Bernd R. Noack

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Sickle cell disease is among hereditary diseases with evidence that early diagnoses and treatment improves the clinical outcome. So far sickle cell disease has not been included in the German newborn screening program despite immigration from countries with populations at risk. To determine the birth prevalence we tested 17,018 newborns. High pressure(More)
The Finite-time Lyapunov Exponent (FTLE) is a measure for the rate of separation of particles in time-dependent flow fields. It provides a valuable tool for the analysis of unsteady flows. Commonly it is defined based on the flow map, analyzing the separation of trajectories of nearby particles over a finite-time span. This paper proposes a localized(More)
Maciej J. Balajewicz1,†, Earl H. Dowell2 and Bernd R. Noack3 1Department of Aeronautics and Astronautics, Stanford University, Stanford, CA 94305, USA 2Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA 3Institut PPRIME, CNRS – Université de Poitiers – ENSMA, UPR 3346, Départment Fluides, Thermique,(More)
A reduced-order modelling (ROM) strategy is crucial to achieve model-based control in a wide class of flow configurations. In turbulence, ROMs are mostly derived by Galerkin projection of first-principles equations onto the proper orthogonal decomposition (POD) modes. These POD ROMs are known to be relatively fragile when used for control design. To(More)
Since 2014, a considerable increase in Plasmodium vivax malaria has been observed in Germany. The majority of cases was seen in Eritrean refugees. All patients with P. vivax malaria admitted to the University Medical Centre Hamburg-Eppendorf Germany from 2011 until August 2015 were retrospectively identified by the hospital coding system and data was(More)
This paper proposes a Galilean invariant generalization of critical points of vector field topology for 2D time-dependent flows. The approach is based upon a Lagrangian consideration of fluid particle motion. It extracts long-living features, like saddles and centers, and filters out short-living local structures. This is well suited for analysis of(More)
A principal challenge in the use of empirical proper orthogonal decomposition (POD) Galerkin models for feedback control design in fluid flow systems is their typical fragility and poor dynamic envelope. Closed loop performance and optimized sensor(s) location are significantly improved by use of interpolated POD modes from a succession of low dimensional(More)
Michael Schlegel1†, Bernd R. Noack2, Peter Jordan2, Andreas Dillmann3, Elmar Gröschel4,5, Wolfgang Schröder4, Mingjun Wei6, Jonathan B. Freund7, Oliver Lehmann8 and Gilead Tadmor8 1 Institut für Strömungsmechanik und Technische Akustik, Technische Universität Berlin MB1, Straße des 17. Juni 135, D-10623 Berlin, Germany 2 Institut P, CNRS–Université de(More)
We review a strategy for low- and least-order Galerkin models suitable for the design of closed-loop stabilization of wakes. These low-order models are based on a fixed set of dominant coherent structures and tend to be incurably fragile owing to two challenges. Firstly, they miss the important stabilizing effects of interactions with the base flow and(More)