I printed out my map object after calling set_up_boundary_values and then
after calling assemble_system.
I was making some mistakes in filling the boundary_values in
asseble_system. I was fixing my 2 nodes on the top face in x.
I fixed that now.
But the bottom right node was still getting fixed in x.
Also, the top left node is fixed in x after calling set_up_system, although
it is then given overwritten with the prescribed value of y-displacement
after calling assemble_system.
I am writing the std::map boundary_values object at different instances
1. boundary values after set up bv
0 0
1 0
2 0
3 0
5 0
2.boundary values after assemble system
0 0
1 0
2 0
3 0
5 1.2 //this is prescribed value of y displacement on top face
7 1.2
Then, I commented out the following highlighted lines in
set_up_boundary_values:
const auto vert = cell->vertex(vertex_number);
if (std::fabs(vert(0) - (0)) < 1e-12 &&
std::fabs(vert(1) - (0)) < 1e-12)
{
types::global_dof_index x_displacement =
cell->vertex_dof_index(vertex_number, 0);
types::global_dof_index y_displacement =
cell->vertex_dof_index(vertex_number, 1);
types::global_dof_index x_displacement_multiplier =
cell->vertex_dof_index(vertex_number, 2);
types::global_dof_index y_displacement_multiplier =
cell->vertex_dof_index(vertex_number, 3);
boundary_values[x_displacement] = 0;
boundary_values[y_displacement] = 0;
*/*boundary_values[x_displacement_multiplier] = 0;
boundary_values[y_displacement_multiplier] = 0;*/*
}
else if (std::fabs(vert(0) - 1) < 1e-12 &&
std::fabs(vert(1) - (0)) < 1e-12)
{
std::cout<<"vert_0 = "<<vert(0)<<std::endl;
std::cout<<"vert_1 = "<<vert(1)<<std::endl;
types::global_dof_index y_displacement =
cell->vertex_dof_index(vertex_number, 1);
types::global_dof_index y_displacement_multiplier =
cell->vertex_dof_index(vertex_number, 3);
boundary_values[y_displacement] = 0;
* //boundary_values[y_displacement_multiplier] = 0;*
This gives me the expected values in the std::map.
Can you please explain what these lines do?
Thanks
Wasim
On Mon, Oct 17, 2022 at 9:46 AM Wolfgang Bangerth <bange...@colostate.edu>
wrote:
>
> Wasim:
> you already identified that something might be wrong with the boundary
> values
> map. So output the elements of the map and inspect them. Is the number of
> elements in the map as expected? Are the values in the map what you think
> they
> are?
>
> Best
> W.
>
>
> On 10/15/22 04:40, Wasim Niyaz Munshi ce21d400 wrote:
> > *** Caution: EXTERNAL Sender ***
> >
> > Hello everyone.
> >
> > I was able to apply the boundary conditions I mentioned earlier:
> > Fix the lower left node in both x and y, and also fix the lower right
> node in y.
> > The lower right node is free to move in x.
> > I am also applying a displacement in y on the top face.
> >
> > For this problem, both x and y displacement fields are expected to be
> linear.
> > y displacement filed is as expected.
> > I expect my x displacement field to be a linear function of x, zero
> for the
> > left face.
> > But, somehow, my nodes on the right edge are also being fixed in x. So,
> x
> > displacement is zero everywhere.
> >
> > I am unable to figure out why this is happening.
> >
> > I am creating std::map boundary_values object to apply my boundary
> conditions.
> > First, in setup_boundary_values(), I fill it with the boundary
> information
> > related to bottom 2 nodes.(Similar to step 79)
> > Next, I use the same boundary_values object to apply y displacement on
> the
> > top face as shown below:
> >
> > VectorTools::interpolate_boundary_values(dof_handler,
> > 1,
> >
> > Functions::ConstantFunction<2>(u_x_values,2),
> >
> boundary_values,u_x_mask);
> > //imposing u_x=0
> on top face
> > VectorTools::interpolate_boundary_values(dof_handler,
> > 1,
> >
> > Functions::ConstantFunction<2>(u_y_values,2),
> >
> boundary_values,u_y_mask
> > );//imposing
> > u_y=0.05 on top face
> >
> >
> > Thank You
> >
> > On Wednesday, October 12, 2022 at 9:59:35 PM UTC+5:30 Wasim Niyaz Munshi
> > ce21d400 wrote:
> >
> > Thank you Prof. Bangerth.
> >
> > I was indeed calling the setup_boundary_values() function before call
> > dof_handler.distribute_dofs().
> > I made the necessary adjustments.
> > It is working fine now
> >
> > Thanks
> >
> > Wasim Niyaz
> > Research scholar
> > CE Dept.
> > IITM
> >
> > On Tue, 11 Oct, 2022, 7:03 pm Wolfgang Bangerth, <
> bang...@colostate.edu>
> > wrote:
> >
> >
> > Wasim,
> > I imagine you are calling your setup_boundary_values() function
> before
> > you
> > call dof_handler.distribute_dofs()?
> > Best
> > W.
> >
> > On 10/11/22 05:16, Wasim Niyaz Munshi ce21d400 wrote:
> > > *** Caution: EXTERNAL Sender ***
> > >
> > > I was using a constraint object to apply the boundary
> conditions
> > and component
> > > mask to deal with hanging nodes and apply x and y
> displacements
> > separately.
> > > Now, I want to solve an elasticity problem on a unit square
> wherein
> > I want to
> > > apply a displacement in y direction on top face and have a
> pin and
> > roller
> > > support at lower left and right node respectively.
> > > I tried to do this as follows:
> > > 1. I used the constraint object to apply displacement in y
> > direction on top face.
> > > 2. I created a std::map boundary_values object to enforce a
> pin and
> > roller
> > > support bc at lower left and right node respectively.
> > > I took a look at step79. They seem to have similar dirichlet
> bc at
> > the bottom
> > > but apply a neumann bc at the top. I followed a similar
> procedure
> > to have a
> > > pin and roller bc at lower left and right node
> respectively(using the
> > > setup_boundary_values class as they have done).
> > >
> > >
> > > My code throws the following error:
> > > An error occurred in line <324> of file
> > >
> >
>
> </home/wasim/dealii-candi/deal.II-v9.4.0/include/deal.II/dofs/dof_accessor.templates.h>
> >
> > > in function
> > > static void
> > >
> >
>
> dealii::internal::DoFAccessorImplementation::Implementation::process_dof_index(const
> >
> > > dealii::DoFHandler<dim, spacedim>&, unsigned int, unsigned
> int,
> > unsigned int,
> > > unsigned int, const std::integral_constant<int, structdim>&,
> > GlobalIndexType&,
> > > const DoFPProcessor&) [with int dim = 2; int spacedim = 2; int
> > structdim = 0;
> > > GlobalIndexType = unsigned int; DoFPProcessor =
> > >
> >
> dealii::internal::DoFAccessorImplementation::Implementation::get_dof_index<2,
> >
> > > 2, 0>::<lambda(const auto:9&, auto:10&)>]
> > > The violated condition was:
> > >
> >
> ::dealii::deal_II_exceptions::internals::compare_less_than(obj_level,
> > > dof_handler.object_dof_indices.size())
> > > Additional information:
> > > Index 0 is not in the half-open range [0,0). In the
> current
> > case, this
> > > half-open range is in fact empty, suggesting that you are
> > accessing an
> > > element of an empty collection such as a vector that has
> not
> > been set
> > > to the correct size.
> > >
> > > Stacktrace:
> > > -----------
> > > #0 ./step-103: void
> > >
> >
>
> dealii::internal::DoFAccessorImplementation::Implementation::process_dof_index<2,
> >
> > > 2, 0, unsigned int,
> > >
> >
> dealii::internal::DoFAccessorImplementation::Implementation::get_dof_index<2,
> >
> > > 2, 0>(dealii::DoFHandler<2, 2> const&, unsigned int, unsigned
> int,
> > unsigned
> > > int, unsigned int, std::integral_constant<int, 0>
> > const&)::{lambda(auto:1
> > > const&, auto:2&)#1}>(dealii::DoFHandler<2, 2> const&,
> unsigned int,
> > unsigned
> > > int, unsigned int, unsigned int, std::integral_constant<int,
> 0>
> > const&,
> > > unsigned int&,
> > >
> >
> dealii::internal::DoFAccessorImplementation::Implementation::get_dof_index<2,
> >
> > > 2, 0>(dealii::DoFHandler<2, 2> const&, unsigned int, unsigned
> int,
> > unsigned
> > > int, unsigned int, std::integral_constant<int, 0>
> > const&)::{lambda(auto:1
> > > const&, auto:2&)#1} const&)
> > > #1 ./step-103: unsigned int
> > >
> >
> dealii::internal::DoFAccessorImplementation::Implementation::get_dof_index<2,
> >
> > > 2, 0>(dealii::DoFHandler<2, 2> const&, unsigned int, unsigned
> int,
> > unsigned
> > > int, unsigned int, std::integral_constant<int, 0> const&)
> > > #2 ./step-103: dealii::DoFAccessor<2, 2, 2,
> > false>::vertex_dof_index(unsigned
> > > int, unsigned int, unsigned int) const
> > > #3 ./step-103:
> step103::ElasticProblem::setup_boundary_values()
> > > #4 ./step-103: step103::ElasticProblem::run()
> > > #5 ./step-103: main
> > > --------------------------------------------------------
> > >
> > > make[3]: *** [CMakeFiles/run.dir/build.make:71:
> CMakeFiles/run]
> > Aborted (core
> > > dumped)
> > > make[2]: *** [CMakeFiles/Makefile2:116:
> CMakeFiles/run.dir/all] Error 2
> > > make[1]: *** [CMakeFiles/Makefile2:123:
> CMakeFiles/run.dir/rule]
> > Error 2
> > > make: *** [Makefile:137: run] Error 2
> > > Is it because I am applying Dirichlet bc using two objects,
> > constraints and
> > > boundary_values?
> > >
> > >
> > > Thank you
> > >
> > >
> > >
> > > On Mon, Oct 10, 2022 at 7:28 PM Wolfgang Bangerth
> > <bang...@colostate.edu
> > > <mailto:bang...@colostate.edu>> wrote:
> > >
> > > On 10/10/22 07:42, Wasim Niyaz Munshi ce21d400 wrote:
> > > > I am trying to solve the elasticity equation on a
> square domain
> > > (similar to
> > > > step 8).
> > > > For the patch test I am using just one element.
> > > > I am having problems with the application of boundary
> > conditions.
> > > > I want to fix the lower left node in both x and y, and
> also
> > fix the lower
> > > > right node in y.
> > > > The lower right node is free to move in x.
> > > > The problem I am facing is that both these nodes are
> on the
> > same face,
> > > and I
> > > > do not know how to specify different values of x
> > displacement for the 2
> > > nodes
> > > > of the same face.
> > > >
> > > > Is there a way to set boundary id to a node rather
> than to a
> > face?
> > >
> > > No -- principally because from a mathematical
> perspective, you
> > can only set
> > > boundary indicators on parts of the boundary that have
> (d-1)
> > dimensional
> > > measure larger than zero. Vertices do not satisfy this.
> > >
> > > But it is a common thing to do anyway. You might want to
> look
> > at the step-79
> > > that does something similar.
> > >
> > > Best
> > > W>
> > >
> > >
> > > --
> > >
> >
> ------------------------------------------------------------------------
> > > Wolfgang Bangerth email: bang...@colostate.edu
> > > <mailto:bang...@colostate.edu>
> > > www:
> > http://www.math.colostate.edu/~bangerth/
> > <http://www.math.colostate.edu/~bangerth/>
> > > <http://www.math.colostate.edu/~bangerth/
> > <http://www.math.colostate.edu/~bangerth/>>
> > >
> > > --
> > > The deal.II project is located at http://www.dealii.org/
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> > > ---
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> >>.
> >
> >
> > --
> >
> ------------------------------------------------------------------------
> > Wolfgang Bangerth email: bang...@colostate.edu
> > www:
> > http://www.math.colostate.edu/~bangerth/
> > <http://www.math.colostate.edu/~bangerth/>
> >
> > --
> > The deal.II project is located at http://www.dealii.org/
> > <
> https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.dealii.org%2F&data=05%7C01%7CWolfgang.Bangerth%40colostate.edu%7C88f4621afd9f400f143408daae99a1fc%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638014272188077928%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Df6hcuAHc4TAFZBsoz0kbJxoihHH3%2B3Y0X6rxhJUmzY%3D&reserved=0
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> >
> > ---
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> >.
> >
> > --
> > The deal.II project is located at http://www.dealii.org/
> > <
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> >
> > ---
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> > <
> https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgroups.google.com%2Fd%2Fmsgid%2Fdealii%2F2fb027e7-801a-4962-b5d4-496c21be1e10n%2540googlegroups.com%3Futm_medium%3Demail%26utm_source%3Dfooter&data=05%7C01%7CWolfgang.Bangerth%40colostate.edu%7C88f4621afd9f400f143408daae99a1fc%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638014272188077928%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Z5r9lpGKUadzH92ScHuxdMNYe0Xjph5qmZP6Mm1nXi0%3D&reserved=0
> >.
>
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth email: bange...@colostate.edu
> www: http://www.math.colostate.edu/~bangerth/
>
> --
> 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 to a topic in the
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> https://groups.google.com/d/msgid/dealii/fd029990-33ef-eb71-52a5-158a652dda97%40colostate.edu
> .
>
--
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
---
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