On 6/20/24 22:09, kai huang wrote:
I am working on some problems involving eigenvalues and eigenvectors.
I am having some issues when assembling the stiffness matrix. Generally,
there are three methods to handle Dirichlet boundary conditions, such as the
penalty method (multiplying by a
Dear all,
I am working on some problems involving eigenvalues and eigenvectors.
I am having some issues when assembling the stiffness matrix. Generally,
there are three methods to handle Dirichlet boundary conditions, such as
the penalty method (multiplying by a large number); setting the
Jean-Paul is right. Most likely you don't adjust the quadrature order which
breaks LU factorization of the mass matrix, used by default for Generalized
Hermitian Eigenvalue Problem. Essentially your mass matrix is not positive
definite anymore.
Regards,
Denis
--
The deal.II project is locate
Dear Nitish,
I’m not familiar with this tutorial and I don’t have much to suggest, but I
have one basic question: When increasing the polynomial order of the finite
element, do you increase the corresponding quadrature order as well?
Regards,
Jean-Paul
> On 19 Sep 2017, at 14:53, Nitish Anand
Hey,
I wish to solve an eigenvalue problem for a rotating disk and to understand
more about the implementation I looked into the step-36 example.
Unfortunately, when I increase the degrees of freedom in the code (changing
line 70 to fe(3) or fe(2)) I get the following error.
Number of acti
