TY  - JOUR
A1  - Fischer, Jan-Thomas
A1  - Kowalski, Julia
A1  - Pudasaini, Shiva P.
A1  - Miller, S. A.
T1  - Dynamic Avalanche Modeling in Natural Terrain
JF  - International Snow Science Workshop, Davos 2009, Proceedings ; Proc. ISSW 2009
N2  - The powerful avalanche simulation toolbox RAMMS (Rapid Mass Movements) is based on a depth-averaged
hydrodynamic system of equations with a Voellmy-Salm friction relation. The two empirical friction parameters
μ and �  correspond to a dry Coulomb friction and a viscous resistance, respectively. Although μ and � lack a
proper physical explanation, 60 years of acquired avalanche data in the Swiss Alps made a systematic calibration
possible. RAMMS can therefore successfully model avalanche flow depth, velocities, impact pressure and run
out distances. Pudasaini and Hutter (2003) have proposed extended, rigorously derived model equations that
account for local curvature and twist. A coordinate transformation into a reference system, applied to the actual
mountain topography of the natural avalanche path, is performed. The local curvature and the twist of the
avalanche path induce an additional term in the overburden pressure. This leads to a modification of the Coulomb
friction, the free-surface pressure gradient, the pressure induced by the channel, and the gravity components
along and normal to the curved and twisted reference surface. This eventually guides the flow dynamics and
deposits of avalanches. In the present study, we investigate the influence of curvature on avalanche flow in
real mountain terrain. Simulations of real avalanche paths are performed and compared for the different models
approaches. An algorithm to calculate curvature in real terrain is introduced in RAMMS. This leads to a curvature
dependent friction relation in an extended version of the Voellmy-Salm model equations. Our analysis provides
yet another step in interpreting the physical meaning and significance of the friction parameters used in the
RAMMS computational environment.
KW  - snow
KW  - avalanche
Y1  - 2009
SP  - 448
EP  - 452
ER  - 
TY  - JOUR
A1  - Pichler, A.
A1  - George, A.
A1  - Seiler, F.
A1  - Srulijes, J.
A1  - Havermann, Marc
T1  - Doppler Picture Velocimetry (DPV) applied to hypersonics
JF  - Shock Waves [Elektronische Ressource] : 26th International Symposium on Shock Waves, Volume 1 / edited by Klaus Hannemann, Friedrich Seiler
Y1  - 2009
SN  - 978-3-540-85168-4
N1  - International Symposium on Shock Waves ; (26 ; 2007.07.15-20 ; Göttingen) ; ISSW ; (26 ; 2007.07.15-20 ; Göttingen)
SP  - 503
EP  - 508
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Robinson, A. E.
A1  - Funke, Harald
A1  - Wagemakers, R.
A1  - Grossen, J.
A1  - Bosschaerts, W.
A1  - Hendrick, P.
T1  - Numerical and Experimental Investigation of a Micromix Combustor for a Hydrogen Fuelled μ-Scale Gas Turbine
JF  - Proceedings of the ASME Turbo Expo 2009 : : presented at the 2009 ASME Turbo Expo, June 8 - 12, 2009, Orlando, Florida, USA / sponsored by the International Gas Turbine Institute
Y1  - 2009
SN  - 9780791848869
N1  - GT2009-60061
SP  - 253
EP  - 262
PB  - ASME
CY  - New York, NY
ER  - 
TY  - JOUR
A1  - Wilson, T. L.
A1  - Blome, Hans-Joachim
T1  - The Pioneer anomaly and a rotating Gödel universe
JF  - Advances in Space Research
Y1  - 2009
SN  - 0273-1177
VL  - 44
IS  - 11
SP  - 1345
EP  - 1353
ER  - 
TY  - JOUR
A1  - Röth, Thilo
A1  - Kern, Daniel
A1  - Kirchner, Karsten
A1  - Vietor, Thomas
T1  - Flexbody : Baukastensystem für Karosseriestrukturen / Kern, Daniel ; Röth, Thilo ; Kirchner, Karsten ; Vietor, Thomas
JF  - Mobiles : Fachzeitschrift für Konstrukteure. 35 (2009), H. 2009/2010
Y1  - 2009
SP  - 73
EP  - 75
PB  - Hochsch. für Angewandte Wiss.
CY  - Hamburg
ER  - 
TY  - JOUR
A1  - Röth, Thilo
A1  - Nowack, Niels
A1  - Oberschelp, Christian
A1  - Lao, Bin
T1  - Gute Perspektiven für Stahl-Alumnium-Hybride im Automotivebereich / Nowack, Niels ; Oberschelp, Christian ; Lao, Bin ; Klaus, Gerald ; Bührig-Polaczek, Andreas ; Röth, Thilo
JF  - Giesserei : die Zeitschrift für Technik, Innovation und Management. 96 (2009), H. 5
Y1  - 2009
SN  - 0016-9765
SP  - 110
EP  - 123
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Ball, Andrew J.
A1  - Ulamec, Stephan
A1  - Price, Michael E.
T1  - A small mission for in situ exploration of a primitive binary near-Earth asteroid  / Ball, Andrew J. ; Ulamec, Stephan ; Dachwald, Bernd ; Price, Michael E. ; [u.a.]
JF  - Advances in Space Research. 43 (2009), H. 2
Y1  - 2009
SN  - 0273-1177
SP  - 317
EP  - 324
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Carnelli, Ian
A1  - Vasile, Massimiliano
T1  - Evolutionary Neurocontrol: A Novel Method for Low-Thrust Gravity-Assist Trajectory Optimization / Carnelli, Ian ; Dachwald, Bernd ; Vasile, Massimiliano
JF  - Journal of guidance control and dynamics. 32 (2009), H. 2
Y1  - 2009
SN  - 0731-5090
SP  - 616
EP  - 625
PB  - AIAA
CY  - Reston, Va.
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Ohndorf, A.
A1  - Gill, E.
T1  - Optimization of low-thrust Earth-Moon transfers using evolutionary neurocontrol  / Ohndorf, A. ; Dachwald, B. ; Gill, E.
JF  - IEEE Congress on Evolutionary Computation, 2009. CEC '09.
Y1  - 2009
SN  - 978-1-4244-2958-5
SP  - 358
EP  - 364
ER  -