National Repository of Grey Literature 46 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Fluid-structure interaction of compressible flow
Hasnedlová, Jaroslava ; Feistauer, Miloslav (advisor) ; Křížek, Michal (referee) ; Kozel, Karel (referee) ; Rannacher, Rolf (referee)
Title: Fluid-structure interaction of compressible flow Author: RNDr. Jaroslava Hasnedlová Department: Department of Numerical Mathematics, Institute of Applied Mathematics Supervisors: Prof. RNDr. Miloslav Feistauer, DrSc., Dr. h. c., Prof. Dr. Dr. h. c. Rolf Rannacher Supervisors' e-mail addresses: feist@karlin.mff.cuni.cz, rannacher@iwr.uni-heidelberg.de Abstract: The presented work is split into two parts. The first part is devoted to the theory of the discontinuous Galerkin finite element (DGFE) method for the space-time discretization of a nonstationary convection-diffusion initial-boundary value problem with nonlinear convection and linear diffusion. The DGFE method is applied sep- arately in space and time using, in general, different space grids on different time levels and different polynomial degrees p and q in space and time discretization. The main result is the proof of error estimates in L2 (L2 )-norm and in DG-norm formed by the L2 (H1 )-seminorm and penalty terms. The second part of the thesis deals with the realization of fluid-structure interaction problem of the compressible viscous flow with the elastic structure. The time-dependence of the domain occupied by the fluid is treated by the ALE (Arbitrary Lagrangian-Eulerian) method, when the compress- ible Navier-Stokes equations are formulated in...
Sport and its Place in Christian Life
Šafářová, Světlana ; Michalcová, Andrea (referee) ; Kozel, Karel (advisor)
Bc thesis SPORT AND ITS PLACE IN CHRISTIAN LIFE wants to unveil a man as the whole image of the God. We have been living with the hope of salvation and we will be saved as the whole - our body, soul and spirit. Spiritual dimension of the body is based on the faith of its ressurection. The body needs the same care, attention, creativity and gratitude to the Creator as the soul and spirit do. The sport is one of the way to the care of the body. This thesis wants not only critically evaluate the place of the sport and activity of the body in Christian life but also to find its blind alleyways and risks. It also deals with the question how significant the integration of regular sport activities into the curriculum of teological faculties can be in additon to the intelectual and spiritual formation. KEY WORDS sport, physical exercise, play, Christian life, body
Interaction of a Fluid Flow with an Elastic Body
Mádlík, Martin ; Maršík, František (advisor) ; Kozel, Karel (referee) ; Rajagopal, K.R. (referee)
The interaction problem of incompressible fluid and incompressible elastic material in the so-called Arbitrary Lagrangian-Eulerian formulation is be- ing studied in this thesis. After giving an overview of the essential principles of continuum mechanics in the moving domains, the fluid-structure interaction model is defined. Next, appropriate numerical scheme in three-dimensional space, based on finite element method, is presented and suitable numerical implementation is proposed. The properties of the presented numerical method are demonstrated on the number of numerical examples. The simplest approach, decoupling the problem into the fluid and solid parts and treating the interaction between them as an external boundary condition, is later revised by introducing the single continuum formulation. The interaction is then seen as an internal boundary, which does not require any special treatment. The proposed method allows to model the large deformations of an incom- pressible Neo-Hookean material, a flow of an incompressible power-law fluid and a mutual material interaction. The quasi-Newton method is used to solve with the original non-linear problem, while a direct solver is the tool that deals with the resulting linearized form. The numerical implementation takes advantage of parallel programming...
Numerical Calculation of 2D Transonic Flow Over Profile
Slouka, M. ; Kozel, Karel
Mathematical models used in this work are based on the calculation of inviscid and viscous compressible transonic flow over the profile which is given 8% DCA blade cascade. Two different numerical models are used and compared with experimental measurements.
Numerical experiments with the turbulent flow through the DCA 8% cascade
Trefilík, Jiří ; Kozel, Karel ; Příhoda, Jaromír
The work is concerned with the development of a numerical method for a simulation of transonic turbulent flow and the simulation of the flow through the DCA 8% cascade. For turbulence modelling the algebraic Baldwin-Lomax model and the two-equation standard and modified (SST) models were employed and the numerical results are presented.
Numerical Solution of 3D Airflow in Channel Representing a Vocal Tract
Pořízková, P. ; Kozel, Karel ; Horáček, Jaromír
This study deals with the numerical solution of a 3D compressible flow of a viscous fluid in a channel for low inlet airfloe velocity. the channel is a simplified model of the glottal space in the human vocal tract. The system of Navier-Stokes equations has been used as mathematical model of laminar flow of the compressible viscous fluid in a domain. The numerical solution is implemented using the finite volume method (FVM)and the predictor-corrector MacCormack scheme with artifical viscosity using a grid of quadrilateral cells.
Numerical Solution of 2D Transonic Inviscid and Viscous Compressible Flow in Channel
Slouka, M. ; Kozel, Karel
The work deals with 2D numerical solution of the transonic inviscid and viscous compressible flow in the channel. Results are based on the solution of the system of Euler equations and Navier-Stokes equations with additional algebraic Baldwin-Lomax model of turbulence.
Numerical Simulations of Turbulent Transonic Flow Through a Cascade
Trefilík, Jiří ; Kozel, Karel ; Příhoda, Jaromír
In this paper some newly obtained results in the simulation of turbulent transonic flow through the 8% DCA cascade are presented and compared with previous results. The simulations are based on two different turbulence models and as a reference also calculations for inviscid fluid are included.

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8 Kozel, K.
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