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Visar resultat 11 - 15 av 86 avhandlingar som matchar ovanstående sökkriterier.

  1. 11. A Numerical Study of the Fluid Dynamics of Bubbling Fluidized Beds

    Författare :Hans Enwald; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; validation; two-phase solver; multiblock; statistical bubble parameters; parallelization; bed expansion ratio; bubbling fluidized bed; two-fluid model;

    Sammanfattning : The two-fluid model was evaluated as a tool for predicting local flow behaviour in bubbling fluidized beds. A review is given of the two-fluid model approach for simulation of the flow in bubbling fluidized beds. LÄS MER

  3. 12. Development and Implementation of Methods in Theoretical Chemistry

    Författare :Jesper Wisborg Krogh; Beräkningskemi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; UO2; Electrostatic potential; Photo dissociation; Nuclear Quadrupole Moment; Relativity; RASSCF; LoProp; Method development; Parallelization; Sn; Bromoiodomethane; Theoretical chemistry; quantum chemistry; Teoretisk kemi; kvantkemi;

    Sammanfattning : The method development research in the field of theoretical chemistry is the never ending quest for methods that are faster, gives more accurate results, and expands the possibilities. The work in this thesis is no exception to that statement. LÄS MER

  4. 13. Domain Decomposition and Preconditioned Iterative Methods for the Helmholtz Equation

    Författare :Elisabeth Larsson; Kurt Otto; Bengt Fornberg; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Helmholtz equation; domain decomposition; preconditioned iterative method; fast transforms; parallelization; Numerical Analysis; Numerisk analys;

    Sammanfattning : New preconditioned iterative solution methods for the Helmholtz equation are constructed. To evaluate the performance of the methods, two-dimensional problems with a waveguide geometry are used as model problems. Second- and fourth-order accurate finite difference discretizations are used. LÄS MER

  5. 14. Hybrid Time-Domain Methods and Wire Models for Computational Electromagnetics

    Författare :Gunnar Ledfelt; KTH; []
    Nyckelord :FD-TD; Finite element; Finite volume; Hybrid methods; Thin wire subcell models; Visualization; Parallelization;

    Sammanfattning : .... LÄS MER

  7. 15. Operational Semantics for PLEX : A Basis for Safe Parallelization

    Författare :Johan Lindhult; Björn Lisper; Nordlander Johan; Mälardalens högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Computer science; Datavetenskap; Datavetenskap;

    Sammanfattning : The emerge of multi-core computers implies a major challenge for existing software. Due to simpler cores, the applications will face decreased performance if not executed in parallel. The problem is that much of the software is sequential.Central parts of the AXE telephone exchange system from Ericsson is programmed in the language PLEX. LÄS MER