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, <[email protected]>
    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
        <[email protected]
         > <mailto:[email protected]>> 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: [email protected]
         >     <mailto:[email protected]>
         >                                  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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-- ------------------------------------------------------------------------
        Wolfgang Bangerth          email: [email protected]
                                     www:
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        <http://www.math.colostate.edu/~bangerth/>

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--
------------------------------------------------------------------------
Wolfgang Bangerth          email:                 [email protected]
                           www: http://www.math.colostate.edu/~bangerth/

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