Re: [deal.II] How to transform points on faces from unit cells to real cells?

2020-06-22 Thread Lex Lee
t 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, >>> >>> >>> Thanks for you

Re: [deal.II] How to transform points on faces from unit cells to real cells?

2020-06-22 Thread Lex Lee
> 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.

Re: [deal.II] How to transform points on faces from unit cells to real cells?

2020-06-22 Thread Lex Lee
gt; 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_unit

[deal.II] Re: How to transform points on faces from unit cells to real cells?

2020-06-21 Thread Lex Lee
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

[deal.II] How to transform points on faces from unit cells to real cells?

2020-06-20 Thread Lex Lee
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 .

[deal.II] Re: How to get normal / tangential vectors at nodes, not at quadrature points?

2020-06-05 Thread Lex Lee
gt; 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 Lee wrote: >

[deal.II] How to get normal / tangential vectors at nodes, not at quadrature points?

2020-06-04 Thread Lex Lee
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

[deal.II] How to simplify a 2D complex problem to a '1D-like' problem?

2020-04-24 Thread Lex Lee
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

[deal.II] Debug to identify pairs of DoFs that are co-lated and correspond to the components.

2020-04-05 Thread Lex Lee
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:

[deal.II] How to set up constraints for several different variables at the boundary?

2020-03-27 Thread Lex Lee
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

Re: [deal.II] How to Make Test Functions Satisfy Certain Constraints

2020-02-17 Thread Lex Lee
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 should

[deal.II] How to Make Test Functions Satisfy Certain Constraints

2020-02-16 Thread Lex Lee
. If so, can anyone give me some hints, I mean, study/reading material? Best, Lex Lee -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed