> Are you using the homogeneous or the heterogeneous constraint
> functions when constraining your system of equations? Often we solve
> for a delta between two solutions (Newton steps, time steps with fixed
> BC values, etc) rather than directly solving for the constrained
> solution, so we have
On Sun, 7 Jan 2018, Renato Poli wrote:
I am struggling with a Dirichlet boundary condition setting the
boundary to zero, instead of the value I impose (3.e7). Previously, I
was using the penalty method, and it was working fine.
Is there any known corner condition where the DirichletBoundary wo
Hi
I am struggling with a Dirichlet boundary condition setting the
boundary to zero, instead of the value I impose (3.e7). Previously, I
was using the penalty method, and it was working fine.
Is there any known corner condition where the DirichletBoundary would
drive the variable to zero? Any ide
Thanks to David and John for your hints. I need to further digest it.
--Junchao Zhang
On Wed, Jan 13, 2016 at 4:33 PM, John Peterson wrote:
>
>
> On Wed, Jan 13, 2016 at 3:23 PM, Junchao Zhang
> wrote:
>
>> Hello,
>> I tried to follow the textbook to write weak forms of PDEs with Dirichlet
>>
On Wed, Jan 13, 2016 at 3:23 PM, Junchao Zhang
wrote:
> Hello,
> I tried to follow the textbook to write weak forms of PDEs with Dirichlet
> boundary conditions like some libmesh examples. The textbook usually lets u
> = 0 on boundary, making it easy to understand why the boundary term
> vanishes
Hello,
I tried to follow the textbook to write weak forms of PDEs with Dirichlet
boundary conditions like some libmesh examples. The textbook usually lets u
= 0 on boundary, making it easy to understand why the boundary term
vanishes in weak form. But when u is not zero on boundary, I found libmesh
boundary side (y=y_max) is supposed to deform evenly
>along both directions of the x-axis. However, in both figures, the
>deformation occurs mainly in one direction.
> Thanks very much for your help. Cheers, Dafang Date: Tue, 4 Mar 2014
> 18:47:51 -0500 From: David Knezevic
&g
along both directions of the x-axis. However, in both figures, the
deformation occurs mainly in one direction.
Thanks very much for your help. Cheers, Dafang Date: Tue, 4 Mar 2014
18:47:51 -0500 From: David Knezevic
Subject: Re: [Libmesh-users] Dirichlet Boundary Condition on Part of the
Hi Dafang,
I've done this a lot for elasticity problems, and haven't had any
problems with it.
If you can send through an example that illustrates what is happening
(e.g. a modified version of systems_of_equations_ex6), I'd be happy to
have a look.
David
On 03/04/2014 06:08 PM, Dafang Wang
Hi,
The Libmesh Examples tell how to use the DirichletBoundary class to
constrain all the variables in a system, but I am not sure how to apply
zero Dirichlet BC to PART of the field variables in a system. I am
solving a simple 3D elastic problem and I want to fix a boundary in the
y direction
Thanks, David.
I will be able to do that. I also have a patch coming for some work on
sensitivity analysis.
I figured that the enforce_constraints_exactly method is what provides the
capability for other systems for application of Dirichlet bcs. I should be
able to get the dof information from t
Hi Manav,
It would be great to update CondensedEigenSystem in the way you propose.
I originally implemented that class since I needed it for some of the
Reduced Basis code, and it pre-dates the DirichletBoundary stuff.
Current the user has to initialize the list of Dirichlet dofs in
CondensedE
Hi,
I am trying to understand the application of DirichletBoundary
constraints in the system solution.
For a system, say LinearImplicitSystem or NonlinearImplicitSystem, once
the user calls solve, at what stage (and which routine) in this function
call are the Dirichlet boundary condition
imple states,independent of their specific history."
Herbert Callen . Thermodynamics and an Introduction to Thermostatics.
- Original Message -
From: "Paul T. Bauman"
To: "Subramanya Gautam Sadasiva"
Cc: "libmesh-users"
Sent: Tuesday, March 19, 2013
On Tue, Mar 19, 2013 at 9:37 PM, Subramanya Gautam Sadasiva <
[email protected]> wrote:
> Hi,
> I have a small question about applying boundary conditions using the
> Dirichlet Boundary Conditions while solving a problem with
> lagrangian_vector elements. How do I constrain only one of the compo
Hi,
I have a small question about applying boundary conditions using the Dirichlet
Boundary Conditions while solving a problem with lagrangian_vector elements.
How do I constrain only one of the components?
Subramanya Sadasiva
"But memory eventually fades. Turbulences damp out, internal stra
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