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  • 1
    Publikationsdatum: 2019-05-24
    Beschreibung: This manual describes the installation and execution of FUN3D (Fully-UNstructured three-dimensional CFD (Computational Fluid Dynamics) code) version 13.5, including optional dependent packages. FUN3D is a suite of computational fluid dynamics simulation and design tools that uses mixed-element unstructured grids in a large number of formats, including structured multiblock and overset grid systems. A discretely-exact adjoint solver enables efficient gradient-based design and grid adaptation to reduce estimated discretization error. FUN3D is available with and without a reacting, real-gas capability. This generic gas option is available only for those persons that qualify for its beta release status.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NASA/TM-2019-220271 , L-21013 , NF1676L-32825
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2019-07-13
    Beschreibung: NASA is currently investigating methods to reduce the boil-off rate on large cryogenic upper stages. Two such methods to reduce the total heat load on existing upper stages are vapor cooling of the cryogenic tank support structure and integration of thick multilayer insulation systems to the upper stage of a launch vehicle. Previous efforts have flown a 2-layer MLI blanket and shown an improved thermal performance, and other efforts have ground-tested blankets up to 70 layers thick on tanks with diameters between 2 3 meters. However, thick multilayer insulation installation and testing in both thermal and structural modes has not been completed on a large scale tank. Similarly, multiple vapor cooled shields are common place on science payload helium dewars; however, minimal effort has gone into intercepting heat on large structural surfaces associated with rocket stages. A majority of the vapor cooling effort focuses on metallic cylinders called skirts, which are the most common structural components for launch vehicles. In order to provide test data for comparison with analytical models, a representative test tank is currently being designed to include skirt structural systems with integral vapor cooling. The tank is 4 m in diameter and 6.8 m tall to contain 5000 kg of liquid hydrogen. A multilayer insulation system will be designed to insulate the tank and structure while being installed in a representative manner that can be extended to tanks up to 10 meters in diameter. In order to prove that the insulation system and vapor cooling attachment methods are structurally sound, acoustic testing will also be performed on the system. The test tank with insulation and vapor cooled shield installed will be tested thermally in the B2 test facility at NASAs Plumbrook Station both before and after being vibration tested at Plumbrooks Space Power Facility.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: GRC-E-DAA-TN24555 , Space Cryogenics Workshop; Jun 24, 2015 - Jun 26, 2015; Phoenix, AZ; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2019-07-13
    Beschreibung: The Soft X-ray Spectrometer (SXS) instrument[1] on Astro-H[2] will use a 3-stage ADR[3] to cool the microcalorimeter array to 50 mK. In the primary operating mode, two stages of the ADR cool the detectors using superfluid helium at 1.20 K as the heat sink[4]. In the secondary mode, which is activated when the liquid helium is depleted, the ADR uses a 4.5 K Joule-Thomson cooler as its heat sink. In this mode, all three stages operate together to continuously cool the (empty) helium tank and singleshot cool the detectors. The flight instrument - dewar, ADR, detectors and electronics - were integrated in 2014 and have since undergone extensive performance testing. This paper presents a thermodynamic analysis of the ADR's operation, including cooling capacity, heat rejection to the heat sinks, and various measures of efficiency.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: GSFC-E-DAA-TN27442 , Cryogenics (ISSN 0011-2275); 74; 24-30
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2019-07-12
    Beschreibung: The Flame Extinguishment Experiment (FLEX) program is a continuing set of experiments on droplet combustion, performed employing the Multi-User Droplet Combustion Apparatus (MDCA), inside the chamber of the Combustion Integrated Rack (CIR), which is located in the Destiny module of the International Space Station (ISS). This report describes the experimental hardware, the diagnostic equipment, the experimental procedures, and the methods of data analysis for FLEX. It also presents the results of the first 284 tests performed. The intent is not to interpret the experimental results but rather to make them available to the entire scientific community for possible future interpretations.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NASA/TP-2015-216046 , E-18493 , GRC-E-DAA-TN5314
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2019-07-20
    Beschreibung: Grid convergence studies are performed to establish reference solutions for benchmark three dimensional turbulent flows in support of the ongoing turbulence model verification and validation e ort at the Turbulence Modeling Resource website curated by NASA. The bench- mark cases are a subsonic flow around a hemisphere cylinder and a transonic flow around the ONERA M6 wing with a sharp trailing edge. The study applies widely-used computational fluid dynamics codes developed and supported at the NASA Langley Research Center: FUN3D, USM3D, and CFL3D. Reference steady-state solutions are computed for the Reynolds-Averaged Navier-Stokes equations with the Spalart-Allmaras turbulence model on families of consistently-refined grids composed of different types of cells. Coarse-to- ne and code-to-code solution variation is described in detail.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NF1676L-27447 , AIAA SciTech 2018; Jan 08, 2018 - Jan 12, 2018; Kissimmee, FL; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 2019-07-13
    Beschreibung: Computational fluid dynamics (CFD) and other advanced modeling and simulation (M&S) methods are increasingly relied on for predictive performance, reliability and safety of engineering systems. Analysts, designers, decision makers, and project managers, who must depend on simulation, need practical techniques and methods for assessing simulation credibility. The AIAA Guide for Verification and Validation of Computational Fluid Dynamics Simulations (AIAA G-077-1998 (2002)), originally published in 1998, was the first engineering standards document available to the engineering community for verification and validation (V&V) of simulations. Much progress has been made in these areas since 1998. The AIAA Committee on Standards for CFD is currently updating this Guide to incorporate in it the important developments that have taken place in V&V concepts, methods, and practices, particularly with regard to the broader context of predictive capability and uncertainty quantification (UQ) methods and approaches. This paper will provide an overview of the changes and extensions currently underway to update the AIAA Guide. Specifically, a framework for predictive capability will be described for incorporating a wide range of error and uncertainty sources identified during the modeling, verification, and validation processes, with the goal of estimating the total prediction uncertainty of the simulation. The Guide's goal is to provide a foundation for understanding and addressing major issues and concepts in predictive CFD. However, this Guide will not recommend specific approaches in these areas as the field is rapidly evolving. It is hoped that the guidelines provided in this paper, and explained in more detail in the Guide, will aid in the research, development, and use of CFD in engineering decision-making.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: AIAA Paper 2016-3811 , NF1676L-24053 , AIAA Aviation Technology, Integration, and Operations Conference (2016 AIAA Aviation); Jun 13, 2016 - Jun 17, 2016; Washington, DC; United States
    Format: application/pdf
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  • 7
    Publikationsdatum: 2019-07-13
    Beschreibung: The four 1,280 bolometer detector arrays that will fly on the balloon borne PIPER mission will be cooled by a 4-stage adiabatic demagnetization refrigerator (ADR). Two of the three mechanically independent ADR assemblies provide thermal isolation to their salt pills through Kevlar suspensions while the other provides thermal isolation to its salt pill through the use of bellows and Vespel material. The ADR integrates with the detector arrays and it sits in a large bucket Dewar containing superfluid liquid helium. This paper will describe the complex mechanical design of the PIPER ADR, and summarize the mechanical analysis done to validate the design.The four 1,280 bolometer detector arrays that will fly on the balloon borne PIPER mission will be cooled by a 4-stage adiabatic demagnetization refrigerator (ADR). Two of the three mechanically independent ADR assemblies provide thermal isolation to their salt pills through Kevlar suspensions while the other provides thermal isolation to its salt pill through the use of bellows and Vespel material. The ADR integrates with the detector arrays and it sits in a large bucket Dewar containing superfluid liquid helium. This paper will describe the complex mechanical design of the PIPER ADR, and summarize the mechanical analysis done to validate the design.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: GSFC-E-DAA-TN44289 , CEC/ICMC2017 Joint Conference; Jul 09, 2017 - Jul 13, 2017; Madison, WI; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Industrial Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Die Anwendung des erweiterten Korrespondenzprinzips zur Berechnung unbekannter thermischer Daten setzt die Kenntnis der kritischen Größen des betreffenden Stoffes voraus. Auf die Möglichkeit der Bestimmung des kritischen Druckes, zugleich mit dem kritischen Parameter (aus zwei Punkten der Dampfdruckkurve), sowie des kritischen Volumens (aus einem Meßwert für die Flüssigkeitsdichte) bei bekannter kritischer Temperatur wurde bereits früher (Teil I bzw. II) hingewiesen. Nun wird gezeigt, daß sich ohne Verwendung weiterer Meßergebnisse auch die bisher schwer zugängliche kritische Temperatur mit verhältnismäßig großer Genauigkeit ermitteln läßt, wenn man die Abhängigkeit des kritischen Koeffizienten vom kritischen Parameter berücksichtigt. Ein graphisches Verfahren erleichtert die praktische Durchführung dieser Bestimmung und gestattet, auch andere gemessene Daten für den gleichen Zweck auszuwerten.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Industrial Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Es wird dargelegt, wie man die Zeit für die Haltbarkeit von verpackten, feuchtigkeitsempfindlichen Gütern aus der Wasserdampfdurchlässigkeit der Packstücke und den Sorptionsisothermen der Güter berechnen kann. Eigene Meß- und Rechenergebnisse, die ausführlich an anderer Stelle1 wiedergegeben sind, bilden die Grundlage für sinnvolle Maßnahmen zu Verbesserungen von Verpackungen.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    ISSN: 0009-286X
    Schlagwort(e): Chemistry ; Industrial Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Auf Grund theoretischer Überlegungen kommt K. S. Pitzer zu denselben Ergebnissen bezüglich einer Erweiterung des Theorems der übereinstimmenden Zustände wie der Verfasser. Bei der Anwendung wird auch der von uns bisher nicht behandelte reale Gaszustand untersucht. Im folgenden wird über diese amerikanischen Arbeiten ausführlich berichtet. Die Tabellen für den „Realfaktor“ Z = pV/RT wurden etwas übersichtlicher zusammengefaßt und hinsichtlich des kritischen Parameters umgerechnet, so daß sie unmittelbar im Rahmen unseres Systems verwendet werden können. Der Vergleich der amerikanischen Ergebnisse für die Sättigungseigenschaften mit denen des Verfassers zeigt für den Dampfdruck praktisch völlige, sonst stets befriedigende Übereinstimmung.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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