*** 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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The deal.II project is located at http://www.dealii.org/
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