Sökning: "Karl Hörnell"

Hittade 2 avhandlingar innehållade orden Karl Hörnell.

1. 1. Parameter-free Krylov subspace iteration methods for the Euler and Navier–Stokes equations

   Författare :Karl Hörnell; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Numerical Analysis; Numerisk analys;

   Sammanfattning : .... LÄS MER

3. 2. Runge–Kutta Time Step Selection for Flow Problems

   Författare :Karl Hörnell; Per Lötstedt; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Runge-Kutta; stepsize selection; optimization; flow problems; numerical analysis; Numerical Analysis; Numerisk analys;

   Sammanfattning : Optimality is studied for Runge-Kutta iteration for solving steady-state and time dependent flow problems. For the former type an algorithm for determining locally optimal time steps is developed, based on the fact that the squared norm of the residual produced by an m-stage scheme is a 2m-degree polynomial, the coefficients of which can be computed from scalar products of Krylov subspace vectors. LÄS MER