Essays about: "Advection and Diffusion"

Showing result 1 - 5 of 18 essays containing the words Advection and Diffusion.

  1. 1. Solving the incompressible Navier-Stokes equations in 3-D to model gas flow in a room

    University essay from Uppsala universitet/Avdelningen för beräkningsvetenskap

    Author : Fredrik Malmström; [2024]
    Keywords : ;

    Abstract : The thesis proposes to model the flow of gases in a room by solving the incompressible Navier-Stokes equations in three dimensions. The transportationof scalars such as temperature and concentration of CO2 is modeled by solving the advection-diffusion equation, and the effects of temperature on thevelocity is accounted for by employing the Boussinesq approximation. READ MORE

  3. 2. Optimization of the Runge-Kutta Method for the Steady State Advection-Diffusion Equation

    University essay from Lunds universitet/Matematik (naturvetenskapliga fakulteten); Lunds universitet/Matematikcentrum

    Author : Paulina Ibek; [2023]
    Keywords : Mathematics and Statistics;

    Abstract : .... READ MORE

  4. 3. Investigating the Fluxes of Radio-Cesium (137Cs) in Sweden : Investigating the Fluxes of Radio-Cesium (137Cs) in Sweden

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Hammad Masood; [2022]
    Keywords : Chernobyl incident; Sweden; radio-cesium; contamination; terrestrial environment; quatic environment;

    Abstract : Technological advancement and the quest for power have gradually contaminated our environment, as industrialization, agriculture, and nuclear activities progressed. In the year 1986, a terrible nuclear incident occurred in Ukraine, in which the nuclear reactor exploded. READ MORE

  5. 4. Subgrid finite volume preconditioner for Discontinuous Galerkin implemented in the DUNE framework

    University essay from Lunds universitet/Matematik LTH

    Author : Johannes Kasimir; [2021]
    Keywords : discontinuous galerkin spectral element method; dune; high performance computing; numerical analysis; numerical methods; fluid dynamics; simulation; multigrid; iterative methods; Technology and Engineering;

    Abstract : A Jacobian free multigrid preconditioner for linear problems arising from Implicit Discontinuous Galerkin (DG) discretizations is implemented. The preconditioner is based on a multigrid method for a low order Finite volume (FV) discretization on a subcellgrid. L2-projections are introduced as a strategy to translate between the discretizations. READ MORE

  6. 5. Modeling BOD removal in free watersurface constructed wetlands with variable residence time-based methods

    University essay from Lunds universitet/Avdelningen för Teknisk vattenresurslära

    Author : Degefu Yohannes Sebro; [2021]
    Keywords : BOD removal; Free water-surface constructed wetlands; VART-BOD; models; dynamic diffusion zone; Technology and Engineering;

    Abstract : Constructed wetlands (CWs) have been applied for several years in the removal process pollutants from secondary treatment plants and stormwater. In this paper, the Variable Residence Time (VART) model for solute transport in streams was extended to simulate the BOD removal process in free water surface flow constructed wetlands (FWS CWs). READ MORE