Relevant bibliographies by topics / Kiev computer

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Kiev computer'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Kiev computer"

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Romanenkova, Julia, Anna Paliychuk, and Vadym Mykhalchuk. "Kiev ex-libris school as a xylography traditions keeper in printmaking of modern Ukraine." Journal of graphic engineering and design 12, no. 3 (2021): 39–45. http://dx.doi.org/10.24867/jged-2021-3-039.

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The article is dedicated to Kiev ex-libris school role (EL) in modern Ukrainian printmaking. The loss process by a bookplate of utilitarian, applied functions and its transformation into an independent work of art, collectors' object of interest with an appreciated art value is described. The ex-libris schools formed in the first quarter of the 21st century are emphasized, the main trends of the bookplate development predominant centers are defined (Kiev, Lvov, Odessa, Luhansk). Printmaking techniques, typical for a particular ex-libris school, are marked. Kiev bookplate school, as one of the leading centers for the classical xylography traditions preservation, is underlined. The most significant masters, working in these techniques, are presented, the technological process evolution is indicated and its main reasons are emphasized. The problem of opposition between the old and new in the art of printmaking is touched upon by example of classical techniques and gathering momentum computer graphics (CGA) coexistence.
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Savchuk, M. N. "Works of the Kiev school of theoretical cryptography." Cybernetics and Systems Analysis 46, no. 3 (2010): 386–404. http://dx.doi.org/10.1007/s10559-010-9214-1.

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Каплун, В. В., С. М. Краснитський та В. М. Бобровник. "МАТЕМАТИЧНЕ МОДЕЛЮВАННЯ ЕЛЕКТРОСПОЖИВАННЯ У БУДІВЛЯХ ЗАКЛАДІВ ВИЩОЇ ОСВІТИ. ПОВІДОМЛЕННЯ 2." Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 132, № 2 (2019): 9–23. http://dx.doi.org/10.30857/1813-6796.2019.2.1.

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The aim of the work is the development of mathematical models and the study on their basis of the characteristics of electrical consumption in higher educational institutions (using the example of hostels of the Kiev National University of Technology and Design). Method. Multiple regression analysis and intelligence analysis in combination with computer software implementations of the corresponding statistical procedures were used.
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Radzevich, Stephen P. "A Novel Approach for Computation of Constraints on Parameters of Modification of the Tooth Addendum of Precision Involute Hobs." Journal of Mechanical Design 128, no. 4 (2005): 803–11. http://dx.doi.org/10.1115/1.2202879.

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In this paper a novel modified scheme and effective computer representation for hobbing operation of precision involute gears is presented. The specific goals of the paper are as follows: (a) to provide a comprehensive understanding of the principal features of addendum modification of an involute gear hob tooth, (b) to come up with a novel approach for the computation of parameters of modification of the hob tooth addendum, (c) to determine the applicability and advantages of the application of the developed approach. The key concept in this paper is satisfaction of the necessary conditions of proper part surface generation (Radzevich, S. P., 2002, Computer Aided Design, 34, pp. 727–740) in gear hobbing operation. The research is performed with the application of the novel DG∕K approach of surface machining earlier developed by the author. The DG∕K approach of surface generation is based on fundamental results obtained in differential geometry of surfaces, and in kinematics of multiparametric motion of a rigid body in E3 space. The interested reader may wish to go to the monographs (Radzevich, S. P., 2001, Monograph Kiev, Rastan; 1991, Monograph, Kiev, Vishcha Shkola Publishing) for details. Both of the monographs are available from The Library of Congress. A novel approach for the computation of constraints on the actual values of addendum modification of an involute hob is reported in this paper. The advantages of the developed approach are threefold. It yields the computation: (a) of the minimum and the maximum allowed value of the normal pressure angle; (b) of the maximum allowed value of addendum modification of an involute hob, and (c) of the maximum allowed reduction of addendum of a gear hob. In the way of implementation is also described.
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Radzevich, Stephen P. "On Satisfaction of the Fifth Necessary Condition of Proper Part Surface Generation in Design of Plunge Shaving Cutter for Finishing of Precision Involute Gears." Journal of Mechanical Design 129, no. 9 (2006): 969–80. http://dx.doi.org/10.1115/1.2748452.

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In this paper, a novel modified scheme and effective computer representation for design of a plunge shaving cutter is presented. The paper aims to develop a novel design of shaving cutter for plunge shaving of precision involute gears. The study is carried out on the premise of satisfaction of the fifth necessary condition of proper part surface generation (PSG) when designing the plunge shaving cutter. In the current study, the author’s earlier developed DG/K method of surface generation is used together with the principal elements of analytical mechanics of gears. (The DG/K method is based on fundamental results obtained in differential geometry of surfaces, and on kinematics of multi-parametric motion of a rigid body in the E3 space. The interested reader may wish to go for details to the monograph: Radzevich, S.P., Fundamentals of Surface Generation, Monograph, Kiev, Rastan, 2001, 592 pp., and to: Radzevich, S.P., Sculptured Surface Machining on Multi-Axis NC Machine, Monograph, Kiev, Vishcha Schola, 1991, 192 pp.) In the particular case under consideration, the method employs (a) an analytical description of the gear tooth surface to be machined, (b) configuration of the plunge shaving cutter relative to the involute gear, (c) analytical representation of the coordinate systems transformations, and (d) the fifth condition of proper PSG that is adapted to finishing of precision involute gears. The fifth condition of proper PSG is investigated in the paper. On the premise of the obtained results of the investigation, a novel design of plunge shaving cutter for finishing of precision involute gears is proposed. The developed novel design of plunge shaving cutter can be used on shaving machines available on the market, e.g. on Gleason’s new Genesis™ 130SV computer numerical control (CNC) shaving machine.
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Gornyy, V. I., S. G. Kritsuk, I. Sh Latypov, et al. "Thermophysical properties of land surface in urban areas (by satellite remote sensing of Saint Petersburg and Kiev)." Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa 14, no. 3 (2017): 51–66. http://dx.doi.org/10.21046/2070-7401-2017-14-3-51-66.

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Radzevich, Stephen P. "Computation of Parameters of a Form Grinding Wheel for Grinding of Shaving Cutter for Plunge Shaving of Topologically Modified Involute Pinion." Journal of Manufacturing Science and Engineering 127, no. 4 (2005): 819–28. http://dx.doi.org/10.1115/1.2037087.

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The paper is targeting on the finishing of precision gears for low-noise/noiseless transmission for cars and light trucks. Transmission error is the predominant cause of gear noise. The application of a topologically modified pinion results in reduction of transmission error up to two times. The required modification of the pinion tooth surface is provided on a plunge shaving operation with application of a shaving cutter of an appropriate design. A novel approach for computation of parameters of a form grinding wheel for grinding of the shaving cutter for plunge shaving of a precision involute pinion with topologically modified tooth surface is reported in the paper. The developed approach for computation of parameters of the form grinding wheel is focused on application of the shaving cutter grinder with a lack of CNC articulation. The problem under consideration is solved using the DG/K-based approach of part surface machining earlier developed by the author. (The DG/K-approach is based on fundamental results obtained in differential geometry of surfaces, and in kinematics of multi-parametric motion of a rigid body in E3 space (See Radzevich, S.P., Sculptured Surface Machining on Multi-Axis CNC Machine. Monograph, 1991, Vishcha Shkola Publishers, Kiev (in Russian). See also Radzevich, S.P., 2001, Fundamentals of Surface Machining. Monograph, Rastan, Kiev (in Russian).) An analytical solution to the problem is discussed in the paper. The solution has been used for developing software for the Mitsubishi ZA30CNC shaving cutter grinder for the needs of the automotive industry. Computer simulation reveals high accuracy of the ground shaving cutter.
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Danchuk, Viktor, Olena Bakulich, and Vitaliy Svatko. "Building Optimal Routes for Cargo Delivery in Megacities." Transport and Telecommunication Journal 20, no. 2 (2019): 142–52. http://dx.doi.org/10.2478/ttj-2019-0013.

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Abstract The main purpose of the study is to develop a method based on the modified ant algorithm and demonstrate the applicability of its use for building of optimal cargo delivery routes, taking into account the real (non-stationary) dynamics of highdensity traffic on the urban road network in megacities. Within the framework of the proposed method the simulation of building optimal routes, by the example of Kiev, was carried out. The results of study indicate the possibility of using the method for the solution to the problems of efficient management of the freight transportation routing process in the conditions of real dynamics of traffic flows (dense traffic, traffic jam, emergency situations, etc.).
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Abramov, Vadym. "APPLICATION OF COMBINED MODELS OF COMPUTER NETWORKS IN THE TRAINING PROCESS." Cybersecurity: Education Science Technique, no. 4 (2019): 24–31. http://dx.doi.org/10.28925/2663-4023.2019.4.2431.

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An overview of computer network simulation tools is being conducted in order to create a methodology for studying the relevant disciplines in higher school. The analysis of positive and negative properties of virtual and physical means of simulation of computer networks is carried out. It is concluded that the best for educational institutions are combined models that are quite budget and allow to compile and study practically unlimited topologies of networks, as well as gain experience with real physical equipment. The analysis of virtual simulation tools shows that they contain the means of interaction of the virtual network with external real equipment. This makes it possible to create a composite platform in which part of the model is virtual and the part is actually physical. This allows budget funds to quickly create models of large numbers of networks and allows students to get more information on working with hardware in conditions close to real industrial networks. The platform of the combined modeling is very convenient to use for researching systems on the Internet of Things. It helps in designing to simulate and explore real-world control systems for a large number of virtual "Smart Things" that are presented in the new Cisco Packet Tracer 7.0 simulator. These virtual things can be controlled from external means of the real world through laptops, tablets, etc. Create realistic control programs and related software for this and adjust them in conditions of maximum approximation to reality. New modeling technologies are the basis for the emergence of new teaching methods that are used at the Kiev University of B. Grinchenko.
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Konduri, Niranjan, Kelly Sawyer, and Nataliya Nizova. "User experience analysis of e-TB Manager, a nationwide electronic tuberculosis recording and reporting system in Ukraine." ERJ Open Research 3, no. 2 (2017): 00002–2017. http://dx.doi.org/10.1183/23120541.00002-2017.

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Ukraine has successfully implemented e-TB Manager nationwide as its mandatory national tuberculosis registry after first introducing it in 2009. Our objective was to perform an end-of-programme evaluation after formal handover of the registry administration to Ukraine's Centre for Disease Control in 2015.We conducted a nationwide, cross-sectional, anonymous, 18-point user experience survey, and stratified the registry's transaction statistics to demonstrate usability.Contrary to initial implementation experience, older users (aged >50 years), often with limited or no computer proficiency prior to using the registry, had significantly better user experience scores for at least six of the 12 measures compared to younger users (aged 18–29 years). Using the registry for >3 years was associated with significantly higher scores for having capacity, adequacy of training received and satisfaction with the registry. Of the 5.9 million transactions over a 4-year period, nine out of 24 oblasts (regions) and Kiev city accounted for 62.5% of all transactions, and corresponded to 59% of Ukraine's tuberculosis burden. There were 437 unique active users in 486 rayons (districts) of Ukraine, demonstrating extensive reach.Our key findings complement the World Health Organization and European Respiratory Society's agenda for action on digital health to help implement the End TB Strategy.
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Dissertations / Theses on the topic "Kiev computer"

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Zack, Thomas. "Trace element mineral analysis in high pressure metamorphic rocks from Trescolmen, Central Alps." 2000. http://hdl.handle.net/11858/00-1735-0000-0006-B35D-F.

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Books on the topic "Kiev computer"

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Instytut problem modeli︠u︡vanni︠a︡ v enerhetyt︠s︡i im. H.I︠E︡. Pukhova. Sbornik trudov konferent︠s︡ii Modelirovanie-2006--Simulation-2006, 16-18 mai︠a︡ 2006, Kiev. Institut problem modelirovani︠a︡ v ėnergetike im. G.E. Pukhova NAN Ukrainy, 2006.

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EnterEX '96 (1996 Kiev, Ukraine). EnterEX '96: Modern information technologies : the 3rd international exhibition, Ukraine, Kiev, February 19th-24th, 1996, National Exhibition Center : [catalogue] = Sovremennye informat͡s︡ionnye tekhnologii : tretʹi͡a︡ mezhdunarodnai͡a︡ vystavka, Ukraina, Kiev, 19-24 fevrali͡a︡ 1996 g., Nat͡s︡ionalʹnyĭ vystavochnyĭ t͡s︡entr : [katalog]. EuroIndex, 1996.

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EnterNET '95 (1995 Kiev, Ukraine). EnterNET '95: 1-i͡a︡ spet͡s︡ializirovannai͡a︡ vystavka i forum, Kompʹi͡u︡ternye seti i telekommunikat͡s︡ii : Ukraina, Kiev, 14-18 noi͡a︡bri͡a︡ 1995 g., Nat͡s︡ionalʹnyĭ vystavochnyĭ t͡s︡entr : [katalog. MIDI, EuroIndex, 1995.

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Makhnenko, V. I., and W. Lucas. Computer technology in welding and manufacturing (16th international conference) & Mathematical modelling and information technologies in welding and related processes (3rd international conference): Proceedings of Joint International Conference 6-8 June, Kiev, E.O. Paton Electric Welding Institute. E.O. Paton Electric Welding Institute of the NAS of Ukraine, 2006.

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Hemment, P. L. F., Denis Flandre, and A. N. Nazarov. Science and Technology of Semiconductor-On-Insulator Structures and Devices Operating in a Harsh Environment: Proceedings of the NATO Advanced Research Workshop on Science and Technology of Semiconductor-On-Insulator Structures and Devices Operating in a Harsh Environment Kiev, Ukraine 2630 April 2004 00. Kluwer Academic Publishers, 2005.

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Symposium, VDM-Europe International. VDM '90: VDM and Z : formal methods in software development : Third International Symposium of VDM Europe, Kiel, FRG, April 17-21, 1990 proceedings. Springer-Verlag, 1990.

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VDM '90 (1990 Kiel, Germany). VDM '90: VDM and Z : formal methods in software development : Third International Symposium of VDM Europe, Kiel, FRG, April 17-21, 1990 proceedings. Springer-Verlag, 1990.

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Attila, Sali, and SpringerLink (Online service), eds. Foundations of Information and Knowledge Systems: 7th International Symposium, FoIKS 2012, Kiel, Germany, March 5-9, 2012. Proceedings. Springer Berlin Heidelberg, 2012.

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(Kiev, Ukraine) Lpar 1994. Logic Programming and Automated Reasoning: 5th International Conference, Lpar '94 Kiev, Ukraine, July 16-22, 1994 : Proceedings (Lecture Notes in Computer Science). Springer, 1994.

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(Editor), Joachim W. Schmidt, and Anatoly A. Stogny (Editor), eds. Next Generation Information System Technology: First International East/West Data Base Workshop, Kiev, USSR, October 9-12, 1990. Procceedings (Lecture Notes in Computer Science). Springer, 1991.

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Book chapters on the topic "Kiev computer"

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Schellhorn, Gerhard, and Axel Burandt. "KIV." In Lecture Notes in Computer Science. Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/3-540-58867-1_57.

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Braßel, Bernd, and Frank Huch. "The Kiel Curry System KiCS." In Lecture Notes in Computer Science. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00675-3_13.

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Aslaksen, Ingvild Eide, Elisabeth Svanberg, Kjetil Fagerholt, Lennart Christian Johnsen, and Frank Meisel. "Ferry Service Network Design for Kiel fjord." In Lecture Notes in Computer Science. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-59747-4_3.

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Drexler, Rainer, Wolfgang Reif, Gerhard Schellhorn, Kurt Stenzel, Werner Stephan, and Andreas Wolpers. "The KIV system a tool for formal program development." In Lecture Notes in Computer Science. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/3-540-56503-5_69.

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Glück, Roland, and Florian Benedikt Krebs. "Towards Interactive Verification of Programmable Logic Controllers Using Modal Kleene Algebra and KIV." In Relational and Algebraic Methods in Computer Science. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24704-5_15.

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Conference papers on the topic "Kiev computer"

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Yoshioka, Masaharu, Yutaka Nomaguchi, and Tetsuo Tomiyama. "Proposal of an Integrated Design Support Environment Based on the Model of Synthesis." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/dac-21155.

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Abstract We propose a new integrated computational environment, called a Knowledge Intensive Engineering Framework (KIEF), to support design object modeling, during engineering design process that requires a variety of design object models, such as a geometric model, a control model, and a finite element model. KIEF is capable of guiding designers with design process knowledge based on a model of synthesis, of integrating multiple design object models, and of maintaining consistency among these models. The design process knowledge is a result of a research project we conduct to establish a model of synthesis. This model formalizes design process knowledge in a design process as operations to a multiple model-based reasoning system, such as KIEF, and from a language of synthesis. We describe a prototype system that incorporates design process knowledge to KIEF and illustrate an example design on it.
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Town, J., A. Akturk, and C. Camcı. "Total Pressure Correction of a Sub-Miniature Five-Hole Probe in Areas of Pressure Gradients." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69280.

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Five-hole probes, being a dependable and accurate aerodynamic tools, are excellent choices for measuring complex flow fields. However, total pressure gradients can induce measurement errors. The combined effect of the different flow conditions on the ports causes the measured total pressure to be prone to a greater error. This paper proposes a way to correct the total pressure measurement. The correction is based on the difference between the measured total pressure data of a Kiel probe and a sub-miniature prism-type five-hole probe. By comparing them in a ducted fan related flow field, a line of best fit was constructed. The line of best fit is dependent on the slope of the line in a total pressure versus span and difference in total pressure between the probes at the same location. A computer program, performs the comparison and creates the correction equation. The equation is subsequently applied to the five-hole probe total pressure measurement, and the other dependent values are adjusted. The validity of the correction is then tested by placing the Kiel probe and the five-hole probe in ducted fans with a variety of different tip clearances.
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Tiribuzi, Stefano. "Very Rough Grid Approach for CFD Modelling of Thermoacoustic Oscillations Inside an Annular Premixed Combustor." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90055.

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Large pressure oscillations due to thermoacoustic instabilities may occur in the modern gas turbine equipped with lean premixed burners. The Research Department of ENEL is studying this phenomenon using research methods that include plant supervision, laboratory experiments and modelling. This paper presents a new CFD modelling approach capable of simulating the time evolution of thermofluiddynamic fields during thermoacoustic instabilities in a whole annular combustor. Its peculiarity consists in the adoption of a very rough computational mesh. The use of the Very Rough Grid (VRG) approach allows all the resonant cavities involved in the acoustic oscillations to be considered, as well as to prolonging the computed transient until spontaneous thermoacoustic oscillations onset, with affordable computation time. The rationale of this approach is that thermoacoustic instabilities are more affected by acoustics than by fluiddynamics. KIEN, an in-house low diffusive URANS code capable of simulating 3D reactive flows, has been used. A 3D structured monoblock computational grid of an industrial annular combustor has been set up. It goes from the compressor outlet to the turbine inlet, including both the annular plenum and the annular combustion chamber, and extends over the entire circumferential angle. The results obtained by an exemplifying computed case are illustrated. They appear to be congruent with the real behaviour of thermoacoustic oscillation reported in literature. The type of information that can be extracted directly or by suitable post-processing from these results is shown and their usefulness in interpreting the real data obtained from functioning plants or experimental facilities is demonstrated.
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Tiribuzi, Stefano. "CFD Simulation of Noise in Gas Turbine Combustors by Means of Turbulence Refluctuation Method." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50241.

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The paper describes a numerical simulation methodology based on CFD for deriving and analyzing the spectral and spatial characteristics of combustion noise in industrial gas turbine combustors. ENEL is testing the combustion section of a medium size pure hydrogen-fed gas turbine, during which pressure fluctuation levels are also measured to asses the combustion stability. Pressure probes are located in colder zones only, but information on the fluctuations levels throughout the whole component are also desired. For this purpose, a simple empirical and, to the knowledge of the author, original method, based solely on CFD modelling, was developed for reproducing in a realistic way the spatial and transient characteristics of the acoustic flow field inside the combustor volumes. The method employs a sparse and persistent excitation on a wide frequency spectrum, by imposing a stochastic fluctuating component to the velocity computed on each grid node throughout the entire computational domain. The intensity of this additional component is proportional to the local level of the modelled turbulent velocity, so the method will be shortly designated as PRMT (Partial Refluctuation of Modelled Turbulence). This method requires that all the acoustically connected volumes be included in the computational domain and that transients be protracted for a time sufficient to provide meaningful spectral information. KIEN, an in-house low diffusive URANS code capable of simulating 3D reactive flows, was used. The adopted Very Rough Grid approach made it possible to protract the simulated transient for a long time, with an affordable computing time. Comparison with in-plant measured data shows that the refluctuation method provides a realistic qualitative description of the noise spectrum. The spatial distribution of computed acoustic field is also derived and analyzed.
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Mercan, Bayram, Eda Doğan, Yashar Ostovan, and Oğuz Uzol. "Experimental Investigation of the Effects of Waveform Tip Injection in a Low Pressure Turbine Cascade." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69316.

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This paper presents the results of an experimental study that investigates the effects of uniform/waveform tip injection along the camberline on the total pressure loss and wake flow characteristics downstream of a row of Low Pressure Turbine (LPT) blades. The experiments are performed in a low speed cascade facility. This injection technique involves spanwise jets at the tip that are issued from a series of holes along the camber line normal to the freestream flow direction. The injection mass flow rate from each hole is individually controlled using computer driven solenoid valves and therefore the flow injection geometrical pattern at the tip can be adjusted to any desired waveform shape, and can be uniform as well as waveform along the camber. Measurements involve Kiel probe traverses for different injection scenarios 0.5 axial chords downstream of the blades as well as Time-Resolved Particle Image Velocimetry (Tr-PIV) measurements at different spanwise locations. Results show that tip injection significantly reduces the total pressure loss levels created by the leakage vortex. Highest overall loss reduction occurs in the case of reversed-triangular injection. The least effective waveform is triangular injection. Loss levels do not seem to get reduced significantly in the passage vortex zone. Velocity, vorticity and turbulence fields created by the passage and leakage vortices get influenced by tip injection. There is significant reduction in the extent of the low momentum zone of the leakage vortex with injection. This effect is much less pronounced for the passage vortex. On the other hand, complex flow patterns are observed within the passage vortex, especially in the case of reversed-triangular injection, such as a possible embedded vortical structure along the passage vortex core, which creates double peaks in the velocity and turbulent kinetic energy fields and complex patterns in Reynolds shear stress.
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Lengani, D., D. Simoni, M. Ubaldi, P. Zunino, F. Bertini, and V. Michelassi. "Accurate Estimation of Profile Losses and Analysis of Loss Generation Mechanisms in a Turbine Cascade." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64244.

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The paper analyzes losses and the loss generation mechanisms in a low-pressure turbine cascade by Proper-Orthogonal-Decomposition (POD) applied to measurements. Total pressure probes and time resolved particle image velocimetry (TR-PIV) are used to determine the flow field and performance of the blade with steady and unsteady inflow conditions varying the flow incidence. The total pressure loss co-efficient is computed by traversing two Kiel probes upstream and downstream of the cascade simultaneously. This procedure allows a very accurate estimation of the total pressure loss coefficient also in the potential flow region affected by incoming wake migration. The TR-PIV investigation concentrates on the aft portion of the suction side boundary layer downstream of peak suction. In this adverse pressure gradient region the interaction between the wake and the boundary layer is the strongest, and it leads to the largest deviation from a steady loss mechanism. POD applied to this portion of the domain provides a statistical representation of the flow oscillations by splitting the effects induced by the different dynamics. The paper also describes how POD can dissect the loss generation mechanisms by separating the contributions to the Reynolds stress tensor from the different modes. The steady condition loss generation, driven by boundary layer streaks and separation is augmented in presence of incoming wakes by the wake-boundary layer interaction and by the wake dilation mechanism. Wake migration losses have been found to be almost insensitive to incidence variation between nominal and negative (up to −9deg), while at positive incidence the losses have a steep increase due to the alteration of the wake path induced by the different loading distribution.
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Tiribuzi, Stefano. "CFD Modelling of Thermoacoustic Oscillations Inside an Atmospheric Test Rig Generated by a DLN Burner." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53738.

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The ENEL Produzione Research Centre of Pisa is deeply involved in the study of flame instabilities which could arise in particular operating conditions in the gas turbine equipped with Dry Low NOx (DLN) lean premixed combustors. An atmospheric pressure test facility, named TAO (Turbogas ad Accesso Ottico), is presently used to test, under scaled conditions, the onset of self-sustained thermoacoustic instabilities during the operation of a typical DLN burner. To support this activity, Computation Fluid Dynamic (CFD) analyses are carried out by means of KIEN, an in-house Reynold Averaged Navier Stokes (RANS) code, for simulating 3D instationary reactive flows. A 3D geometrical model, extending from the air plenum upstream the burner up to the end of the long exhaust tube, is adopted. The great extension of the calculation domain, coupled with the long real time required for the spontaneous onset of oscillations, could became computationally very onerous for Large Eddy Simulation (LES) codes, which require a strong control on the cell maximum size throughout the entire domain, while it can be acceptable for an instationary RANS code, which could use a coarser grid. This allows the simulation of long real transients with overnight runs. Starting from uniform no-motion conditions, the same fluctuating behaviour, detected during TAO experiments, spontaneously onsets in the numerical simulations too. The experimental and numerical frequencies are nearly the same and the amplitude of the pressure oscillations is very close. Supported by the congruence with experimental available data, computed results are utilized to get a more detailed description of the evolution of many thermofluiddynamics quantities during these instabilities. A wide sample of information that can be derived directly from the output of the instationary RANS code or by postprocessing of its results is provided.
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