Blättern Naturwissenschaften, Mathematik und Informatik nach Betreuer & Gutachter "Eckelmann, Helmut Prof. Dr."
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The significance of coherent flow structures for the turbulent mixing in wall-bounded flows
(2004-07-28)For the identification and characterisation of coherent flow structures in turbulent boundary layers and for the examination of the interaction processes between these structures, a flat ... -
Active cancellation of 3D Tollmien-Schlichting waves in the presence of sound and vibrations.
(2002-12-13)In order to delay the laminar-turbulent transition in a boundary layer flow, the cancellation of 2D- and 3D instability waves by artificially excited counter-disturbances is investigated. ... -
Investigation of transition scenarios in boundary-layer flows
(2002-04-05)Laminar-turbulent transition mechanisms triggered by crossflow instability in three-dimensional, accelerated boundary-layer flows are investigated us- ing numerical methods of stability analysis. The investigations are ... -
Zeitlich modulierte Statistik der periodisch gestörten turbulenten Kanalströmung
(2002-03-25)The turbulent channel flow is subjected to a temporal change of the boundary conditions, either by periodic variation of a longitudinal wall speed or, alternatively, by periodic variation ... -
Experimentelle und numerische Untersuchungen zur Ausbreitung von Volumenstörungen in thermischen Plumes.
(2002-03-01)The propagation of wavelike disturbances in thermal plumes conduit is studied in laboratory experiments and numerical simulations. In experiments thermal plumes are created by injecting hot ... -
Untersuchung der Strukturen von künstlich angeregten transitionellen Plattengrenzschichtströmungen mit Hilfe der Stereo und Multiplane Particle Image Velocimetry
(2001-12-05)Stereoscopic and Multi-plane PIV measurements on artificially excited transitional boundary layer flows along a flat plate will be presented. The experimental results are focused on the ... -
Entwurfsaerodynamische Studien an Tragflügelkonfigurationen im Hochgeschwindigkeitsbereich mit evolutionären Algorithmen
(2001-11-06)Not available. -
Dynamische Stabilisierung einer Grenzschichtströmung unter Berücksichtigung nichtlinearer Störausbreitungsprozesse
(2001-10-16)In order to delay the laminar-turbulent transition in a boundary-layer flow, the compensation of instability waves by artificially excited disturbances is under investigation. To generate ... -
Experimentelle Untersuchungen des laminar-turbulenten Überganges der Zylindergrenzschichtströmung
(2001-07-18)The spatio-temporal separation of transitional boundary-layer of the cross-stream cylinder-flow is explored in the subcritical up to the transcritical Reynolds number regime. In order to ... -
Mehrkomponenten-Laser-Doppler-Anemometer-Messungen in einer drallbehafteten Rohr- und Brennkammerströmung
(2001-06-06)Swirl flows, i.e. axisymmetric jet flows with a non zero circumferential velocity, are important in technology as well as in nature. Swirl flows occur in a wide range of applications like ... -
Der Einfluss von Rotation auf Konvektion und Kristallisation eines binären eutektischen Systems in Hinblick auf den Erdkern
(2000-09-22)In the cooling Earth the fluid outer core consists of a molten alloy over the solidifying inner core. Here, compositional convection due to the preferential solidification of the heavy phase ... -
Numerische Untersuchungen zur Wechselwirkung von Mantelplumes mit Mittelozeanischen Rücken
(2000-08-21)The interaction of mantle plumes with mid-ocean ridges is investigated in 3-D numerical convection models. A new numerical method for solving convection problems with variable viscosity in ... -
Numerische Untersuchung zur instationären Kutta-Bedingung
(2000-08-02) -
Investigation of transition scenarios in boundary-layer flows
(1999)Laminar-turbulent transition mechanisms triggered by crossflow instability in three-dimensional, accelerated boundary-layer flows are investigated using numerical methods of stability anaylsis. The investigations are based ...