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Статті в журналах з теми "0D-1D simulation"
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Simakov, Sergey S. "Spatially averaged haemodynamic models for different parts of cardiovascular system." Russian Journal of Numerical Analysis and Mathematical Modelling 35, no. 5 (October 27, 2020): 285–94. http://dx.doi.org/10.1515/rnam-2020-0024.
Повний текст джерелаАнотація:
AbstractThis paper revisits the usage of spatially averaged haemodynamic models such as non-stationary 1D/0D in space and stationary 0D in space models. Conditions of equivalence between different 1D model formulations are considered. The impact of circular and elliptic shapes of the tube cross-section on the friction term and the tube law is analyzed. Finally, the relationship between 0D lumped and 1D models is revealed.
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Alastruey, Jordi, Nan Xiao, Henry Fok, Tobias Schaeffter, and C. Alberto Figueroa. "On the impact of modelling assumptions in multi-scale, subject-specific models of aortic haemodynamics." Journal of The Royal Society Interface 13, no. 119 (June 2016): 20160073. http://dx.doi.org/10.1098/rsif.2016.0073.
Повний текст джерелаАнотація:
Simulation of haemodynamics has become increasingly popular within the research community. Irrespective of the modelling approach (zero-dimensional (0D), one-dimensional (1D) or three-dimensional (3D)), in vivo measurements are required to personalize the arterial geometry, material properties and boundary conditions of the computational model. Limitations in in vivo data acquisition often result in insufficient information to determine all model parameters and, hence, arbitrary modelling assumptions. Our goal was to minimize and understand the impact of modelling assumptions on the simulated blood pressure, flow and luminal area waveforms by studying a small region of the systemic vasculature—the upper aorta—and acquiring a rich array of non-invasive magnetic resonance imaging and tonometry data from a young healthy volunteer. We first investigated the effect of different modelling assumptions for boundary conditions and material parameters in a 1D/0D simulation framework. Strategies were implemented to mitigate the impact of inconsistencies in the in vivo data. Average relative errors smaller than 7% were achieved between simulated and in vivo waveforms. Similar results were obtained in a 3D/0D simulation framework using the same inflow and outflow boundary conditions and consistent geometrical and mechanical properties. We demonstrated that accurate subject-specific 1D/0D and 3D/0D models of aortic haemodynamics can be obtained using non-invasive clinical data while minimizing the number of arbitrary modelling decisions.
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Naidis, G. V., and N. Yu Babaeva. "Low-pressure CO2 discharges: 1D modeling." Physics of Plasmas 30, no. 1 (January 2023): 013506. http://dx.doi.org/10.1063/5.0130672.
Повний текст джерелаАнотація:
A 1D model of glow low-pressure CO2 discharges is developed. In the framework of this model, simulation of stationary and repetitively pulsed discharges at pressure ranging from 0.5 to 5 Torr and current from 10 to 50 mA is performed. The obtained plasma characteristics are compared with the available experimental results and with the data evaluated based on the approximate 0D approach. The results of 0D and 1D calculations agree for most of plasma parameters, except for the molar fraction of CO molecules produced at CO2 dissociation by electron impact. Agreement between the measured and calculated, in the framework of the 1D model, values of the CO molar fraction is provided by modifying the expression of the dissociation rate constant vs the reduced electric field.
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Echeverribar, Isabel, Pablo Vallés, Juan Mairal, and Pilar García-Navarro. "Efficient Reservoir Modelling for Flood Regulation in the Ebro River (Spain)." Water 13, no. 22 (November 9, 2021): 3160. http://dx.doi.org/10.3390/w13223160.
Повний текст джерелаАнотація:
The vast majority of reservoirs, although built for irrigation and water supply purposes, are also used as regulation tools during floods in river basins. Thus, the selection of the most suitable model when facing the simulation of a flood wave in a combination of river reach and reservoir is not direct and frequently some analysis of the proper system of equations and the number of solved flow velocity components is needed. In this work, a stretch of the Ebro River (Spain), which is the biggest river in Spain, is simulated solving the Shallow Water Equations (SWE). The simulation model covers the area of river between the city of Zaragoza and the Mequinenza dam. The domain encompasses 721.92 km2 with 221 km of river bed, of which the last 75 km belong to the Mequinenza reservoir. The results obtained from a one-dimensional (1D) model are validated comparing with those provided by a two-dimensional (2D) model based on the same numerical scheme and with measurements. The 1D modelling loses the detail of the floodplain, but nevertheless the computational consumption is much lower compared to the 2D model with a permissible loss of accuracy. Additionally, the particular nature of this reservoir might turn the 1D model into a more suitable option. An alternative technique is applied in order to model the reservoir globally by means of a volume balance (0D) model, coupled to the 1D model of the river (1D-0D model). The results obtained are similar to those provided by the full 1D model with an improvement on computational time. Finally, an automatic regulation is implemented by means of a Proportional-Integral-Derivative (PID) algorithm and tested in both the full 1D model and the 1D-0D model. The results show that the coupled model behaves correctly even when controlled by the automatic algorithm.
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YUHN, Changyoung, and Marie OSHIMA. "Effects of reducing 1D network complexity in a 1D–0D simulation of cerebral circulation." Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2019.32 (2019): 1A22. http://dx.doi.org/10.1299/jsmebio.2019.32.1a22.
Повний текст джерела
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Dilber, Viktor, Momir Sjerić, Rudolf Tomić, Josip Krajnović, Sara Ugrinić, and Darko Kozarac. "Optimization of Pre-Chamber Geometry and Operating Parameters in a Turbulent Jet Ignition Engine." Energies 15, no. 13 (June 28, 2022): 4758. http://dx.doi.org/10.3390/en15134758.
Повний текст джерелаАнотація:
A turbulent jet ignition engine enables operation with lean mixtures, decreasing nitrogen oxide (NOX) emissions up to 92%, while the engine efficiency can be increased compared to conventional spark-ignition engines. The geometry of the pre-chamber and engine operating parameters play the most important role in the performance of turbulent jet ignition engines and, therefore, must be optimized. The initial experimental and 3D CFD results of a single-cylinder engine fueled by gasoline were used for the calibration of a 0D/1D simulation model. The 0D/1D simulation model was upgraded to capture the effects of multiple flame propagations, and the evolution of the turbulence level was described by the new K-k-ε turbulence model, which considers the strong turbulent jets occurring in the main chamber. The optimization of the pre-chamber volume, the orifice diameter, the injected fuel mass in the pre-chamber and the spark timing was made over 9 different operating points covering the variation in engine speed and load with the objective of minimizing the fuel consumption while avoiding knock. Two optimization methods using 0D/1D simulations were presented: an individual optimization method for each operating point and a simultaneous optimization method over 9 operating points. It was found that the optimal pre-chamber volume at each operating point was around 5% of the clearance volume, while the favorable orifice diameters depended on engine load, with optimal values around 2.5 mm and 1.2 mm at stoichiometric mixtures and lean mixtures, respectively. Simultaneous optimization of the pre-chamber geometry for all considered operating points resulted in a pre-chamber volume equal to 5.14% of the clearance volume and an orifice diameter of 1.1 mm.
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Tretyakova, Rufina M., Gennady I. Lobov, and Gennady A. Bocharov. "Modelling lymph flow in the lymphatic system: from 0D to 1D spatial resolution." Mathematical Modelling of Natural Phenomena 13, no. 5 (2018): 45. http://dx.doi.org/10.1051/mmnp/2018044.
Повний текст джерелаАнотація:
In this study, we formulated a core mathematical model for describing the one-dimensional lymph flow in lymphatic vessels and branching network of lymphatic vessels. The 1D model was numerically implemented using the 1D haemodynamic modeling tools developed in T.M. Gamilov et al. and S. Simakov et al. [T.M. Gamilov et al., Transl. Med. 6 (2013) 5–13 and S. Simakov et al., Russian J. Numer. Anal. Math. Model. 28 (2013) 485–504]. The formulated model was calibrated using published data on lymph flow dynamics and other modelling studies of lymph flows. The comparison of 0D and 1D formulations of the lymph flow models is presented.
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Kovács, László, and Szilárd Szabó. "Test validated 0D/1D engine model of a swinging valve internal combustion engine." Multidiszciplináris tudományok 11, no. 4 (2021): 266–77. http://dx.doi.org/10.35925/j.multi.2021.4.31.
Повний текст джерелаАнотація:
In the quest for reaching ever higher power density of IC engines a much simpler solution has been investigated that allows vehicles to reach a comparable power level with cars equipped with turbo charged engines. The new Swinging Valve (SwV) arrangement enables the unhindered gas exchange process through an engine. In this experiment a flow bench was used to examine a normal poppet valve cylinder head and a cylinder head constructed for the same engine but with Swinging Valves. The flow parameters of the original cylinder head were obtained then the SwV head was investigated in the same way. To examine the practical use of a SwV system a 0D/1D engine simulation had been created, first using the engine with conventional cylinder head. That model had been validated with dynamometer tests. After this stage the results of the Swinging Valve flow measurements were fed in the same 0D/1D engine simulation then the results were compared and examined.
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Lebedev, Yuri A. "Microwave Discharges in Liquid Hydrocarbons: Physical and Chemical Characterization." Polymers 13, no. 11 (May 21, 2021): 1678. http://dx.doi.org/10.3390/polym13111678.
Повний текст джерелаАнотація:
Microwave discharges in dielectric liquids are a relatively new area of plasma physics and plasma application. This review cumulates results on microwave discharges in wide classes of liquid hydrocarbons (alkanes, cyclic and aromatic hydrocarbons). Methods of microwave plasma generation, composition of gas products and characteristics of solid carbonaceous products are described. Physical and chemical characteristics of discharge are analyzed on the basis of plasma diagnostics and 0D, 1D and 2D simulation.
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Najafi, M., and Z. Benjelloun-Dabaghi. "A New Modelica Model and Scicos Simulation for 0D/1D Nonlinear Complex Systems." Oil & Gas Science and Technology - Revue de l'IFP 63, no. 6 (November 2008): 723–36. http://dx.doi.org/10.2516/ogst:2008042.
Повний текст джерелаДисертації з теми "0D-1D simulation"
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VENTURELLI, MATTEO. "Modellazione numerica di sistemi complessi per la simulazione dell'efficienza energetica e dell'impatto ambientale dei processi industriali." Doctoral thesis, Università degli studi di Modena e Reggio Emilia, 2022. http://hdl.handle.net/11380/1270799.
Повний текст джерелаАнотація:
Oggetto del lavoro di tesi è lo sviluppo di metodologie numeriche per l’analisi delle prestazioni di sistemi e tecnologie che possono essere applicate a qualsiasi processo industriale per il miglioramento dell'efficienza energetica e la riduzione dell’impatto ambientale.
Lo studio si è focalizzato sull'implementazione di strumenti e modelli numerici specifici per indagare le prestazioni di sistemi/tecnologie che possono portare l'industria verso un settore prossimo ad impatto ambientale zero. L'ottimizzazione della soluzione, studiare la sua integrazione nei processi industriali esistenti e valutare la fattibilità economica sono alcuni degli obiettivi delle metodologie numeriche sviluppate.
I modelli numerici sviluppati in questo studio consentono di analizzare i benefici ottenuti dall'applicazione dei sistemi di recupero del calore di scarto (WHRS) nei processi industriali; il recupero del calore disperso nell'ambiente è una delle leve per migliorare l'efficienza energetica dei processi produttivi.
Lo studio si basa su due diverse metodologie numeriche: modellazione a parametri concentrati e distribuiti (0D/1D) e approccio CFD (analisi fluidodinamica computazionale -3D).
La tesi riporta anche una validazione numerico-sperimentale; infatti, i modelli numerici sono stati applicati a casi reali per testarne la loro affidabilità, confrontando i dati sperimentali con i risultati numerici.
Il primo approccio numerico, ovvero parametri concentrati e distribuiti, è stato utilizzato per sviluppare un modello che permette di simulare l'applicazione di un impianto di recupero di calore di scarto in un processo industriale; l'idea è di recuperare il calore contenuto nei gas emessi in atmosfera e di riutilizzare l'energia termica recuperata nei processi industriali. Di conseguenza, aumenta l'efficienza del processo e diminuiscono le emissioni di anidride carbonica.
La modellazione numerica 0D/1D consente di prevedere il comportamento fluidodinamico del sistema di recupero del calore e i benefici ottenuti da questa soluzione in termini di miglioramento dell'efficienza energetica e in termini di riduzione dell'impatto ambientale per il processo industriale.
Il modello 0D/1D comprende l'intero sistema di recupero del calore costituito dal circuito primario e secondario e da tutti i componenti principali (tubazioni, valvole, pompe ecc ecc…). Inoltre, è stata sviluppata una libreria specifica per la simulazione della strategia di controllo del sistema di recupero di calore di scarto.
Il modello numerico sviluppato è stato applicato ad un vero e proprio test case per analizzare l'applicazione del WHRS ad un processo industriale ceramico. Il WHRS è stato installato nello stabilimento situato nel distretto ceramico in Emilia Romagna e i dati sperimentali raccolti hanno dimostrato le capacità numeriche del modello.
La modellazione CFD, ovvero il secondo approccio, è stata applicata per studiare il comportamento fluidodinamico del singolo componente, ovvero il recuperatore di calore. Il modello numerico sviluppato fornisce il comportamento termico del sistema in termini di temperatura, pressione e distribuzione di velocità; è inoltre possibile stimare la potenza termica recuperata dall'unità.
A seconda delle dimensioni del sistema, possono essere prese in considerazione diverse strategie per la simulazione dei recuperatori di calore per ridurre la potenza computazionale richiesta dalla simulazione. In questo lavoro di ricerca vengono presentati due modelli numerici differenti.
Infine, viene presentato un modello numerico CFD per la simulazione del fenomeno del fouling negli scambiatori di calore. Viene utilizzato un modello multifase lagrangiano e nell'analisi vengono considerati i contatti delle particelle e la meccanica di adesione-rimbalzo.
I modelli numerici CFD implementati dimostrano di prevedere con precisione i risultati ottenuti sia con misurazioni su casi di test reali che con correlazioni teoriche.The objective of this thesis is the development of numerical methodologies for the accurate performance prediction of systems and technologies that can be applied to any industrial process for its energy efficiency enhancement and environmental footprint reduction. Numerical modelling of the complete energy systems can be a key design tool to investigate the potential solutions to improve the performance of the considered system. The aim of this research work is the implementation of specific tools and numerical models for investigating the performance of systems/technologies that can bring the industry towards a near-zero discharged sector. Analysing the solution optimization, studying the integration in the existing industrial processes and evaluating the economics of the design are some of the goals of the numerical methodologies developed. The numerical models of this thesis deal with analysis of the benefits gained by the application of waste heat recovery systems (WHRS) in industrial processes; the recovery of heat that is wasted into the environment is one of the levers to enhance the energy efficiency in industrial processes. The study relies on two different numerical approaches: lumped and distributed parameter modelling (0D/1D) and computational fluid dynamic approach (3D). The thesis encompasses also a numerical-experimental validation; indeed, the numerical models have been applied to real test cases to test the capabilities of the computational tools and the results have been compared with experimental data for the models’ validations. The first numerical approach, i.e. lumped and distributed parameter, has been used to develop a model that investigates the application of a WHRS in an industrial process; the idea is to recover the heat contained in the exhaust stream and to re-use the recovered thermal energy in the industrial processes in order to decrease their carbon emissions and increase process efficiencies. The transient 0D/1D numerical modelling is able to predict the fluid dynamic behaviour of the heat recovery system and the benefits gained by this solution in terms of energy efficiency enhancement and in terms of environmental impact reduction for the industrial process. The 0D/1D model includes the entire heat recovery system which consists of the primary and secondary circuit, and all the main components (piping, valves, pumps etc etc…). In addition to this, a specific library has been developed for the simulation of the control strategy of the WHRS. The numerical model developed has been applied to a real test case for investigating the application of the WHRS to a ceramic industrial process. The WHRS has been physically installed in the ceramic facility located in the ceramic district of Emilia Romagna and the experimental data gathered in this test case demonstrated the numerical capabilities of the model. The CFD modelling, i.e., second approach, has been applied for investigating the fluid dynamic behavior of the single component, i.e., heat recovery unit. The numerical model developed provides the thermal behavior of the system in terms of temperature, pressure, and velocity distribution; the thermal power recovered by the unit can be also estimated. Depending on the size of the system, different strategies for the simulation of the heat recovery units can be considered to decrease the computational effort of the simulation. In this research work, two numerical models are presented. Finally, a CFD numerical model for the simulation of the fouling phenomenon in heat exchangers is presented. A Lagrangian multiphase model is used, and the particle contacts and the sticking-rebound mechanics are considered in the analysis. The implemented CFD numerical models demonstrate to predict accurately the results obtained with both measurements on real test cases and theoretical correlations.
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LAMY, FRANCOIS. "Degradation bacterienne de la matiere organique en milieu marin : simulation au site eumeli oligotrophe avec un modele 1d - assimilation de donnees experimentales dans un modele 0d." Aix-Marseille 2, 1997. http://www.theses.fr/1997AIX22100.
Повний текст джерелаАнотація:
Ce travail a ete realise dans le cadre du programme jgofs (joint global flux studies) dont le but est de determiner si l'ocean est capable d'absorber le co#2 produit par l'activite humaine. Au sein de cette problematique, les modeles globaux sont necessaires pour quantifier les flux de carbone entre l'atmosphere et l'ocean, et pour etudier les nombreux couplages entre les processus physiques, chimiques et biologiques controlant ces flux. Cependant, ces modeles globaux ne sont pas adaptes pour etudier chaque sous-systeme du systeme ocean. En particulier, le sous-systeme bacterien, dont le role est primordial dans la sequestration du carbone par l'ocean et les sediments, necessite un travail specifique. Le but final de cette etude est donc de definir un modele bacterien qui sera integre dans un modele global. Pour nous affranchir des couplages avec la physique et les autres sous-systemes biologiques, nous avons etudie les processus bacteriens a partir d'experiences de biodegradation effectuees sur des echantillons d'eau de mer. Dans ce travail, nous avons adapte l'assimilation de donnees a la biologie experimentale pour determiner les parametres bacteriens et caracteriser la matiere organique presente dans chaque echantillon. De plus, nous avons developpe une demarche statistique globale pour analyser et comparer les solutions obtenues par assimilations. La comparaison des solutions obtenues a partir d'un echantillon permet de detecter les erreurs liees au modele, a une mauvaise interpretation des mesures, ou au sous-echantillonnage. La comparaison de solutions obtenues a partir d'echantillons differents permet d'apprehender la variabilite biologique des parametres bacteriens. Cette demarche statistique globale est indispensable pour integrer les resultats obtenus a partir d'echantillons dans le cadre plus global de l'etude des cycles biogeochimiques dans l'ocean.
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KHESHTINEJAD, HAMED. "Investigation Into Advanced Architecture and Strategies For Turbocharged Compressed Natural Gas Heavy Duty SI-engine." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2689169.
Повний текст джерелаАнотація:
CNG is at present retaining a growing interest as a factual alternative to traditional fuel for SI engine thanks to its high potentials in reducing the engine-out emissions. Increasing thrust into the exploitation of NG in the transport field is in fact produced by the even more stringent emission regulations which are being introduced into the worldwide scenario. Specific attention is also to be devoted to heavy duty engines given the high impact they retain due to the diesel oil exploitation and to the PM emissions, the latter issue assessing for the need to shift towards alternative fuels such as natural gas. A thorough control of the air-to-fuel ratio appears to be mandatory in spark ignition CNG engines in order to meet the even more stringent thresholds set by the current regulations. The accuracy of the air/fuel mixture highly depends on the injection system dynamic behavior and to its coupling to the engine fluid-dynamic. The amount of injected fuel should in fact be properly targeted by the ECU basing on the estimation of the induced air and accounting for the embedded closed-loop strategies. Still, these latter are normally derived from engine-base routines and totally ignore the injection system dynamics. Thus, a sound investigation into the mixing process can only be achieved provided that a proper analysis of the injection rail and of the injectors is carried out.
The first part of the present work carries out a numerical investigation into the fluid dynamic behavior of a commercial CNG injection system by means of a 0D-1D code. The research has been focused on defining the set of parameters to be precisely reproduced in the 0D-1D simulation so as to match the injection system experimental behavior. Specific attention has been paid to the one component which significantly contributes to fully defining its dynamic response, i.e. the pressure reducing valve. The pressure reducer is made up of various elements that retain diverse weights on the valve behavior and should consequently be differently addressed to. A refined model of the pressure reducer has hence been proposed and the model has been calibrated, tested and run under various operating conditions so as to assess for the set-up validity. Comparisons have been carried out on steady state points as well as through out a vehicle driving cycle and the model capability to properly reproduce the real system characteristic has been investigated into. The proposed valve model has proved to consistently replicate the injection system response for different speed and load conditions. A few methodological indications concerning modeling aspects of a pressure regulator can be drawn from the present study. The model has been run in a predictive mode so as to inquiry into the response of the system to fast transient operations, both in terms of speed and load. The model outputs have highlighted mismatches between the ECU target mass and the actually injected one and have hinted at the need for dedicated and refined control strategies capable of preventing anomalies in the mixture formation and hence in the engine functioning.
The second part of the present work aims at deeply investigating into the potentials of a heavy duty engine running on CNG and equipped with two different injection systems, an advanced SP one and a prototype MP one. The considered 7.8 liter engine was designed and produced to implement a Sigle-Point (SP) strategy and has hence been modified to run with a dedicated Multi-Point (MP) system so as to take advantage of its flexibility in terms of control strategies. More specifically, a thorough comparison between the experimental performances of the engine equipped with the two injection systems has been carried out at steady state as well as at transient operations. Better performances in terms of cycle-to-cycle variability were proved for the MP system despite poorer mixture homogeneity. Attention has also been paid to the different engine control strategies to be eventually adopted in compliance with the constraints set by the two different layouts. A 0D-1D model has also been built and validated on the experimental data set to be hence exploited for investigating into different strategies both for the SP and for the MP layout. An extensive simulation has been carried out on the effects of the injection phasing on the SP system performance referring to the engine power output and to the air-to-fuel ratio homogeneity amongst the cylinders. Finally, as far as the MP injection system is concerned, the innovative fire-skipping (DSF) or cylinder deactivation has been considered and deployed by means of the numerical model, assessing for an overall decrease in the fuel consumption of 12% at part load operations.
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Grasreiner, Sebastian. "Combustion modeling for virtual SI engine calibration with the help of 0D/3D methods." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2012. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-90518.
Повний текст джерелаАнотація:
Spark ignited engines are still important for conventional as well as for hybrid power trains and are thus objective to optimization. Today a lot of functionalities arise from software solutions, which have to be calibrated. Modern engine technologies provide an extensive variability considering their valve train, fuel injection and load control. Thus, calibration efforts are really high and shall be reduced by introduction of virtual methods. In this work a physical 0D combustion model is set up, which can cope with a new generation of spark ignition engines. Therefore, at first cylinder thermodynamics are modeled and validated in the whole engine map with the help of a real-time capable approach. Afterwards an up to date turbulence model is introduced, which is based on a quasi-dimensional k-epsilon-approach and can cope with turbulence production from large scale shearing. A simplified model for ignition delay is implemented which emphasizes the transfer from laminar to turbulent flame propagation after ignition. The modeling is completed with the calculation of overall heat release rates in a 0D entrainment approach with the help of turbulent flame velocities. After validation of all sub-models, the 0D combustion prediction is used in combination with a 1D gas exchange analysis to virtually calibrate the modern engine torque structure and the ECU function for exhaust gas temperature with extensive simulationsModerne Ottomotoren spielen heute sowohl in konventionellen als auch hybriden Fahrzeugantrieben eine große Rolle. Aktuelle Konzepte sind hochvariabel bezüglich Ventilsteuerung, Kraftstoffeinspritzung und Laststeuerung und ihre Optimierungspotentiale erwachsen zumeist aus neuen Softwarefunktionen. Deren Applikation ist zeit- und kostenintensiv und soll durch virtuelle Methoden unterstützt werden. In der vorliegenden Arbeit wird ein physikalisches 0D Verbrennungsmodell für Ottomotoren aufgebaut und bis zur praktischen Anwendung geführt. Dafür wurde zuerst die Thermodynamik echtzeitfähig modelliert und im gesamten Motorenkennfeld abgeglichen. Der Aufbau eines neuen Turbulenzmodells auf Basis der quasidimensionalen k-epsilon-Gleichung ermöglicht anschließend, die veränderlichen Einflüsse globaler Ladungsbewegung auf die Turbulenz abzubilden. Für den Brennverzug wurde ein vereinfachtes Modell abgeleitet, welches den Übergang von laminarer zu turbulenter Flammenausbreitung nach der Zündung in den Vordergrund stellt. Der restliche Brennverlauf wird durch die physikalische Ermittlung der turbulenten Brenngeschwindigkeit in einem 0D Entrainment-Ansatz dargestellt. Nach Validierung aller Teilmodelle erfolgt die virtuelle Bedatung der Momentenstruktur und der Abgastemperaturfunktion für das Motorsteuergerät
Частини книг з теми "0D-1D simulation"
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Negüs, Feyyaz, Michael Grill, Arndt Döhler, and Michael Bargende. "Eine 0D/1D-Untersuchung der Technologiekombinationen bei Ottomotoren für Wirkungsgradverbesserung." In Experten-Forum Powertrain: Simulation und Test 2020, 17–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-63606-0_2.
Повний текст джерела
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Grill, Michael, Mahir Tim Keskin, Michael Bargende, Sven Fasse, and Sebastian Hann. "Concept Studies 2025+: Challenging Tasks in 0D/1D Engine Simulation." In Proceedings, 215–37. Wiesbaden: Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-24984-7_14.
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Nomura, Yoshihiro, S. Yamamoto, M. Nagaoka, S. Diel, K. Kurihara, R. Shimizu, and E. Murase. "A quasi-theoretical predictive 0D combustion model for 1D gasoline engine simulation." In 17. Internationales Stuttgarter Symposium, 889–98. Wiesbaden: Springer Fachmedien Wiesbaden, 2017. http://dx.doi.org/10.1007/978-3-658-16988-6_70.
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Grill, Michael, Alexander Fandakov, Sebastian Hann, Mahir-Tim Keskin, Lukas Urban, and Michael Bargende. "Lean combustion, EGR or gHCCI at high-load: challenging tasks in the 0D / 1D engine simulation." In Proceedings, 149–74. Wiesbaden: Springer Fachmedien Wiesbaden, 2018. http://dx.doi.org/10.1007/978-3-658-21015-1_11.
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Grill, M., S. Hann, Sven Fasse, Mahir Tim Keskin, and M. Bargende. "Concept studies of SI engines 2030+ – Challenging tasks in 0D/1D engine simulation." In Innovative Antriebe 2018, 107–36. VDI Verlag, 2018. http://dx.doi.org/10.51202/9783181023341-107.
Повний текст джерелаТези доповідей конференцій з теми "0D-1D simulation"
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Ponti, Fabrizio, Nabil Souhair, Stefano Mini, and Adriano Annovazzi. "0D Unsteady - 1D Quasi-Stationary Internal Ballistic coupling for ROBOOST simulation tool." In AIAA Propulsion and Energy 2019 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-4140.
Повний текст джерела
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Tauveron, Nicolas, Pascal Ferrand, and Francis Leboeuf. "Simulation of Surge Inception and Performance of Axial Multistage Compressor." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90163.
Повний текст джерелаАнотація:
This work concerns transient multistage turbomachine modeling. The main application is the simulation of off-design regimes and unstable situations (essentially surge). Two specific approaches are developed: the first is a simple and fast model, based on a simplification of actuator disk model (0D). The second approach is based on 1D axisymmetric Navier-Stokes equations at the scale of the row. The models are tested on open literature cases of the gas turbine aircraft community. The numerical results compare favorably with these data from a qualitative point of view. The description of deep surge occurrence and the prediction of quantitative elements of compressor performance during surge are satisfactory provided few steady-state parameters are correctly determined. Otherwise the fully deterministic approach gives approximate, but acceptable results for a 0D or 1D model.
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Moura, F. L. C., G. A. R. de Paula, G. F. F. Maia, E. Baars, C. K. Takemori, and D. W. da Silva. "Powertrain Air Intake System Noise Simulation Considering 0D/1D and 3D Numeric Methodologies." In 25th SAE BRASIL International Congress and Display. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2016. http://dx.doi.org/10.4271/2016-36-0433.
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Engelmayer, Michael, Andreas Wimmer, Gerhard Pirker, Bernhard Pemp, and Gernot Hirschl. "Simulation Based Development of Combustion Concepts for Large Diesel Engines." In ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/icef2011-60194.
Повний текст джерелаАнотація:
The development of low-emission combustion concepts for large Diesel engines requires a specially adapted methodology. In all phases of the development process, it is essential that appropriate tools are used so that an optimized solution can be found within a short time. This paper will describe the methodology used for developing combustion concepts for large Diesel engines. In general, the development of a combustion concept for Diesel engines comprises the definition of the system (e.g. combustion chamber geometry, injection system, EGR system and charging system) and the calibration of engine parameters (e.g. injection parameters, EGR rate, charge pressure, excess air ratio and valve timing) for an application and its emission scenario. In the present case, the main objective was to develop concepts for applications to comply with emissions standards according to EU Stage III B and US EPA Tier 4. To this end, the LEC has developed the LDM method (LEC Development Methodology). This method is based on the intensive interaction of simulation with experimental investigations on single-cylinder research engines. As part of this development methodology, 3D CFD simulation as well as 0D and 1D engine cycle calculation are employed. Another approach used to handle the complexity of the systems is Design of Experiments (DoE) for simulation and experimental work. While 3D CFD simulation is used to optimize the details of the combustion and pollutant formation processes in the combustion chamber, 0D and 1D engine cycle simulation is applied to select the concepts and to pre-optimize important engine parameters. One great advantage of 0D and 1D models is their short calculation time, which allows the investigation of a great amount of variations in parameters. In order to apply the methodology, it must be guaranteed that the results from tests on the single-cylinder engine (SCE) can be transferred to the multi-cylinder engine (MCE). Therefore, it is necessary that the boundary conditions of the SCE are comparable to those of the MCE. Not only the same thermal boundary conditions but also the same conditions at the beginning of the high-pressure cycle (charge composition, pressure and temperature) must be maintained. The SCE measurement results that are generated serve to verify and calibrate the simulation models and deliver the necessary boundary conditions for further simulations. All in all, the paper comprises an evaluation of the different simulation models used and the applied development methodology in order to optimize fuel consumption and to reduce the emissions of large Diesel engines.
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Saurabh, Shakti, and Britant Sureka. "An Evaluation of an Unhealthy Part Identification Using a 0D-1D Diesel Engine Simulation Based Digital Twin." In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2022. http://dx.doi.org/10.4271/2022-01-0382.
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Reed, John A., and Mark G. Turner. "An Entropy Loss Approach for a Meanline Bladerow Model With Coupling to Test Data and 3D CFD Results." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68608.
Повний текст джерелаАнотація:
A methodology which couples a computational fluid dynamics simulation and a ID meanline bladerow model employing entropy-based loss terms is presented. A 3D APNASA CFD flow solution of the GE90-94B was used to provide input to the 1D bladerow model, which computed entropy-generation terms from the flow state. These terms accounted for losses in mixing of leakage and cooling flow, and gross aerodynamics using bladerow entropy loss coefficients as defined by Denton. A description of the 1D model is presented. The 1D bladerow model was implemented in the NPSS system making it possible to easily construct N-stage component simulations. The 1D model was used to generate partial performance maps of the HPT and LPT for use in a coupled 0D-3D simulation of the full GE90 engine. To validate the approach, a data match of the GE EEE HPT at the design point has been made and presented. An extrapolation of the model to off-design points has compared favorably to the experimental data.
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Gelner, Alexander D., Rudolf Höß, Andreas Zepf, Martin Härtl, and Georg Wachtmeister. "Engine Operation Strategies for the Alternative Diesel Fuel Oxymethylene Ether (OME): Evaluation based on Injection Rate Analyzer and 0D-/1D-Simulation." In SAE Powertrains, Fuels & Lubricants Digital Summit. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2021. http://dx.doi.org/10.4271/2021-01-1190.
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Rasooli, N., S. Besharat Shafiei, and H. Khaledi. "Combination of 1D Code and CFD for Performance Analysis of a Silo Type Gas Turbine Combustor." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23319.
Повний текст джерелаАнотація:
Whereas Gas Turbines are the most important producers of Propulsion and Power in the world and with attention to the importance of combustion chamber as one of the three basic components of Gas Turbine, various activities in different levels have been done on this component. Because of the environmental limitations and laws related to the pollutants such as NOx and CO, Lean Premixed Combustion Chambers are specially considered in gas turbine industries. This study is part of a Multi-Layer simulation of the whole gas turbine cycle in MPG Company. In this work, the combination of a general 1D code and CFD is used for deriving appropriate performance curves for a 1D and 0D gas turbine design, off-design and dynamic cycle code. This 1D code is a general code which has been developed for different combustion chambers; annular, can-annular, can type and silo type combustion chambers. The purpose of generating this 1D code is the possibility of fast analysis of combustors in different operating conditions and reaching required outputs. This 1D code is a part of a general simulation 1D code for gas turbine and was used for a silo type combustor performance prediction. This code generates required quantities such as pressure loss, exit temperature, liner temperature and mass distribution through the combustion chamber. Mass distribution and pressure loss are analyzed and determined with an electrical analogy. Results derived from 1D code are validated with empirical data available for different combustors. There is appropriate agreement between these experimental and analytical results. Drag coefficients for liner holes are available from experimental data and for burner are calculated as a curve with CFD simulations. What differs this code from other 1D codes for gas turbine combustors is the advantage of using combustion efficiencies evolved from numerical simulation results in different loads. These efficiencies are determined with CFD simulations and are available as maps and inserted into the gas temperature calculation algorithm of 1D code. In other 1D codes in this field, empirical correlations are used for combustion efficiency determination. Combustion efficiency curves for design and off-design conditions in this study are achieved by 2D and 3D simulation of combustion chamber with application of EBU/Finite Rate model and 8 step reactions of CH4 burning. Diffusion flame in low loads and premixed flame in high loads are considered. Flame stability and Lean Blow Out charts are evolved from CFD simulation and Heat transfer is applied with empirical correlations.
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Partridge, K. R., P. R. Jha, H. Mahabadipour, K. K. Srinivasan, and S. R. Krishnan. "Systematic Uncertainty Considerations in the Comparison of Experimental and Computed Cylinder Pressure and Heat Release Histories." In ASME 2018 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icef2018-9707.
Повний текст джерелаАнотація:
Computational simulations of engine combustion processes are increasingly relied upon to lead the design of advanced IC engines. Both computational fluid dynamics (CFD) simulations as well as thermodynamics-based phenomenological 0D or 1D gas dynamics simulations are examples of current simulation strategies. Before simulations can be utilized to guide the design process, they must be validated with experimental results. Typically, the experimental data used for validation of computational simulations include in-cylinder pressure and apparent heat release rate (AHRR) histories. However, the process of comparison of experimental and simulated pressure and AHRR curves is largely qualitative; therefore, the validation process is mostly visual. In the present work, the authors introduce a framework for quantifying uncertainties in experimental pressure data, as well as uncertainties in the “average” AHRR curve that is derived from ensemble-averaged cylinder pressure histories. Predicted AHRR curves from CFD simulations are also quantitatively compared with the experimental AHRR bounded by “uncertainty bands” in the present work.
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Cheikh Brahim, Abed, Khelladi Sofiane, Deligant Michael, El Marjani Abdel, and Farid Bakir. "Preliminary Study of a Centrifugal Compressor With Counter-Rotating Impellers: Design and Performances Study." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15860.
Повний текст джерелаАнотація:
Abstract Turbomachinery with double counter-rotating impellers offer more degrees of freedom in the choice of design and control parameters compared to conventional machines. For these innovative machines, the literature review shows that more published works are available concerning axial type turbomachines than centrifugal ones. This work deals with a preliminary design and performance analysis applied to two counter-rotating impellers of a centrifugal compressor. We present here the design practice developed based on 0D/1D models, also coupled with optimization and stream-curvature through-flow methods to satisfy the selected design-criteria. An analyze of aerodynamic performances results are made and compared to those available experimental and numerical data of a baseline configuration, composed of one centrifugal-impeller and a volute. The compressor studied here includes a first conventional impeller with an axial inlet and a mixed or centrifugal outlet. The second impeller is designed parametrically and can be considered as a rotating-diffuser with a radial or mixed inlet and outlet. Ultimately, the numerical simulation results of a selection of candidate solutions are discussed.