The present work focuses on a numerical analysis of turbulent wake flows of generic space launcher configurations at transonic and supersonic freestream conditions using a combination of zonal turbulence modeling and dynamic mode decomposition (DMD). The zonal simulation approach is applied to efficiently obtain time-resolved high-fidelity flow field data. The objective of the subsequent modal analysis is to extract and scrutinize the underlying spatio-temporal modes that are responsible for the characteristic dynamic phenomena.
After a brief description of the zonal computational approach and verification of the implemented DMD algorithm along with different mode selection procedures, the results of the performed wake flow investigations are presented. The discussion is divided into two major parts, i.e., transonic and supersonic wakes, according to the essential differences in the flow physics between these two regimes. Detailed investigations are performed on generic axisymmetric “free-flight” configurations of an Ariane 5-like space launcher. To validate the complementary methodology applied for extended wake analyses, additional planar and supported generic wind tunnel models are investigated and compared to the corresponding experiments.
As conclusive remarks, the transferability of the obtained findings to other space launcher systems is discussed accompanied by an outlook for future investigations of space launcher wake flows and their controllability.