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Unsteady evolution of distributed roughness-induced vortices under re-entry conditions.
- Source :
- CEAS Space Journal; Nov2023, Vol. 15 Issue 6, p971-988, 18p
- Publication Year :
- 2023
-
Abstract
- This study investigates a re-entry scenario of an Apollo-like space capsule with Direct Numerical Simulations (DNS). The simulation includes the chemical equilibrium gas model. Cross-flow-like vortices are induced through random distributed roughness patches on the capsule surface. Two different machine learning methods are used to predict the maximum vorticity magnitude downstream of a pseudo-random roughness patch, the wall-normal location of the vortex core and spanwise and wall-normal gradient maxima of u. A large DNS database is formed for training and testing of the neural networks. In order to understand the influence of the vorticity magnitude on the transition process, local one-dimensional inviscid (LODI) relations are used to describe perturbations at the inflow. The disturbance evolution in the streamwise direction is analysed with a two-dimensional Fourier transformation in time and space. We show how the vorticity magnitudes of the cross-flow-like vortices, spanwise and wall-normal derivatives of the streamwise velocity influence the transition location. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18682502
- Volume :
- 15
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- CEAS Space Journal
- Publication Type :
- Academic Journal
- Accession number :
- 174206248
- Full Text :
- https://doi.org/10.1007/s12567-023-00510-2