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TU Berlin

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Lewin Stein (Dr. rer. nat.)

Lupe

Lewin.Stein{a)TU-Berlin.DE
+49 (0) 30 314 21152

Office: VWS 120
Post: TU-Berlin, Sekr. MB1
Müller-Breslau-Straße 15
10623 Berlin

Research

  • Fluid-Structure-Sound Interaction
  • Acoustic Modelling
  • Wave Field Synthesis
  • Turbulent Boundary and Shear Layers
  • Computational Fluid Dynamics: Direct Numerical Simulation, High Performance Computing

Projects

Supercomputer Projects

Journal Articles

An Acoustic Model of a Helmholtz Resonator under a Grazing Turbulent Boundary Layer
Citation key steinAcousticModel19
Author Stein, Lewin and Sesterhenn, Jörn
Pages 2013-2029
Year 2019
Journal Acta Mechanica
Volume 230
Number 6
Abstract Acoustic models of resonant duct systems with turbulent flow depend on fitted constants based on expensive experimental test series. We introduce a new model of a resonant cavity, flush mounted in a duct or flat plate, under grazing turbulent flow. Based on previous work by Goody, Howe and Golliard, we present a more universal model where the constants are replaced by physically significant parameters. This enables the user to understand and to trace back how a modification of design parameters (geometry, fluid condition) will affect acoustic properties. The derivation of the model is supported by a detailed three-dimensional direct numerical simulation as well as an experimental test series. We show that the model is valid for low Mach number flows (M = 0.01-0.14) and for low frequencies (below higher transverse cavity modes). Hence, within this range, no expensive simulation or experiment is needed any longer to predict the sound spectrum. In principle, the model is applicable to arbitrary geometries: Just the provided definitions need to be applied to update the significant parameters. Utilizing the lumped-element method, the model consists of exchangeable elements and guarantees a flexible use. Even though the model is linear, resonance conditions between acoustic cavity modes and fluid dynamic unstable modes are correctly predicted.
Link to publication Download Bibtex entry

Teaching

Lecture Activities

Supervised Master Theses

  • Gourdazi, A. (2018, BMW cooperation). Temperature effects on aeroacoustics of a subsonic jet flow from an open pipe
  • Jarolin, K. (2017). Treatment of sharp edges for conservative finite difference methods
  • Kruse, P. (2015). Helmholtz resonator dynamics examined by a modal decomposition

Personal Information

Education

Research Stays

  • 2010 Yale University (USA) with Prof. Hong Tang (RISE-DAAD Research Scholar)
  • 2009 Tohoku University (Japan) with Prof. Riichiro Saito (German Academic Scholarship Foundation Grant)

Zusatzinformationen / Extras

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