Reinhard Tatschl

Reinhard Tatschl
AVL LIST GMBH · Advanced Simulation Technologies

Dipl.-Ing. Dr.-techn.

About

99
Publications
15,184
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599
Citations

Publications

Publications (99)
Conference Paper
Full-text available
To successfully master the upcoming challenges related to the 2030 EU fleet-wide average CO2 emission targets for passenger cars and light-duty vehicles as well as for heavy-duty vehicles such as trucks and lorries, further increased electrification/hybridization of vehicle powertrains is indispensable. In this context, simulation is an efficient a...
Chapter
Bei der Auslegung und Optimierung von Abgasnachbehandlungssystemen, üblicherweise bestehend aus Katalysatoren, Partikelfiltern und gegebenenfalls Dosiereinheiten, gewinnt der Einsatz von Simulationsverfahren zunehmend an Bedeutung. 1D-Simulationsmodelle ermöglichen bereits in der frühen Konzeptphase die Untersuchung und Bewertung unterschiedlicher...
Chapter
Die Herabsetzung von gesetzlich erlaubten Emissionen ist ein seit vielen Jahren weltweit stattfindender kontinuierlicher Prozess. Emissionsvorschriften sind dabei stark diversifiziert und berücksichtigen Unterschiede in Motortyp, Fahrzeug/Motorkategorie, Motorleistung und Land/Region, in denen sie zur Anwendung kommen. Beim Motortyp wird zwischen D...
Article
A new quasi-dimensional combustion model based on the flame tracking approach is described and presented in the paper. The new quasi-dimensional flame tracking model is able to simulate the turbulent combustion process in premixed fuel/air/residual gas mixtures. A new method for the description of the geometry of the combustion chamber and flame fr...
Chapter
Environmental concerns and subsequent regulations for large CO2 emission reductions have led to the development of innovative powertrain technologies for vehicles of all types. This chapter describes how through the integration of real-time off-board information, from diverse Information and Communication Technologies (ICT) sources, such as v2x, sa...
Article
Full-text available
The paper deals with statistical analysis of large amount of detailed 3-D CFD data in terms of cycle-to-cycle variations (CCVs). These data were obtained by means of LES calculations of many consecutive cycles. Due to non-linear nature of Navier-Stokes equation set, there is a relatively significant CCV. Hence, every cycle is slightly different – t...
Article
Full-text available
The paper deals with CCV knowledge transfer from reference data (either experiments or 3-D CFD data) into system simulation SW tools (based on 0-D/1-D CFD). It was verified that CCV phenomenon can be modeled by means of combustion model perturbations. The proposed methodology consists of two major steps. First, individual cycle data have to be matc...
Article
Lithium-ion batteries are in widespread use in electric vehicles and hybrid vehicles. Besides features like energy density, cost, lifetime, and recyclability the safety of a battery system is of prime importance. The separator material impacts all these properties and requires therefore an informed selection. The interplay between the mechanical an...
Article
Full-text available
The paper describes a development of a degradation model, which enables to predict time-dependent changes in performance of a polymer electrolyte fuel cell. The developed model consists of two main parts: 1) a new semi-empirical model taking into account changes in physico-chemical properties of a polymer electrolyte membrane operating in the fuel...
Article
Abstract The analysis of particular effects that influence cyclic combustion variability in spark-ignition engines is presented in this paper. The cycle-simulations are performed over 16 knock-free full load operating conditions of a single cylinder engine fuelled with gasoline. For the modelling of early flame kernel growth a newly developed quasi...
Article
In the present work, a scalable simulation methodology is presented that enables the assessment of the impact of SI-engine cycle-to-cycle combustion variations on fuel consumption and hence CO2 emissions on three different levels of modeling depth: in-cylinder, steady-state engine and transient engine and vehicle simulation. On the detailed engine...
Chapter
Bei der Auslegung und Optimierung von Abgasnachbehandlungssystemen, üblicherweise bestehend aus Katalysatoren, Partikelfiltern und gegebenenfalls Dosiereinheiten, gewinnt der Einsatz von Simulationsverfahren zunehmend an Bedeutung. 1D-Simulationsmodelle ermöglichen bereits in der frühen Konzeptphase die Untersuchung und Bewertung unterschiedlicher...
Chapter
Die zukünftigen CO2 Szenarien stellen weltweit die wesentlichste Entwicklungsherausforderung für PKW-Antriebe dar. Während in den letzten Jahren in Europa die Reduzierung des Flottenmittelwerts stark durch die Erhöhung des Dieselanteils realisiert wurde, erfolgt jetzt durch neue Benzindirekteinspritztechnologien in Verbindung mit verbessertem Energ...
Article
This work presents the development of a 1D model describing water and charge transport through the polymer electrolyte membrane (PEM) in the fuel cell. The considered driving forces are electrical potential, concentration and pressure gradients. The membrane properties such as water diffusion and electro-osmotic coefficients, water sorption and ion...
Conference Paper
This paper outlines an improved computational methodology to simulate the immersion quenching heat transfer characteristics. Main applicability of the presented method lays in virtual experimental investigation of the heat treatment of cast aluminum parts, above all cylinder heads of internal combustion engines. The boiling phase change process bet...
Conference Paper
This paper summarizes the improved computational methodology to predict and simulate the heat transfer characteristics present in immersion quenching processes of cast aluminum parts of internal combustion engines. The numerical model implemented in the commercial Computational Fluid Dynamics (CFD) code AVL FIRE v2013.1 accounts for the phase chang...
Article
In spark-ignition engines, fluctuations of the in-cylinder pressure trace and the apparent rate of heat release are usually observed from one cycle to another. These Cycle-to-Cycle Variations (CCV) are affected by the early flame development and the subsequent flame front propagation. The CCV are responsible for engine performance (e.g. fuel consum...
Article
Full-text available
Efficient mixing of pulverized fuel and limestone particles inside cement calciners is important due to the reason that the calcination process directly affects the final fuel consumption. The focus of this paper is on the numerical analysis of cement calciner’s operating conditions and pollutant emissions. The paper analyzes the influence of diffe...
Article
The presented paper deals with a methodology to model cycle-to-cycle variations (CCV) in 0-D/1-D simulation tools. This is achieved by introducing perturbations of combustion model parameters. To enable that, crank angle resolved data of individual cycles (pressure traces) have to be available for a reasonable number of engine cycles. Either experi...
Article
A Large-Eddy-Simulation (LES) approach is applied to the calculation of multiple SI-engine cycles in order to study the causes of cycle-to-cycle combustion variations. The single-cylinder research engine adopted in the present study is equipped with direct fuel-injection and variable valve timing for both the intake and exhaust side. Operating cond...
Article
Full-text available
The paper presents the main elements of a project entitled ICT-Emissions that aims at developing a novel methodology to evaluate the impact of ICT-related measures on mobility, vehicle energy consumption and CO2 emissions of vehicle fleets at the local scale, in order to promote the wider application of the most appropriate ICT measures. The propos...
Article
The cement industry is one of the leading producers of anthropogenic greenhouse gases, of which CO 2 is the most significant. Recently, researchers have invested a considerable amount of time studying ways to improve energy consumption and pollutant formation in the overall cement manufacturing process. One idea involves dividing the calcination an...
Conference Paper
The present paper deals with the application of the LES approach to in-cylinder flow modeling. The main target is to study cycle-to-cycle variability (CCV) using 3D-CFD simulation. The engine model is based on a spark-ignited single-cylinder research engine. The results presented in this paper cover the motored regime aiming at analysis of the cycl...
Conference Paper
Export Date: 21 August 2012, Source: Scopus, Article in Press
Article
Full-text available
Cement calciners are pyroprocessing units found in modern cement plants. Inside of them occurs a strong endothermic reaction known as the calcination process, and the combustion of pulverized solid fuels. Controlling the mixing of limestone and pulverized fuel particles is of particular importance because it directly affects the energy consumption....
Chapter
The design and optimization of exhaust aftertreatment systems is increasingly supported by computer modeling and numerical simulations. 1D simulation models support decisions on base designs in the early concept phase by providing virtual investigations of various design variants with respect to overall conversion performance. High detail 3D simula...
Article
New engine development trends that include high levels of boosting have put a requirement for models that will be able to predict knock. Therefore a new knock model that uses non-uniform temperature distribution of the unburned zone and is able to run multiple cycles in reasonable time was developed. The model is implemented into cycle simulation s...
Article
Full-text available
Cement industry is one of the leading producers of the greenhouse gases. During the cement production process, large amounts of carbon dioxide are emitted. There are two processes from which carbon dioxide is produced. One of the processes is the exothermic combustion of the fuel and the other is a strong endothermic calcination reaction. The purpo...
Article
Numerical simulations of spray formed by high pressure fuel injectors are usually modelled by Euler Lagrangian method, where motion of the droplet parcels is tracked through the flow field using Lagrangian formulation. The computational effort for this method increases drastically with increasing parcel number, making it useful mainly for sufficien...
Article
Full-text available
In this paper, the formation of nitrogen pollutants in computational fluid dynamics simulation of turbulent non-premixed flame was modelled by coupling reduced nitrogen chemical reaction mechanisms with comprehensive combustion model.
Article
For improving the efficiency of internal combustion engines, the optimisation of the oil and air flow in the crankcase is of particular interest. Due to the complexity of the crank drive motion CFD was rarely used for this application so far. The present work intends to provide a better understanding of the droplet formation and transport processes...
Article
The introduction of more stringent standards for engine emissions requires a steady development of engine control strategies in combination with efforts to optimize in-cylinder combustion and exhaust gas aftertreatment. This study presents a simulation approach combining an engine and vehicle model. A well established 1D gas dynamics and engine sim...
Article
Numerical simulations of spray formed by high pressure fuel injectors are usually modelled by Euler Lagrangian method, where motion of the droplet parcels is tracked through the flow field using Lagrangian formulation. The computational effort for this method increases drastically with increasing parcel number, making it useful mainly for sufficien...
Article
Full-text available
In this work multi phase flow and erosion analysis were done via simulations in AVL's Workflow Manager with FIRE Solver CFD application, for standard diesel and two alternative biofuels, FAME and DME, inside different nozzle models and with various boundary conditions. Driving force for fluid flow is static pressure difference between inlet and out...
Article
The introduction of more stringent standards for engine emissions requires a steady development of engine control strategies in combination with efforts to optimize in-cylinder combustion and exhaust gas aftertreatment. This study presents a simulation approach combining an engine and vehicle model. A well established 1D gas dynamics and engine sim...
Article
An improved version of the ECFM-3Z combustion model coupled with advanced models for NO and soot formation has been implemented in the CFD code FIRE and validated with respect to its applicability to conventional and alternative Diesel combustion. For this purpose the set of models was applied to the calculation of combustion and pollutant formatio...
Article
Full-text available
Numerical simulation is a widely used research tool in internal combustion related research. This paper summarizes results of research about a new approach of spray formation calculations. Using a primary breakup model for separately describing the initial liquid disintegration of injected liquid based on the flow properties stemming from a previou...
Article
The accuracy of emission models about both soot and NOx has been evaluated. Diesel engine simulation is conducted by coupling with the internal nozzle flow calculation in order to consider the cavitating effect. Three different EGR ratios, 12%, 14.5% and 17% are examined. Model parameters about both breakup and ignition models are adjusted to get b...
Article
Full-text available
Presented are two approaches for coupled simulations of the injector flow with spray formation. In the first approach the two-fluid model is used within the injector for the cavitating flow. A primary breakup model is then applied at the nozzle orifice where it is coupled with the standard discrete droplet model. In the second approach the Eulerian...
Article
The combustion of liquid hydrocarbon fuels in internal combustion engines and gas turbines for energy production and aircraft propulsion is intrinsically tied to the formation of pollutants. Apart from aiming for the highest combustion efficiencies in order to lower the operational costs and the emission of CO2, the reduction of poisonous and envir...
Conference Paper
Full-text available
The objective of the presented work was to investigate the effects of high pressure cavitating diesel flows similar to those in real diesel engines with common rail injectors. Accurate experimental information about the flow is necessary for further development of the numerical models for prediction of cavitation and subsequent erosive effects. A t...
Article
Beside appropriate turbulence and combustion modeling, the problem of an accurate prediction of turbulent diffusion flames usually requires accurate radiative heat transfer predictions as well. In this paper it is shown that the inclusion of radiation modeling into the overall numerical simulation is important if accurate temperature profiles are n...
Article
A series calculation methodology from injector nozzle flow to in-cylinder mixture formation in diesel engine was developed and evaluated in this study. In this approach, an Eulerian three-fluid model was used to calculate cavitating nozzle flow inside the injector, and spatial distributions of velocity, turbulent energy, void fraction, etc. at the...
Chapter
This chapter validates a turbulent combustion model using a first series of experimental results. The model is an extension of the coherent flame model (CFM) and is referred to as the mixing CFM (MCFM), which is capable of treating rich and lean mixtures under (in-) homogeneously premixed and non-premixed conditions that can occur, for example, in...
Article
Full-text available
This article presents dynamic light scattering measurements of soot particles formed in a laminar propane-air diffusion flame. After a short introduction to the problem of soot formation in diffusion flames we give a brief survey of dynamic light scattering and of the special problems of such measurements and evaluation of data from flowing gas pha...