Markus Trenker

• Doctor of Engineering
• reseacher lecturer at University of Applied Scienes Wiener Neustadt

Aerodynamic shape design has a long history of extensive and detailed development, including different methods of optimization based on the various technologies that have been made available over the years, ranging from simple manual iteration to numerical inverse design. As artificial intelligence sees increasing popularity, it has also penetrated...

Due to the rapid development of military unmanned air vehicles and especially due to associated progresses in control and guidance technology it might be beneficial to use these technologies for civilian air transport, especially for unmanned cargo air frighters (UCAF). In particular, from the control and guidance technology side most of the challe...

Das Nachschlagewerk befasst sich mit der Manipulation (Technik und Verfahren) von körperlichen Gegenständen (Werkstücke, Werkzeuge) in Industrie (Industrierobotertechnik, Endeffektoren), Handwerk (Manipulatoren), Montage (Montageautomaten, Transfersysteme) und im persönlichen Umfeld (Serviceroboter). Dazu werden jeweils die technischen Mittel, dere...

Since the time numerical simulation tools have been introduced in design engineering the requirements on their capabilities have increased steadily. Computer resources and people's expectations on the simulation itself have reached a high level over the years. More powerful computers are used to process meshes with several million cells. 3-d time a...

Combustion of hydrogen in the boundary layer of a simplified scramjet model is investigated. The analytical model for combustion is introduced for a flat plate in a turbulent boundary layer. Investigations are carried out for a fixed scramjet geometry and Mach 10 at 36 km altitude. Fuel is injected in the combustor as well as into the boundary laye...

Modifications to design of airfoils for use in unsteady transonic flows are carried out by means of realistic geometry modeling and systematic removal of recompression shocks in the transonic region. A procedure for designing deformable airfoils for helicopter rotor blades is introduced. A baseline shock-free airfoil is created by combining systema...

We consider the two-dimensional high/moderate Reynolds-number flow around a slender airfoil at small angles of attack. Special emphasis is placed on leading edge separation and the associated breakdown of the steady solution of the governing equations. A comparison between the predictions of the viscous/inviscid interaction theory of marginal separ...

The discipline of geometry has been found to be an indispensible partner of computational analysis, design and optimization in aerodynamics, especially in the regime of transonic flow: Here the fine details of the surface, influencing smoothness of the curvature count in successfully arriving at a flow quality ensuring improved aerodynamic efficien...

Modifications to design of airfoils for use in unsteady transonic flow are carried out by means of realistic geometry modeling and systematic removal of recompression shocks in the transonic flow regime.

Refined concepts for high speed flow control in aerospace and turbomachinery applications sug- gest a retrospective look onto theoretical results of pre-CFD time for special airfoils, wings, bod- ies and internal flows because such results exhibit theoretically idealized behavior for some aspects in practical applications. Novel control mechanisms...

Classical analytic models for the theoretical behavior of transonic flows have guided the development of numerical simulation of practically relevant flows. But while operational successfully for the usual applications (conventional configuration high speed aerodynamics), CFD codes fail frequently once detailed information regarding even just invis...

Refined concepts for high speed flow control in aerospace and turbomachinery applications suggest a retrospective look onto theoretical results of pre-CFD time for special airfoils, wings, bodies and internal flows because such results exhibit theoretically idealized behavior for some aspects in practical applications. Novel control mechanisms brin...

In this work the numerical design of airfoils, using both deformation and adaption in transonic flow will be examined. Since drag reduction is one of main tasks in the design of aerodynamic components such as aircraft wings and helicopter rotor blades, solutions are sought which fulfill these requirements. Airfoil deformation is used in order to pr...

Design modifications to airfoils in unsteady transonic flow are carried out by means of realistic geometry modeling and systematic transonic design removal of recompression shocks. Results of systematic design lead to simplified shape modification functions shortcutting the use of 2D steady and unsteady numerical methods and help extending design k...

The present paper describes two different experiments performed in a transonic wind tunnel facility at DLR-Goettingen. The first experiment was conducted in order to study compressible vortices behind a cylinder and investigating the feasibility of combining two different measuring techniques: the Background Oriented Schlieren (BOS) technique and t...

Higher Harmonic Control (HHC) and Individual Blade Control (IBC) technologies have reduced noise and vibration levels of rotors considerably. Further improvements are expected with on-blade devices, i.e. the rotor blade is active only along a limited spanwise section of high aerodynamic efficiency. On both advancing and retreating sides of the roto...

Snow accretion on a train's undercarriage is investigated. Accumulation of snow on essential devices such as air inlets and outlets of the engine cooling system which are mounted underfloor can lead to overheating and malfunction and finally to serious damage. The simulation is performed by solving the flow field around the train in combination wit...

Thesis (Ph. D.)--Universitat Wien, 2001.