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Zobrazují se záznamy 1-15 z 15

    • Geometrical Modeling of Concrete Microstructure for the Assessment of ITZ Percolation 

      Autor: Rypl , Daniel; Bým , Tomáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Percolation is considered to be a critical factor affecting the transport properties of multiphase materials. In the case of concrete, the transport properties are strongly dependent on the interfacial transition zone ...
    • A Numerical Study of Wind Flow Over a Coal Storage Shelter 

      Autor: Bodnár , Tomáš; Beneš , Ludek; Pirkl , Luboš; Gulíková , Eva
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents some of the main numerical results obtained while simulating the wind flow over a shelter covering a coal storage. The aim of this numerical study was to evaluate the change in flow patterns caused by ...
    • Transonic Flow of Wet Steam — Numerical Simulation 

      Autor: Halama , Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The paper presents a numerical simulation of the transonic flow of steam with a non-equilibrium phase change. The flow of steam is approximated by a mixture model complemented by transport equations for moments. Proper ...
    • The Asymptotic Properties of Turbulent Solutions to the NavierStokes Equations 

      Autor: Skalák , Zdenek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      In this paper we study the large time behavior of solutions to the Navier-Stokes equations. We present a brief survey of results concerning energy decay, and discuss a related phenomenon of the large time energy concentration ...
    • Hierarchical Modeling of Mastic Asphalt in Layered Road Structures Based on the MoriTanaka Method 

      Autor: Valenta , Richard; Šejnoha , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      We present an application of the Mori-Tanaka micromechanical model for a description of the highly nonlinear behavior of asphalt mixtures. This method is expected to replace an expensive finite element-based fully-coupled ...
    • A MicromechanicsBased Model for Stiffness and Strength Estimation of Cocciopesto Mortars 

      Autor: Nežerka , Václav; Zeman , Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The purpose of this paper is to propose an inexpensive micromechanics-based scheme for stiffness homogenization and strength estimation of mortars containing crushed bricks, known as cocciopesto. The model utilizes the ...
    • Energetic Approach to Large Strain Gradient Crystal Plasticity 

      Autor: Kratochvíl , Jan; Kružík , Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      We formulate a problem of the evolution of elasto-plastic materials subjected to external loads in the framework of large deformations and multiplicative plasticity. We focus on a spontaneous inhomogenization interpreted ...
    • Simulation of Free Airfoil Vibrations in Incompressible Viscous Flow — Comparison of FEM and FVM 

      Autor: Sváček , Petr; Horáček , Jaromír; Honzátko , Radek; Kozel , Karel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper deals with a numerical solution of the interaction of two-dimensional (2-D) incompressible viscous flow and a vibrating profile NACA 0012 with large amplitudes. The laminar flow is described by the Navier-Stokes ...
    • Synthesis of Mechanisms by Methods of Nonlinear Dynamics 

      Autor: Valášek , Michael; Šika , Zbynek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper deals with a new method for parametric kinematic synthesis of mechanisms. The traditional synthesis procedure based on collocation, correction and optimization suffers from the local minima of objective functions, ...
    • Physical and Chemical Aspects of the Nucleation of CementBased Materials 

      Autor: Demo , Pavel; Sveshnikov , Alexey; Hošková , Šárka; Ladman , David; Tichá , Petra
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      A theoretical model of the nucleation of portlandite is proposed, and the critical size of a portlandite cluster and the energy barrier of nucleation are determined. The steady state nucleation rate and the time lag of the ...
    • Massive Parallelization of Multibody System Simulation 

      Autor: Valášek , Michael; Mráz , Ladislav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper deals with the decrease in CPU time necessary for simulating multibody systems by massive parallelization. The direct dynamics of multibody systems has to be solved by a system of linear algebraic equations. ...
    • Micromechanical Analysis of Cement Paste with Carbon Nanotubes 

      Autor: Šmilauer , Vít; Hlaváček , Petr; Padevět , Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Carbon nanotubes (CNT) are an attractive reinforcement material for several composites, due to their inherently high strength and high modulus of elasticity. There are controversial results for cement paste with admixed ...
    • HygroThermoMechanical Analysis of a Reactor Vessel 

      Autor: Kruis , Jaroslav; Koudelka , Tomáš; Krejčí , Tomáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Determining the durability of a reactor vessel requires a hygro-thermo-mechanical analysis of the vessel throughout its service life. Damage, prestress losses, distribution of heat and moisture and some other quantities ...
    • Global Optima for Size Optimization Benchmarks by Branch and Bound Principles 

      Autor: Pospíšilová , Adéla; Lepš , Matej
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper searches for global optima for size optimization benchmarks utilizing a method based on branch and bound principles. The goal is to demonstrate the process for finding these global optima on the basis of two ...
    • OOFEM — an Objectoriented Simulation Tool for Advanced Modeling of Materials and Structures 

      Autor: Patzák , Bořek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The aim of this paper is to describe the object-oriented design of the finite element based simulation code. The overall, object-oriented structure is described, and the role of the fundamental classes is discussed. The ...