DOF Renumbering & Creation of Block Matrices

[Prashant Singh]

Dear All,

I am trying to solve an inverse problem in elasticity, where all dofs are grouped into three categories. I have the below mentioned questions:

  1. Is it possible to renumber the dofs as per their group, ie: dofs corresponding to a certain group should be clustered together.

  2. After I have created the assembly matrix, I need to implement a block-wise solver scheme. To do this, I need an access to a 3*3 block matrix (as per the 3 individual groups)  which results from reorganisation of the original stiffness matrix. Please provide your suggestions of how to do so efficiently.

I am a novice to deal.ii, and was not able to find the answers in deal.ii documentation. So, requesting your kind help.

Thank you.

Regards

Prashant

[Wolfgang Bangerth]

Take a look at step-22 for example (many other tutorial programs do similar
things), where we split the degrees of freedom in the Stokes equation based on
whether they are velocities or pressures.

Best
WB


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Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/

[Prashant Singh]

Dear Bangerth,

Thank you very much.

Regards

Prashant