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33 results on '"Helm, Sebastian"'

1. First Comparison of CFD Simulation and Wind Tunnel Test of the Forward-Swept Natural Laminar Flow Model NLF-ECOWING-FSW

Author

Helm, Sebastian, Davies, Kristopher, Fehrs, Michael, Hirschel, Ernst Heinrich, Founding Editor, Schröder, Wolfgang, Series Editor, Boersma, Bendiks Jan, Editorial Board Member, Fujii, Kozo, Editorial Board Member, Haase, Werner, Editorial Board Member, Leschziner, Michael A., Editorial Board Member, Periaux, Jacques, Editorial Board Member, Pirozzoli, Sergio, Editorial Board Member, Rizzi, Arthur, Editorial Board Member, Roux, Bernard, Editorial Board Member, Shokin, Yurii I., Editorial Board Member, Lagemann, Esther, Managing Editor, Dillmann, Andreas, editor, Heller, Gerd, editor, Krämer, Ewald, editor, Wagner, Claus, editor, and Weiss, Julien, editor

Published
2024
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2. Turbulent Wedge Modeling in Local Correlation-Based Transition Models

Author

Fehrs, Michael, Helm, Sebastian, Hirschel, Ernst Heinrich, Founding Editor, Schröder, Wolfgang, Series Editor, Boersma, Bendiks Jan, Editorial Board Member, Fujii, Kozo, Editorial Board Member, Haase, Werner, Editorial Board Member, Leschziner, Michael A., Editorial Board Member, Periaux, Jacques, Editorial Board Member, Pirozzoli, Sergio, Editorial Board Member, Rizzi, Arthur, Editorial Board Member, Roux, Bernard, Editorial Board Member, Shokin, Yurii I., Editorial Board Member, Lagemann, Esther, Managing Editor, Dillmann, Andreas, editor, Heller, Gerd, editor, Krämer, Ewald, editor, Wagner, Claus, editor, and Weiss, Julien, editor

Published
2024
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6. Transition Prediction and Analysis of the CRM-NLF Wing with the DLR TAU Code

Author

Helm, Sebastian, Fehrs, Michael, Krimmelbein, Normann, Krumbein, Andreas, Hirschel, Ernst Heinrich, Founding Editor, Schröder, Wolfgang, Series Editor, Boersma, Bendiks Jan, Editorial Board Member, Fujii, Kozo, Editorial Board Member, Haase, Werner, Editorial Board Member, Leschziner, Michael A., Editorial Board Member, Periaux, Jacques, Editorial Board Member, Pirozzoli, Sergio, Editorial Board Member, Rizzi, Arthur, Editorial Board Member, Roux, Bernard, Editorial Board Member, Shokin, Yurii I., Editorial Board Member, Mäteling, Esther, Managing Editor, Dillmann, Andreas, editor, Heller, Gerd, editor, Krämer, Ewald, editor, and Wagner, Claus, editor

Published
2021
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7. Aeroelastic Behavior of a Laminar Wing in Transonic Flow

Author

Fehrs, Michael, Helm, Sebastian, Kaiser, Christoph, Klimmek, Thomas, Hirschel, Ernst Heinrich, Founding Editor, Schröder, Wolfgang, Series Editor, Boersma, Bendiks Jan, Editorial Board Member, Fujii, Kozo, Editorial Board Member, Haase, Werner, Editorial Board Member, Leschziner, Michael A., Editorial Board Member, Periaux, Jacques, Editorial Board Member, Pirozzoli, Sergio, Editorial Board Member, Rizzi, Arthur, Editorial Board Member, Roux, Bernard, Editorial Board Member, Shokin, Yurii I., Editorial Board Member, Mäteling, Esther, Managing Editor, Dillmann, Andreas, editor, Heller, Gerd, editor, Krämer, Ewald, editor, and Wagner, Claus, editor

Published
2021
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8. Towards CFD-Based Aeroelastic Analysis of NLF Wings

Author

Helm, Sebastian, Fehrs, Michael, Nitzsche, Jens, Hirschel, Ernst Heinrich, Founding Editor, Schröder, Wolfgang, Series Editor, Boersma, Bendiks Jan, Series Editor, Fujii, Kozo, Series Editor, Haase, Werner, Series Editor, Leschziner, Michael A., Series Editor, Periaux, Jacques, Series Editor, Pirozzoli, Sergio, Series Editor, Rizzi, Arthur, Series Editor, Roux, Bernard, Series Editor, Shokin, Yurii I., Series Editor, Dillmann, Andreas, editor, Heller, Gerd, editor, Krämer, Ewald, editor, Wagner, Claus, editor, Tropea, Cameron, editor, and Jakirlić, Suad, editor

Published
2020
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9. On Recent Advances in Industrial High-Fidelity Aeroelasticity

Author

Stickan, Bernd, Schröder, Frank, Helm, Sebastian, Bleecke, Hans, Schröder, Wolfgang, General editor, Boersma, Bendiks Jan, Series editor, Fujii, Kozo, Series editor, Haase, Werner, Series editor, Hirschel, Ernst Heinrich, Founded by, Leschziner, Michael A., Series editor, Periaux, Jacques, Series editor, Pirozzoli, Sergio, Series editor, Rizzi, Arthur, Series editor, Roux, Bernard, Series editor, Shokin, Yurii I., Series editor, and Heinrich, Ralf, editor

Published
2018
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17. CFD Simulations of the Pazy Wing in Support of the Third Aeroelastic Prediction Workshop

Author

Fehrs, Michael (author), Ritter, Markus (author), Helm, Sebastian (author), Mertens, C. (author), Fehrs, Michael (author), Ritter, Markus (author), Helm, Sebastian (author), and Mertens, C. (author)

Abstract

The Pazy Wing test case is a benchmark for the investigation of aeroelastic effects at very large deflections. Tip deformations in the order of 50% span were measured in wind tunnel tests, which renders this model highly attractive for the validation of numerical aeroelastic methods and tools for geometrically nonlinear, large deflection analyses. Due to the low flow velocity (up to 60 m/s) and the simple geometry of the wing, simulation programs based on subsonic, linear potential aerodynamic solvers (such as VLM and UVLM) are an ideal basis for static coupling and flutter simulations. However, more comprehensive analyses with focus on aerodynamic nonlinearities such as stall and limit cycle oscillations (which have been observed in several wind tunnel tests) are attractive research topics but call for advanced aerodynamic methods. The present work is thus focused on high fidelity aerodynamic simulations of the Pazy Wing using RANS with transition modeling in order to capture nonlinear effects originating from the particular shape of the wing and the low Reynolds number. It is a collaborative activity of DLR, NASA, and TU Delft and supports the Large Deflection Working Group (LDWG), which is one of the sub-groups of the 3rd Aeroelastic Prediction Workshop (AePW3)., Aerodynamics

Published
2022

18. Abschlussbericht zum Verbundprojekt InKola

Author

Hauer, Ines, Tayyab , Muhammad, Helm, Sebastian, Heuer, Maik, Brinken, Julius, Müller, Marcel, Schmidtke, Niels, Hildebrand, Nicole, Wagener, Sven, and Holzberger, Mathias

Abstract

Im Mittelpunkt des Vorhabens InKola „Infrastrukturkopplung – Platzierung und Betrieb von Ladestationen aus Verkehrs- und Energienetzsicht“ steht die infrastrukturübergreifende Planung und der Betrieb für Verkehr- und Energiesysteme. Das Ziel ist es, zusammen der Stadt Burg ein anwendungsorientiertes Konzept zur optimalen Platzierung, Versorgung und Betrieb von Ladeinfrastruktur aus Netz- und Verkehrssicht unter Einbindung erneuerbarer Erzeugung zu entwickeln, und an ausgewählten Standorten in der Stadt Burg Ladeinfrastruktur zu installieren., Res Electricae Magdeburgenses. Magdeburger Forum zur Elektrotechnik, 87

Published
2022
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19. Numerical Simulation of the Common Research Model with Natural Laminar Flow

Author

Helm, Sebastian, Fehrs, Michael, Kaiser, Christoph, Krimmelbein, Normann, and Krumbein, Andreas

Subjects
laminar wing simulation, Aerospace Engineering, turbulent wedges, static aeroelastic deformation
Abstract

The Common Research Model with natural laminar flow (CRM-NLF) shows promising numerical and experimental results. This work aims at understanding the aerodynamic characteristics of the CRM-NLF wing under wind-tunnel conditions. The significant effects of turbulent wedges and static aeroelastic deformation are shown. Fluid–structure coupled simulations including laminar–turbulent transition with turbulent wedges show an improved agreement with wind-tunnel data made available by NASA when both effects are considered.

Published
2022
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20. CFD Simulations of the Pazy Wing in Support of the Third Aeroelastic Prediction Workshop

Author

Fehrs, Michael, Ritter, Markus Raimund, Helm, Sebastian, and Mertens, Christoph

Subjects
SST Turbulence Model, Low Reynolds number aerodynamics, Pazy Wing, Aeroelastic Prediction Workshop, Low Reynolds, CFD, Free Transition, Gamma Transition Model
Abstract

The Pazy Wing test case is a benchmark for the investigation of aeroelastic effects at very large deflections. Tip deformations in the order of 50% span were measured in wind tunnel tests, which renders this model highly attractive for the validation of numerical aeroelastic methods and tools for geometrically nonlinear, large deflection analyses. Due to the low flow velocity (up to 60 m/s) and the simple geometry of the wing, simulation programs based on subsonic, linear potential aerodynamic solvers (such as VLM and UVLM) are an ideal basis for static coupling and flutter simulations. However, more comprehensive analyses with focus on aerodynamic nonlinearities such as stall and limit cycle oscillations (which have been observed in several wind tunnel tests) are attractive research topics but call for advanced aerodynamic methods. The present work is thus focused on high fidelity aerodynamic simulations of the Pazy Wing using RANS with transition modeling in order to capture nonlinear effects originating from the particular shape of the wing and the low Reynolds number. It is a collaborative activity of DLR, NASA, and TU Delft and supports the Large Deflection Working Group (LDWG), which is one of the sub-groups of the 3rd Aeroelastic Prediction Workshop (AePW3).

Published
2022

21. Numerical Simulation of the Common Research Model with Natural Laminar Flow.

Author

Helm, Sebastian, Fehrs, Michael, Kaiser, Christoph, Krimmelbein, Normann, and Krumbein, Andreas

Abstract

The Common Research Model with natural laminar flow (CRM-NLF) shows promising numerical and experimental results. This work aims at understanding the aerodynamic characteristics of the CRM-NLF wing under wind-tunnel conditions. The significant effects of turbulent wedges and static aeroelastic deformation are shown. Fluid-structure coupled simulations including laminar-turbulent transition with turbulent wedges show an improved agreement with wind-tunnel data made available by NASA when both effects are considered. [ABSTRACT FROM AUTHOR]

Published
2023
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27. Power and Energy Student Summit 2019

Author

Helm, Sebastian, Jonte Dancker, Fritsch, Martin, and Schröter, Tamara

Subjects
Elektroenergieversorgung
Abstract

The book includes a short description of the conference program of the "Power and Energy Student Summit 2019". The conference, which is orgaized for students in the area of electric power systems, covers topics such as renewable energy, high voltage technology, grid control and network planning, power quality, HVDC and FACTS as well as protection technology. Besides the overview of the conference venue, activites and the time schedule, the book includes all papers presented at the conference., Res Electricae Magdeburgenses. Magdeburger Forum zur Elektrotechnik, Band 77, 224 S.

Published
2019
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33. The effect of Parodontax® on the MMP-8 concentration in gingivitis patients.

Author

Ehlers V, Helm S, Kasaj A, and Willershausen B

Subjects
Adult, Dental Plaque prevention & control, Female, Humans, Male, Matrix Metalloproteinase 8 analysis, Middle Aged, Plant Extracts therapeutic use, Plant Preparations therapeutic use, Young Adult, Gingival Crevicular Fluid enzymology, Gingivitis drug therapy, Gingivitis enzymology, Matrix Metalloproteinase 8 metabolism, Mouthwashes therapeutic use, Phytotherapy, Sodium Bicarbonate therapeutic use
Abstract

The aim of the study was to evaluate the efficacy of Parodontax® (GlaxoSmith-Kline, Bühl, Germany) on the signs gingival inflammation and the enzyme activity of matrix metalloproteinase-8 (aMMP-8) in the gingival crevicular fluid. After approval by the ethics commission, a total of 50 volunteers participated in the study; group 1 (n = 25, age: 43 ± 12 years) with moderate gingivitis (BOP +) and group 2 (n = 25, age: 29 ± 11 years) with clinically healthy gingival conditions (BOP -). After obtaining anamnestic data, the dental examination included assessment of oral hygiene (Quigley & Hein 1962), gingival inflammation (Saxer & Mühlemann 1975), probing pocket depth and clinical attachment level. Gingival crevicular fluid was collected from both groups. A quantitative assessment of aMMP-8 in the gingival crevicular fluid samples was performed (DentoAnalyzer, Dentognostics GmbH, Jena, Germany). Study participants were instructed to use only Parodontax®. After three weeks, all parameters were measured again. The aMMP-8 values of group 1 were significantly reduced after the use of Parodontax® toothpaste and mouthwash (p < 0.001; baseline median 41.25 ± 38.16 ng/ml, final post-treatment median 7.73 ± 7.58 ng/ml aMMP-8 eluate; group 2: baseline median 3.75 ± 3.16 ng/ml, final post-treatment median 3.73 ± 1.54 ng/ml aMMP-8 eluate). Gingival inflammation and plaque accumulation were reduced. It was shown that Parodontax® was effective in reducing the enzymatic activity of inflammation.

Published
2011

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