Investigations of Unsteady Transonic and Supersonic Wake Flow of Generic Space Launcher Configurations Using Zonal RANS/LES and Dynamic Mode Decomposition

V. Statnikov (), T. Sayadi, M. Meinke, P. Schmid and W. Schröder
Additional contact information
V. Statnikov: RWTH Aachen University, Institute of Aerodynamics
T. Sayadi: RWTH Aachen University, Institute of Aerodynamics
M. Meinke: RWTH Aachen University, Institute of Aerodynamics
P. Schmid: RWTH Aachen University, Institute of Aerodynamics
W. Schröder: RWTH Aachen University, Institute of Aerodynamics

A chapter in High Performance Computing in Science and Engineering ‘14, 2015, pp 379-401 from Springer

Abstract: Abstract Dynamic mode decomposition (DMD) is applied to time-resolved results of zonal RANS/LES computations of three different axisymmetric generic space launcher configurations having freestream Mach numbers of 0. 7 and 6. 0. Two different after-body geometries consisting of an attached sting support mimicking an endless nozzle extension and an attached cylindrical after-expanding nozzle are considered. The distinguishing feature of the investigated configurations is the presence of a separation bubble in the wake region. The dynamics of the bubble and the dominant frequencies are analyzed using DMD. The results are then compared to the findings of spectral analysis and temporal filtering techniques. The transonic case displays distinct peaks in the Fourier transform spectra. We illustrate a close agreement between the frequencies of the DMD modes and the aforementioned peaks. From the shape of the DMD modes, it is deduced that most of the peaks are related to the dynamics of the separation bubble and the corresponding shear layer. The same geometry with higher Mach number shows the existence of two distinct DMD modes of axisymmetric and helical nature, respectively. The presence of the helical mode is illustrated through composite DMD of the cylindrical velocity components. Finally, when considering the free-flight configuration we were able to identify DMD modes with frequency Sr D ≈ 1 which results in the flapping motion of the shear layer and a mode of a lower frequency which causes the breathing of the recirculation bubble.

Keywords: Shear Layer; Large Eddy Simulation; Discrete Fourier Transformation; Streamwise Velocity; Separation Bubble (search for similar items in EconPapers)
Date: 2015
References: Add references at CitEc
Citations:

There are no downloads for this item, see the EconPapers FAQ for hints about obtaining it.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-319-10810-0_26

Ordering information: This item can be ordered from
http://www.springer.com/9783319108100

DOI: 10.1007/978-3-319-10810-0_26

Access Statistics for this chapter

More chapters in Springer Books from Springer
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().