Search for dissertations about: "Johan Hoffman"

Showing result 1 - 5 of 16 swedish dissertations containing the words Johan Hoffman.

2. 1. Adaptive Finite Element Methods for Fluid Structure Interaction Problems with Applications to Human Phonation

   Author : Niyazi Cem Degirmenci; Johan Hoffman; Johan Jansson; David Nordsletten; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fluid Structure Interaction; Finite Element Method; Contact Modeling; Acoustic Coupling; High Performance Computing; Tillämpad matematik och beräkningsmatematik; Applied and Computational Mathematics;

   Abstract : This work presents a unified framework for numerical solution of Fluid Structure Interaction (FSI) and acoustics problems with focus on human phonation. The Finite Element Method is employed for numerical investigation of partial differential equations that model conservation of momentum and mass. READ MORE

4. 2. High Performance Adaptive Finite Element Methods : With Applications in Aerodynamics

   Author : Niclas Jansson; Johan Hoffman; Johan Jansson; Vincent Heuveline; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : The massive computational cost for resolving all scales in a turbulent flow makes a direct numerical simulation of the underlying Navier-Stokes equations impossible in most engineering applications. Recent advances in adaptive finite element methods offer a new powerful tool in Computational Fluid Dynamics (CFD). READ MORE

5. 3. High-Performance Finite Element Methods : with Application to Simulation of Diffusion MRI and Vertical Axis Wind Turbines

   Author : Van-Dang Nguyen; Johan Hoffman; Johan Jansson; Axel Målqvist; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; High performance finite element method; computational diffusion MRI; turbulent flow; vertical axis wind turbine.; Computer Science; Datalogi;

   Abstract : The finite element methods (FEM) have been developed over decades, and together with the growth of computer engineering, they become more and more important in solving large-scale problems in science and industry. The objective of this thesis is to develop high-performance finite element methods (HP-FEM), with two main applications in mind: computational diffusion magnetic resonance imaging (MRI), and simulation of the turbulent flow past a vertical axis wind turbine (VAWT). READ MORE

6. 4. High Performance Finite Element Methods with Application to Simulation of Vertical Axis Wind Turbines and Diffusion MRI

   Author : Van Dang Nguyen; Johan Hoffman; Johan Jansson; Mats Larson; KTH; []
   Keywords : High performance finite element method; computational diffusion MRI; turbulent flow; vertical axis wind turbine; Cloud computing.; högprestanda finita elementmetod; beräkningsdiffusionsmagnetresonanstomografi; turbulent flöde; vertikalaxlad vindturbin; datormolnberäkning; Tillämpad matematik och beräkningsmatematik; Applied and Computational Mathematics; Biological Physics; Biologisk fysik; Computer Science; Datalogi; Engineering Mechanics; Teknisk mekanik; Mathematics; Matematik; Biological and Biomedical Physics; Biologisk och biomedicinsk fysik;

   Abstract : Finite element methods have been developed over decades, and together with the growth of computer power, they become more and more important in dealing with large-scale simulations in science and industry.The objective of this thesis is to develop high-performance finite element methods, with two concrete applications: computational fluid dynamics (CFD) with simulation of turbulent flow past a vertical axis wind turbine (VAWT), and computational diffusion magnetic resonance imaging (CDMRI). READ MORE

7. 5. Patient-Specific Finite Element Modeling of the Blood Flow in the Left Ventricle of a Human Heart

   Author : Jeannette Hiromi Spühler; Johan Hoffman; Johan Jansson; Mariano Vazquez; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Finite element method; Arbitrary Lagrangian-Eulerian method; Fluid-Structure interaction; Contact model; parallel algorithm; blood flow; left ventricle; aortic valves; patient-specific heart model;

   Abstract : Heart disease is the leading cause of death in the world. Therefore, numerous studies are undertaken to identify indicators which can be applied to discover cardiac dysfunctions at an early age. READ MORE