### Abstract

Studies the separation of a two-dimensional laminar boundary layer under the influence of an external adverse pressure gradient. A fraction timestep method was used, and three different Reynolds numbers were studied. Calculations for several suction strengths showed that above a critical suction strength of 0.12 (all Reynolds numbers) shedding of discrete vortices was evident. Examination of the unsteady separation structure showed that the frequency of shedding was influenced by the Reynolds number but not by the strength of the pressure gradient. The vortex shedding appears dominated by an inviscid instability. Study of the time averaged separation bubbles indicates that the bubbles have a structure similar to laminar separation bubbles produced in experiment. (C.J.U.)

Original language | English (US) |
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Title of host publication | LOW REYNOLDS NUMBER AERODYNAMICS. PROC. CONF., NOTRE DAME, U.S.A., JUNE 5-7, 1989 }EDITED BY T.J. MUELLER]. (LECTURE NOTES IN |

Publisher | Berlin, Germany, Springer-Verlag |

Pages | 82-92 |

Number of pages | 11 |

Edition | 54 ), Berlin, Germany, Springer-Verlag, 1989 |

ISBN (Print) | 0387518843, 9780387518848 |

State | Published - Jan 1 1989 |

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### All Science Journal Classification (ASJC) codes

- Engineering(all)

### Cite this

*LOW REYNOLDS NUMBER AERODYNAMICS. PROC. CONF., NOTRE DAME, U.S.A., JUNE 5-7, 1989 }EDITED BY T.J. MUELLER]. (LECTURE NOTES IN*(54 ), Berlin, Germany, Springer-Verlag, 1989 ed., pp. 82-92). Berlin, Germany, Springer-Verlag.

}

*LOW REYNOLDS NUMBER AERODYNAMICS. PROC. CONF., NOTRE DAME, U.S.A., JUNE 5-7, 1989 }EDITED BY T.J. MUELLER]. (LECTURE NOTES IN.*54 ), Berlin, Germany, Springer-Verlag, 1989 edn, Berlin, Germany, Springer-Verlag, pp. 82-92.

**The instability of two-dimensional laminar separation.** / Pauley, L. L.; Moin, P.; Reynolds, W. C.

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

TY - CHAP

T1 - The instability of two-dimensional laminar separation.

AU - Pauley, L. L.

AU - Moin, P.

AU - Reynolds, W. C.

PY - 1989/1/1

Y1 - 1989/1/1

N2 - Studies the separation of a two-dimensional laminar boundary layer under the influence of an external adverse pressure gradient. A fraction timestep method was used, and three different Reynolds numbers were studied. Calculations for several suction strengths showed that above a critical suction strength of 0.12 (all Reynolds numbers) shedding of discrete vortices was evident. Examination of the unsteady separation structure showed that the frequency of shedding was influenced by the Reynolds number but not by the strength of the pressure gradient. The vortex shedding appears dominated by an inviscid instability. Study of the time averaged separation bubbles indicates that the bubbles have a structure similar to laminar separation bubbles produced in experiment. (C.J.U.)

AB - Studies the separation of a two-dimensional laminar boundary layer under the influence of an external adverse pressure gradient. A fraction timestep method was used, and three different Reynolds numbers were studied. Calculations for several suction strengths showed that above a critical suction strength of 0.12 (all Reynolds numbers) shedding of discrete vortices was evident. Examination of the unsteady separation structure showed that the frequency of shedding was influenced by the Reynolds number but not by the strength of the pressure gradient. The vortex shedding appears dominated by an inviscid instability. Study of the time averaged separation bubbles indicates that the bubbles have a structure similar to laminar separation bubbles produced in experiment. (C.J.U.)

UR - http://www.scopus.com/inward/record.url?scp=0024589157&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0024589157&partnerID=8YFLogxK

M3 - Chapter

AN - SCOPUS:0024589157

SN - 0387518843

SN - 9780387518848

SP - 82

EP - 92

BT - LOW REYNOLDS NUMBER AERODYNAMICS. PROC. CONF., NOTRE DAME, U.S.A., JUNE 5-7, 1989 }EDITED BY T.J. MUELLER]. (LECTURE NOTES IN

PB - Berlin, Germany, Springer-Verlag

ER -