角柱列を過ぎる流れの合流現象と乱流への遷移

Translated title of the contribution: Vortices shed from a row of square bars

Takeshi Akinaga, Takao Kadoishi, Jiro Mizushima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Interactions between the wakes in a flow past a row of square bars are investigated by numerical simulations, the linear stability analysis and the bifurcation analysis. It is assumed that the row of square bars is placed across a uniform flow. Two-dimensional and incompressible flow field is also assumed. The flow is steady and symmetric along a streamwise centerline through the center of each square bar at low Reynolds numbers. However, it becomes unsteady and periodic in time at the Reynolds numbers larger than a critical value, and then the wakes behind the square bars become oscillatory. It is found by numerical simulations that vortices are shed synchronously from every couple of adjacent square bars in the same phase or in the anti-phase depending upon the distance between the bars. The synchronous shedding of vortices is clarified to occur due to an instability of the steady symmetric flow by the linear stability analysis. The bifurcation diagram of the flow is obtained and the critical Reynolds number of the instability is evaluated numerically.
Original languageOther
Title of host publication境界層遷移の解明と制御研究会講演論文集
EditorsTakeshi Akinaga, Takao Kadoishi, Jiro Mizushima
Pages19-22
Number of pages4
Publication statusPublished - Dec 2002

Publication series

Name航空宇宙技術研究所特別資料
NumberNAL-SP-56
ISSN (Print)1347-457X

Fingerprint

vortices
steady flow
wakes
Reynolds number
uniform flow
two dimensional flow
incompressible flow
low Reynolds number
flow distribution
simulation
diagrams
interactions

Cite this

Akinaga, T., Kadoishi, T., & Mizushima, J. (2002). 角柱列を過ぎる流れの合流現象と乱流への遷移. In T. Akinaga, T. Kadoishi, & J. Mizushima (Eds.), 境界層遷移の解明と制御研究会講演論文集 (pp. 19-22). (航空宇宙技術研究所特別資料; No. NAL-SP-56).
Akinaga, Takeshi ; Kadoishi, Takao ; Mizushima, Jiro. / 角柱列を過ぎる流れの合流現象と乱流への遷移. 境界層遷移の解明と制御研究会講演論文集. editor / Takeshi Akinaga ; Takao Kadoishi ; Jiro Mizushima. 2002. pp. 19-22 (航空宇宙技術研究所特別資料; NAL-SP-56).
@inproceedings{16286739cb0a4b8d80428b90c5b71b90,
title = "角柱列を過ぎる流れの合流現象と乱流への遷移",
abstract = "Interactions between the wakes in a flow past a row of square bars are investigated by numerical simulations, the linear stability analysis and the bifurcation analysis. It is assumed that the row of square bars is placed across a uniform flow. Two-dimensional and incompressible flow field is also assumed. The flow is steady and symmetric along a streamwise centerline through the center of each square bar at low Reynolds numbers. However, it becomes unsteady and periodic in time at the Reynolds numbers larger than a critical value, and then the wakes behind the square bars become oscillatory. It is found by numerical simulations that vortices are shed synchronously from every couple of adjacent square bars in the same phase or in the anti-phase depending upon the distance between the bars. The synchronous shedding of vortices is clarified to occur due to an instability of the steady symmetric flow by the linear stability analysis. The bifurcation diagram of the flow is obtained and the critical Reynolds number of the instability is evaluated numerically.",
author = "Takeshi Akinaga and Takao Kadoishi and Jiro Mizushima",
year = "2002",
month = "12",
language = "Other",
series = "航空宇宙技術研究所特別資料",
number = "NAL-SP-56",
pages = "19--22",
editor = "Takeshi Akinaga and Takao Kadoishi and Jiro Mizushima",
booktitle = "境界層遷移の解明と制御研究会講演論文集",

}

Akinaga, T, Kadoishi, T & Mizushima, J 2002, 角柱列を過ぎる流れの合流現象と乱流への遷移. in T Akinaga, T Kadoishi & J Mizushima (eds), 境界層遷移の解明と制御研究会講演論文集. 航空宇宙技術研究所特別資料, no. NAL-SP-56, pp. 19-22.

角柱列を過ぎる流れの合流現象と乱流への遷移. / Akinaga, Takeshi; Kadoishi, Takao; Mizushima, Jiro.

境界層遷移の解明と制御研究会講演論文集. ed. / Takeshi Akinaga; Takao Kadoishi; Jiro Mizushima. 2002. p. 19-22 (航空宇宙技術研究所特別資料; No. NAL-SP-56).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - 角柱列を過ぎる流れの合流現象と乱流への遷移

AU - Akinaga, Takeshi

AU - Kadoishi, Takao

AU - Mizushima, Jiro

PY - 2002/12

Y1 - 2002/12

N2 - Interactions between the wakes in a flow past a row of square bars are investigated by numerical simulations, the linear stability analysis and the bifurcation analysis. It is assumed that the row of square bars is placed across a uniform flow. Two-dimensional and incompressible flow field is also assumed. The flow is steady and symmetric along a streamwise centerline through the center of each square bar at low Reynolds numbers. However, it becomes unsteady and periodic in time at the Reynolds numbers larger than a critical value, and then the wakes behind the square bars become oscillatory. It is found by numerical simulations that vortices are shed synchronously from every couple of adjacent square bars in the same phase or in the anti-phase depending upon the distance between the bars. The synchronous shedding of vortices is clarified to occur due to an instability of the steady symmetric flow by the linear stability analysis. The bifurcation diagram of the flow is obtained and the critical Reynolds number of the instability is evaluated numerically.

AB - Interactions between the wakes in a flow past a row of square bars are investigated by numerical simulations, the linear stability analysis and the bifurcation analysis. It is assumed that the row of square bars is placed across a uniform flow. Two-dimensional and incompressible flow field is also assumed. The flow is steady and symmetric along a streamwise centerline through the center of each square bar at low Reynolds numbers. However, it becomes unsteady and periodic in time at the Reynolds numbers larger than a critical value, and then the wakes behind the square bars become oscillatory. It is found by numerical simulations that vortices are shed synchronously from every couple of adjacent square bars in the same phase or in the anti-phase depending upon the distance between the bars. The synchronous shedding of vortices is clarified to occur due to an instability of the steady symmetric flow by the linear stability analysis. The bifurcation diagram of the flow is obtained and the critical Reynolds number of the instability is evaluated numerically.

M3 - Conference contribution

T3 - 航空宇宙技術研究所特別資料

SP - 19

EP - 22

BT - 境界層遷移の解明と制御研究会講演論文集

A2 - Akinaga, Takeshi

A2 - Kadoishi, Takao

A2 - Mizushima, Jiro

ER -

Akinaga T, Kadoishi T, Mizushima J. 角柱列を過ぎる流れの合流現象と乱流への遷移. In Akinaga T, Kadoishi T, Mizushima J, editors, 境界層遷移の解明と制御研究会講演論文集. 2002. p. 19-22. (航空宇宙技術研究所特別資料; NAL-SP-56).