Abstract
Computational analyses are used to provide a more complete understanding of the mechanisms that contribute to the development of oscillating planar jets. The geometry considered is a two-dimensional jet exhausting into a blind channel, whose open end is opposite to the initial direction such that the jet must turn through 180 deg to exit. The resulting flowfields exhibit three distinct characters that depend on the channel expansion ratio and the Reynolds number. At low Reynolds numbers the flow is steady and symmetric. A symmetry-breaking bifurcation at intermediate Reynolds numbers produces steady asymmetric flows. A Hopf bifurcation at higher Reynolds numbers yields unsteady flows. Predicted critical Reynolds numbers and oscillation frequencies are presented for different expansion ratios. Solutions are obtained from the time-dependent Navier-Stokes equations by means of an incompressible formulation based on dual-time stepping via artificial compressibility.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1425-1431 |
| Number of pages | 7 |
| Journal | AIAA Journal |
| Volume | 36 |
| Issue number | 8 |
| DOIs | |
| State | Published - Jan 1 1998 |
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All Science Journal Classification (ASJC) codes
- Aerospace Engineering
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Simulations of planar flapping jets in confined channels. / Battaglia, Francine; Kulkarni, Anil Kamalakant; Feng, Jinzhang; Merkle, Charles L.
In: AIAA Journal, Vol. 36, No. 8, 01.01.1998, p. 1425-1431.Research output: Contribution to journal › Article
TY - JOUR
T1 - Simulations of planar flapping jets in confined channels
AU - Battaglia, Francine
AU - Kulkarni, Anil Kamalakant
AU - Feng, Jinzhang
AU - Merkle, Charles L.
PY - 1998/1/1
Y1 - 1998/1/1
N2 - Computational analyses are used to provide a more complete understanding of the mechanisms that contribute to the development of oscillating planar jets. The geometry considered is a two-dimensional jet exhausting into a blind channel, whose open end is opposite to the initial direction such that the jet must turn through 180 deg to exit. The resulting flowfields exhibit three distinct characters that depend on the channel expansion ratio and the Reynolds number. At low Reynolds numbers the flow is steady and symmetric. A symmetry-breaking bifurcation at intermediate Reynolds numbers produces steady asymmetric flows. A Hopf bifurcation at higher Reynolds numbers yields unsteady flows. Predicted critical Reynolds numbers and oscillation frequencies are presented for different expansion ratios. Solutions are obtained from the time-dependent Navier-Stokes equations by means of an incompressible formulation based on dual-time stepping via artificial compressibility.
AB - Computational analyses are used to provide a more complete understanding of the mechanisms that contribute to the development of oscillating planar jets. The geometry considered is a two-dimensional jet exhausting into a blind channel, whose open end is opposite to the initial direction such that the jet must turn through 180 deg to exit. The resulting flowfields exhibit three distinct characters that depend on the channel expansion ratio and the Reynolds number. At low Reynolds numbers the flow is steady and symmetric. A symmetry-breaking bifurcation at intermediate Reynolds numbers produces steady asymmetric flows. A Hopf bifurcation at higher Reynolds numbers yields unsteady flows. Predicted critical Reynolds numbers and oscillation frequencies are presented for different expansion ratios. Solutions are obtained from the time-dependent Navier-Stokes equations by means of an incompressible formulation based on dual-time stepping via artificial compressibility.
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U2 - 10.2514/2.533
DO - 10.2514/2.533
M3 - Article
VL - 36
SP - 1425
EP - 1431
JO - AIAA Journal
JF - AIAA Journal
SN - 0001-1452
IS - 8
ER -