### Abstract

To model porous walls used in transonic wind tunnels, flow through a hole is investigated using Computational Fluid Dynamics (CFD). First, we analyze the relation between flow rate and differential pressure across the hole. At low differential pressures, such as for wind tunnel porous walls, the flow rate is found to increase linearly with differential pressure. We therefore propose a new model based on a linear relationship between flow rate and differential pressure. The effects of hole shape and boundary layer conditions near the hole are then investigated. In the outflow case (i.e., wind tunnel to plenum chamber), the flow rate increases as the ratio of hole depth to diameter becomes large due to variation of the flow separation area at the hole exit. Boundary layer thickness also affects the flow field: when the ratio of boundary layer thickness to hole diameter becomes small, the flow rate decreases, because the flow along wind tunnel side wall interacts more strongly with the flow through the hole.

Original language | English |
---|---|

Pages (from-to) | 221-228 |

Number of pages | 8 |

Journal | Transactions of the Japan Society for Aeronautical and Space Sciences |

Volume | 54 |

Issue number | 185-186 |

Publication status | Published - 2011 |

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### Keywords

- CFD
- Porous Wall
- Wind Tunnel

### ASJC Scopus subject areas

- Aerospace Engineering
- Space and Planetary Science

### Cite this

*Transactions of the Japan Society for Aeronautical and Space Sciences*,

*54*(185-186), 221-228.

**Numerical analysis of flow through a hole for modeling of wind tunnel porous wall.** / Nambu, Taisuke; Hashimoto, Atsushi; Aoyama, Takashi; Satou, Tetsuya.

Research output: Contribution to journal › Article

*Transactions of the Japan Society for Aeronautical and Space Sciences*, vol. 54, no. 185-186, pp. 221-228.

}

TY - JOUR

T1 - Numerical analysis of flow through a hole for modeling of wind tunnel porous wall

AU - Nambu, Taisuke

AU - Hashimoto, Atsushi

AU - Aoyama, Takashi

AU - Satou, Tetsuya

PY - 2011

Y1 - 2011

N2 - To model porous walls used in transonic wind tunnels, flow through a hole is investigated using Computational Fluid Dynamics (CFD). First, we analyze the relation between flow rate and differential pressure across the hole. At low differential pressures, such as for wind tunnel porous walls, the flow rate is found to increase linearly with differential pressure. We therefore propose a new model based on a linear relationship between flow rate and differential pressure. The effects of hole shape and boundary layer conditions near the hole are then investigated. In the outflow case (i.e., wind tunnel to plenum chamber), the flow rate increases as the ratio of hole depth to diameter becomes large due to variation of the flow separation area at the hole exit. Boundary layer thickness also affects the flow field: when the ratio of boundary layer thickness to hole diameter becomes small, the flow rate decreases, because the flow along wind tunnel side wall interacts more strongly with the flow through the hole.

AB - To model porous walls used in transonic wind tunnels, flow through a hole is investigated using Computational Fluid Dynamics (CFD). First, we analyze the relation between flow rate and differential pressure across the hole. At low differential pressures, such as for wind tunnel porous walls, the flow rate is found to increase linearly with differential pressure. We therefore propose a new model based on a linear relationship between flow rate and differential pressure. The effects of hole shape and boundary layer conditions near the hole are then investigated. In the outflow case (i.e., wind tunnel to plenum chamber), the flow rate increases as the ratio of hole depth to diameter becomes large due to variation of the flow separation area at the hole exit. Boundary layer thickness also affects the flow field: when the ratio of boundary layer thickness to hole diameter becomes small, the flow rate decreases, because the flow along wind tunnel side wall interacts more strongly with the flow through the hole.

KW - CFD

KW - Porous Wall

KW - Wind Tunnel

UR - http://www.scopus.com/inward/record.url?scp=84863070253&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84863070253&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:84863070253

VL - 54

SP - 221

EP - 228

JO - Transactions of the Japan Society for Aeronautical and Space Sciences

JF - Transactions of the Japan Society for Aeronautical and Space Sciences

SN - 0549-3811

IS - 185-186

ER -