesh adaptation is based on an error estimator, altering the finite
element interpolation order will alter the solut
Hello Wolfgang,
thanks for your reply.
I wonder whether the stiffness matrix could be converted to a matrix with
rows = cell_numbers and columns = cell_numbers.
I tried to write the gradient with rows = degree_of_freedom into with rows
= cell_numbers.
###
for (unsigned int i =
