Sökning: "numerical methods"

Visar resultat 16 - 20 av 1425 avhandlingar innehållade orden numerical methods.

  1. 16. Numerical Methods for Aerodynamic Shape Optimization

    Författare :Olivier Amoignon; Martin Berggren; Per Lötstedt; Olivier Pironneau; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Computational Fluid Dynamics; shape optimization; adjoint equations; edge-based finite-volume method; moving mesh adaptation; radial basis functions; inviscid compressible flow; transition control; Numerical Analysis; Numerisk analys;

    Sammanfattning : Gradient-based aerodynamic shape optimization, based on Computational Fluid Dynamics analysis of the flow, is a method that can automatically improve designs of aircraft components. The prospect is to reduce a cost function that reflects aerodynamic performances. LÄS MER

  3. 17. Numerical Solution Methods in Stochastic Chemical Kinetics

    Författare :Stefan Engblom; Per Lötstedt; Wilhelm Huisinga; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stochastic models; chemical master equation; mesoscopic kinetics; Markov property; jump process; moment closure problem; spectral-Galerkin method; high dimensional problem; hybrid methods; time-parallel; homogenization; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Sammanfattning : This study is concerned with the numerical solution of certain stochastic models of chemical reactions. Such descriptions have been shown to be useful tools when studying biochemical processes inside living cells where classical deterministic rate equations fail to reproduce actual behavior. LÄS MER

  4. 18. Numerical Methods for Molecular Dynamics with Nearly Crossing Potential Surfaces

    Författare :Ashraful Kadir; Anders Szepessy; Emanuel Rubensson; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Numerical Methods; Molecular Dynamics; Nearly Crossing Potential Surfaces; Error Estimation; Adaptive Algorithm; Tillämpad matematik och beräkningsmatematik; Applied and Computational Mathematics;

    Sammanfattning : This thesis consists of four papers that concern error estimates for the Born-Oppenheimer molecular dynamics, and adaptive algorithms for the Car-Parrinello and Ehrenfest molecular dynamics.In Paper I, we study error estimates for the Born-Oppenheimer molecular dynamics with nearly crossing potential surfaces. LÄS MER

  5. 19. Heating the Early Universe : Numerical Methods and Their Analysis

    Författare :Kai Yan Lee; Garrelt Mellema; Dominique Aubert; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cosmology; Astronomy; astronomi;

    Sammanfattning : During the epoch when the first collapsed structures formed (6.... LÄS MER

  7. 20. Development of Numerical Methods for Accurate and Efficient Scale-Resolving Simulations

    Författare :Magnus Carlsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High-order gradient reconstruction; Hybrid RANS-LES; Scale-resolving simulation; Synthetic Turbulence; Numerical methods; Turbulence modelling;

    Sammanfattning : Hybrid RANS (Reynolds-Averaged Navier-Stokes)-LES (Large-Eddy Simulation) techniques are considered to be sufficiently accurate and computationally affordable for the aeronautical industry. Scale-resolving simulations is a powerful tool that can accurately predict complex unsteady compressible high-Reynolds-number turbulent flows, as often encountered aeronautical applications. LÄS MER