GRK-Kolloquium, Prof. Dr. Lubomir Banas

Feb 10
10-02-2023 15:15 Uhr bis 16:15 Uhr

Robust a posteriori estimates for the stochastic Cahn-Hilliard equation

I will discuss the derivation a posteriori error estimates for a fully discrete
finite element approximation of the stochastic Cahn-Hilliard equation.
The a posteriori bound is obtained by a splitting of the equation into a linear
stochastic partial differential equation (SPDE)
and a nonlinear random partial differential equation (RPDE) and estimating the
errors on suitable probability subsets.
The resulting estimate is robust with respect to the interfacial width parameter
and is computable since it involves the discrete principal eigenvalue of a
linearized (stochastic) Cahn-Hilliard operator.
Furthermore, the estimate is robust with respect to topological changes as well
as the intensity of the stochastic noise.
We provide numerical simulations to demonstrate the practicability of the
proposed adaptive algorithm.