Application of the Unstructured Chimera Method for Rapid Weapons Trajectory Simulations

Hooker, John R.; Gudenkauf, Jared

doi:10.2514/6.2007-75

Cited by 8 publications

(4 citation statements)

References 11 publications

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“…Additionally, it also saves considerable computational resources as the CFD solutions are converged from the isolated nacelle and aircraft solutions rather than from scratch. One final benefit of the unstructured mesh chimera approach is that the orphans typically encountered in the overlapping mesh chimera process are automatically eliminated through spatial adaptation, without the need for manually regenerating meshes [20].…”

Section: Chimera Overset Methods Descriptionmentioning

confidence: 99%

Over Wing Nacelle Installations for Improved Energy Efficiency

Hooker

Wick

Zeune

et al. 2013

31st AIAA Applied Aerodynamics Conference

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Lockheed Martin (LM) has teamed with the Air Force Research Laboratory (AFRL) to evaluate over wing nacelle (OWN) configurations to better understand and exploit their potential performance characteristics for improving aircraft energy efficiency, threat avoidance, community noise abatement, and speed agility. This study represented a first-of-its kind detailed parametric study of OWN concepts using modern, high fidelity analysis and design processes to assess their feasibility for future mobility configurations. This effort assessed the impact of configuration type (i.e. low wing, high wing, and low wing/slipper mount), engine size, and engine placement and orientation on aerodynamic performance, acoustic characteristics (including the effects of wing shielding), structural weight, and aircraft stability and control characteristics. In addition, aircraft shape optimization was performed to ensure a true assessment of the performance potential of the OWN concept by minimizing adverse nacelle / wing interference effects. Results from this study indicate that OWN engine installations have the potential to improve aerodynamic efficiency as much as 5% compared to conventional under wing nacelle (UWN) engine installations at transonic cruise conditions (M > 0.80).

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Section: Chimera Overset Methods Descriptionmentioning

confidence: 99%

Over Wing Nacelle Installations for Improved Energy Efficiency

Hooker

Wick

Zeune

et al. 2013

31st AIAA Applied Aerodynamics Conference

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“…Several studies have utilised this test case, using structured [22,23,24,25], unstructured [26,27,28,29,30,31] and meshless solvers [32], to validate the prediction of the store trajectory, making it a popular validation case. The test provided pressure data for a geometrically simple wing and store under mutual interference as well as a realistic trajectory.…”

Section: Solution Monitoringmentioning

confidence: 99%

Store Release Trajectory Variability from Weapon Bays Using Scale-Adaptive Simulations

Loupy

Barakos

Taylor³

2018

AIAA Journal

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“…An overset mesh can simulate complex relative motions between multiple objects, and it is widely used in CFD simulations of ships and airplanes [21,22]. The mesh constructed for this simulation included two regions: the overset region and the numerical water tank region.…”

Section: Meshingmentioning

confidence: 99%

Effect of Waves on the Behavior of Emergent Buoyantly Rising Submarines Using CFD

Chen

Zhang

et al. 2020

Applied Sciences

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Emergent buoyantly rising submarines encounter excess roll problems, partially owing to waves that significantly affect their behavior. This study predicts the behavior of a submarine, including when it rises in static water, beam sea, head wave, following wave, 30∘ bow wave, 60∘ bow wave, 30∘ quartering wave, and 60∘ quartering wave, using the computational fluid dynamics method. The beam sea has a slight effect on pitch prior to the submarine rising to the water surface, but the maximum roll angle in the beam sea is 4.43 times that in static water. After a submarine submerges in water, the pitching oscillation does not decay quickly owing to the yaw angle. The head wave and the following wave have a continuous significant effect on the pitch; the submarine sail remains under the water surface after it submerges from the highest position. The head wave and the following wave have a slight effect on the roll and yaw before the submarine rises to the water surface; however, the roll angle suddenly increases after the submarine submerges from the highest position. As the initial angle between the submarine centerline and wave direction increases, the effect of waves on the longitudinal motion decreases. The amplitude of the pitching oscillation decreases with an increase in the initial angle between the submarine centerline and wave direction, and the waterline when the submarine oscillates on the water surface decreases. The difference in the maximum roll angle between when a submarine rises in an oblique wave and when it rises in beam sea is below 6.3∘. Submarines should try to avoid rising in a head wave and the following wave.

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Application of the Unstructured Chimera Method for Rapid Weapons Trajectory Simulations

Cited by 8 publications

References 11 publications

Over Wing Nacelle Installations for Improved Energy Efficiency

Over Wing Nacelle Installations for Improved Energy Efficiency

Store Release Trajectory Variability from Weapon Bays Using Scale-Adaptive Simulations

Effect of Waves on the Behavior of Emergent Buoyantly Rising Submarines Using CFD

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