### Abstract

The flow field in the near wake of an impulsively started rigid impermeable parachute canopy was studied computationally by a finite element scheme. The separated shear layer surrounding the canopy created a starting vortex ring. As time evolved, flow instabilities caused the vortex ring to become convoluted and eventually led to the breakup of the ring. This phase of the flow took a time of about 16D/U, where D is the effective projected diameter of the canopy and U is the freestream velocity. After the initial phase, the flow went through a transition phase where the drag reached a local peak prior to settling into its steady state. In the steady state phase, the drag and base pressure coefficient of the canopy were nearly constant. The computed drag coefficient matched very well against experimental data. The time to reach the steady state was 45D/U. During the steady state phase, a complex vortex shedding pattern was observed in the near wake despite the nearly constant drag coefficient.

Original language | English |
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Title of host publication | Fluids 2000 Conference and Exhibit |

Publication status | Published - 2000 |

Externally published | Yes |

Event | Fluids 2000 Conference and Exhibit - Denver, CO, United States Duration: 2000 Jun 19 → 2000 Jun 22 |

### Other

Other | Fluids 2000 Conference and Exhibit |
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Country | United States |

City | Denver, CO |

Period | 00/6/19 → 00/6/22 |

### Fingerprint

### ASJC Scopus subject areas

- Fluid Flow and Transfer Processes
- Energy Engineering and Power Technology
- Aerospace Engineering
- Mechanical Engineering

### Cite this

*Fluids 2000 Conference and Exhibit*

**Temporal evolution of the near wake of an impulsively started parachute canopy.** / Johari, H.; Stein, K.; Tezduyar, Tayfun E.

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

*Fluids 2000 Conference and Exhibit.*Fluids 2000 Conference and Exhibit, Denver, CO, United States, 00/6/19.

}

TY - GEN

T1 - Temporal evolution of the near wake of an impulsively started parachute canopy

AU - Johari, H.

AU - Stein, K.

AU - Tezduyar, Tayfun E.

PY - 2000

Y1 - 2000

N2 - The flow field in the near wake of an impulsively started rigid impermeable parachute canopy was studied computationally by a finite element scheme. The separated shear layer surrounding the canopy created a starting vortex ring. As time evolved, flow instabilities caused the vortex ring to become convoluted and eventually led to the breakup of the ring. This phase of the flow took a time of about 16D/U, where D is the effective projected diameter of the canopy and U is the freestream velocity. After the initial phase, the flow went through a transition phase where the drag reached a local peak prior to settling into its steady state. In the steady state phase, the drag and base pressure coefficient of the canopy were nearly constant. The computed drag coefficient matched very well against experimental data. The time to reach the steady state was 45D/U. During the steady state phase, a complex vortex shedding pattern was observed in the near wake despite the nearly constant drag coefficient.

AB - The flow field in the near wake of an impulsively started rigid impermeable parachute canopy was studied computationally by a finite element scheme. The separated shear layer surrounding the canopy created a starting vortex ring. As time evolved, flow instabilities caused the vortex ring to become convoluted and eventually led to the breakup of the ring. This phase of the flow took a time of about 16D/U, where D is the effective projected diameter of the canopy and U is the freestream velocity. After the initial phase, the flow went through a transition phase where the drag reached a local peak prior to settling into its steady state. In the steady state phase, the drag and base pressure coefficient of the canopy were nearly constant. The computed drag coefficient matched very well against experimental data. The time to reach the steady state was 45D/U. During the steady state phase, a complex vortex shedding pattern was observed in the near wake despite the nearly constant drag coefficient.

UR - http://www.scopus.com/inward/record.url?scp=84894549331&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84894549331&partnerID=8YFLogxK

M3 - Conference contribution

BT - Fluids 2000 Conference and Exhibit

ER -