Sökning: "a posteriori error estimates"
Visar resultat 16 - 20 av 35 avhandlingar innehållade orden a posteriori error estimates.
16. Adaptive finite element methods for parameter estimation problems in partial differential equations
Sammanfattning : Physical and chemical phenomena are often described by a system of partial di®erential equations. These equations usually involve unknown parameters, which cannot be measured directly but which can be adjusted to make the model predictions match the observed data. LÄS MER
17. Numerical Complexity Analysis of Weak Approximation of Stochastic Differential Equations
Sammanfattning : The thesis consists of four papers on numerical complexityanalysis of weak approximation of ordinary and partialstochastic differential equations, including illustrativenumerical examples. Here by numerical complexity we mean thecomputational work needed by a numerical method to solve aproblem with a given accuracy. LÄS MER
18. Adaptive Algorithms and High Order Stabilization for Finite Element Computation of Turbulent Compressible Flow
Sammanfattning : This work develops finite element methods with high order stabilization, and robust and efficient adaptive algorithms for Large Eddy Simulation of turbulent compressible flows. The equations are approximated by continuous piecewise linear functions in space, and the time discretization is done in implicit/explicit fashion: the second order Crank-Nicholson method and third/fourth order explicit Runge-Kutta methods. LÄS MER
19. Weak approximation of ItÔ stochastic differential equations and related adaptive algorithms
Sammanfattning : .... LÄS MER
20. Adaptive variational multiscale methods
Sammanfattning : In this thesis we present a new adaptive multiscale method for solving elliptic partial differential equations. The method is based on numerical solution of decoupled local fine scale problems on patches. LÄS MER