Setting boundary id's for points instead of faces

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Wasim Niyaz Munshi ce21d400

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Oct 10, 2022, 9:42:50 AM10/10/22

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Hi everyone.

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?

Thank you

Wolfgang Bangerth

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Oct 10, 2022, 9:58:27 AM10/10/22

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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>

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Wasim Niyaz Munshi ce21d400

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Oct 11, 2022, 7:16:40 AM10/11/22

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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

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Wolfgang Bangerth

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Oct 11, 2022, 9:33:17 AM10/11/22

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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:

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Wasim Niyaz Munshi ce21d400

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Oct 12, 2022, 12:29:35 PM10/12/22

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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

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Wasim Niyaz Munshi ce21d400

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Oct 15, 2022, 6:40:06 AM10/15/22

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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

Wolfgang Bangerth

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Oct 17, 2022, 12:16:05 AM10/17/22

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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.

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Wasim Niyaz Munshi ce21d400

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Oct 17, 2022, 2:39:50 AM10/17/22

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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

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Wolfgang Bangerth

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Oct 17, 2022, 10:01:11 AM10/17/22

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Wasim,
I don't know which lines you specifically mean where you ask what they do, but
it seems like you're down to basic questions about C++ for which there may be
other forums better suited?

Best
W.

On 10/17/22 00:39, Wasim Niyaz Munshi ce21d400 wrote:
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> */*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;*
> *
> *

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> > >
> > > --
> > > 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%7Cfe772b5bd3c14f770a3308dab00a6518%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638015855959925334%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=2uEuxdaA5F1F6Z9rbyl1YTiieyjohss%2Bji9T9ZlTYjk%3D&reserved=0>
> >
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> > >
> >
> <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.dealii.org%2F&data=05%7C01%7CWolfgang.Bangerth%40colostate.edu%7C861d8e11d32747990c3308daab7a1301%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638010838048599291%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=GczFY9xgCuNhKCygAdQqZMzE3pQtDVR%2BJunoKQQyndQ%3D&reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.dealii.org%2F&data=05%7C01%7CWolfgang.Bangerth%40colostate.edu%7Cfe772b5bd3c14f770a3308dab00a6518%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638015855959925334%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=2uEuxdaA5F1F6Z9rbyl1YTiieyjohss%2Bji9T9ZlTYjk%3D&reserved=0> <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%7C638014272187765453%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=HKrd0Er%2FD2wCvZN8%2FLOeOoseRXjRtK4AMZLHrySgEpM%3D&reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.dealii.org%2F&data=05%7C01%7CWolfgang.Bangerth%40colostate.edu%7Cfe772b5bd3c14f770a3308dab00a6518%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638015855959925334%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=2uEuxdaA5F1F6Z9rbyl1YTiieyjohss%2Bji9T9ZlTYjk%3D&reserved=0>>>

> > > For mailing list/forum options, see
> > > https://groups.google.com/d/forum/dealii?hl=en

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> >
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> > >
> >
> <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgroups.google.com%2Fd%2Fforum%2Fdealii%3Fhl%3Den&data=05%7C01%7CWolfgang.Bangerth%40colostate.edu%7C861d8e11d32747990c3308daab7a1301%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638010838048755540%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Al7MfSTwuuRHdmniebbLxp4ugBaX1ddbBdlldSxuX5o%3D&reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgroups.google.com%2Fd%2Fforum%2Fdealii%3Fhl%3Den&data=05%7C01%7CWolfgang.Bangerth%40colostate.edu%7Cfe772b5bd3c14f770a3308dab00a6518%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638015855959925334%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=gG1fJBCtS%2B1dX92wLzl51ODI5WRPGJFvXAOMlVt3OCI%3D&reserved=0> <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgroups.google.com%2Fd%2Fforum%2Fdealii%3Fhl%3Den&data=05%7C01%7CWolfgang.Bangerth%40colostate.edu%7C88f4621afd9f400f143408daae99a1fc%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638014272187765453%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=YEUpVbdmARp4jfoCOULpSO0cErkm%2FHefxiBSekhB7Xw%3D&reserved=0 <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgroups.google.com%2Fd%2Fforum%2Fdealii%3Fhl%3Den&data=05%7C01%7CWolfgang.Bangerth%40colostate.edu%7Cfe772b5bd3c14f770a3308dab00a6518%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C638015855959925334%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=gG1fJBCtS%2B1dX92wLzl51ODI5WRPGJFvXAOMlVt3OCI%3D&reserved=0>>>

> > > ---
> > > You received this message because you are subscribed to
> a topic
> > in the
> > > Google Groups "deal.II User Group" group.
> > > To unsubscribe from this topic, visit
> > >
> https://groups.google.com/d/topic/dealii/jI31ro8W_Cg/unsubscribe

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> > >
> >
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> > > To unsubscribe from this group and all its topics, send
> an email to
> > > dealii+un...@googlegroups.com

> <mailto:dealii%2Bun...@googlegroups.com>
> > > <mailto:dealii%2Bunsu...@googlegroups.com
> <mailto:dealii%252Bunsu...@googlegroups.com>>.

> > > To view this discussion on the web visit
> > >
> >
> https://groups.google.com/d/msgid/dealii/64772c85-044f-3492-5895-b1d6ac398b0f%40colostate.edu

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> >
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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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> > > ---
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> >
> >
> > --
> >
> ------------------------------------------------------------------------
> > 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/

> > 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
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> > To unsubscribe from this group and all its topics, send an email to

> > dealii+un...@googlegroups.com <mailto:dealii%2Bun...@googlegroups.com>.

> > To view this discussion on the web visit
> >

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> >
> > --
> > 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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> <mailto:dealii%2Bunsu...@googlegroups.com>
> > <mailto:dealii+un...@googlegroups.com

> <mailto:dealii%2Bunsu...@googlegroups.com>>.
> > To view this discussion on the web visit
> >

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> Wolfgang Bangerth email: bang...@colostate.edu

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> www: http://www.math.colostate.edu/~bangerth/
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