Simulating the Flows About Cargo Containers Used During Parachute Airdrop Operations

McQuilling, Mark; Potvin, J; Riley, Justin

doi:10.2514/6.2010-4565

Cited by 7 publications

(9 citation statements)

References 9 publications

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“…A validation experiment should strive to emphasize inherent synergism between computational and experimental approaches. 4. Although the experimental design should be developed cooperatively, independence must be maintained in obtaining both the computational and experimental results.…”

Section: Introductionmentioning

confidence: 99%

“…[2] With recent advances in computational technology, computational fluid dynamics (CFD) simulations of the flow field around parachutes have become possible. [3,4] Currently, various modeling assumptions have to be made to successfully compute the full fluid-structure interaction problem. As pointed out by Potvin et al in their white paper on aerodynamic decelerator systems design and analysis, numerous challenges still have to be overcome to reliably simulate parachute aerodynamics.…”

Section: Introductionmentioning

confidence: 99%

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Deformation Tracking of a Flexible Fence

Womack

Seidel

2014

55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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The unsteady deflection of a flexible fence, made from 0.051mm thick low carbon steel shimstock, due to wind loads has been investigated experimentally. The motion of this fence in the flowfield created in a wind tunnel was tracked with two high speed cameras using a grid of 23 × 13 targets on the fence. Tests were conducted at speeds of 4, 5, 6, and 7m/s. The spatial resolution of the cameras was 800 × 600 pixels and a frame rate of 300fps was used to allow for the reproduction of the fence motion. The mean fence deformation and the oscillation amplitude increased with increasing velocity. At 4m/s, no oscillations were observed. For velocities of 5m/s and higher, the oscillation frequency was 12Hz, irrespective of velocity. Proper Orthogonal Decomposition was used to analyze the mode shapes of the oscillating fence. The mean bending mode, unsteady bending mode, and higher order modes were identified and their spectra were determined.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deformation Tracking of a Flexible Fence

Womack

Seidel

2014

55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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“…Dedicated experimental studies on the motion 10 and aerodynamics 11 of airdrop platforms indicate that the forces on the platform are governed by 3D transient flow phenomena. The same holds for a numerical simulation of the flow around a typical cargo container 12 , or a parachute model 13 . The aerodynamics of parachutes has been studied as well and it is noted that for the deployment phase the aircraft wake may have a significant influence on the parachute behavior 1 .…”

Section: Introductionmentioning

confidence: 83%

Experimental investigation of the flow field topology for several cargo drop configurations

Roosenboom

Schröder

Geisler

et al. 2012

28th Aerodynamic Measurement Technology, Ground Testing, and Flight Testing Conference

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Various cargo drop configurations have been analyzed using stereoscopic Particle Image Velocimetry (SPIV). The PIV measurement planes were located at several positions in the wake of a generic transport aircraft model with an open ramp. The stream-and spanwise positioning of the wind tunnel model was facilitated by means of positioning mechanism of the wind tunnel facility. The first measured configuration consisted of only the wake of the transport aircraft. The cargo configurations consisted of a model of a cargo container, including a rigid parachute and a cargo with an airdrop support platform. A fixed haltering mechanism was used to keep the cargo at a fixed position behind the wind tunnel model for the PIV measurements. The resulting velocity fields (obtained at several chord wise positions) are used to discuss the flow topologies for these airdrop configurations. Nomenclature L, H, B = length, height and width of cargo model Re C = Reynolds number based chord length of wind tunnel model Re H = Reynolds number based on height of cargo model U ∞ = free stream velocity |V| = magnitude of velocity x, y, z = Cartesian axis system u, v, w = velocity component in x, y and z-direction, respectively α = angle of attack

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“…Whether the presented models are also useful for real airdrop configurations or not, further investigations or validations will tell. At this point it is recommended to also consider the implementation of the payload cargo models given in the recent literature by Desabrais, Potvin and others [15][16][17][18] .…”

Section: Discussionmentioning

confidence: 98%

“…Today, the estimation of aerodynamic coefficients is done more and more numerically. In the last years, Desabrais, Potvin, McQuilling and others took a closer look on the aerodynamics of airdrop platforms [14][15][16][17][18] . In addition to a 'high-aspect-ratio' cargo based on a Type-V platform, they also considered a more stubbed 'low-aspect-ratio' payload container and studied the influence of the cargo aerodynamics on the airdrop trajectory 17 .…”

Section: Introductionmentioning

confidence: 99%

Approximated Steady Aerodynamic Characteristics for two Cuboids and a Hemispherical Shell used in Airdrop Simulation

Jann

Geisbauer

2013

AIAA Aerodynamic Decelerator Systems (ADS) Conference

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The paper presents the approach and the results from the CFD analysis and the further evaluation of the aerodynamics characteristics of three different bluff body shapes used in an airdrop and parachute simulation. In a joint effort between the Institute of Aerodynamics and Flow Technology and the Institute of Flight Systems within the internal DLR-project MiTraPor II, aerodynamic coefficients for two cuboids and a hemispherical shell representing scaled models of payloads and parachute were evaluated. The evaluation of the aerodynamic coefficients is based on a CFD analysis of a first cuboid with an aspect ratio of 11 x 9 x 5, a second cuboid (or semi-cube) with 11 x 9 x 9 and a hemispherical shell. The analysis covers the full 360° angle of attack range with a sideslip angle of zero, and additional points at β ≠ 0. For being used within the airdrop and parachute simulation, the CFD results were post-processed to obtain analytical approximations for the steady aerodynamic coefficients.

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Simulating the Flows About Cargo Containers Used During Parachute Airdrop Operations

Cited by 7 publications

References 9 publications

Deformation Tracking of a Flexible Fence

Deformation Tracking of a Flexible Fence

Experimental investigation of the flow field topology for several cargo drop configurations

Approximated Steady Aerodynamic Characteristics for two Cuboids and a Hemispherical Shell used in Airdrop Simulation

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