Rozprawy doktorskie na temat „Flow simulation”
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Myre, David D. "Model fan passage flow simulation". Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23962.
Pełny tekst źródłaEnge, Leo, i Felix Liu. "Crowd Simulation Using Flow Tiles". Thesis, KTH, Skolan för teknikvetenskap (SCI), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231025.
Pełny tekst źródłaSimuleringar av folkmassor används i ett ökande antal olika tillämpningar, som evakueringsscenarion, datorspel och specialeffekter för film. Detta skapar en efterfrågan efter simulatorer som är enkla att använda och tillgängliga för användare från olika ämnesområden och bakgrunder. Vi kommer att studera flow tile-metoden som Chenney [1] föreslår. Metoden är ett intuitivt och interaktivt sätt att skapa divergensfria hastighetsfält för olika tillämpningar. En omimplementation av Chenneys metod kommer att ges och implementationen kommer att evalueras i termer av användarvänlighet och hur väl användningen av hastighetsfält som är statiska och definierade i rummet passar för simulering av folkmassor. Vidare kommer möjligheten att använda hastighetsfälten för andra liknande tillämpningar, som robotik, att diskuteras också.
Ahmad, Reza Amini. "Produktutveckling skorstensfläkt i Flow Simulation". Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80573.
Pełny tekst źródłaReasor, Daniel Archer. "Numerical simulation of cellular blood flow". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42760.
Pełny tekst źródłaSwarbrick, Sean James. "Finite element simulation of viscoelastic flow". Thesis, Teesside University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278423.
Pełny tekst źródłaChristian, Andrew D. (Andrew Dean). "Simulation of information flow in design". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11102.
Pełny tekst źródłaZhu, Lailai. "Simulation of individual cells in flow". Doctoral thesis, KTH, Stabilitet, Transition, Kontroll, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-142557.
Pełny tekst źródłaQC 20140313
Li, Yiguang. "Three-Dimensional Flow and Performance Simulation of Multistage Axial Flow Compressors". Thesis, Cranfield University, 2000. http://dspace.lib.cranfield.ac.uk/handle/1826/4591.
Pełny tekst źródłaABRUNHOSA, JOSE DINIZ MESQUITA. "TURBULENT COMPLEX FLOW SIMULATION WITH CLASSICAL MODELING AND LARGE EDDY SIMULATION". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=4346@1.
Pełny tekst źródłaUma investigação da capacidade de previsão de modelos de turbulência baseados na modelagem estatística clássica e de grandes escalas é apresentada. A modelagem estatística clássica de turbulência (média de Reynolds) foi analisada, através da solução de escoamentos complexos, como, por exemplo, o escoamento turbulento em degrau (backstep). Especial atenção foi dada aos modelos kapa-epsilon de baixo Reynolds e as variantes renormalizadas (RNG). O comportamento dos vários termos da equação da energia cinética turbulenta na região da parede foram analisados em detalhes, especialmente o termo de difusão de pressão. Avaliou-se a importância da correta modelagem do termo de difusão de pressão sobre as predições dos modelos de baixo número de Reynolds, nas regiões de recirculação. Alguns modelos, propostos na literatura para o termo de difusão de pressão, foram também avaliados teórica e numericamente. A capacidade de previsão da metodologia de simulação de grandes escalas (LES por Large Eddy Simulation) também foi realizada. O desempenho do modelo de Smagorinsky para prever escoamentos limitados por fronteiras sólidas foi avaliado do ponto de vista computacional. Utilizou-se o método de volumes finitos para integrar tanto as equações médias de Reynolds quanto as equações LES. O escoamento turbulento em canal foi resolvido de modo bidimensional e tridimensional. Já o escoamento em degrau (backstep) foi resolvido exclusivamente de modo bidimensional, enquanto o escoamento em um duto de seção quadrada foi simulado de modo tridimensional. Os resultados foram comparados com aqueles obtidos pelos modelos de baixo Reynolds, analisando-se a relação custo-benefício.
An investigation of turbulence models prediction capacity based on classical statistical modeling and large eddy simulation (LES) is presented. The classical statistical modeling (average of Reynolds) was analyzed, by investigating the solution of complex flows, as, for example, the turbulent flow past a backwardfacing- step (backstep). Special attention was given to low Reynolds number k-e models and models derived by renormalization group theory (RNG). The behavior of the different terms in the turbulent kinetic energy equation in the near wall region was examined in details, specially the pressure diffusion term. It was evaluated the importance of the correct modeling of the pressure diffusion term on the predictions of the low Reynolds number models, in recirculating flows. A few models, proposed in the literature for the pressure diffusion term, were also evaluated theoretically and numerically. The prediction capacity of large eddy simulation (LES) technique was also investigated. The ability of Smagorinsky model to predict complex limited wall flows was analyzed from a computational standpoint. The finite-volume method was employed to integrate both the Reynolds average and LES equations. The fully developed turbulent channel flow was solved in two- dimensional and three-dimensional numerical simulations. The turbulent flow over a backward-facing-step was computed exclusively in a twodimensional manner, while the fully developed turbulent flow in a straight square duct was simulated in a three-dimensional manner. The results were compared with those obtained by the low Reynolds models, analyzing the cost-benefit relation.
Wang, Roy J. "Simulation based evaluation on the effects of jaywalking". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 77 p, 2009. http://proquest.umi.com/pqdweb?did=1885755931&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Pełny tekst źródłaFarooq, Muhammad Asif. "Cartesian Grid Method for Compressible Flow Simulation". Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16538.
Pełny tekst źródłaSolomon, Luiza. "Learning and flow control in optimistic simulation". Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29475.
Pełny tekst źródłaThe Time Warp simulation engine TWSIM provides our laboratory with a research medium for Time Warp simulations in a distributed-memory environment such as a network of workstations. The modular design of TWSIM allows for easy integration of any new simulation application and for fast testing of optimizations and improvements to the Time Warp mechanism. Its compact size and object-oriented implementation using the C++ programming language result in a short learning curve for future users and developers.
The flow control algorithm proposed by Choe was implemented and analyzed with the aid of the TWSIM simulation engine. The algorithm makes use of stochastic learning automata to balance simulations loads by continuously regulating the flow of events between processors during the course of the simulation. Three different load metrics are considered: memory usage, virtual time, and a space-time product of the first two metrics. The algorithm was tested with two different simulation applications: a queuing network simulation and a Personal Communication Services (PCS) simulation. Results show that the flow control algorithm reduces the memory usage; the number of rollbacks and the number of antievents at the expense of the simulation time. As well, it becomes apparent that the behaviour of the flow control algorithm is not a consequence of learning.
Finally, we discuss a number of approaches to learning and flow control using the outlines of the flow control algorithm, and we consider the extent of the performance improvement to be expected from memory-based schemes for limiting Time Warp optimism in a distributed-memory environment.
Carnevali, Emanuele. "Simulation of a viscoelastic Taylor-Couette flow". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Znajdź pełny tekst źródłaGobert, Christian. "Large Eddy Simulation of particle-laden flow". kostenfrei, 2010. https://mediatum2.ub.tum.de/node?id=829484.
Pełny tekst źródłaOu, Zhiliang. "Numerical simulation of flow around vertical cylinders". University of Western Australia. School of Civil and Resource Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0185.
Pełny tekst źródłaSuicmez, Vural Sander. "Pore scale simulation of three-phase flow". Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441972.
Pełny tekst źródłaStallard, Timothy J. "Simulation of unsteady viscous flow-structure interaction". Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418130.
Pełny tekst źródłaClark, N. R. "Kinematic simulation of a turbulent channel flow". Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597714.
Pełny tekst źródłaSukirman, Y. "Petroleum reservoir simulation coupling flow and subsidence". Thesis, Swansea University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639129.
Pełny tekst źródłaGillespie, Jennifer L. "Modelling and computer simulation of patient flow". Thesis, Ulster University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.646847.
Pełny tekst źródłaUMEMURA, TOMONARI, RYO KOMIYAMA i KAZUHIRO YAMAMOTO. "NUMERICAL SIMULATION ON FLOW IN COLUMN CHROMATOGRAPHY". World Scientific Publishing, 2013. http://hdl.handle.net/2237/20053.
Pełny tekst źródłaGunter, Simon. "Numerical simulation of non-isothermal flow problems". Thesis, Aberystwyth University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320936.
Pełny tekst źródłaYang, Zhiyan. "Numerical simulation of incompressible and compressible flow". Thesis, University of Sheffield, 1989. http://etheses.whiterose.ac.uk/3485/.
Pełny tekst źródłaFerrar, Mark David. "Simulation of packing and flow in composites". Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304986.
Pełny tekst źródłaKhobeiz, Mohamed Hussien. "Numerical simulation of viscous incompressible turbomachinery flow". Thesis, University of Sheffield, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338828.
Pełny tekst źródłaZhang, Zhao Kang. "Downhole fluid flow simulation during tripping operations". Thesis, Robert Gordon University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364683.
Pełny tekst źródłaBatten, Paul. "Compressible flow simulation on a parallel computer". Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358770.
Pełny tekst źródłaJones, Dorian Phillip. "Parallel simulation of turbulent square duct flow". Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294548.
Pełny tekst źródłaJames, Richard. "Numerical simulation of flow through fluidic flowmeters". Thesis, Cranfield University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282180.
Pełny tekst źródłaGeurts, Kevin Richard. "Stochastic simulation of non-Newtonian flow fields /". Thesis, Connect to this title online; UW restricted, 1995. http://hdl.handle.net/1773/9821.
Pełny tekst źródłaAl-Saad, Mohammed. "Blood flow simulation using smooth particle hydrodynamics". Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/105588/.
Pełny tekst źródłaZhang, Jie. "Numerical Simulation of Flow in Ozonation Process". Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5161.
Pełny tekst źródłaDong, Bonian. "Numerical simulation of two-dimensional lifting flow". Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101182.
Pełny tekst źródłaM.S.
Yaacob, Zulkefli. "Modelling and simulation of transient gas flow". Thesis, University of Salford, 1996. http://usir.salford.ac.uk/26975/.
Pełny tekst źródłaLe, Roux Frederick Nicolaas. "The CFD simulation of an axial flow fan". Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4344.
Pełny tekst źródłaENGLISH ABSTRACT: The purpose of this project is to investigate the method and accuracy of simulating axial ow fans with three-dimensional axisymmetric CFD models. Two models are evaluated and compared with experimental fan data. Veri cation data is obtained from a prototype fan tested in a facility conforming to the BS 848 standards. The ow eld over the blade surfaces is investigated further with a visualization experiment comprising of a stroboscope and wool tufts. Good correlation is found at medium to high ow rates and recommendations are made for simulation at lower ow rates as well as test guidelines at the fan test facility. The results and knowledge gained will be used to amend currently used actuator disc theory for axial ow fan simulation.
AFRIKAANSE OPSOMMING: Die doel van hierdie projek is om die metode en akkuraatheid om aksiaalvloeiwaaiers met drie-dimensionele BVM modelle te simuleer, te ondersoek. Twee modelle word geëvalueer en met eksperimentele waaiertoetse vergelyk. Veri- kasie data is verkry vanaf 'n prototipe waaier wat in 'n fasiliteit getoets is en wat aan die BS 848 standaarde voldoen. Die vloeiveld oor die lemoppervlaktes word ondersoek met 'n visualisering eksperiment wat uit 'n stroboskoop en wolletjies bestaan. Goeie korrelasie word gevind vir medium tot hoë massavloeie en aanbevelings word gemaak vir die simulasie by laer massavloeie met riglyne vir toetswerk in die toets-fasiliteit. Die resultate en kennis opgedoen sal gebruik word in die verbetering van huidige aksieskyfteorie vir numeriese aksiaalvloeiwaaier simulasies.
Oner, Erdinc. "A SIMULATION APPROACH TO MODELING TRAFFIC IN CONSTRUCTION ZONES". Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1108146637.
Pełny tekst źródłaSeyedein, Seyed Hossein. "Simulation of fluid flow and heat transfer in impingement flows of various configurations". Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69587.
Pełny tekst źródłaPittard, Matthew Thurlow. "Large Eddy Simulation Based Turbulent Flow-induced Vibration of Fully Developed Pipe Flow". Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd295.pdf.
Pełny tekst źródłaPittard, Matthew T. "Large eddy simulation based turbulent flow-induced vibration of fully developed pipe flow /". Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd295.pdf.
Pełny tekst źródłaCai, Mingchao. "Modeling and numerical simulation for the coupling of surface flow with subsurface flow /". View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?MATH%202008%20CAI.
Pełny tekst źródłaKoc, Gencer. "Simulation Of Flow Transients In Liquid Pipeline Systems". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12609018/index.pdf.
Pełny tekst źródła, Genç
er M.S., Department of Mechanical Engineering Supervisor: Prof. Dr. O. Cahit Eralp November 2007, 142 pages In liquid pipeline systems, transient flow is the major cause of pipeline damages. Transient flow is a situation where the pressure and flow rate in the pipeline rapidly changes with time. Flow transients are also known as surge and Waterhammer which originates from the hammering sound of the water in the taps or valves. In liquid pipelines, preliminary design parameters are chosen for steady state operations, but a transient check is always necessary. There are various types of transient flow situations such as valve closures, pump trips and flow oscillations. During a transient flow, pressure inside the pipe may increase or decrease in an unexpected way that cannot be foreseen by a steady state analysis. Flow transients should be considered by a complete procedure that simulates possible transient flow scenarios and by the obtained results, precautions should be taken. There are different computational methods that can be used to solve and simulate flow transients in computer environment. All computational methods utilize basic v flow equations which are continuity and momentum equations. These equations are nonlinear differential equations and some mathematical tools are necessary to make these equations linear. In this thesis a computer program is coded that utilizes &ldquo
Method of Characteristics&rdquo
which is a numerical method in solving partial differential equations. In pipeline hydraulics, two partial differential equations, continuity and momentum equations are solved together, in order to obtain the pressure and flow rate values in the pipeline, during transient flow. In this thesis, MATLAB 7.1 is used as the programming language and obtained code is converted to a C# language to be able to integrate the core of the program with a user friendly Graphical User Interface (GUI). The Computer program is verified for different scenarios with the available real pipeline data and results of various reputable agencies. The output of the computer program is the tabulated pressure and flow rate values according to time indexes and graphical representations of these values. There are also prompts for users warning about possible dangerous operation modes of the pipeline components.
Wu, Wen-Yu, i 吳文瑜. "Flow Simulation of Electrophoresis". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/51754661512241243850.
Pełny tekst źródła國立成功大學
機械工程學系
86
Electrophoresis is a technology of the separation of different charged particles. Particles suspended in an electrolyte, under the influence of an applied electric field, tend to migrate toward the electrode which has oppositesign of the particle charge. Moving particles in the electrolyte are alsosubjected to drag force. So the terminal velocity of a particle is determinedby its charge-to-mass ratio. Time consuming of detection, large size of the capillary and limited efficiency are the major drawbacks of the traditional electrophoresis apparatus. The latest trend of the electrophoresis is to combine with MEMS technology, which minimizes the size of the capillary and saves the cost and time of detection. In this paper, the mathematical models of electrophoretic separation are reviewed to help the determination of theelectrophoretic parameters. The influence of bending capillary on theefficiency of electrophoretic separation is also investigated. It is shownthat the efficiency of separation is reduced by the presence of bending capillary.
Ahmed, Forhad. "Simulation of puddle flow in planar flow casting". 2005. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=370368&T=F.
Pełny tekst źródłaFortin, Michael. "Interactive Simulation of Fluid Flow". Thesis, 2011. http://spectrum.library.concordia.ca/7276/1/Fortin_MCompSc_S2011.pdf.
Pełny tekst źródłaCheng, Kuang-Jung, i 鄭光榮. "Simulation of Turbulent Step Flow". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/57438274623924823285.
Pełny tekst źródła淡江大學
水資源及環境工程學系
86
Title of Thesis: Simulation of Turbulent Step Flow Total Pages: 55Key Word: turbulent, step flow, finite analytic methodName of Institute: Graduate Institute of Water Resources and Environment Engineering, Tamkang UniversityGraduate Date: June, 1998 Degree Conferred: Master of ScienceName of Student: Cheng Kuang-Jung Advisor: Dr. Luke Chen 鄭 光 榮 陳 俊 成 博士Abstract: This research uses Finite Analytic Method to simulate the Two-DimensionTurbulent Step Flow under the circumstances of low Reynold Number. We apply for K-ε-E model in the turbulent flow and uses Wall- Function near the wallsto simulate boundary sub-layer. By changing the Two- Dimension turbulent Step Flow geometry coefficient (Expansion Ratio) and Reynold Number to find out the location of its vortex center and Reattachement length. The results are: 1.When using Finite Analytic Method, we correctly use boundary profile inorder to respond to the real world. 2.The characteristics of laminar sub-layer can be showed when using Wall-function in the Non-separation Zone and computing time can also be reduced. 3.When the geometry coefficient E=1.5, and the Reynold Number is between 5000and 11000, its reattachment length(XR/h) is about 4.8. 4.When the geometry coefficient E=2.0, and the Reynold Number is between 5000and 11000, its reattachment length XR/h) is about 4.9.5.When the geometry coefficient E=3.0, and the Reynold Number is between 5000and 11000, its reattachment length(XR/h) is around 3.9.
Carlsson, Victor, Philip Isaac i Persson Adina. "Simulation of Viscosity-Stratified Flow". Thesis, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-413537.
Pełny tekst źródłaFang, Hsun-He, i 方巽禾. "Simulation of Cross-flow Microfiltration by Multiphase Flow Model". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/06675461103661323109.
Pełny tekst źródła淡江大學
化學工程與材料工程學系碩士班
95
The study simulates cross-flow microfiltration by multiphase flow model. In order to discuss cake property and fouling mechanism, we experiment on cross-flow microfiltration. The data can be compared with simulation results and realize the property of cross-flow microfiltration. A filter membrane, made of mixed cellulose ester, with a mean pore size of 0.1 μm is used to filter 0.8 μm PMMA particles. On two-phase flow while varying suspension concentration and cross-flow velocity, we show that filtration rate is lowered with higher suspension concentration and lower cross-flow velocity, while average porosity is lowered as well. Also, we use Computational Fluid dynamics, CFD, software FLUENT6.2’s multiphase flow model to estimate cake growth and use force analysis to figure out fouling mechanism. Lastly, using results obtained from dynamic experiment, we know that cake average porosity is lower with filtration time, however, cake resistance is higher.
Yang, Deng-Shun, i 楊登順. "Thermal-Flow Simulation of Plastics Extrusion Flow Distributor Design". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ex4kyb.
Pełny tekst źródła國立雲林科技大學
機械工程系
106
The traditional bottle process is produced by injection blow molding. Recently, an automatic production method which plastic is transported by continuous extrusion integrated rotary injection blow-molding has been proposed. It is distributed to multiple cavities through an extrusion distributor. However, these manufacturing process problems, including heater power, flow imbalance, uneven shear, temperature inhomogeneity and heat distortion, must be solved. This study begins with initial heater power simulations which we compare with actual power tests. These comparisons include temperature distribution and heat distortion. In-depth simulations to improve the average temperature of each flow channel, optimize the average temperature, and minimize the effect of temperature on flow. Finally, the flow balance analysis was performed to investigate factors other than temperature discrepancies between flow channels. The results show that the mold configuration and uncertain factors must be considered. However, comparisons of the temperature distribution simulations with the measurements reveal discrepancies mainly due to uncertainty in air convention conditions. Comparisons between simulations and measurements suggest different thermal convection coefficients for each location. Heat distortion measurements of the lower part reveal discrepancies with estimated value due to temperature inhomogeneity. A comparison between a heat distortion measurement of the whole distributor and estimated value shows that the heat distortion discrepancy of the distribution plate dues to different temperature between flow channels and measuring points. The temperature discrepancies between flow channels are mainly due to the heater configuration in the upper distribution cover and in the distribution plate. Fine tuning of the configuration was needed to further improve the simulation. The temperature discrepancies after this fine adjustment of the distribution plate configuration was further reduced by 5~6 ̊C. The flow imbalance is due to uneven shear rate, causing discrepancies of about 2%. Keywords: plastics extrusion, die transient heat transfer analysis, die heat distortion, die flow distributor design, die flow balancing, extrusion dies
Chen, Li —. Wen, i 陳麗雯. "Laboratory In-Vehicle Guidance Simulator with Integrated Traffic Flow Simulation". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/22780879023431425367.
Pełny tekst źródła淡江大學
運輸管理學系
89
Recent development in Dynamic Route Guidance System (as a subsystem of Advanced Travel Information System) has called for more studies in the subject of users’ compliance behavior, which affect the effectiveness of the provided in-vehicle roue guidance information. Although field test may be promising in a long run, large initiated capital investment will be involved and may not be appropriate in the early stage of system development. Laboratory experiment provides an economical alternative approach to handle this particular issue with great flexibility. A prototype of laboratory simulator has therefore been established from previous studies in this institute under Dr. Tong''s supervision as a dedicated tool of controlled experiment to collect such observations due to economical and practical considerations. This simulator is a computer based simulation system to mimic the basic functions of a DRGS of which provides traffic condition, navigation, and route guidance information through screen display. This particular design (SIM 1.0) includes five modulus components: a display module, a record module, a data base module, a computation module and a user operation interface module, and has proven its capability from a series of completed experiments. The objective of this thesis is to modify and to extend the flexibility of the prototype simulator. Two major modifications needed are (1) to add the network selection function instead of a fixed (default) experiment network, and (2) to integrate a traffic simulation program onto this original prototype system to substitute original survey-based fixed-timed traffic data base. These two modifications will allow the further studies to in-cop with experiment design technique to investigate more in-depth issues regarding the trilateral interactions of user/traffic network/information with DRGS. Accomplished in this thesis are three tasks. Firstly, a preliminary survey was conducted to explore the role of traffic network characteristic (which we found that was largely ignored by transportation related research articles). Secondly, analysis of the original simulator program and the selection/decomposition of the specific traffic simulation program were performed in order to realize the integration with programs in different computer languages. Finally, a series of tests were carried out to ensure seamless integration Results of this study have clearly demonstrated the justification of the issue of network characteristic within a DRGS context and the successful limited modification to current simulator with a selected traffic simulation program DYNASMART. Possible full-scale integration issues were also presented in this thesis which leads to more challenges for further studies
(10709238), Yuanpei Zhao. "A Comparison of Air Flow Simulation Techniques in Architectural Design". Thesis, 2021.
Znajdź pełny tekst źródłaThe fluid simulation in computer generates realistic animations of fluids by solving Navier-Stokes equation. The methods of simulation are divided into two types. The grid-based methods and particle-based methods. The former one is wildly used for scientific computation because of its precision of simulation while the latter one is used in visual effects, games and other areas requiring real-time simulation because of the less computation time it has.
The indoor airflow simulations with HVAC system in construction design is one specific application in scientific computation and uses grid-based simulation as the general-purpose simulation does. This study addresses the problem that this kind of airflow simulations in construction design using grid-based methods are very time consuming and always need designers to do pretreatment of the building model, which takes time, money, and effort. On the other hand, the particle-based methods would have less computation time with an acceptable accuracy in indoor airflow simulations because this kind of simulation does not require very high precision.
Then this study conducts a detailed and practical comparison of different fluid simulation algorithms in both grid-based methods and particle-based ones. This study's deliverable is a comparison between particle-based and grid-based methods in indoor airflow simulations with HVAC system.
The overall methodology used to arrive at the deliverables of this study will need two parts of work. The benchmark data is gathered from a CFD software simulation using FVM with a decent grid resolution. The particle-based data will be generated by simulation algorithms over the same set of room and furniture models implemented by OpenGL and CUDA. After the benchmark FVM simulation being conducted in a CFD software, the temperature field of airflow will be measured. After simulation, the temperature field are gained on each one of 4 particle-based simulation. A comparison standard is set and data will be analyzed to get the conclusion. The result shows that in a short simulation time period, after finding a proper number of particles, the particle-based method will achieve acceptable accuracy of temperature and velocity field while using much less time.