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Numerická simulace a vizualizace vytváření syntetizovaného proudu
Trávníček, Zdeněk ; Vogel, Jiří ; Vít, T.
The paper presents the results of numerical and experimental investigations of a synthetic jet generation. The experiments were performed in air by means of flow visualization and hot-wire anemometry. The subsequent numerical simulation was performed using the commercial code FLUENT. The geometry, boundary conditions, and material properties of the numerical simulation were defined according to the real experimental situation.
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Smoke visualization of jet and wake flows
Trávníček, Zdeněk
Flow visualization, as a part of experimental fluid mechanics, is a typical initial step of many experimental studies. It can contribute significantly to the understanding of mechanisms involved in flow fields. Moreover, it can be helpful in the selection of the flow parameters and regions of interest for local and detail point measurements. The visualization can be very beneficial for a precise adjustment of a chosen flow field pattern in a test section if alternative flow field modes are possible. Typical case is a bistable and hysteretic behavior of complex flows. The paper shows a few cases of complex jet and wake flows, namely impinging jets from standard and special nozzles (round and slot nozzles, annular nozzle with a fluidic or acoustic control, two-slot nozzle, and slot nozzle with the Coanda effect), and a non-isothermal wake flow behind a cylinder in the cross flow.
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Syntetizovaný proud - návrh generátoru a ověření jeho funkce
Trávníček, Zdeněk ; Vít, T. ; de Boer, P. ; Maršík, František
A zero-net-mass-flux actuator was designed, and a synthesis of an air jet was investigated. The operating parameters were suggested near the resonance frequency. The proper actuation was experimentally tested by smoke visualization and hot-wire anemometry. Two typical synthetic jets are presented, namely the so-called "long" and "short" extruded fluid column cases. The maxima of the centerline local and the time-mean velocities reached approximately 27 m/s and 8.7 m/s, respectively.
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Visualizace a numerické modelování stísněného koaxiálního proudu
Trávníček, Zdeněk ; Hrubý, Jan ; Vogel, J.
This study deals with the limiting geometry of confined coaxial jets when the outer diameter of the annular jet is identical with that of the confining round duct. The visualization was made in air, the numerical simulation used software FLUENT. The study focused on laminar flows, and on the stability loss of the inner round jet. To portrayal three-dimensional and helical structures, a stereoscopic technique was employed. The passing frequency was evaluated stroboscopically.
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Network status visualization
Hejna, Martin ; Pavlíček, Luboš (advisor) ; Beneš, Jiří (referee)
The purpose of this diploma thesis is to provide a complex overview for the network status visualization topic. The diploma thesis is structured into four parts. The first one is dedicated to the definition of the most important terms, together with the description of several visualization methods, network metrics and last but not least to the discussion of visualization risks and benefits. In the second part, an own visualization process is at first proposed and then the particular steps of this process are discussed. Easy to understand examples are applied through this part. In the third part, several method of data collection protocols and visualization tools are briefly described. The analyzed tools are graphic libraries, as well as standalone applications and Network Management Systems. The last part is dedicated to the analysis of the current visualization tools used on the VŠE network. A short analysis of the university's network is also made. According to this analysis, an own solution is proposed for a particular part of network.
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Visualization as one of the factors that sell the products and services
Baumrt, Tomáš ; Horný, Stanislav (advisor) ; Krsek, Libor (referee)
This diploma thesis deals with a subject of taking advantage of visualization during the process of product presentation. Its main aim is to find out, if visual presentation (design) of the product cover affects consumer's behaviour during the decision process of buying a particular product. If this influence is proven, a second goal is set up, namely detection of effects of chosen factors of visual presentation on consumer's decision process. Diploma thesis is divided into 6 chapters. The first introduces the topic to the reader and familiarize him with the goals and structure. Second chapter theoretically describes fundamental terms of communication, especially visual communication. The third chapter covers issues concerning the product itself and its advertisement. This chapter brings to the end theoretical part, which gathers information partly from professional literature and partly from authors' knowledge and experiences. Practical part forms the main element of the thesis. Fourth part consists of various methods for analyzing previously questioned problems in detail. Sample questionnaire examining consumer's preference is drawn up as well as graphical proposals of product design. Chapter ends up with a summary of results found out during the query survey. Results are interpreted in details in the fifth chapter, together with an attempt to draw general conclusion. Last chapter summarizes gathered information and evidence. Contribution of this work is not only to emphasize the significance of product cover and its effect on sale. Corporations or more precisely their marketing departments should realize this fact while creating marketing plan and especially advertisement plan. They should pay more attention on appearance of the product cover. Benefit further consists in processing the whole topic, with neither theoretical nor practical literature is concerned, although proven that opposite should count. Thesis tries to show the direction of further investigation, possibly followed by more complex and extensive surveys, which should bring valuable results and could be used not only by firms but also by consumers themselves.
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