### Abstract

The generation and early evolution of boundary layer transitional instabilities, named Tollmien- Schlichting (T-S) waves, in airfoil cascade flows are studied. The energy exchange between the mean flow and the flow instabilities is computed by performing Direct Numerical Simulation of the fluid flow governing equations and by calculating the fluctuating kinetic energy (FKE) budget within the separated boundary layer. The driving role of the FKE production in the wavelength modulation process associated to the receptivity phenomenon, i.e., the generation of T-S waves, is demonstrated. The FKE production largely hastens the wavelength modulation around the inflection point of the mean velocity profile across the boundary layer. Above the inflection point, the fluctuating pressure field favors the energy transport and provides the energy necessary to convect the instabilities out of the boundary layer. The evolution of the T-S waves depicts an asymmetric distribution of the production term in the transverse direction, i.e., in the lower half of the boundary layer the mean flow provides energy to the instabilities while the opposite occurs in the upper half.

Original language | English |
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Title of host publication | 29th AIAA Fluid Dynamics Conference |

Publisher | American Institute of Aeronautics and Astronautics Inc. |

Pages | 1-8 |

Number of pages | 8 |

ISBN (Print) | 9780000000002 |

DOIs | |

Publication status | Published - 1998 |

Externally published | Yes |

Event | 29th AIAA Fluid Dynamics Conference - Albuquerque, United States Duration: Jun 15 1998 → Jun 18 1998 |

### Other

Other | 29th AIAA Fluid Dynamics Conference |
---|---|

Country | United States |

City | Albuquerque |

Period | 6/15/98 → 6/18/98 |

### Fingerprint

### ASJC Scopus subject areas

- Engineering (miscellaneous)
- Aerospace Engineering

### Cite this

*29th AIAA Fluid Dynamics Conference*(pp. 1-8). American Institute of Aeronautics and Astronautics Inc.. https://doi.org/10.2514/6.1998-2560

**Oscillatory momentum transport in cascade transitional boundary layer flows.** / Rojas-Solòrzano, Luis R.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*29th AIAA Fluid Dynamics Conference.*American Institute of Aeronautics and Astronautics Inc., pp. 1-8, 29th AIAA Fluid Dynamics Conference, Albuquerque, United States, 6/15/98. https://doi.org/10.2514/6.1998-2560

}

TY - GEN

T1 - Oscillatory momentum transport in cascade transitional boundary layer flows

AU - Rojas-Solòrzano, Luis R.

PY - 1998

Y1 - 1998

N2 - The generation and early evolution of boundary layer transitional instabilities, named Tollmien- Schlichting (T-S) waves, in airfoil cascade flows are studied. The energy exchange between the mean flow and the flow instabilities is computed by performing Direct Numerical Simulation of the fluid flow governing equations and by calculating the fluctuating kinetic energy (FKE) budget within the separated boundary layer. The driving role of the FKE production in the wavelength modulation process associated to the receptivity phenomenon, i.e., the generation of T-S waves, is demonstrated. The FKE production largely hastens the wavelength modulation around the inflection point of the mean velocity profile across the boundary layer. Above the inflection point, the fluctuating pressure field favors the energy transport and provides the energy necessary to convect the instabilities out of the boundary layer. The evolution of the T-S waves depicts an asymmetric distribution of the production term in the transverse direction, i.e., in the lower half of the boundary layer the mean flow provides energy to the instabilities while the opposite occurs in the upper half.

AB - The generation and early evolution of boundary layer transitional instabilities, named Tollmien- Schlichting (T-S) waves, in airfoil cascade flows are studied. The energy exchange between the mean flow and the flow instabilities is computed by performing Direct Numerical Simulation of the fluid flow governing equations and by calculating the fluctuating kinetic energy (FKE) budget within the separated boundary layer. The driving role of the FKE production in the wavelength modulation process associated to the receptivity phenomenon, i.e., the generation of T-S waves, is demonstrated. The FKE production largely hastens the wavelength modulation around the inflection point of the mean velocity profile across the boundary layer. Above the inflection point, the fluctuating pressure field favors the energy transport and provides the energy necessary to convect the instabilities out of the boundary layer. The evolution of the T-S waves depicts an asymmetric distribution of the production term in the transverse direction, i.e., in the lower half of the boundary layer the mean flow provides energy to the instabilities while the opposite occurs in the upper half.

UR - http://www.scopus.com/inward/record.url?scp=84959331001&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84959331001&partnerID=8YFLogxK

U2 - 10.2514/6.1998-2560

DO - 10.2514/6.1998-2560

M3 - Conference contribution

SN - 9780000000002

SP - 1

EP - 8

BT - 29th AIAA Fluid Dynamics Conference

PB - American Institute of Aeronautics and Astronautics Inc.

ER -