DNS of inertial wave attractors in a librating annulus with height-dependent gap width

etc15 Tracking Number 134

Presentation:
Session: Geophysical and astrophysical turbulence 1
Room: Room C
Session start: 10:30 Thu 27 Aug 2015

Marten Klein   marten.klein@tu-cottbus.de
Affifliation: LS Umweltmeteorologie, BTU Cottbus - Senftenberg
Abouzar Ghasemi Varnamkhasti   ghasemiv@tu-cottbus.de
Affifliation: LS Umweltmeteorologie, BTU Cottbus - Senftenberg
Torsten Seelig   seelig@tu-cottbus.de
Affifliation: LS Strömungsmechanik und Aerodynamik, BTU Cottbus - Senftenberg
Ion Dan Borcia   borciai@tu-cottbus.de
Affifliation: LS Strömungsmechanik und Aerodynamik, BTU Cottbus - Senftenberg
Uwe Harlander   haruwe@tu-cottbus.de
Affifliation: LS Strömungsmechanik und Aerodynamik, BTU Cottbus - Senftenberg
Andreas Will   will@tu-cottbus.de
Affifliation: LS Umweltmeteorologie, BTU Cottbus - Senftenberg

Topics: - Geophysical and astrophysical turbulence, - Vortex dynamics and structure formation, - Wall bounded flows

Abstract:

Direct numerical simulations (DNS) of inertial wave attractors have been carried out in a librating Taylor-Couette system with broken mirror symmetry in the radial-axial cross-section. The inertial wave excitation mechanism and its localisation at the edges was clarified by applying boundary layer theory. Additional resonance peaks in the simulated response spectra were found to agree with low-order wave attractors obtained by geometric ray tracing. Numerics and theory are in qualitative agreement with recent lab experiments.