Hello Deal.ii Friends,
I want to set 2 constraints (P = 0 and \delta P = 0) on the scalar pressure
variable on a single point (4, 0.1) at the outlet. Here, \delta P is the
Newton's iteration update value for P.
I used "constraints_hp_nonzero" to interpolate the real boundary values for
my phys
ion is this? What OS version do you have (i.e., is this
>>> sonoma?). If you upgraded to sonoma, and are still using the old package,
>>> this cannot work, since the compiler has changed with the upgrade.
>>>
>>> If you use the 9.5.2 package, deal.II comes pre-insta
> this cannot work, since the compiler has changed with the upgrade.
>
> If you use the 9.5.2 package, deal.II comes pre-installed. Does that work
> for you?
>
> L.
>
> > On 3 Feb 2024, at 21:35, Lex Lee wrote:
> >
> > I got the following error message
rth
wrote:
> On 2/3/24 13:35, Lex Lee wrote:
> >The C++ compiler
> >
> >
> >
> > "/Applications/
> deal.II.app/Contents/Resources/spack/lib/spack/env/clang/clang++"
> >
> >
> >is not able to compile a simple test program.
> >
I got the following error messages
-- Detecting CXX compiler ABI info - failed
-- Check for working CXX compiler:
/Applications/deal.II.app/Contents/Resources/spack/lib/spack/env/clang/clang++
-- Check for working CXX compiler:
/Applications/deal.II.app/Contents/Resources/spack/lib/spack/
these 3 inputs are not on the locally owned cells.
Lex
On Wednesday, October 25, 2023 at 12:53:09 PM UTC-7 Wolfgang Bangerth wrote:
>
> On 10/25/23 13:31, Lex Lee wrote:
> >
> > Actually it is the output error message from the command line.
>
> Then how do you know that the
I suspect this is some output you get from the debugger?
No, not from the debugger.
Actually it is the output error message from the command line.
Lex
On Wednesday, October 25, 2023 at 12:23:32 PM UTC-7 Wolfgang Bangerth wrote:
>
>
> On 10/25/23 10:52, Lex Lee wrote:
> >
&
g Bangerth wrote:
>
> Lex,
> you show the backtrace, but what is the actual error message you observe?
> Best
> WB
>
> On 10/24/23 23:08, Lex Lee wrote:
> > *** Caution: EXTERNAL Sender ***
> >
> > Hello deal.ii develpoers,
> >
> >
> > In
I hope deal.ii group could release version 9.5.1 that works with intel
processor on MacOS platform.
On Monday, October 9, 2023 at 5:19:03 PM UTC-7 deal.II User Group wrote:
> Hello, everyone
>
> I tried the new image in my laptop with M2 processor and the Ventura Mac
> OS (13.6). It worked (I
parallel computation. It is inefficient and also likely incorrect if
> you run it before distribute_sparsity_pattern().
> Instead, use distribute_local_to_global during assembly (see step-40 for
> an example).
>
> --
> Timo Heister
> http://www.math.clemson.edu/~heister/
>
Hi Abbas, thanks for the reply. I did debug with option A, but no error
reported/no exception is thrown. To me, option A is the same as option B.
However, the two generated system matrixs in the code are not the same.
On Thursday, September 28, 2023 at 10:27:17 AM UTC-7 abbas.b...@gmail.com
wr
Hello all,
In my FSI problem, there are 4 vector-valued variables + 3 scalar
variables. Most of them are strongly coupled with each other. It's hard to
decouple the system and design a good preconditoner. Previously, I solved
the whole system with the direct solver (UMFPACK) + Newton's itera
Hello all,
Previously, I initialized my system matrix in this way (option A)
DoFTools::make_flux_sparsity_pattern(dof_handler,
dsp,
cell_coupling,
face_coupling);
constraints_newton_updat
"You record constraints in an AffineConstraints object,
and that continues to be the work in parallel as well"
Thanks a lot, Prof. Bangerth. I may misunderstand the error messages. I
will try to debug on other parts and keep this topic updated.
Best,
Lex
On Wednesday, September 13, 2023
Hello all,
I developed my FSI code based on the FENothing framework used in step-46.
Step-46 shows how to identify the interface between the fluid and solid
domain. Also it shows how to set constraints on variables and how to
assemble terms on the interface. I just used the same logic in my FS
obian-free Newton Krylov method, and want to play with
PETSc(snes) library. Thanks a lot.
Best,
Lex Lee
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Hello all,
I am using UMFPACK to directly solve my large system equation Ax=b. The
solver process is very slow, as only one core of CPU is involved while
running. I am trying to connect UMFPACK with Trilinos, I mean, solve the
equation in multithread / parallel mode in deal.II. I know some tut
the support points in real space:
>>
>> quadrature_point()
>> get_quadrature_points()
>>
>> Best,
>> Simon
>>
>> On Monday, June 22, 2020 at 10:53:10 PM UTC+2, Lex Lee wrote:
>>>
>>> Hello Doug,
>>>
>>>
>>> Than
> Best,
> Simon
>
> On Monday, June 22, 2020 at 10:53:10 PM UTC+2, Lex Lee wrote:
>>
>> Hello Doug,
>>
>>
>> Thanks for your help.
>>
>> However, I need to say, I just had done exactly what you described before
>> I posted this question.
t;
> Doug
>
> On Sunday, June 21, 2020 at 8:10:30 PM UTC-4, Lex Lee wrote:
> Hello Doug,
>
> Thanks for your kind help.
>
> I am trying to understand your suggestion in the original email.
>
> Are you suggesting me using the member function
> "transform
o project a "volume" point, but projecting within
> unit cell is easy, which you would then follow with
> transform_unit_to_real_cell().
>
> Best regards,
>
> Doug
>
> On Saturday, June 20, 2020 at 8:16:22 PM UTC-4, Lex Lee wrote:
>>
>> Hello Deal.II
Hello Deal.II Users,
I want to get the physical (geometry) coordinates for support points on
cell faces. Also I know that there are such member functions that can me
map points between reference and real cells in this link:
https://www.dealii.org/current/doxygen/deal.II/classMapping.html .
H
t;
> You can then use this quadrature in FEFaceValues to get the normals. Here,
> the weights of the dummy quadrature are inf, but if the normals are
> everything you need that isn't a problem.
>
> Best,
> Simon
>
> On Thursday, June 4, 2020 at 8:09:08 PM UTC+2, Lex L
Hello Deal.II Users,
I am working on setting a constraint: (V - v_s ) \cdot n = \phi_f (v_f -
v_s) \cdot n on three vector variables at the interface with affine
constraint class in Deal.II's library.
(Where, V, v_s, and v_f are velocity vectors on two different domains, and
they are coupl
Hello Deal.II Users,
I am using Deal.II to try to simplify/reduce my complex 2D problem to a
1D-like problem, namely, let the component values at x-direction of all
vectors be zero. (for example, V=[v_x, v_y]' = [0, v_y]') .
Moreover, given that the governing equations, boundary conditions a
Hello all,
I designed a coupled Laplace problem to play with ConstraintMatrix for
coupled components. On face \Gamma_4 and \Gamma_2, I let u=0.5v-0.5,
v=2u+1, respectively .
[image: Screen Shot 2020-04-05 at 4.14.41 PM.png]
Both u and v use the same finite element: FE_Q<*dim*>(1),
Hello all,
In order to handle the constraint : (v-v_s) \times n=\phi (v_f -v_s) \times
n at the boundary in my research problem, I designed the following test
problem to play with ConstraintsMatrix in deal.ii.
(n is the normal vector, and v, v_s, v_f are the velocities of three
phases. They
rent/doxygen/deal.II/Tutorial.html.
>
> Best,
> Daniel
>
> Am So., 16. Feb. 2020 um 23:45 Uhr schrieb Lex Lee >:
>
>> Hello all,
>>
>>
>> To numerically solve the governing equations I am studying now, I notice
>> that the chosen three test functions s
. If so, can
anyone give me some hints, I mean, study/reading material?
Best,
Lex Lee
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