On 2/8/21 9:10 AM, Karthi wrote:
I want to solve a linear elasticity for unknowns displacement (u) and stress
(\sigma) simultaneously using a mixed formulation. I have_attached_ the
revenant strong and weak form of the problem. For u is the discretized using
Lagrange elements and \sigma using Raviart-Thomas elements.
Step-20 has an example using mixed formulation, were RT elements were used for
velocity which has dim components. Whereas in my case were RT elements would
have dim x dim components for stress. How do I go about it?
In analogy to step-8, where you create an FESystem that contains several
scalar finite elements, you will want to create an FESystem that contains
several FE_RaviartThomas elements.
There is also FEValuesExtractors::Tensor that allows you to group components
into tensors, in the same way as you can do for vectors.
Best
W.
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Wolfgang Bangerth email: [email protected]
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