Articoli di riviste: "Validated simulation"

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Davis, Andrew, Aleksander Dubas e Ruben Otin. "Enabling validated exascale nuclear science". EPJ Web of Conferences 245 (2020): 09001. http://dx.doi.org/10.1051/epjconf/202024509001.

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The field of fusion energy is about to enter the ITER era, for the first time we will have access to a device capable of producing 500 MW of fusion power, with plasmas lasting more than 300 seconds and with core temperatures in excess of 100-200 Million K. Engineering simulation for fusion, sits in an awkward position, a mixture of commercial and licensed tools are used, often with email driven transfer of data. In order to address the engineering simulation challenges of the future, the community must address simulation in a much more tightly coupled ecosystem, with a set of tools that can scale to take advantage of current petascale and upcoming exascale systems to address the design challenges of the ITER era.

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Taale, Henk, e Frans Middelham. "FLEXSYT-II - A Validated Microscopic Simulation Tool". IFAC Proceedings Volumes 30, n. 8 (giugno 1997): 883–88. http://dx.doi.org/10.1016/s1474-6670(17)43933-4.

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Dessi-Olive, Jonathan, e Timothy Hsu. "A Simulation-Validated Shape Grammar for Architectural Acoustics". Nexus Network Journal 24, n. 1 (27 novembre 2021): 55–73. http://dx.doi.org/10.1007/s00004-021-00583-8.

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Tartz, M., E. Hartmann e H. Neumann. "Validated simulation of the ion extraction grid lifetime". Review of Scientific Instruments 79, n. 2 (2008): 02B905. http://dx.doi.org/10.1063/1.2801376.

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Bhalla, Sanjana, Neil Tolley e Zaid Awad. "Creating a Validated Simulation Training Curriculum in Otolaryngology". Current Otorhinolaryngology Reports 8, n. 1 (27 febbraio 2020): 96–105. http://dx.doi.org/10.1007/s40136-020-00275-w.

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Jabbour, Noel, Troy Reihsen, Nathaniel R. Payne, Marsha Finkelstein, Robert M. Sweet e James D. Sidman. "Validated Assessment Tools for Pediatric Airway Endoscopy Simulation". Otolaryngology–Head and Neck Surgery 147, n. 6 (5 settembre 2012): 1131–35. http://dx.doi.org/10.1177/0194599812459703.

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Belka, Miloslav, Milan Maly, Ondrej Cejpek, Jakub Elcner, Frantisek Lizal, Jan Jedelsky e Miroslav Jicha. "Validated numerical simulation of airflow in child respiratory airways". EPJ Web of Conferences 264 (2022): 01003. http://dx.doi.org/10.1051/epjconf/202226401003.

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Both pulmonary airway geometry and breathing pattern evolve from birth to adulthood. These gradual changes significantly influence airflow dynamics and subsequently particle transport and deposition. Regarding the airway structure, the differences between infants and adults are most profound till 5 years of age. Since that age the child airway geometry can be downsized from adult lungs. The objective of the present work was to investigate airflow patterns in child airways. The digital model of male respiratory airways was downsized to dimensionally correspond to a 5–year old child. Airflow simulations with properly validated RANS k–ω turbulence model were performed under steady inhalation boundary conditions. The inspiratory flow rate was 12.5 L/min. The velocity profiles just upstream of the first bifurcation were validated by Laser–Doppler anemometry (LDA) experiments. A replica of the same geometry as the one used in the simulation was 3D printed and part of the trachea was replaced by a glass tube. LDA measurements in several points upstream of the first bifurcation were carried out. The validated flow patterns were compared to the ones obtained in adult lungs.

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Senfter, Thomas, Manuel Berger, Markus Schweiberer, Serafin Knitel e Martin Pillei. "An Experimentally Validated CFD Code to Design Coandă Effect Screen Structures". Applied Sciences 13, n. 9 (7 maggio 2023): 5762. http://dx.doi.org/10.3390/app13095762.

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Coandă effect screen structures are used to protect hydropower turbines in mountainous regions from impurities of different sizes. To save time during the design phase, computational fluid dynamics simulations (CFD) can support experimental investigations. Experimental investigations and 2D CFD simulations are performed on the base of the Coandă effect screen structure. Flow rates of 7 m3/h, 8 m3/h, and 9 m3/h are simulated, captured by a camera system in the experiments, and compared. In the experimental setting, the fill level of the Coandă rake is measured. For comparison, the RMSE of the y-position fill level is computed between simulation and measurement. Furthermore, the mass flow balance, Π, is evaluated. The RMSE of the y-direction fill level between simulation and measurement is on average 2.1 mm and 4.4 mm for the lower CFD level and the higher CFD level, respectively. Experiments show an average 6.72% higher Π. The reason for this is that 2D CFD does not consider the surface tension of the borders. In the diverted flow region, the flow field based on experiments appears less viscous than in the simulations. CFD simulations are an appropriate tool to support the design process of Coandă effect screens, especially for fill level determination. The validated CFD code can reduce the cost and time of experiments to design future Coandă effect screen structures.

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H, Fan. "Study on Validation of the OPM Reservoir Simulator by Comparative Solution Project". Petroleum & Petrochemical Engineering Journal 4, n. 4 (2020): 1–8. http://dx.doi.org/10.23880/ppej-16000241.

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The Open Porous Media (OPM) reservoir simulation toolkit is a free and open-source development in the reservoir simulation world and one that has received very little attention. OPM Flow is a fully-implicit, black-oil simulator capable of running industry-standard simulation models, which encourage open innovation and reproducible research on modeling and simulation of porous media processes. This study validates and assesses the capabilities of OPM Flow comparing with the industry standard ECLIPSE simulator. Several tests were conducted in order to validate the simulator, including a zero- balance test, symmetrical well test, three simulation models based on the SPE Comparative Solution Project, and a real world dataset from the Norne oilfield in Norway. This variety of tests covers a wide range of reservoir types and specific operating conditions which are representative of expected applications of the software. By comparison it is concluded that OPM Flow reservoir simulator can be considered a validated and capable reservoir simulator that is able to compete with Schlumberger ECLIPSE in many cases and shows great potential for future development. In addition, a basic user interface for queuing and running simulations through the OPM Flow simulator was developed using the Python programming language as well as some modifications to the miscible flooding solver.

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Adamski, Wojciech, e Przemysław Herman. "On use of equations of motion for two-rotor airship". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, n. 8 (8 dicembre 2011): 2093–103. http://dx.doi.org/10.1177/0954406211429762.

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In this article, equations of motion for a two-rotor airship are derived. Moreover, the problem of engine applied forces and torques is analysed, and a trajectory generator is described and implemented into a proportional–derivative control scheme. The theoretical considerations are validated by a set of simulation tests. The simulation model takes into account the structure of the drives, namely the two engines placed symmetrically on both sides of the object. The conducted simulations validate the robustness of the controller in the case of unexpected disturbance occurrence.

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Young, Nathan, Jay Johnson e Kevin G. Ewsuk. "Microelectronics Package Design Using Experimentally-Validated Modeling and Simulation". Key Engineering Materials 484 (luglio 2011): 192–203. http://dx.doi.org/10.4028/www.scientific.net/kem.484.192.

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Packaging high power radio frequency integrated circuits (RFICs) in low temperature cofired ceramic (LTCC) presents many challenges. Within the constraints of LTCC fabrication, the design must provide the usual electrical isolation and interconnections required to package the IC, with additional consideration given to RF isolation and thermal management. While iterative design and prototyping is an option for developing RFIC packaging, it would be expensive and most likely unsuccessful due to the complexity of the problem. To facilitate and optimize package design, thermal and mechanical simulations were used to understand and control the critical parameters in LTCC package design. The models were validated through comparisons to experimental results. This paper summarizes an experimentally-validated modeling approach to RFIC package design, and presents some results and key findings.

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Sajan, Javad A., Peter A. Hilger, James D. Sidman, William E. Walsh, Phillip L. Chaffin, Troy Reihsen e Robert Sweet. "Validated Assessment Tools for Reconstructing Facial Defects in Simulation". Otolaryngology–Head and Neck Surgery 149, n. 2_suppl (23 agosto 2013): P44—P45. http://dx.doi.org/10.1177/0194599813495815a38.

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Kambourides, Miltos E., Serhat Yeşilyurt e Anthony T. Patera. "Non-parametric-validated computer-simulation surrogates: a Pareto formulation". International Journal for Numerical Methods in Engineering 42, n. 6 (30 luglio 1998): 971–1003. http://dx.doi.org/10.1002/(sici)1097-0207(19980730)42:6<971::aid-nme375>3.0.co;2-w.

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Müller, Armin, Ekaterina Kovacheva, Marc Alexander Fritz, Olaf Dössel e Axel Loewe. "Validating a Numerical Simulation of Human Heart Motion Using Clinical Data". Current Directions in Biomedical Engineering 6, n. 3 (1 settembre 2020): 547–50. http://dx.doi.org/10.1515/cdbme-2020-3140.

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AbstractNumerical simulations are increasingly often involved in developing new and improving existing medical therapies. While the models involved in those simulations are designed to resemble a specific phenomenon realistically, the results of the interplay of those models are often not sufficiently validated. We created a plugin for a cardiac simulation framework to validate the simulation results using clinical MRI data. The MRI data were used to create a static wholeheart mesh as well as slices from the left ventricular short axis, providing the motion over time. The static heart was a starting point for a simulation of the heart’s motion. From the simulation result, we created slices and compared them to the clinical MRI slices using two different metrics: the area of the slices and the point distances. The comparison showed global similarities in the deformation of simulated and clinical data, but also indicated points for potential improvements. Performing this comparison with more clinical data could lead to personalized modeling of elastomechanics of the heart.

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Sass, Ádám, Alex Kummer, Zsolt Ulbert e Attila Egedy. "Failure Analysis of Heat Exchangers with a Valid CFD Simulation". Periodica Polytechnica Chemical Engineering 65, n. 4 (26 agosto 2021): 536–49. http://dx.doi.org/10.3311/ppch.17095.

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Energy efficiency, safety and stable operation of units are the most crucial aspects in every industrial process. In this study, Computational Fluid Dynamics (CFD) simulations were used to study heat transfer in a laboratory-sized tubular heat exchanger. A partly 2D axisymmetric and mainly 3D model of the heat exchanger was created and validated with several simulation in different operating points of heating capacity and volume flow. The results of the simulations were compared to experimental data to validate the model. The inlet and outlet temperatures were measured with Pt100 temperature probes, and the surface temperatures were measured with an infrared camera. The heat transfer coefficient was determined based on the surface measurements The validated model was applied for the investigation of performance losses of heat exchanger due to fouling caused by particle deposits along the tube which caused reduced heat transfer surface or performance and a failure of heating wire which caused reduced heating performance, hence altered heat and flow characteristics through the equipment. The results provide useful information not only in the design processes but the operational lifetime as well.

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Daniel, Beatríz Cabrero, Ricardo Marques, Ludovic Hoyet, Julien Pettré e Josep Blat. "A Perceptually-Validated Metric for Crowd Trajectory Quality Evaluation". Proceedings of the ACM on Computer Graphics and Interactive Techniques 4, n. 3 (22 settembre 2021): 1–18. http://dx.doi.org/10.1145/3480136.

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Simulating crowds requires controlling a very large number of trajectories and is usually performed using crowd motion algorithms for which appropriate parameter values need to be found. The study of the relation between parametric values for simulation techniques and the quality of the resulting trajectories has been studied either through perceptual experiments or by comparison with real crowd trajectories. In this paper, we integrate both strategies. A quality metric, QF, is proposed to abstract from reference data while capturing the most salient features that affect the perception of trajectory realism. QF weights and combines cost functions that are based on several individual, local and global properties of trajectories. These trajectory features are selected from the literature and from interviews with experts. To validate the capacity of QF to capture perceived trajectory quality, we conduct an online experiment that demonstrates the high agreement between the automatic quality score and non-expert users. To further demonstrate the usefulness of QF, we use it in a data-free parameter tuning application able to tune any parametric microscopic crowd simulation model that outputs independent trajectories for characters. The learnt parameters for the tuned crowd motion model maintain the influence of the reference data which was used to weight the terms of QF.

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Kohn, Oliver, Julius Frenzel, Erkut Sarikaya e Matthias Weigold. "Virtuelle Prozesssimulation einer CNC-Maschine/Virtual process simulation of a CNC machine – Digital twin for stress-based payment models". wt Werkstattstechnik online 113, n. 01-02 (2023): 24–28. http://dx.doi.org/10.37544/1436-4980-2023-01-02-28.

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Innovative Ansätze bei der Prozessplanung und -optimierung mittels digitaler Zwillinge erfordern leistungsfähige Simulationen für Werkzeugmaschinen. Die Entwicklung einer solchen Simulation für ein 3-Achs-Vertikal-Bearbeitungszentrum wird hier als hybride Multi-Domain-Simulation in „Modelica“ implementiert und experimentell validiert. Dabei ist das Ziel die berechneten Kenngrößen im Kontext aktueller Entwicklungen, wie zum Beispiel belastungsorientierter Bezahlmodelle bereitzustellen. Innovative approaches to process planning and optimization using digital twins require powerful simulations for machine tools. The development of such a simulation for a 3-axis vertical machining center is presented here. The hybrid multi-domain simulation is implemented in ‚Modelica‘ and validated experimentally. The aim is to provide the calculated parameters in the context of current developments such as load-oriented payment models.

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Rahim, N. H. A., A. M. Kassim, M. F. Miskon, A. H. Azahar e H. Sakidin. "Optimization of One Legged Hopping Robot Hardware Parameters via Solidworks". Applied Mechanics and Materials 393 (settembre 2013): 544–49. http://dx.doi.org/10.4028/www.scientific.net/amm.393.544.

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This paper discussed about simulation of one legged hopping robot via Solidworks software in order to determine the optimum hardware parameters of the hopping robot. Simulations have been done according to different variables that have been set up earlier which are crank bar length, spring length and spring coefficient. The best parameters were chosen in terms of higher and stable hopping performance. Besides that, an experiment is done to validate the parameters from the simulation. Average hopping height is discussed and overall performances of hopping height stability are proved by the normal distribution graph. As the result, the optimum parameter values for hardware of one legged hopping robot are validated.

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Peniak, Peter, Karol Rástočný, Alžbeta Kanáliková e Emília Bubeníková. "Simulation of Virtual Redundant Sensor Models for Safety-Related Applications". Sensors 22, n. 3 (20 gennaio 2022): 778. http://dx.doi.org/10.3390/s22030778.

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Applications of safety-related control systems demand reliable and credible inputs from physical sensors, therefore there is a need to extend their capabilities to provide a validated input with high availability. Our main idea is to insert virtual sensors between physical sensors and the control system’s logic. The created solution can validate the values of real sensors and with the use of multiple virtual sensors we can achieve high availability in addition, therefore our solution is entitled as a virtual redundant sensor. It works by the digital twin’s concept and uses fusion function to calculate validated results. The fusion function is used to transform the measured values from the physical sensors according to designed numerical models. The selection of a numerical model with assigned fusion functions can be performed via the WEB-based graphical user interface. Proposal of the numerical model is created and validated on the experimental workplace with emulation of physical sensors and MQTT integration (smart IoT sensors). The results of testing have shown that our solution can be applied to validate the values of physical sensors. Proposed fusion functions calculated results according to the selected model in all cases, while non-standard cases were handled according to our definition. In addition, the high availability concept with a group of two virtual sensors has proven fast recovery and availability of results for safety-related applications as well.

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Beck, Margaret, e Jonathan Jaquette. "Validated Spectral Stability via Conjugate Points". SIAM Journal on Applied Dynamical Systems 21, n. 1 (25 gennaio 2022): 366–404. http://dx.doi.org/10.1137/21m1420095.

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Shavrina, Evgeniia, Vinh-Tan Nguyen, Zeng Yan e Boo Cheong Khoo. "Fluid-Solid Interaction Simulation Methodology for Coriolis Flowmeter Operation Analysis". Sensors 21, n. 23 (3 dicembre 2021): 8105. http://dx.doi.org/10.3390/s21238105.

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Numerical simulation is a widely used tool for Coriolis flowmeter (CFM) operation analysis. However, there is a lack of experimentally validated methodologies for the CFM simulation. Moreover, there is no consensus on suitable turbulence models and configuration simplifications. The present study intends to address these questions in a framework of a fluid-solid interaction simulation methodology by coupling the finite volume method and finite element method for fluid and solid domains, respectively. The Reynolds stresses (RSM) and eddy viscosity-based turbulence models are explored and compared for CFM simulations. The effects of different configuration simplifications are investigated. It is demonstrated that the RSM model is favorable for the CFM operation simulations. It is also shown that the configuration simplifications should not include the braces neglect or the equivalent flowmeter tube length assumption. The simulation results are validated by earlier experimental data, showing a less than 5% discrepancy. The proposed methodology will increase the confidence in CFM operation simulations and consequently provide the foundation for further studies of flowmeter usage in various fields.

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van der Vegte, Wilhelm Frederik, e Imre Horváth. "Achieving Closed-Loop Control Simulation of Human-Artefact Interaction: A Comparative Review". Modelling and Simulation in Engineering 2011 (2011): 1–16. http://dx.doi.org/10.1155/2011/675405.

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To include user interactions in simulations of product use, the most common approach is to couple human subjects to simulation models, using hardware interfaces to close the simulation-control loop. Testing with virtual human models could offer a low-cost addition to evaluation with human subjects. This paper explores the possibilities for coupling human and artefact models to achieve fully software-based interaction simulations. We have critically reviewed existing partial solutions to simulate or execute control (both human control and product-embedded control) and compared solutions from literature with a proof-of-concept we have recently developed. Our concept closes all loops, but it does not rely on validated algorithms to predict human decision making and low-level human motor control. For low-level control, validated solutions are available from other approaches. For human decision making, however, validated algorithms exist only to predict the timing but not the reasoning behind it. To identify decision-making schemes beyond what designers can conjecture, testing with human subjects remains indispensable.

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Montecchiari, Gabriele, Gabriele Bulian e Paolo Gallina. "Towards real-time human participation in virtual evacuation through a validated simulation tool". Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability 232, n. 5 (4 maggio 2017): 476–90. http://dx.doi.org/10.1177/1748006x17705046.

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The analysis of the ship layout from the point of view of safe and orderly evacuation represents an important step in ship design, which can be carried out through agent-based evacuation simulation tools, typically run in batch mode. Introducing the possibility for humans to interactively participate in a simulated evacuation process together with computer-controlled agents can open a series of interesting possibilities for design, research and development. To this aim, this article presents the development of a validated agent-based evacuation simulation tool which allows real-time human participation through immersive virtual reality. The main characteristics of the underlying social-force-based modelling technique are described. The tool is verified and validated by making reference to International Maritime Organization test cases, experimental data and FDS + Evac simulations. The first approach for supporting real-time human participation is then presented. An initial experiment embedding immersive virtual reality human participation is described, together with outcomes regarding comparisons between human-controlled avatars and computer-controlled agents. Results from this initial testing are encouraging in pursuing the use of virtual reality as a tool to obtain information on human behaviour during evacuation.

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Mondol, J. D., Y. G. Yohanis, M. Smyth e B. Norton. "Long-term validated simulation of a building integrated photovoltaic system". Solar Energy 78, n. 2 (febbraio 2005): 163–76. http://dx.doi.org/10.1016/j.solener.2004.04.021.

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Park, Danielle J., Elnaz Norouzi e Chanwoo Park. "Experimentally-validated computational simulation of direct contact membrane distillation performance". International Journal of Heat and Mass Transfer 129 (febbraio 2019): 1031–42. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.10.035.

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Wagoum, Armel Ulrich Kemloh, Mohcine Chraibi, Jonas Mehlich, Armin Seyfried e Andreas Schadschneider. "Efficient and validated simulation of crowds for an evacuation assistant". Computer Animation and Virtual Worlds 23, n. 1 (febbraio 2012): 3–15. http://dx.doi.org/10.1002/cav.1420.

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Galan, Ulises, e Henry A. Sodano. "Adhesive Energy of Zinc Oxide and Graphite, Molecular Dynamics and Atomic Force Microscopy Study". MRS Proceedings 1479 (2012): 89–94. http://dx.doi.org/10.1557/opl.2012.1603.

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AbstractMolecular Dynamics (MD) simulations are performed to calculate the interfacial energy between zinc oxide (ZnO) and graphitic carbon for the study of solid–solid adhesion. The MD model consists of a ZnO slab and a single layer of graphitic carbon. The calculation was validated experimentally by atomic force microscopy (AFM) liftoff. A polishing process was applied to create a tip with a flat surface that was subsequently coated with a ZnO film allowing force displacement measurement on Highly Oriented Pyrolitic Graphite to validate the simulations. The MD simulation and AFM lift-off show good agreement with adhesive energies of 0.303 J/m2 and 0.261 ± 0.054 J/m2, respectively.

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Fang, Chao, Biao-hua Cai, Shi-hua Ma e Bin Li. "Simulation and Experimental Study on Flow and Heat Transfer of Ship Central Cooling System". MATEC Web of Conferences 213 (2018): 04001. http://dx.doi.org/10.1051/matecconf/201821304001.

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The centralized cooling system of a certain type of oil ship is a large-scale complex fluid network system. Fluid system simulation software (FLOWMASTER) was used to establish simulation model for steady operating conditions. The design of central cooling system was validated reasonably by simulation in steady-state condition. In this paper, the flow and heat transfer experiment was carried out. The experimental results were in good agreement with the simulation results, which suggested that using FLOWMASTER to validate the heat transfer performance of fluid system is reliable.

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Mamutov, Viatcheslav S., e Alexander V. Mamutov. "Numerical simulation of electrohydraulic processes". MATEC Web of Conferences 245 (2018): 09015. http://dx.doi.org/10.1051/matecconf/201824509015.

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Using the finite element software complex LS-DYNA 971, the technique of simulating processes of Electro-Hydraulic forming is developed. The law of energy deposition is obtained from semi-analytical calculation. A simulation of complex EHF process, which includes discharge chamber with electrodes, plasma channel, water, deformable blank that is formed into a rigid die, is performed using the developed technique. The simulation is validated by experimental results. The developed technique significantly extends practical usage of numerical simulation of electrohydraulic forming and other electrohydraulic-based technologies.

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Du, Pengfei, Xi Zhao, Zhidong Zhang, Xiaoyan Sun e Gang Du. "Digital Twin-Based Numerical Simulation Method for Cee-Shape Cold-Formed Steel Members". Buildings 13, n. 9 (20 settembre 2023): 2388. http://dx.doi.org/10.3390/buildings13092388.

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Cold-formed steel (CFS) structures are widely used in construction and infrastructure due to their lightweight and high-strength properties. However, their thin-walled nature makes them geometrically sensitive to compressive loading. The Digital Twin (DT)-based numerical simulation method is developed using the actual geometries of CFS shapes, which are acquired by a 3D laser scanner. The DT-based numerical simulation incorporates the reconstructed measurement point clouds into the finite element modeling, ensuring that actual geometric features are retained. A series of tests, including material and axial compression testing, are conducted to validate the modeling parameters, such as mesh sizes and boundary conditions. The advantages of the DT-based numerical simulation method are highlighted compared to the traditional CFS member numerical simulation, which incorporates only the first mode of geometric imperfection. Additionally, DT-based numerical simulations offer more accurate load capacities and deformation predictions. Moreover, the automated and validated DT-based numerical simulation demonstrates prevalence in modeling efficiency and computation effectiveness. The DT-based numerical simulation method holds potential for application in smart structural analysis, where accurate geometries derived from extensive measurement point clouds are integrated into numerical modeling.

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Olejnik, Aleksander, Adam Dziubiński e Łukasz Kiszkowiak. "CFD simulation of empty fuel tanks separation from a trainer jet". Aircraft Engineering and Aerospace Technology 92, n. 10 (7 agosto 2020): 1459–68. http://dx.doi.org/10.1108/aeat-12-2019-0247.

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Purpose This study aims to create 6-degree of freedom (SDOF) for computational fluid dynamics (CFD) simulations of body movement, and to validate using the experimental data for empty tank separation from I-22 Iryda jet trainer. The procedure has an ability to be modified or extended, to simulate, for example, a sequential release from the joints. Design/methodology/approach A set of CFD simulations are calculated. Both the SDOF procedure and the CFD simulation settings are validated using the wind tunnel data available for the aircraft. Findings The simulation using designed procedure gives predictable results, but offers availability to be modified to represent external forces, i.e. from body interaction or control system without necessity to model the control surfaces. Practical implications The procedure could be used to model the separation of external stores and design the deployment of anti-radar chaff, flares or ejection seats. Originality/value The work presents original work, caused by insufficient abilities of original SDOF procedure in ANSYS code. Additional value is the ability of the procedure to be easily modified.

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Chaudhari, Ashvinkumar, Antti Hellsten e Jari Hämäläinen. "Full-Scale Experimental Validation of Large-Eddy Simulation of Wind Flows over Complex Terrain: The Bolund Hill". Advances in Meteorology 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/9232759.

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Numerical simulation of local atmospheric flows around a complex topography is important for many wind energy applications, as it can help in locating and optimizing wind farms. The aim of this paper is to simulate the atmospheric flows over the challenging and complex site of Bolund Hill (in Denmark) using Large-Eddy Simulations (LES) and to validate the simulation methodology against full-scale measurements. Wind prediction over a potential inland wind park is the main application of the validated LES methodology. For the first time, LES-based results from more than one wind direction of the Bolund case are reported and analyzed in detail herein. The LES results from each direction are compared with the Bolund field data in a quantitative way, for example, by using simulation error. According to the results comparison, it is found that the LES model provides by far the most accurate prediction for turbulent kinetic energy. The simulation error of this LES model for predicting turbulent kinetic energy is 19% smaller than that of all other models, whether experimental or numerical, employed previously over Bolund Hill.

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Pandey, Shirish, S. Hasan Saeed e N. R. Kidwai. "Simulation and optimization of genetic algorithm-artificial neural network based air quality estimator". Indonesian Journal of Electrical Engineering and Computer Science 19, n. 2 (1 agosto 2020): 775. http://dx.doi.org/10.11591/ijeecs.v19.i2.pp775-783.

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In this work intelligent model for estimation of the concentration of carbon monoxide in a polluted environment is developed on mat Lab platform. The results are validated using data collected from repository linked to University of California. The data records are over the duration of one year using E nose sensor placed in main city of Italy. The records are rectified and segmented at different length to extract the Base and Divergence Values features. An Artificial Neural Network Model (ANN) is developed and the result is validated manually. Another optimized Genetic Algorithm-Artificial Neural Network based air quality estimation model is developed which validate the result using artificial intelligence technique to get a better performance network.

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Feng, Zhi Gang, Qi Wang e K. Shida. "Validated Uncertainty Evaluation for Self-Validating Sensor". Key Engineering Materials 381-382 (giugno 2008): 419–22. http://dx.doi.org/10.4028/www.scientific.net/kem.381-382.419.

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This paper evaluates the validated uncertainty in SEVA sensor by integrating fault detection, identification and reconstruction (FDIR) and reliability engineering. The impact of each fault mode on measurement quality is evaluated quantitatively by using a priori sensor reliability information to investigate the impact of incomplete fault coverage, FDIR and manual maintenance intervention. Bayesian probabilistic approach and uncertainty calculus are employed to model the impact of sensor validation on parameter uncertainty and to fuse the individual modes into a complete sensor model. A simulation of SEVA pressure sensor example illustrates the concept and conclusions.

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Ghammraoui, Bahaa, Katsuyuki Taguchi e Stephen J. Glick. "Inclusion of a GaAs detector model in the Photon Counting Toolkit software for the study of breast imaging systems". PLOS ONE 18, n. 6 (8 giugno 2023): e0270387. http://dx.doi.org/10.1371/journal.pone.0270387.

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We present an upgraded version of the Photon Counting Toolkit (PcTK), a freely available by request MATLAB tool for the simulation of semiconductor-based photon counting detectors (PCD), which has been extended and validated to account for gallium arsenide (GaAs)-based PCD(s). The modified PcTK version was validated by performing simulations and acquiring experimental data for three different cases. The LAMBDA 60 K module planar detector (X-Spectrum GmbH, Germany) based on the Medipix3 ASIC technology was used in all cases. This detector has a 500-μm thick GaAs sensor and a 256 × 256-pixel array with 55 μm pixel size. The first validation was a comparison between simulated and measured spectra from a 109Cd radionuclide source. In the second validation study, experimental measurements and simulations of mammography spectra were generated to observe the performance of the GaAs version of the PcTK with polychromatic radiation used in conventional x-ray imaging systems. The third validation study used single event analysis to validate the spatio-energetic model of the extended PcTK version. Overall, the software provided a good agreement between simulated and experimental data, validating the accuracy of the GaAs model. The software could be an attractive tool for accurate simulation of breast imaging modalities relying on photon counting detectors and therefore could assist in their characterization and optimization.

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Lin, James C., e Robert L. Graney. "Combining Computer Simulation with Physical Simulation: An Attempt to Validate Turf Runoff Models". Weed Technology 6, n. 3 (settembre 1992): 688–95. http://dx.doi.org/10.1017/s0890037x0003606x.

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Predicting the off-target movement of agrochemicals applied to turf is an essential component for assessing risk to aquatic environments. For surface transport, a fully validated model does not exist. Such a model is required to make cost effective risk assessments and regulatory evaluations. To address this deficiency, a turf model validation program is outlined in this paper. The effect of turf characteristics on the fate and movement of pesticides is presented followed by the discussion of the selection for a proper turf runoff model. The design and implementation of small plot runoff studies and their usefulness in model validation are discussed. The procedures of model calibration and model verification are explained for model validation purpose.

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Ostras, Oleksii, Igor Shponka e Gianmarco Pinton. "Relating lung pathology to ultrasound imaging: An experimentally validated simulation approach". Journal of the Acoustical Society of America 151, n. 4 (aprile 2022): A75—A76. http://dx.doi.org/10.1121/10.0010705.

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Lung ultrasound (LUS) imaging can be highly sensitive to disease. However, lung imaging depends on reverberation that occurs at the lung interface, which is complex and upends the conventional time-space relationship in delay-and-sum beamforming resulting in images that require the interpretation of artifacts. Establishing a clear link between ultrasound images and underlying alveolar or fibrotic state of the lung could improve the diagnostic accuracy and clinical deployment of lung ultrasound and potentially establish LUS as a gold-standard imaging modality. Here, it is shown how histology-derived acoustical maps of the lung, Visible Human maps of the abdomen, and Fullwave simulations of ultrasound propagation can accurately model the multiple scattering physics at the lung interface. Lung B-mode images are generated based on the first principles of propagation and multiple scattering and they are compared to clinical imaging. In silico modifications of the aeration/porosity and the fluid-to-tissue ratio in the lung parenchyma are related to the corresponding changes in B-mode images. Additionally, the patterns of superficial/subpleural air inclusions were analyzed and mapped to corresponding B-mode image markers (white lung, single and multiple B-lines, A-lines). This establishes a validated framework for quantitative imaging of lung disease and the development of LUS-specific beamforming.

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Hsu, Timothy, e Jonathan Dessi-Olive. "Simulation-validated generative design of acoustical arrays with diffusion and absorption". Journal of the Acoustical Society of America 148, n. 4 (ottobre 2020): 2798. http://dx.doi.org/10.1121/1.5147792.

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Petersen, Lars Norbert, Niels Kjølstad Poulsen, Hans Henrik Niemann, Christer Utzen e John Bagterp Jørgensen. "An experimentally validated simulation model for a four-stage spray dryer". Journal of Process Control 57 (settembre 2017): 50–65. http://dx.doi.org/10.1016/j.jprocont.2017.05.001.

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Ryckbosch, Frederick, Stijn Polfliet e Lieven Eeckhout. "Fast, Accurate, and Validated Full-System Software Simulation of x86 Hardware". IEEE Micro 30, n. 6 (novembre 2010): 46–56. http://dx.doi.org/10.1109/mm.2010.95.

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Seuffert, Martin, e Eva Gundelsheimer. "Validated Simulation of a Sandwich Roof in a Crash Load Case". Lightweight Design worldwide 11, n. 4 (agosto 2018): 48–53. http://dx.doi.org/10.1007/s41777-018-0032-x.

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Dalponte, D., P. Rinaldi, G. Cazenave, E. Usunoff, L. Vives, M. Varni, M. Vénere e A. Clausse. "A validated fast algorithm for simulation of flooding events in plains". Hydrological Processes 21, n. 8 (2007): 1115–24. http://dx.doi.org/10.1002/hyp.6301.

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Lyu, Zheng, Krithin Kripakaran, Max Furth, Eric Tang, Brian Wandell e Joyce Farrell. "Validation of image systems simulation technology using a Cornell Box". Electronic Imaging 2021, n. 7 (18 gennaio 2021): 122–1. http://dx.doi.org/10.2352/issn.2470-1173.2021.7.iss-122.

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We describe and experimentally validate an end-to-end simulation of a digital camera. The simulation models the spectral radiance of 3D-scenes, formation of the spectral irradiance by multi-element optics, and conversion of the irradiance to digital values by the image sensor. We quantify the accuracy of the simulation by comparing real and simulated images of a precisely constructed, three-dimensional high dynamic range test scene. Validated end-to-end software simulation of a digital camera can accelerate innovation by reducing many of the time-consuming and expensive steps in designing, building and evaluating image systems.

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Wang, Jing Yu, Xing Jun Hu, Ying Chao Zhang e Bo Yang. "Research of Aerodynamic Characteristics about Minibus". Applied Mechanics and Materials 97-98 (settembre 2011): 752–55. http://dx.doi.org/10.4028/www.scientific.net/amm.97-98.752.

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To research the aerodynamic characteristics of minibus, the simplified model is studied with simulation and wind tunnel test. The validated method was adopted in the numerical simulation, the wind tunnel test were carried out in order to validate the results of numerical simulation. The tests include aerodynamic drag measure, filament method, and laser flow visualization. Through the contrasted research the results of simulation and test, the aerodynamic characteristics of minibus was analyzed and the characteristic of field around minibus was discovered. The conclusions provide the theoretical foundation for styling optimization of minibus, which are very helpful to develop new vehicle styling.

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Yassin, Khaled, Stephan Kelm, Manohar Kampili e Ernst-Arndt Reinecke. "Validation and Verification of containmentFOAM CFD Simulations in Hydrogen Safety". Energies 16, n. 16 (15 agosto 2023): 5993. http://dx.doi.org/10.3390/en16165993.

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As the applications of hydrogen as a replacement for fossil fuels and energy storage increase, more concerns have been raised regarding its safe usage. Hydrogen’s extreme physical properties—its lower flammability limit (LFL), for instance—represent a challenge to simulating hydrogen leakage and, hence, mitigating accidents that occur due to such leakage. In this work, the OpenFOAM-based CFD simulation package containmentFOAM was validated by different experimental results. As in its original use, to simulate nuclear safety issues, the containmentFOAM package is capable of capturing different phenomena, like buoyant gas clouds and diffusion between gases and air. Despite being widely validated in nuclear safety, this CFD package was assessed with benchmark experiments used to validate hydrogen leakage scenarios. The validation cases were selected to cover different phenomena that occur during the hydrogen leakage—high-speed jet leakage, for example. These validation cases were the hallway with vent, FLAME, and GAMELAN experiments. From the comparison of the experimental and simulation results, we concluded that the containmentFOAM package showed good consistency with the experimental results and, hence, that it can be used to simulate actual leakage cases.

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Doudican, Nicole A., Shireen Vali, Shweta Kapoor, Anay Talawdekar, Zeba Sultana, Aftab Alam, Ansu Kumar et al. "Ex Vivo Patient-Specific Validation Of Personalized Therapeutic Designed For Multiple Myeloma". Blood 122, n. 21 (15 novembre 2013): 4219. http://dx.doi.org/10.1182/blood.v122.21.4219.4219.

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Abstract Background The unique signature of a patient’s tumor mandates the need to rationally design personalized therapies employing N=1 segmentation conceptually. Repurposing of existing drug agents with validated clinical safety and pharmacokinetics data provides a rapid translational path to clinic which otherwise would require years of development time and associated new chemical risks. By focusing on rationally designed personalized treatment mechanisms, our strategy targets multiple key pathways to address the clinical problem of emergence of single therapy resistance. In order to overcome MM resistance, we have (1) employed predictive simulation modeling based upon patient genetic and environment profiling to design patient context specific combinatorial therapeutic regimens using library of drug agents from across indications with prior clinical data and (2) validating designed therapy ex-vivo in patient derived cell lines. Methods Clinical patient samples were analyzed for chromosome evaluation and molecular cytogenetic analysis by NYU. Using this information, an in silico simulation avatar of the patient was created. To identify effective personalized therapeutics, we focused our study on compounds from the National Center for Advanced Translational Science (NCATS) and other molecularly targeted agents. The predictive simulation based approach from Cellworks provides a comprehensive representation of MM disease physiology incorporating signaling and metabolic networks with an integrated phenotype view. This extensively validated simulation model predicts clinical outcomes with phenotype and bio-marker assays. Hits were shortlisted from over thousand pharmacodynamic dose-response simulation studies using criteria of efficacy and synergy. Computer modeling predicted that therapeutic combination mechanistically targets apoptotic pathways and the combination of the agents provides greater than additive activity. These predictive findings are in the process of being assessed ex vivo and retrospectively validated. Results The analysis detected loss of chromosome 13 signal consistent with monosomy 13 and loss of TP53 signal consistent with deletion of TP53; all other probes contained normal signal patterns. The shortlisted therapeutic combination identified from predictive simulation-based screening was BEZ235 (PI3K/mTOR inhibitor) and ABT-199 (BCL2 inhibitor). IC30 concentrations of the single agents resulted in a 56% inhibition of proliferation and 49% inhibition of viability in predictive simulations. The apoptotic markers CASP3, CASP9, Cleaved-PARP1 and BAK1 increased by 74% (1.75 fold), 132% (2.32 fold), 81% (1.8 fold), 217% (3.17 fold), respectively. The proposed mechanism of action using simulation model identified the p53 deletion as responsible for increased BCL2 activity and levels of activated AKT. Deletion of p53 increased levels of activated AKT via decreases in PTEN and IGFBP3. Hence, a mechanism that targets the PI3K/AKT/mTOR and BCL2 family showed efficacy in the simulation avatar of the patient and are currently being validated ex-vivo in patient cells. Conclusions This study demonstrates and validates simulation approaches and technologies to leverage big data from patient genomic analysis to create a simulation avatar for rational design of personalized therapeutics. This level of personalization, beyond linking point mutations to associated drugs targeting the same mutations, truly incorporates the broad patient tumor signature in translational path forward. Disclosures: No relevant conflicts of interest to declare.

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Pellegrino, Mattia, Gianfranco Lombardo, Stefano Cagnoni e Agostino Poggi. "High-Performance Computing and ABMS for High-Resolution COVID-19 Spreading Simulation". Future Internet 14, n. 3 (11 marzo 2022): 83. http://dx.doi.org/10.3390/fi14030083.

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This paper presents an approach for the modeling and the simulation of the spreading of COVID-19 based on agent-based modeling and simulation (ABMS). Our goal is not only to support large-scale simulations but also to increase the simulation resolution. Moreover, we do not assume an underlying network of contacts, and the person-to-person contacts responsible for the spreading are modeled as a function of the geographical distance among the individuals. In particular, we defined a commuting mechanism combining radiation-based and gravity-based models and we exploited the commuting properties at different resolution levels (municipalities and provinces). Finally, we exploited the high-performance computing (HPC) facilities to simulate millions of concurrent agents, each mapping the individual’s behavior. To do such simulations, we developed a spreading simulator and validated it through the simulation of the spreading in two of the most populated Italian regions: Lombardy and Emilia-Romagna. Our main achievement consists of the effective modeling of 10 million of concurrent agents, each one mapping an individual behavior with a high-resolution in terms of social contacts, mobility and contribution to the virus spreading. Moreover, we analyzed the forecasting ability of our framework to predict the number of infections being initialized with only a few days of real data. We validated our model with the statistical data coming from the serological analysis conducted in Lombardy, and our model makes a smaller error than other state of the art models with a final root mean squared error equal to 56,009 simulating the entire first pandemic wave in spring 2020. On the other hand, for the Emilia-Romagna region, we simulated the second pandemic wave during autumn 2020, and we reached a final RMSE equal to 10,730.11.

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Benavides-Córdoba, Santiago, Anamaría Romero-Carvajal, Nicolas Muñoz-Galeano, Juan Bernardo Cano-Quintero e Jesús María López-Lezama. "Deduction and Application of the Average Switch Model in Power Electronic Devices for Simulation Time Reduction". Ingeniería 29, n. 1 (17 gennaio 2024): e21303. http://dx.doi.org/10.14483/23448393.21303.

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Context: Time is a crucial issue in the simulation of power electronics (PE) devices, even more when these elements are integrated into microgrids.Method: This paper deals with the deduction of the average switch model for PE devices with the purpose of reducing simulation times. For doing this, the average model is only applied over the power switches of PE devices, not being applied over the complete topology as traditionally done. The proposed average model switch permits eliminating the ripple of voltage and currents but keeping the transient of the signals. The average model switch is derived for Boost and Buck converter switches and then generalized to power inverter switches. The proposed approach is validated using OpenModelica software.Results: A system featuring a battery, a DC/DC converter, and an inverter connected to the power grid was simulated. A comparison was performed between a simulation that considers the power switches and a simulation that uses the proposed average model switch, the time simulation was reduced up to 99.788 %, which validates the proposed approach.Conclusions: The proposed average switch model significantly reduces simulation times. This method offers a promising way to streamline power electronics device simulations, particularly in the context of microgrids and other applications where time efficiency is critical.

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Hemez, François, H. Sezer Atamturktur e Cetin Unal. "Defining predictive maturity for validated numerical simulations". Computers & Structures 88, n. 7-8 (aprile 2010): 497–505. http://dx.doi.org/10.1016/j.compstruc.2010.01.005.

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Pienika, Rodolfo, Gabriel Usera e Helena Ramos. "Simulation of a Hydrostatic Pressure Machine with Caffa3d Solver: Numerical Model Characterization and Evaluation". Water 12, n. 9 (28 agosto 2020): 2419. http://dx.doi.org/10.3390/w12092419.

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The Hydrostatic Pressure Machine (HPM) is a novel energy converter for micro and pico hydropower that becomes very suitable for installation in channels with very low head, where conventional hydraulic turbines are inadequate or too expensive. Although this technology has been studied through several experimental tests and also by numerical simulations, open source flow solvers have not been used yet. The research team on Computational Fluid Mechanics of IMFIA- Universidad de la República (Uruguay) has been developing a CFD open source solver named caffa3d, which has obtained great results in a few international challenges, although it has not been used yet for free surface flows or turbomachinery simulations. The present work shows the contributions made within caffa3d in order to enable its use for simulating a HPM. The Large Eddy Simulation (LES) method is used to model the turbulence structures of the flow. Sliding Mesh (SM) and Volume of Fluid (VOF) methods were chosen respectively to resolve the rotation of the wheel and the position of the free surface. The SM module was already validated in the past, but the VOF module needed to be validated in the present work through the simulation of free surface over a semicylindrical dam. Finally, the performance of a small 12-straight-blade HPM was simulated with caffa3d, with quite satisfactory results. Some issues of the solver yet need to be solved before other HPM with more complex designs could be studied.

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