Determination of pressure coefficient for a high-rise building with atypical ground plan

In this article, the results of pressure coefficient on the atypical object obtained by experimental measurements in a boundary layer wind tunnel (BLWT) of Slovak University of Technology in Bratislava (STU) and computational fluid dynamics simulation (CFD) are presented. The pressure coefficient is one of the most important parameters expressing the wind pressure distribution on the structure. The loading by wind can only be acquired by execution of detailed tests and numerical analyses [1].Web of Science14214513

Wind loads and their reduction on mesh fabrics

The presented contribution deals with evaluation of wind loads on various layouts of plastic and steel mesh fabric. To obtain real wind effects and loads, the experimental measurement in the Boundary Layer Wind Tunnel (BLWT) in Bratislava has been prepared. The goal of an investigation is the determination of wind loads on permeable materials – plastic and steel fabric, using wind load reduction factor k. The mean wind pressure on the permeable material is obtained by multiplying the wind pressure to the impermeable surface by the reduction factor k depending on the Reynolds number. The experimentally determined reduction factor can be applied for design of the safety mesh fabric. Wind loads were obtained from measurement of wind velocity by Hot-Wire anemometry (HWA)

Functional aerodynamics and its influence on the energy and thermal mode of a naturally ventilated double-skin transparent façade

This article deals with the dynamics of airflow through a cavity. In windless conditions, where a natural flow causes the flow of air in the cavity, the overall aerodynamic resistance of the cavity is the important aerodynamic parameter, which is the sum of the local resistances alongside the air movement trajectory through the cavity. The total aerodynamic resistance of the cavity must be lesses than the force of the convective buoyancy of the air in the cavity. The following conclusions were found experimentally. The convection occurs in the cavity at every time step with a velocity range from 0.05 ≤ v [m/s] ≤ 0.2 to 0.3. The energy regime in the cavity is characterised by inhomogeneity. In the cavity, there are zones of increasing temperatures along the height of the cavity at the inlet. A large area with increased temperatures at the air outlet and a small area with particularly high temperatures in the upper part of the inlet were found

High-resolution numerical modelling of altimetry-derived gravity data

VEGA 1/0486/2

Design and implementation of CRM type application

Obsahem této diplomové práce je popis aplikace typu CRM (řízení vztahů se zákazníky), charakteristika vlastností, funkcionalit a přínosů, které s sebou tento informační systém přináší. Praktická část se zabývá analýzou, návrhem a implementací vzorového programu na řízení vztahů dle požadavků potenciálního zákazníka.The contents of this work encompass the description of the CRM type application (Customer Relationship Management), its characteristics, functionality and contributions that come with this informational system. The practical part of the paper deals with the analysis, concept and implementation of the sample program for customer relationship management in accordance with the requirements of the prospective client.Katedra softwarových technologiíK samotnému zpracování diplomové práci měli vedoucí i oponent práce věcné připomínky a student měl prostor k jejich vysvětlení. Práce je logicky členěná a stylisticky průměrně zpracována. Student vhodně doplnil práci obrázky a tabulkami pro dokumentaci vývoje systému. Vytvořený systém je funkční a pro fimu použitelný. Zodpověděl všechny zadané otázky zkoušející komise. Komise ohodnotila jeho diplomovou práci stupněm velmi dobře.Dokončená práce s úspěšnou obhajobo

Metatheory in psychotherapy: realism, antirealism and critical hermeneutics as the third alternative

The paper "Metatheory in psychotherapy: realism, antirealism and critical hermeneutics as the third alternative" first presents realist and antirealist metatheory and shows the practical implication of metatheory for the field of psychotherapy. This exposition is then followed by an exposition of critical hermeneutics of Paul Ricoeur, which tries to demonstrate both theoretical and practical superiority of the hermeneutical approach, when compared with the previsously mentioned metatheories. Implications of specific metatheoretical stances are demonstrated on specific material

Distribution of the external pressure coefficients on the elliptic tower: experimental measurement compared with numerical modelling

The wind flow around the elliptical object was investigated experimentally in the BLWT wind tunnel in Bratislava and subsequently solved by computer wind flow simulation. On a high-rise building model, the external wind pressure coefficients were evaluated for different wind directions and then compared with the numerical CFD simulation in ANSYS, where different models of turbulence and mesh types were used. The aim of the article was to evaluate and compare the obtained values and after analysing the results to choose the most suitable model of turbulence and mesh types, which showed the smallest deviations from the experimental values

Pressure Coefficients Acting Upon the Cylinder Obtained by Numerical and Experimental Analysis

Analysis of wind flow acting upon high-rise buildings is a very common topic. This paper deals with experiment in the Boundary Layer Wind Tunnel (BWLT) in Bratislava and comparison with the computational fluid dynamics (CFD) simulation and values given in the Eurocode. The analyzed object was the model of building with circular cross section (cylinder). External wind pressure coefficients were compared in three height levels of model

Experimental Measurements of Drag and Lift Coefficient on Building with an Elliptical Cross-section

The characteristics of aerodynamic forces acting on an elliptic cylinder with an aspect ratio of 0.5 with a wind attack angle from 0 to 90° and subjected to the boundary layer wind tunnel were investigated. The model was initially calibrated and compared with the existing work. The aspect ratio of the investigated model was 0.5, and the model was emerging in a turbulent flow. The mean and fluctuating drag and lift coefficients were investigated. The minimum drag coefficient occurred in the wind direction of 0° and the maximum at 90°. The lift coefficient was the largest in the 30° wind direction and the smallest at 0°. Fluctuating coefficients were similar profiles as the mean coefficients. Around the 30° wind direction, an inappropriate phenomenon occurred, caused by the generation of asymmetrical vortices structures and wake instabilities