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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 102
Bublík, Ondřej , Pecka, Aleš , Vimmr, Jan
Curvilinear element of the discontinuous Galerkin method designed to capture the labyrinth seal geometry exactly

The present study applies the discontinuous Galerkin finite element method to a numerical simulation of a compressible fluid flow through a labyrinth seal. This paper is proposes a curvilinear hexahedral element, which is deformed in such a way that it matches the rotated walls...

Pašek, Jan
Infračervená termografie ve facility managementu

Building management is a multidisciplinary field involving the care of buildings and their operation. This area is currently undergoing dynamic development in the Czech Republic. However, in the countries of Western Europe and the USA, this is already a very developed field with a&...

Pašek, Jan
Technický stav středověkých kamenných chrámů v Angkoru, 1. díl

The Archaeological Park in Angkor, Cambodia, is a world-famous and unique construction and archeological site. It consists of hundreds of stone monuments from the medieval Khmer empire - many of which are slowly decreasing and falling apart. The Czech national project in Angkor coo...

Rohan, Eduard , Camprová Turjanicová, Jana , Liška, Václav
Geometrical model of lobular structure and its importance for the liver perfusion analysis

A convenient geometrical description of the microvascular network is necessary for computationally efficient mathematical modelling of liver perfusion, metabolic and other physiological processes. The tissue models currently used are based on the generally accepted schematic structure of the parenchyma...

Rohan, Eduard , Cimrman, Robert
Modelling wave dispersion in fluid saturating periodic scaffolds

Acoustic waves in a slightly compressible fluid saturating porous periodic structure are studied using two complementary approaches: 1) the periodic homogenization (PH) method provides effective model equations for a general dynamic problem imposed in a bounded medium, 2) harmonic acoustic waves&...

Bublík, Ondřej , Lobovský, Libor , Heidler, Václav , Mandys, Tomáš , Vimmr, Jan
Experimental validation of numerical simulations of free surface flow within casting mold cavities

The paper targets on providing new experimental data for validation of the well-established mathematical models within the framework of the lattice Boltzmann method (LBM), which are applied to problems of casting processes in complex mould cavities. Design/methodology/approach: An experimental&#x...

Pašek, Jan , Sojková, Veronika
Facility Management of Smart Buildings

The current development of smart buildings is conditioned by the development of smart technologies, bringing many new phenomena into the construction industry that change ownership, user and management environments. The optimized and truly functional smart building already includes engineering and...

Beránek, Václav , Šťastný, Petr , Nováček, Vít
School Injuries and their prevention from the present perspective

Background: Injuries are considered worldwide to be the most significant health problem, especially in childhood. In the Czech Republic, injuries are the most common cause of death among children and young adults. The aim of the study was to provide more insight in school acci...

Rendl, Jan , Dyk, Štěpán , Smolík, Luboš
Nonlinear dynamic analysis of a tilting pad journal bearing subjected to pad fluttering

This work brings an overview of the nonlinear dynamics of four-segment tilting pad journal bearings (TPJB) in load-between-pads configuration supported on flexible pivots. We focus primarily on analysing the sub-synchronous motion of statically unloaded pads, also called pad fluttering. In this&#...

Hynčík, Luděk , Kochová, Petra , Špička, Jan , Bońkowski, Tomasz , Cimrman, Robert , Kaňáková, Sandra , Kottner, Radek , Pašek, Miloslav
Identification of the LLDPE Constitutive Material Model for Energy Absorption in Impact Applications

Current industrial trends bring new challenges in energy absorbing systems. Polymer materials as the traditional packaging materials seem to be promising due to their low weight, structure, and production price. Based on the review, the linear low-density polyethylene (LLDPE) material was id...

Heidler, Václav , Bublík, Ondřej , Pecka, Aleš , Vimmr, Jan
Eulerian-Lagrangian and Eulerian-Eulerian approaches for the simulation of particle-laden free surface flows using the lattice Boltzmann method

This paper studies the Eulerian-Lagrangian and Eulerian-Eulerian approaches for the simulation of interaction between free surface flow and particles. The dynamics of the fluid as well as the transport of the particles in the Eulerian description is solved using the lattice Boltzmann me...

Lobovský, Libor , Bublík, Ondřej , Heidler, Václav , Vimmr, Jan
Numerical and experimental prediction of free surface flow of shear-thinning fluids

Within this study, a prediction of free surface flow during the gravity casting of shear-thinning fluids is of interest. An experimental test setup which enables analysis of the casting flow by means of opti- cal measurements is designed and an in-house computational fluid dynamics...

Zeman, Vladimír , Dyk, Štěpán , Hlaváč, Zdeněk
Two-stage modelling of hexagonal fuel assemblies vibration considering mechanical nonlinearities

The paper presents a complex modelling concept for the nuclear fuel assembly vibration caused by the coolant pressure pulsations generated by the main circulation pumps. The method is based on the two-stage modelling with the reactor's global model at the first stage and the&#x...

Aromolaran, Ademuyiwa S. , Nalos, Lukáš , Jarkovská, Dagmar , Švíglerová, Jitka , Süß, Annabell , Záleský, Jakub , Rajdl, Daniel , Krejčová, Milada , Kuncová, Jitka , Rosenberg, Josef , Štengl, Milan
TdP Incidence in Methoxamine-Sensitized Rabbit Model Is Reduced With Age but Not Influenced by Hypercholesterolemia

Metabolic syndrome is associated with hypercholesterolemia, cardiac remodeling, and increased susceptibility to ventricular arrhythmias. Effects of diet-induced hypercholesterolemia on susceptibility to torsades de pointes arrhythmias (TdP) together with potential indicators of arrhythmic risk were investigated in t...

Jonášová, Alena , Vimmr, Jan
On the relevance of boundary conditions and viscosity models in blood flow simulations in patient‐specific aorto‐coronary bypass models

Physiologically realistic results are the aim of every blood flowsimulation. This is not different in aorto‐coronary bypasses where the properties of the coronary circulation may significantly affect the relevance of the performed simulations. By considering three patient‐specific bypass geometries, t...

Bulín, Radek , Hajžman, Michal
Efficient computational approaches for analysis of thin and flexible multibody structures

A large group of real mechanical problems can be modelled and analysed using the approaches of flexible multibody dynamics. The computational models in the form of differential-algebraic equations can be quite complex, and therefore it is suitable to develop efficient approaches for the...

Rohan, Eduard , Heczko, Jan
Homogenization and numerical modelling of poroelastic materials with self-contact in the microstructure

We present a two-scale homogenization-based computational model of porous elastic materials subject to external loads inducing the self-contact interaction at the pore level. Microstructures under consideration are constituted as periodic lattices generated by a representative cell consisting of a sol...

Mandys, Tomáš , Kroupa, Tomáš , Laš, Vladislav
The Non-Linear Sandwich Structure Model for Low-Velocity Impact

This article is focused on progressive failure analysis of sandwich composite structure subjected to transverse low-velocity impact loading. A user defined material model considering non-linear behaviour of the composite skin of the sandwich structure was implemented into commercial software Abaqus&#x...

Pálek, Richard , Jonášová, Alena , Rosendorf, Jáchym , Mik, Patrik , Bajcurová, Kristýna , Hošek, Petr , Moulisová, Vladimíra , Eberlová, Lada , Haidingerová, Lenka , Brzoň, Ondřej , Bednář, Lukáš , Kříž, Tomáš , Dolanský, Martin , Třeška, Vladislav , Tonar, Zbyněk , Vimmr, Jan , Liška, Václav
Allogeneic Venous Grafts of Different Origin Used for Portal Vein Reconstruction After Pancreaticoduodenectomy – Experimental Study

Background: In clinical medicine, little is known about the use of allografts for portal vein (PV) reconstruction after pancreaticoduodenectomy (PD). Portal and caval systems are physiologically different, therefore the properties of allografts from caval and portal systems were studied here in&#...

Rohan, Eduard , Nguyen, Vu-Hieu , Naili, Salah
Numerical modelling of waves in double-porosity Biot medium

We consider acoustic waves in fluid-saturated periodic media with large contrasts in the permeability and other poroelastic coefficients, whereby some of the mesoscopic material parameters depend on the scale parameter. The effective behaviour is described by a model obtained using the homog...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 102