SAE World Congress & Exhibition

Total Page:16

File Type:pdf, Size:1020Kb

SAE World Congress & Exhibition SAE World Congress & Exhibition Technical Session Schedule As of 04/26/2009 07:40 pm Monday, April 14 Status of POF in Automobiles Session Code: AE12-2 Room TBD Session Time: Panelists - Henry Muyshondt, The Most Corporation and SMSC; Monday, April 20 The Road Map to 35MPG: What Technologies Will Get Us There? Session Code: ANN200 Room FEV Powertrain Innovation Forum Session Time: 10:00 a.m. The new fuel economy regulations present a major challenge to the auto industry. The panel will discuss in some detail the technologies that are most likely to be utilized to attain the federal mandate. The discussion will also reveal what changes the energy industry must make in order for some of the technologies to generate the efficiency increases that will be necessary for adoption. Moderators - Floyd E. Allen, Senior Consultant, FEV, Inc.; Gary W. Rogers, President & CEO, FEV, Inc. Panelists - John M. German, Senior Fellow, Intl Council for Clean Transportation; Trevor O. Jones, Chairman, NRC Comm on Fuel Economy Tech for L.D. Vehicles; John W. Juriga, Director, Pwtrn, Hyundai-Kia America Technical Center, Inc.; Charles Klein, Director, Global Mass, Energy & Aerodynamics, GM Product Dev; Norbert Krause, Director, Engrg & Environmental Off, Volkswagen of America; Johannes Jorg Rueger, Sr VP, Diesel Systems N.A. Engrg, Robert Bosch LLC; Monday, April 20 New Control System Technologies for Green Powertrain Concepts: What Solutions Present the Most Promise Session Code: ANN204 Room FEV Powertrain Innovation Forum Session Time: 1:30 p.m. New, "green" powertrain concepts will require a completely new thought process when designing the control systems for the future systems. Plug-in hybrids, hybrids, dual fuel engines, etc. will demand new control systems to optimize the efficiency and operating costs for the consumer. The panel will discuss what is in the pipeline and what partnerships are necessary for the new systems to be realized. Moderators - Mazen Hammoud, Ford Motor Co. Panelists - Roberts Abele, Vice President - Powertrain Electronics, Continental; Raymond Anton, Engineering Director, Powertrain Electronics, Delphi; Kent Helfrich, Director, Software Engineering, General Motors Corp.; Peter J. Maloney, Principal Consulting Engineer, The MathWorks Inc.; Alan Rooke, NA Auto FAE Director, Freescale Semiconductor; Monday, April 20 What Lies Over the Horizon? Industry Thought Leaders Forecast the Global Economic/Policy Climate that Automotive Executives Need to Know Session Code: ANN300 Room SAE Executive Business Theater Session Time: 1:00 p.m. Automotive decision makers are inundated with opportunities and challenges they must face today in an ever-changing financial, economic, political and regulatory environment. How do you know your biggest challenge and opportunity may lie just beyond the business decisions you make today?<br/br><br/br>Fast forward to 2010. You are representing your company at a global awards banquet. You are with your CEO who wants to understand how you knew how to navigate through rough waters and follow this winning course. <br/br><br/br>This session will introduce you to key people who could give you that outside perspective that will be essential for your company's future. You will hear an open and blunt discussion about trends that will have real impact in the coming decade, including questions addressing: <br/br><br/br>-What are the economics behind the move to more eco-friendly vehicles?<br/br>-What are emerging local, regulatory and political considerations that may expand into global policies?<br/br>-Will capital markets reward those companies that go green?<br/br>-Does green mobility mean something different in emerging markets?<br/br>-Does the promise of alternative-fueled mobility outweigh the realities of local markets?<br/br>-How smart companies will survive the volatile economy.<br/br>- Where capital investment should be made for long-term growth. Moderators - Larry L. Fobes, Dir, Inst for Org & Ind Competitiveness, Wayne State Univ. Panelists - Iain Carson, Europe Business Editor, The Economist; Richard G. Goetz, International Practice Group Leader, Dykema; Michael Granoff, Head of Oil Independence Policies, Better Place; David Hemmings, President & CEO, PRA Global Business Development; Michelle Krebs, Editor, Edmunds' AutoObserver; Monday, April 20 Green Mobility - The Long View Session Code: ANN100 Room AVL Technology Leadership Theater Session Time: 10:00 a.m. Green mobility in the future necessitates radical thinking. In this panel we will examine game-changing technologies on the far horizon and new concepts ranging from individual personal mobility to city-wide break-through thinking towards the making of a new, sustainable mobility future. Organizers - Shane Chang, Honda Research Institute USA Inc. Moderators - Paul J. Ingrassia, Wall Street Journal (retired) Panelists - Robert Cervero, Prof, Dept of City & Regional Planning, Univ. of CA-Berkeley; Christopher F. Edwards, Director of the Advanced Energy Systems Lab, Stanford Univ.; Luca Guala, Rep, Masdar Initiative; John B. Heywood, Sun Jae Prof of Mech Engrg, & Dir, Sloan Auto Lab, MIT; Sebastian Thrun, Professor, Stanford Univ.; Monday, April 20 Energy: Field to Wheel Part II Session Code: ANN104 Room AVL Technology Leadership Theater Session Time: 2:30 p.m. This panel discussion is a follow-up to the 2008 discussion which outlined where the energy sources will comes from in the future and the infrastructure needed to optimize the energy mix. The recent tremendous price fluctuation for carbon based fuels and the increasing movement to find "green" sources of energy has and will continue to have a profound effect on the transportation sector. The panel of experts will examine what has changed in the last year, whether the list of energy sources in last year's discussion that were expected to rise to the top are still seen in that light,, the effect of the price variations has had on new sources and how the global community is preparing for the future. In addition, the debate on "food versus energy" will be discussed in the context of the effect on future transportation energy sources. Moderators - Norman D. Brinkman, Technical Fellow, General Motors R&D Ctr. Panelists - Nazeer A. Bhore, Sr Tech Advisor, Corp Planning, Exxon Mobil Corp.; Ric Fulop, Founder & VP Mktg Business Development, A123 Systems Inc.; Dale A. Gardner, Assoc Lab Director, Renewable Fuels & Vehicle Sys, NREL; Magdi K. Khair, Institute Engineer, Southwest Research Institute; Monday, April 20 Safety-Critical Systems (Part 1 of 4) Session Code: AE5 Room D2-08 Session Time: 9:30 a.m. The focus of the session is software and system hazard analysis, implementation of safety-relevant systems and software, fail-safe strategies, distributed fault tolerant systems. Application areas include: active safety, active chassis and alternative energy systems. The draft international standard for functional safety, ISO 26262 is topic of high current interest. Organizers - Sabrina Moertl, TTTech Automotive GmbH; Brian T. Murray, Delphi Corp.; Markus Plankensteiner, TTTech Automotive GmbH Time Paper No. Title 9:30 a.m. 2009-01-0759 Achieving ASIL D for Microcontroller in Safety-Critical Drive-by-Wire System Ziqing Zhai, Shanghai Jiao Tong Univ.; Thierry Corbiere, Atmel 10:00 a.m. 2009-01-0758 Application of ISO 26262 in Distributed Development ISO 26262 in Reality Reinhold Hamann, Jürgen Sauler, Stefan Kriso, Walter Grote, Jürgen Mössinger, Robert Bosch GmbH 10:30 a.m. 2009-01-0745 Decomposition Scheme in Automotive Hazard Analysis David D. Ward, MIRA Ltd.; Roger S. Rivett, Land Rover Ltd.; Peter Jesty, Peter Jesty Consulting Ltd. 11:00 a.m. 2009-01-0743 ISO-26262 Implications on Timing of Automotive E/E System Design Processes Rolf Johansson, Thomas Heurung, Mentor Graphics 11:30 a.m. 2009-01-0755 Integrated Safety Planning According to ISO 26262 Horst Schubotz, MBtech Group The papers in this session are available in a single publication, SP-2222, and also individually. Planned by Electrical and Electronic Systems Committee / Automobile Electronics Activity Monday, April 20 Safety-Critical Systems (Part 2 of 4) Session Code: AE5 Room D2-08 Session Time: 1:30 p.m. The focus of the session is software and system hazard analysis, implementation of safety-relevant systems and software, fail-safe strategies, distributed fault tolerant systems. Application areas include: active safety, active chassis and alternative energy systems. The draft international standard for functional safety, ISO 26262 is topic of high current interest. Organizers - Sabrina Moertl, TTTech Automotive GmbH; Brian T. Murray, Delphi Corp.; Markus Plankensteiner, TTTech Automotive GmbH Time Paper No. Title 1:30 p.m. 2009-01-0763 Combining the Advantages of Simulation and Prototyping for the Validation of Dependable Communication Architectures: The TEODACS Approach Eric Armengaud, Daniel Watzenig, The Virtual Vehicle Competence Center; Michael Karner, Christian Steger, Reinhold Weiß, Graz University of Technology; Christian Netzberger, Martin Kohl, Univ. of Applied Sciences FH Joanneum Kapfenberg; Markus Pistauer, CISC Semiconductor GmbH; Felix Pfister, AVL List GmbH; Harald Gall, austriamicrosystems AG 2:00 p.m. 2009-01-0762 DeSCAS Design Process Model for Automotive Systems - Development Streams and Ontologies Jan Gacnik, German Aerospace Center (DLR); Henning Jost, University of Oldenburg; Daniel Beisel, Technical Univ. of Braunschweig; Juergen Rataj, Frank Koester, German Aerospace Center (DLR) 2:30 p.m. 2009-01-0738
Recommended publications
  • Turbulent-Prandtl-Number.Pdf
    Atmospheric Research 216 (2019) 86–105 Contents lists available at ScienceDirect Atmospheric Research journal homepage: www.elsevier.com/locate/atmosres Invited review article Turbulent Prandtl number in the atmospheric boundary layer - where are we T now? ⁎ Dan Li Department of Earth and Environment, Boston University, Boston, MA 02215, USA ARTICLE INFO ABSTRACT Keywords: First-order turbulence closure schemes continue to be work-horse models for weather and climate simulations. Atmospheric boundary layer The turbulent Prandtl number, which represents the dissimilarity between turbulent transport of momentum and Cospectral budget model heat, is a key parameter in such schemes. This paper reviews recent advances in our understanding and modeling Thermal stratification of the turbulent Prandtl number in high-Reynolds number and thermally stratified atmospheric boundary layer Turbulent Prandtl number (ABL) flows. Multiple lines of evidence suggest that there are strong linkages between the mean flowproperties such as the turbulent Prandtl number in the atmospheric surface layer (ASL) and the energy spectra in the inertial subrange governed by the Kolmogorov theory. Such linkages are formalized by a recently developed cospectral budget model, which provides a unifying framework for the turbulent Prandtl number in the ASL. The model demonstrates that the stability-dependence of the turbulent Prandtl number can be essentially captured with only two phenomenological constants. The model further explains the stability- and scale-dependences
    [Show full text]
  • A Two-Layer Turbulence Model for Simulating Indoor Airflow Part I
    Energy and Buildings 33 +2001) 613±625 A two-layer turbulence model for simulating indoor air¯ow Part I. Model development Weiran Xu, Qingyan Chen* Department of Architecture, Massachusetts Institute of Technology, 77 Massachusetts Avenue, MA 02139, USA Received 2 August 2000; accepted 7 October 2000 Abstract Energy ef®cient buildings should provide a thermally comfortable and healthy indoor environment. Most indoor air¯ows involve combined forced and natural convection +mixed convection). In order to simulate the ¯ows accurately and ef®ciently, this paper proposes a two-layer turbulence model for predicting forced, natural and mixed convection. The model combines a near-wall one-equation model [J. Fluid Eng. 115 +1993) 196] and a near-wall natural convection model [Int. J. Heat Mass Transfer 41 +1998) 3161] with the aid of direct numerical simulation +DNS) data [Int. J. Heat Fluid Flow 18 +1997) 88]. # 2001 Published by Elsevier Science B.V. Keywords: Two-layer turbulence model; Low-Reynolds-number +LRN); k±e Model +KEM) 1. Introduction This paper presents a new two-layer turbulence model that performs two tasks: 1.1. Objectives 1. It can accurately predict flows under various conditions, i.e. from purely forced to purely natural convection. This Energy ef®cient buildings should provide a thermally model allows building ventilation designers to use one comfortable and healthy indoor environment. The comfort single model to calculate flows instead of selecting and health parameters in indoor environment include the different turbulence models empirically from many distributions of velocity, air temperature, relative humidity, available models. and contaminant concentrations. These parameters can be 2.
    [Show full text]
  • Turbulent Prandtl Number and Its Use in Prediction of Heat Transfer Coefficient for Liquids
    Nahrain University, College of Engineering Journal (NUCEJ) Vol.10, No.1, 2007 pp.53-64 Basim O. Hasan Chemistry. Engineering Dept.- Nahrain University Turbulent Prandtl Number and its Use in Prediction of Heat Transfer Coefficient for Liquids Basim O. Hasan, Ph.D Abstract: eddy conductivity is unspecified in the case of heat transfer. The classical approach for obtaining the A theoretical study is performed to determine the transport mechanism for the heat transfer problem turbulent Prandtl number (Prt ) for liquids of wide follows the laminar approach, namely, the momentum range of molecular Prandtl number (Pr=1 to 600) and thermal transport mechanisms are related by a under turbulent flow conditions of Reynolds number factor, the Prandtl number, hence combining the range 10000- 100000 by analysis of experimental molecular and eddy viscosities one obtain the momentum and heat transfer data of other authors. A Boussinesq relation for shear stress: semi empirical correlation for Prt is obtained and employed to predict the heat transfer coefficient for du the investigated range of Re and molecular Prandtl ( ) 1 number (Pr). Also an expression for momentum eddy m dy diffusivity is developed. The results revealed that the Prt is less than 0.7 and is function of both Re and Pr according to the following relation: and the analogous relation for heat flux: Prt=6.374Re-0.238 Pr-0.161 q dT The capability of many previously proposed models of ( h ) 2 Prt in predicting the heat transfer coefficient is c p dy examined. Cebeci [1973] model is found to give good The turbulent Prandtl number is the ratio between the accuracy when used with the momentum eddy momentum and thermal eddy diffusivities, i.e., Prt= m/ diffusivity developed in the present analysis.
    [Show full text]
  • Huq, P. and E.J. Stewart, 2008. Measurements and Analysis of the Turbulent Schmidt Number in Density
    GEOPHYSICAL RESEARCH LETTERS, VOL. 35, L23604, doi:10.1029/2008GL036056, 2008 Measurements and analysis of the turbulent Schmidt number in density stratified turbulence Pablo Huq1 and Edward J. Stewart2 Received 18 September 2008; revised 27 October 2008; accepted 3 November 2008; published 3 December 2008. [1] Results are reported of measurements of the turbulent where rw is the buoyancy flux, uw is the Reynolds shear Schmidt number Sct in a stably stratified water tunnel stress. The ratio Km/Kr is termed the turbulent Schmidt experiment. Sct values varied with two parameters: number Sct (rather than turbulent Prandtl number) as Richardson number, Ri, and ratio of time scales, T*, of salinity gradients in water are used for stratification in the eddy turnover and eddy advection from the source of experiments. Prescription of a functional dependence of Sct turbulence generation. For large values (T* 10) values on Ri = N2/S2 is a turbulence closure scheme [Kantha and of Sct approach those of neutral stratification (Sct 1). In Clayson, 2000]. Here the buoyancy frequency N is defined 2 contrast for small values (T* 1) values of Sct increase by the gradient of density r as N =(Àg/ro)(dr/dz), and g is with Ri. The variation of Sct with T* explains the large the gravitational acceleration. S =dU/dz is the velocity scatter of Sct values observed in atmospheric and oceanic shear. Analyses of field, lab and numerical (RANS, DNS data sets as a range of values of T* occur at any given Ri. and LES) data sets have led to the consensus that Sct The dependence of Sct values on advective processes increases with Ri [see Esau and Grachev, 2007, and upstream of the measurement location complicates the references therein].
    [Show full text]
  • Nasa L N D-6439 Similar Solutions for Turbulent
    .. .-, - , . .) NASA TECHNICAL NOTE "NASA L_N D-6439 "J c-I I SIMILAR SOLUTIONS FOR TURBULENT BOUNDARY LAYER WITH LARGE FAVORABLEPRESSURE GRADIENTS (NOZZLEFLOW WITH HEATTRANSFER) by James F. Schmidt, Don& R. Boldmun, und Curroll Todd NATIONALAERONAUTICS AND SPACE ADMINISTRATION WASHINGTON,D. C. AUGUST 1971 i i -~__.- 1. ReportNo. I 2. GovernmentAccession No. I 3. Recipient's L- NASA TN D-6439 . - .. I I 4. Title andSubtitle SIMILAR SOLUTIONS FOR TURBULENT 5. ReportDate August 1971 BOUNDARY LAYERWITH LARGE FAVORABLE PRESSURE 1 6. PerformingOrganization Code GRADIENTS (NOZZLE FLOW WITH HEAT TRANSFER) 7. Author(s) 8. Performing Organization Report No. James F. Schmidt,Donald R. Boldman, and Carroll Todd I E-6109 10. WorkUnit No. 9. Performing Organization Name and Address 120-27 Lewis Research Center 11. Contractor Grant No. National Aeronautics and Space Administration I Cleveland, Ohio 44135 13. Type of Report and Period Covered 2. SponsoringAgency Name and Address Technical Note National Aeronautics and Space Administration 14. SponsoringAgency Code C. 20546Washington, D. C. I 5. SupplementaryNotes " ~~ 6. Abstract In order to provide a relatively simple heat-transfer prediction along a nozzle, a differential (similar-solution) analysis for the turbulent boundary layer is developed. This analysis along with a new correlation for the turbulent Prandtl number gives good agreement of the predicted with the measured heat transfer in the throat and supersonic regionof the nozzle. Also, the boundary-layer variables (heat transfer, etc. ) can be calculated at any arbitrary location in the throat or supersonic region of the nozzle in less than a half minute of computing time (Lewis DCS 7094-7044).
    [Show full text]
  • Zarif Holds Talks with Aoun Some Countries in Regard to Humanitarian Issues
    ‘Iranian refugees in Total inks major gas Infantino offers German experts restore 21516Australia not in 5 deal in Iran condolences after artworks at Tehran suitable condition’ Pourheydari passing museum WWW.TEHRANTIMES.COM I N T E R N A T I O N A L D A I L Y VelayatiVe ururgesg EuEurope to wowork for pepeace in MMideasti 2 16 Pages Price 10,000 Rials 38th year No.12693 Wednesday NOVEMBER 9, 2016 Aban 19, 1395 Safar 9, 1438 Citizenship Rights Charter awaiting thumbs-up: ZZarifarif holdsholds ttalksalks wwithith AAounoun presidential advisor EXCLUSIVE INTERVIEW POLITICS TEHRAN — Iranian The visit came days after Aoun desk By Maryam Qarehgozlou&Ali Kushki Foreign Minister was elected president. The post had Mohammad Javad Zarif who made a remained vacant for 29 months due Iran says it has finished a draft of the long-waited-for high-profile visit to Beirut starting on to rivalry between powerbrokers in Citizenship Rights Charter after it underwent a thorough Monday held talks with the newly-elected Lebanon. revision, now awaiting for an approval by the Majlis (Iran’s Lebanese President Michel Aoun as well Immediately after his arrival in Beirut, parliament), government, or cabinet. as the prime minister, parliament Speaker, Foreign Minister Zarif held talks with “An initial draft of the Citizenship Rights Charter was and Hezbollah chief. President Aoun. 2 drawn up just months after President Rouhani took office and made available to the public in November 2013,” Elham Aminzadeh, the presidential advisor on citizenship rights, told the Tehran Times on Monday. Aminzadeh said it took until now to come up with the first and second versions of the charter after having listened to public and expert opinions of a pool of resources.
    [Show full text]
  • Stability and Instability of Hydromagnetic Taylor-Couette Flows
    Physics reports Physics reports (2018) 1–110 DRAFT Stability and instability of hydromagnetic Taylor-Couette flows Gunther¨ Rudiger¨ a;∗, Marcus Gellerta, Rainer Hollerbachb, Manfred Schultza, Frank Stefanic aLeibniz-Institut f¨urAstrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany bDepartment of Applied Mathematics, University of Leeds, Leeds, LS2 9JT, United Kingdom cHelmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, D-01328 Dresden, Germany Abstract Decades ago S. Lundquist, S. Chandrasekhar, P. H. Roberts and R. J. Tayler first posed questions about the stability of Taylor- Couette flows of conducting material under the influence of large-scale magnetic fields. These and many new questions can now be answered numerically where the nonlinear simulations even provide the instability-induced values of several transport coefficients. The cylindrical containers are axially unbounded and penetrated by magnetic background fields with axial and/or azimuthal components. The influence of the magnetic Prandtl number Pm on the onset of the instabilities is shown to be substantial. The potential flow subject to axial fieldspbecomes unstable against axisymmetric perturbations for a certain supercritical value of the averaged Reynolds number Rm = Re · Rm (with Re the Reynolds number of rotation, Rm its magnetic Reynolds number). Rotation profiles as flat as the quasi-Keplerian rotation law scale similarly but only for Pm 1 while for Pm 1 the instability instead sets in for supercritical Rm at an optimal value of the magnetic field. Among the considered instabilities of azimuthal fields, those of the Chandrasekhar-type, where the background field and the background flow have identical radial profiles, are particularly interesting.
    [Show full text]
  • Inclined Turbulent Thermal Convection in Liquid Sodium (Pr 0.009) in a Cylindrical Container of the Aspect Ratio One
    Inclined turbulent thermal convection in liquid sodium Lukas Zwirner1, Ruslan Khalilov2, Ilya Kolesnichenko2, Andrey Mamykin2, Sergei Mandrykin2, Alexander Pavlinov2, Alexander Shestakov2, Andrei Teimurazov2, Peter Frick2 & Olga Shishkina1 1Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 17, 37077 G¨ottingen, Germany 2Institute of Continuous Media Mechanics, Korolyov 1, Perm, 614013, Russia Abstract Inclined turbulent thermal convection by large Rayleigh numbers in extremely small-Prandtl-number fluids is studied based on results of both, measurements and high-resolution numerical simulations. The Prandtl number Pr ≈ 0.0093 considered in the experiments and the Large-Eddy Simulations (LES) and Pr = 0.0094 considered in the Direct Numerical Simulations (DNS) correspond to liquid sodium, which is used in the experiments. Also similar are the studied Rayleigh numbers, which are, respectively, Ra = 1.67 × 107 in the DNS, Ra = 1.5 × 107 in the LES and Ra = 1.42 × 107 in the measurements. The working convection cell is a cylinder with equal height and diameter, where one circular surface is heated and another one is cooled. The cylinder axis is inclined with respect to the vertical and the inclination ◦ ◦ angle varies from β = 0 , which corresponds to a Rayleigh–B´enard configuration (RBC), to β = 90 , as in a vertical convection (VC) setup. The turbulent heat and momentum transport as well as time-averaged and instantaneous flow structures and their evolution in time are studied in detail, for different inclination angles, and are illustrated also by supplementary videos, obtained from the DNS and experimental data. To investigate the scaling relations of the mean heat and momentum transport in the limiting cases of RBC and VC configurations, additional measurements are conducted for about one decade of the Rayleigh numbers around Ra = 107 and Pr ≈ 0.009.
    [Show full text]
  • Numerical Calculations of Laminar and Turbulent Natural Convection in Water in Rectangular Channels Heated and Cooled Isothermally on the Opposing Vertical Walls
    ht. J. Hear Maw Transfer. Vol. 28. No. 1, PP. 125-138. 1985 0017~9310/85163.00+0.00 Printed in Great Britain Pergamon Press Ltd. Numerical calculations of laminar and turbulent natural convection in water in rectangular channels heated and cooled isothermally on the opposing vertical walls HIROYUKI OZOE, AKIRA MOURI and MASARU OHMURO Department of Industrial and Mechanical Engineering, School of Engineering, Okayama University, Okayama 700, Japan STUART W. CHURCHILL Department of Chemical Engineering, University of Pennsylvania, Philadelphia, PA 19104, U.S.A. NOAM LIOR Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104, U.S.A. (Received 25 December 1983) Abstract-Natural convetition was computed by finite-difference methods using a laminar model for 2 (wide) x 1 and 1 x 1 enclosures for Ra from lo6 to lo9 and Pr = 5.12 and 9.17, and a k--Eturbulent model for a square enclosure for Ra from 10”’ to 10” and Pr = 6.7. The average Nusselt numbers agree well with the correlating equation of Churchill for experimental and computed values. The computed velocity profile along the heated wall is in reasonable agreement with prior experimental values except for the thin boundary layer along the lower part of the wall where a finer grid size than was computationally feasible appears to be necessary. A detailed sensitivity test for constants of the k--Emodel was also carried out. The velocity profile at the middle height and the average Nusselt number was in even better agreement with the experimental results when the turbulent Prandtl number was increased to four and the constant c1 was decreased by 10%.
    [Show full text]
  • Direct Numerical Simulation and Rans Modeling of Turbulent Natural Convection for Low Prandtl Number Fluids
    March 19, 2004 10:27 Proceedings of ASME/JSME Symposium 2004 5th International Bi-Annual ASME/JSME Symposium on computational technology for fluid / thermal / chemical / stressed systems with industrial applications San Diego / La Jolla, California, USA, July 25-29, 2004 DIRECT NUMERICAL SIMULATION AND RANS MODELING OF TURBULENT NATURAL CONVECTION FOR LOW PRANDTL NUMBER FLUIDS I. Otic´ G. Grotzbac¨ h Institute for Nuclear and Energy Technologies Institute for Nuclear and Energy Technologies Forschungszentrum Karlsruhe Forschungszentrum Karlsruhe 76021 Karlsruhe, Germany 76021 Karlsruhe, Germany Email: [email protected] Email: [email protected] ABSTRACT Prt Turbulent Prandtl number. gβ∆TD3 Results of direct numerical simulation (DNS) of turbulent Ra Rayleigh number, Ra ¡ νκ . ¢ Rayleigh-Benar´ d convection for a Prandtl number Pr ¡ 0 025 p Pressure. 5 and a Rayleigh number Ra ¡ 10 are used to evaluate the turbu- t Time. lent heat flux and the temperature variance. The DNS evaluated T Temperature. turbulent heat flux is compared with the DNS based results of a ∆T Temperature difference. standard gradient diffusion turbulent heat flux model and with ui Velocity in i- direction. ¤ 1 ¦ 2 the DNS based results of a standard algebraic turbulent heat flux u0 Velocity scale, gβ∆TD ¥ . model. The influence of the turbulence time scales on the predic- ¤ § ¥ Xi Coordinates in horizontal i ¡ 1 2 tions by the standard algebraic heat flux model at these Rayleigh- ¤ ¥ and vertical i ¡ 3 directions. and Prandtl numbers is investigated. A four equation algebraic Greek turbulent heat flux model based on the transport equations for β Thermal expansion coefficient. the turbulent kinetic energy k, for the dissipation of the turbu- ∆x Laplace operator.
    [Show full text]
  • Lecture 6. Monin-Obukhov Similarity Theory (Garratt 3.3) in This Lecture
    Atm S 547 Boundary Layer Meteorology Bretherton Lecture 6. Monin-Obukhov similarity theory (Garratt 3.3) In this lecture… • Similarity theory for wind and scalar profiles in stratified surface layers. • Stability correction to bulk surface-air transfer coefficients. Stability correction to vertical profiles in the surface layer Because so many BL measurements are made within the surface layer (i. e. where wind veering with height is insignificant) but stratification effects can be important at standard measurement heights of 2 m (for temperature and moisture) and 10 m (for winds), it is desirable to correct the log-layer profiles for stratification effects. Based on the scaling arguments of last lecture, Monin and Obukhov (1954) suggested that the vertical variation of mean flow and turbulence characteristics in the surface layer should depend only on the surface momentum flux as measured by friction velocity u*, buoyancy flux B0, and height z. One can form a single nondimensional combination of these, which is traditionally chosen as the stability parameter ζ = z/L . (6.1) The logarithmic scaling regime of last time corresponds to ζ << 1. Thus, within the surface layer, we must have (kz/u*)(du/dz) = Φm(ζ) (6.2) -(kz/θ*)(dθ /dz) = Φh(ζ) (6.3) where Φm(ζ) and Φm(ζ) are nondimensional stability functions which relate the fluxes of momentum and θ (i. e. sensible heat) to their mean gradients. Other adiabatically conserved scalars should behave similarly to θ since the transport is associated with eddies which are too large to be affected by molecular diffusion or viscosity. To agree with the log layer scaling, Φm(ζ) and Φm(ζ) should approach 1 for small ζ.
    [Show full text]
  • Urawa Reds Official English Guide 2018
    URAWA RED D I A M O N DS OFFICIAL ENGLISH GUIDE 2018 ©2018 Urawa Red Diamonds All rights reserved. URAWA RED DIAMONDS OFFICIAL ENGLISH GUIDE 2018 CLUB PROFILE Club Name: Urawa Red Diamonds Nickname: Urawa Reds Year of Formation: 1950 Turned Professional: 1992 Home Town: Saitama City, Saitama Prefecture Home Stadium: Saitama Stadium 2002 (63,700) Urawa Komaba Stadium, Saitama City (21,500) Club Colors: red shirts, white shorts and black socks President: FUCHITA Keizo Origin of club name Urawa was the name of the city where Reds started their J. League history in 1993. The city of Urawa became part of the new city of Saitama in 2001 when it merged with the neighboring cities of Yono and Omiya. Reds retained the old name because of its popularity with fans. Achievements: AFC Champions League champions twice (2007 and 2017) CLUB PHILOSPOPHY J. League champions (2006) 1. URAWA RED DIAMONDS aim to contribute to the healthy growth of youth, J. League Second Stage champions twice (2004 and 2016) and the fostering of valuable, conscientious members of society. J. League First Stage champions (2015) 2. URAWA RED DIAMONDS strive to provide an arena J. League Cup winners twice (2003 and 2016) for healthy recreation for the local community. Emperor's Cup winners 6 times (1971, 1973, 1978, 1980, 2005 and 2006) 3. URAWA RED DIAMONDS aim to be Saitama's window to the world. Xerox Super Cup winners (2006) Suruga Bank Championship winners (2017) The Reds Emblem Japan Soccer League champions 4 times (1969, 1973, 1978 and 1982) The core motifs are the ball and the whorl.
    [Show full text]