Essays about: "divergence free"

Showing result 1 - 5 of 16 essays containing the words divergence free.

1. 1. SECOND-ORDER DIVERGENCE-FREE FEM FOR MAGNETOHYDRODYNAMICS USING LAGRANGE POLYNOMIALS

   University essay from Uppsala universitet/Institutionen för informationsteknologi

   Author : Erik Björklund; Peter Mårtensson; Noah Waltman; [2023]
   Keywords : ;

   Abstract : AbstractMaxwell’s laws state that the divergence of a magnetic field always remains zero. In thecontinuous setting this is true for the magnetohydrodynamics equations. However, in thediscrete setting, the solution does not always remain divergence-free. READ MORE

3. 2. Monitoring of heat exchanges in thesnowpack of Foxfonna glacier, Spitzbergen,Svalbard.

   University essay from Lunds universitet/Förbränningsfysik; Lunds universitet/Fysiska institutionen

   Author : Thibault Desjonquères; [2022]
   Keywords : Glaciers; Glaciology; Svalbard; Geophysics; Superimposed Ice; Foxfonna; Geology.; Physics and Astronomy;

   Abstract : The processes of meltwater storage in firn and the impact of refreezing on firn-coveredglaciers have been investigated on the Greenland ice-sheet. On Svalbard, climate changepromotes the disappearance of firn on glaciers. READ MORE

4. 3. High-performance implementation of H(div)-conforming elements for incompressible flows

   University essay from Uppsala universitet/Avdelningen för beräkningsvetenskap

   Author : Niklas Wik; [2022]
   Keywords : Finite elements; H div -conforming; incompressible flows; incompressible Navier-Stokes equations; high-performance; matrix-free; Raviart-Thomas;

   Abstract : In this thesis, evaluation of H(div)-conforming finite elements is implemented in a high-performance setting and used to solve the incompressible Navier-Stokes equation, obtaining an exactly point-wise divergence-free velocity field. In particular, the anisotropic Raviart-Thomas tensor-product polynomial space is considered, where the finite element operators are evaluated with quadrature in a matrix-free fashion using sum-factorization on tensor-product meshes. READ MORE

5. 4. Asynchronous Divergence-Free Smoothed Particle Hydrodynamics

   University essay from Blekinge Tekniska Högskola/Institutionen för programvaruteknik

   Author : Theo Holmqvist Berlin; [2021]
   Keywords : SPH; regional time stepping; divergence free; simulation;

   Abstract : Background. Fluid simulation is an area of ongoing research. In recent years, simulators have become more realistic and stable, partly by employing the condition of having divergence-free velocity fields. A divergence-free velocity field is a strict constraint that requires a high level of correctness in a simulation. READ MORE

6. 5. An application of Bayesian Hidden Markov Models to explore traffic flow conditions in an urban area

   University essay from Uppsala universitet/Statistiska institutionen

   Author : Lovisa Andersson; [2019]
   Keywords : Bayesian statistics; hidden states; Markov chain; traffic flow modeling; filtering; smoothing; most probable state sequence; MCMC; Hamiltonian Monte Carlo; No-U-Turn sampler;

   Abstract : This study employs Bayesian Hidden Markov Models as method to explore vehicle traffic flow conditions in an urban area in Stockholm, based on sensor data from separate road positions. Inter-arrival times are used as the observed sequences. READ MORE