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15 Submissions in this community.

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Film265: Report on Achieved Quality Improvements

Álvarez-Mesa, Mauricio; Sanz-Rodríguez, Sergio (2016-06-30)

This document presents the results of the informal video quality subjective tests performed in the context of the Film265 project. In this project a new implementation of the HEVC/H.265 video codin...

Film265: Report on Achieved Quality Improvements: Public Version. Research Data

Álvarez-Mesa, Mauricio; Sanz Rodríguez, Sergio (2016-06-30)

This data set contains the results of the informal video quality subjective tests performed in the context of the Film265 project. In this project a new implementation of the HEVC/H.265 video codin...

Data-driven interpolation of dynamical systems with delay

Schulze, Philipp; Unger, Benjamin (2015)

We present a data-driven realization for systems with delay, which generalizes the Loewner framework. The realization is obtained with low computational cost directly from measured data of the tran...

A Matlab toolbox for the regularization of descriptor systems arising from generalized realization procedures

Binder, Amelie; Mehrmann, Volker; Miedlar, Agnieszka; Schulze, Philipp (2015)

In this report we introduce a Matlab toolbox for the regularization of descriptor systems. We apply it, in particular, for systems resulting from the generalized realization procedure of [16], whic...

The shifted proper orthogonal decomposition

Reiss, Julius; Schulze, Philipp; Sesterhenn, Jörn (2015)

Transport-dominated phenomena provide a challenge for common mode-based model reduction approaches. We present a model reduction method, which extends the proper orthogonal decomposition (POD) by i...

Port-Hamiltonian realizations of linear time invariant systems

Beattie, Christopher; Mehrmann, Volker; Xu, Hongguo (2015)

The question when a general linear time invariant control system is equivalent to a port-Hamiltonian systems is answered. Several equivalent characterizations are derived which extend the character...

On the port-Hamiltonian structure of the Navier-Stokes equations for reactive flows

Altmann, Robert; Schulze, Philipp (2016)

We consider the problem of finding an energy-based formulation of the Navier-Stokes equations for reactive flows. These equations occur in various applications, e. g., in combustion engines or chem...

Numerical solution of singularly perturbed convection-diffusion-reaction problems with two small parameters

Das, Pratibhamoy; Mehrmann, Volker (2015)

This paper discusses the numerical solution of 1-D convection-diffusion-reaction problems that are singularly perturbed with two small parameters using a new mesh-adaptive upwind scheme that adapts...

Shockless explosion combustion

Bobusch, Bernhard C.; Berndt, Phillip; Paschereit, Christian Oliver; Klein, Rupert (2014-09-30)

Constant volume combustion (CVC) in gas turbines is a promising way to achieve a step change in the efficiency of such systems. The most widely investigated technique to implement CVC in gas turbin...

Investigation of Fluidic Devices for Mixing Enhancement for the Shockless Explosion Combustion Process

Bobusch, Bernhard; Berndt, Phillip; Paschereit, Christian Oliver; Klein, Rupert (2014-09)

Fuel-air mixing is a crucial process in low emission combustion systems. A higher mixing quality leads to lower emissions and higher combustion efficiencies. Especially for the innovative constant ...

Experimental investigation of a turbine sealing cavity exposed to free stream pressure fluctuation

Schliwka, Tobias; Malzacher, Leonie; Chemnitz, Silvio; Peitsch, Dieter (2014-09-10)

The current investigation examines the impact of a new pulsed unsteady combustion to the turbine sealing cavity, which prevents hot gas ingestion into the inner machine. Sealing flow is ensured by ...

Active Flow Control by Adaptive Blade Systems in Periodic Unsteady Flow Conditions

Hammer, Steffen; Phan, Dat Tien; Peter, Julija; Werder, Tobias; Meyer, Robert; Liebich, Robert; Thamsen, Paul Uwe (2014-09-10)

A test stand to investigate the rotor-stator interaction of a compressor stage is presented. This water channel allows to investigate the influence of wake depressions and choking to a stator casca...

Experimental Investigation of a 7 by 7 Nozzle Jet Array for Dynamic Impingement Cooling

Haucke, Frank; Kroll, Henning; Peltzer, Inken; Nitsche, Wolfgang (2014-09-10)

Dynamic impingement cooling is a promising way for more efficient exploitation of cooling air in highly heat charged environments. In many applications the deployed impinging jets are subjected to ...

Review: Active Control of Shock-associated Unsteady Flow Phenomena in Aeroengines - Suppression Techniques for Transonic Cascade Flutter and Supersonic Jet Noise -

Watanabe, Toshinori (2014-09-10)

Active control techniques for cascade flutter suppression and supersonic jet noise reduction were studied in the University of Tokyo. For flutter suppression, piezoelectric devices were installed o...

Internal Flow Physics of a Fluidic Oscillator in the Transition Regime

Gregory, James W.; Tomac, Mehmet N. (2014-09)

An experimental investigation of the underlying flow physics of a dual jet interaction fluidic oscillator has been conducted in the transition regime for a Reynolds number of 1680. The transition r...