Numerical simulation of K-, N- and O-regime boundary-layer transition at early nonlinear stage
Journal Title: INCAS BULLETIN - Year 2019, Vol 11, Issue 3
Abstract
Boundary layer transition is usually associated with the amplification and breakdown of three-dimensional waves (3D waves). However, the details of the development of 3D waves in different transition regimes are not well resolved. The present study attempts to examine the transition process at early nonlinear stages of K-, N-, and O-regimes by the solution of nonlinear parabolized stability equations (NPSE). The spatial and temporal variations of streamwise velocity are compared at the one-spike stage. Timelines and material surfaces are presented using Lagrangian tracking method. The development of 3D waves are observed to contribute to the upward lift and downward sweep of flow behaviors, causing inflectional regions in the boundary layer. The evolution of material surfaces reveals that the nonlinear 3D wave manifests as a warped wave front in the near-wall region and as a soliton-like structure at the upper region of the boundary layer. The 3D wave structure is hypothesized as a soliton-like coherent structure. Markedly similar flow behaviors are observed between the regimes, which indicates a similar underlying physical mechanism.
Authors and Affiliations
Xian-Yang JIANG, Cunbiao LEE
Keywords
Related Articles
- EP ID EP630933
- DOI 10.13111/2066-8201.2019.11.3.7
- Views 81
- Downloads 0
PIO I-II tendencies case study. Part 1. Mathematical modeling
In the paper, a study is performed from the perspective of giving a method to reduce the conservatism of the well known PIO (Pilot-Induced Oscillation) criteria in predicting the susceptibility of an aircraft to this ver...
Deorbiting Upper-Stages in LEO at EOM using Solar Sails
This paper analyzes the possibility of deorbiting a launch vehicle upper-stage at end-of-mission from low Earth orbit through the use of a solar sail. Different solar sail sizes are taken into account. The analysis is ma...
Comment on the volume: RESEARCH TRENDS IN MECHANICS, Vol. 4 Editors: Ligia MUNTEANU, Veturia CHIROIU, Tudor SIRETEANU Editura Academiei Române, Bucureşti, 2010
CFD Analysis for Industrial Applications using xGrid Environment
Relevant CFD computations are performed in a GRID environment in order to evaluate this technology as a reliable infrastructure for HPSC for complex industrial applications. Several aspects of this environment are presen...
Sammon mapping for preliminary analysis in Hyperspectral Imagery
The main goal of this paper is to present the implementation of the Sammon algorithm developed for finding N points in a lower m-dimensional subspace, where the original points are from a high n-dimensional space. This m...