The instability of two-dimensional laminar separation.

L. L. Pauley, P. Moin, W. C. Reynolds

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

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 languageEnglish (US)
Title of host publicationLOW REYNOLDS NUMBER AERODYNAMICS. PROC. CONF., NOTRE DAME, U.S.A., JUNE 5-7, 1989 }EDITED BY T.J. MUELLER]. (LECTURE NOTES IN
PublisherBerlin, Germany, Springer-Verlag
Pages82-92
Number of pages11
Edition54 ), Berlin, Germany, Springer-Verlag, 1989
ISBN (Print)0387518843, 9780387518848
StatePublished - Jan 1 1989

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Reynolds number
Pressure gradient
Laminar boundary layer
Vortex shedding
Vortex flow
Experiments

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Pauley, L. L., Moin, P., & Reynolds, W. C. (1989). The instability of two-dimensional laminar separation. In 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.
Pauley, L. L. ; Moin, P. ; Reynolds, W. C. / The instability of two-dimensional laminar separation. 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. Berlin, Germany, Springer-Verlag, 1989. pp. 82-92
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Pauley, LL, Moin, P & Reynolds, WC 1989, The instability of two-dimensional laminar separation. in 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.

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. Berlin, Germany, Springer-Verlag, 1989. p. 82-92.

Research output: Chapter in Book/Report/Conference proceedingChapter

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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.)

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Pauley LL, Moin P, Reynolds WC. The instability of two-dimensional laminar separation. In 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. Berlin, Germany, Springer-Verlag. 1989. p. 82-92