Essays about: "Absorbing boundary conditions"

Found 5 essays containing the words Absorbing boundary conditions.

  1. 1. Dirichlet-to-Neumann maps and Nonlinear eigenvalue problems

    University essay from KTH/Skolan för teknikvetenskap (SCI)

    Author : Tindra Jernström; Anna Öhman; [2023]
    Keywords : Dirichlet-to-Neumann maps; Nonlinear eigenvalue problems; Absorbing boundary conditions;

    Abstract : Differential equations arise frequently in modeling of physical systems, often resulting in linear eigenvalue problems. However, when dealing with large physical domains, solving such problems can be computationally expensive. READ MORE

  3. 2. Numerical simulation of acoustic wave propagation with a focus on modeling sediment layers and large domains

    University essay from Uppsala universitet/Avdelningen för beräkningsvetenskap

    Author : Elias Estensen; [2022]
    Keywords : Helmholtz; wave equation; acoustics; ocean acoustics; numerical analysis; computational science; finite differences; summation by parts; sbp; waveholtz; cylindrical coordinates; sediment layers; interface; super-grid; super grid; absorbing layer; Helmholtz; vågekvationen; akustik; undervattensakustik; numerisk analys; beräkningsvetenskap; finita differenser; summation by parts; sbp; cylindriska koordinater; waveholtz; sedimentskikt; interface; super-grid; absorberande lager;

    Abstract : In this report, we study how finite differences can be used to simulate acoustic wave propagation originating from a point source in the ocean using the Helmholtz equation. How to model sediment layers and the vast size of the ocean is studied in particular. READ MORE

  4. 3. CFD Simulation of a Fin-Tube Evaporator under icing

    University essay from Linköpings universitet/Mekanisk värmeteori och strömningslära

    Author : Abhay Mahesh Hervatte; [2021]
    Keywords : CFD; Refrigeration; HVAC; Evaporator; Thermodynamics; Icing;

    Abstract : The study involves development of a methodology to simulate a fin-tube evaporator under icing conditions using CFD in Ansys® Academic Fluent 2021R1. It aims to build on previous studies performed on heat pumps. It was performed by Abhay M. Hervatte in collaboration with Bosch Thermoteknik AB, Tranås, SE during the spring term of the year 2021. READ MORE

  5. 4. Evaluation, adaption and implementations of Perfectly Matched Layers in COMSOL Multiphysics

    University essay from KTH/Numerisk analys, NA

    Author : Simon Erlandsson; [2020]
    Keywords : Applied mathematics; computational mathematics; finite element method; FEM; perfectly matched layer; PML; COMSOL; Tillämpad matematik; beräkningsteknik; finita elementmetoden; FEM; PML; COMSOL;

    Abstract : Perfectly matched layer (PML) is a commonly used method of absorbing waves at a computational boundary for partial differential equation (PDE) problems. In this thesis, methods for improving the usability of implementations in Comsol Multiphysics is addressed. READ MORE

  6. 5. Performance Comparison Between FEM and DG with Application in Electromagnetics

    University essay from Uppsala universitet/Avdelningen för beräkningsvetenskap

    Author : Oscar Möller; [2016]
    Keywords : DGFEM; FEM;

    Abstract : Military aircraft have strict requirements to show a low radar signature within different aspect angels and frequency bands. The Finite Difference method and Finite Element method are used by Saab to determine the radar signature from different objects, but the methods  suffer from a few limitations. READ MORE