Dynamic Mode Decomposition of Wake Flow Structures for Supersonic Oscillating Genesis Atmospheric Entry Capsule

ORAL

Abstract

Atmospheric entry capsules experience significant oscillations and tumbling during deceleration, which can jeopardize successful parachute deployment and overall mission success.

This study employs Dynamic Mode Decomposition (DMD) to analyze the wake flow structures of a supersonic reentry vehicle with one degree of freedom motion at Mach 1.44.

Free-Flight CFD (FFCFD) data from the US3D solver is utilized to construct the DMD analysis data matrix. Our results identified two dominant modes in the wake: a high-amplitude, damped recompression wave mode, and a low-amplitude, undamped recirculation bubble near-wake mode. The more energetic recompression wave mode dominates, correlating with the observed damped oscillatory behavior of the vehicle at Mach 1.44.

These findings offer critical insights into the aerodynamic stability of atmospheric entry vehicles, informing design strategies to mitigate oscillatory instabilities and enhance mission safety.

–

Publication: [1] Ohmichi, Y., Kobayashi, K. and Kanazaki, M., 2019. Numerical investigation of wake structures of an atmospheric entry capsule by modal analysis. Physics of Fluids, 31(7).
[2] Teramoto, S., Hiraki, K. and Fujii, K., 2001. Numerical analysis of dynamic stability of a reentry capsule at transonic speeds. AIAA journal, 39(4), pp.646-653.
[3] Kazemba, C.D., Braun, R.D., Schoenenberger, M. and Clark, I.G., 2015. Dynamic stability analysis of blunt-body entry vehicles using time-lagged aftbody pitching moments. Journal of Spacecraft and Rockets, 52(2), pp.393-403.
[4] Romeo, S.A.S., Oz, F., Kassem, A., Kara, K. and San, O., 2024. An augmented physics informed neural network approach for blunt-body dynamics. Physics of Fluids, 36(1).
[5] Kobayashi, K., Ohmichi, Y. and Kanazaki, M., 2019. Modal decomposition analysis of subsonic unsteady flow around an atmospheric Entry capsule with forced oscillation. In AIAA Scitech 2019 Forum (p. 1851).
[6] Oz, F., Romeo, S. A. S., Kassem, A., Ekelschot, D., Schulz, J. C., Kazemba, C., San, O., and Kara, K., "Nonlinear Parameter
Estimation for Entry Capsule Dynamic Stability Analysis and Uncertainty Quantification," Journal of Spacecraft and Rockets,
2024. Under Review, 2024-01-A35998.

Presenters

  • Ashraf Kassem

    Oklahoma State University-Stillwater

Authors

  • Ashraf Kassem

    Oklahoma State University-Stillwater

  • Shafi Al Salman Romeo

    Oklahoma State University-Stillwater, Oklahoma State University

  • Bipin Tiwari

    University of Tennessee-Knoxville

  • Omer San

    University of Tennessee

  • Kursat Kara

    Oklahoma State University