Sökning: "Poisson Solver"

Hittade 5 uppsatser innehållade orden Poisson Solver.

  1. 1. Leveraging Posits for the Conjugate Gradient Linear Solver on an Application-Level RISC-V Core

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :David Mallasén Quintana; [2022]
    Nyckelord :Computer Arithmetic; Conjugate Gradient; Posit; IEEE-754; Floating Point; High-Performance Computing; RISC-V; Datoraritmetik; Konjugerad Gradient; Posit; IEEE-754; Flytande Punkt; Högpresterande Beräkningar; RISC-V;

    Sammanfattning : Emerging floating-point arithmetics provide a way to optimize the execution of computationally-intensive algorithms. This is the case with scientific computational kernels such as the Conjugate Gradient (CG) linear solver. Exploring new arithmetics is of paramount importance to maximize the accuracy and timing performance of these algorithms. LÄS MER

  3. 2. Towards an Efficient Spectral Element Solver for Poisson’s Equation on Heterogeneous Platforms

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Jonas Nylund; [2022]
    Nyckelord :Neko; CUDA; Heterogeneous hardware; GPU; Gather-Scatter; HPC; CFD; Neko; CUDA; Heterogena plattformar; GPU; Gather-Scatter; Högprestandabe-räkningar; Beräkningsströmningsdynamik;

    Sammanfattning : Neko is a project at KTH to refactor the widely used fluid dynamics solver Nek5000 to support modern hardware. Many aspects of the solver need adapting for use on GPUs, and one such part is the main communication kernel, the Gather-Scatter (GS) routine. To avoid race conditions in the kernel, atomic operations are used, which can be inefficient. LÄS MER

  4. 3. A Physically Based Pipeline for Real-Time Simulation and Rendering of Realistic Fire and Smoke

    Kandidat-uppsats, Stockholms universitet/Numerisk analys och datalogi (NADA)

    Författare :Yiyang He; [2018]
    Nyckelord :Visualization; Physically Based; Pipeline; Real-Time; Dynamic Simulation; Combustion; Fire; Explosion; Smoke; Thick Smoke; Computer Graphics; PDE; Numerical Methods; Grid Based; Navier-Stokes Equation; Imcompressible Fluid; Radiative Transfer Equation; RTE; Volumetric Illumination; Volumetric Rendering; Volumetric Global Illumination; Distant Light Source; Volumetric Global Shadow; Local Shadow Approximation; Black-body Radiation; Poisson Solver; Spectroscopy; Fire Color; Color Reproduction; Tone Mapping; Color Temperature; Color Matching Function; Tristimulus; CIE Standard Observer; Color Space; XYZ; RGB; GPU; GPGPU; ComputeShader; DirectX 12; Unity; C#;

    Sammanfattning : With the rapidly growing computational power of modern computers, physically based rendering has found its way into real world applications. Real-time simulations and renderings of fire and smoke had become one major research interest in modern video game industry, and will continue being one important research direction in computer graphics. LÄS MER

  5. 4. Algebraic multigrid for a mass-consistent wind model, the Nordic Urban Dispersion model

    Master-uppsats, Umeå universitet/Institutionen för fysik

    Författare :Markus Pogulis; [2015]
    Nyckelord :Mass-consistent model; urban environment; numerical method; algebraic multigrid;

    Sammanfattning : In preparation for, and for decision support during, CBRN (chemical, biological, radiological and nuclear) emergencies it is essential to know how such an event would turn out, so that one can prepare a possible evacuation. Afterwards it might be good to know how to backtrack and see what caused the emergency, and in the case of e.g. LÄS MER

  7. 5. Characterization of AlGaN HEMT structures

    Uppsats för yrkesexamina på grundnivå, Institutionen för fysik, kemi och biologi

    Författare :Anders Lundskog; [2007]
    Nyckelord :HEMT; Hot-Wall MOCVD; GaN; AlGaN; AlN exclusionlayer; Double heterojunction; 1D Poisson-Schrödinger;

    Sammanfattning : During the last decade, AlGaN High Electron Mobility Transistors (HEMTs) have been intensively studied because their fundamental electrical properties make them attractive for highpower microwave device applications. Despite much progress, AlGaN HEMTs are far from fully understood and judged by the number of published papers the understanding of advanced structures is even poorer. LÄS MER