Coupled Numerical Analysis of Three-Dimensional Unsteady Flow with Pitching Motion of Reentry Capsule—Investigation of the Third Harmonics of the Aerodynamic Force—

TAKEDA, Yuki; Ueno, Kazuyuki; Matsuyama, Shingo; Tanno, Hideyuki

doi:10.2322/tjsass.63.249

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…Abe et al (2000) and Kazemba et al (2015) extended the Hiraki model to account for the phase delay, thereby allowing for an assessment of how the phase delay influenced the parameters of the model. Additionally, coupled analyses (Takeda et al, 2020;Yang et al, 2016;Stern et al, 2012) with fluid and motion were used to simulate wind tunnel test results and improve understanding of dynamic instability. Takeda et al evaluated the damping coefficient including the growth phase and LCO.…”

Section: Introductionmentioning

confidence: 99%

Dynamic instability modeling on phase plane for thin aeroshell capsule with pitching motion at transonic speed

TAKASAWA,

FUJII,

HIRATA

et al. 2024

Mechanical Engineering Journal

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For sample return missions from deep space, a thin aeroshell capsule was proposed aimed at mitigating the aerodynamic heating during its reentry into the earth's atmosphere. The functional requirements of the capsule mandate that it aerodynamically decelerate sufficiently and land in the appropriate attitude without a parachute. To evaluate its motion attitude during transonic conditions in a wind tunnel, we employed the 1-degree of freedom (1-DOF) oscillation method. Furthermore, to predict its motion during an actual flight based on the wind tunnel test results, we examined the impact of the moment of inertia (MOI) on the motion. In all the MOI cases investigated, the limit cycle oscillation (LCO) was observed with a constant amplitude of angle. The variations in the MOI resulted in differences in the amplitude of the angle and time to reach the LCO. This study focused on the growth phase until the LCO and evaluated the characteristics on the phase plane. Consequently, a gradual approach to acceleration attributed to the static moment was observed in the growth history. A new modeling approach, centered on the nullcline during the growth phase, was adopted. Here, an approximation using a third-order function of angular velocity was applied to reproduce the nullcline obtained from the experiment. Upon non-dimensionalization of this model equation using the motion period, it was confirmed that the non-dimensional parameters were affected by the motion period, while this model focused solely on the growth phase. Furthermore, upon parameter tuning to replicate the amplitude of the angle and time to reach the LCO, and using these parameters, we predicted the impact of the MOI. The predicted results qualitatively reproduced larger MOI leading to larger amplitudes of angle and longer times to reach the LCO, which was consistent with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Dynamic instability modeling on phase plane for thin aeroshell capsule with pitching motion at transonic speed

TAKASAWA,

FUJII,

HIRATA

et al. 2024

Mechanical Engineering Journal

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Dynamic instability in lift-type reentry capsule at supersonic flow

Okano,

Sato,

Nagai

et al. 2024

Physics of Fluids

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Numerical simulations were conducted to investigate dynamic instability of a Japanese lift-type reentry capsule, which is named H-II transfer vehicle Recovery Vehicle (HRV), at Mach 1.2 by comparing two capsule shapes of an original HRV model and a model with a different shoulder angle of 10°. The 10° model has a thicker aft-body with a smaller shoulder angle than the original model. A previous pitch-direction One-Degree Of Freedom (1DOF) experiment revealed that the original model was dynamically stable, whereas the 10° model was dynamically unstable at Mach 1.2. So as to reproduce the same trends as the experiment, a high-order numerical scheme and zonal detached eddy simulation were employed. In fixed angle simulations, we found that the static longitudinal stability of the 10° model is higher than that of the original model in contrast with the observed dynamic stability. 1DOF free oscillation simulations successfully reproduced the same trends as the experiment. We elucidated that the main factor of the dynamic instability of the HRV-type capsule is a hysteresis of a boundary layer separation on the upper side of the capsule. The hysteresis is induced by a variation of momentum in a boundary layer due to capsule motion. We also found that for HRV-type capsules, the lower the static stability within the statically stable range, the higher the dynamic stability might be. In addition, on the lower side, a sign of the work exerted by surrounding flow is different between the original model and the 10° model. A dynamic mode decomposition analysis indicated that the vortex structures on the capsule wake might induce this difference.

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Wall heat flux estimation using the Cartesian cut-cell method

TAKEDA,

BABA,

UENO

2023

JFST

Self Cite

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The Cartesian cut-cell method evaluates wall-fluid interactions by using the fluxes through a wall. This wall treatment by the Cartesian cut-cell method is expected to overcome the mass and energy conservation problems of the immersed boundary method. A wall flux evaluation using the image point is proposed in this study to avoid volume center estimation. The Cartesian cut-cell method that uses the proposed wall flux evaluation is validated by the numerical simulations of supersonic flows past simple shapes. In the numerical simulations of the supersonic flow past a cylinder with an isothermal wall, the shorter displacement d IP of the image point from the wall provided a better estimation of the wall heat flux. Furthermore, the wall heat flux distributions and the amount of heat converged with grid refinement. In the numerical simulations of the supersonic flow past a wedge, the minimum grid resolution of the Cartesian cut-cell method for wall flux estimation was suggested. Furthermore, the results of the isothermal wall condition, the adiabatic wall condition, and the inviscid condition were compared.

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Coupled Numerical Analysis of Three-Dimensional Unsteady Flow with Pitching Motion of Reentry Capsule—Investigation of the Third Harmonics of the Aerodynamic Force—

Cited by 4 publications

References 13 publications

Dynamic instability modeling on phase plane for thin aeroshell capsule with pitching motion at transonic speed

Dynamic instability modeling on phase plane for thin aeroshell capsule with pitching motion at transonic speed

Dynamic instability in lift-type reentry capsule at supersonic flow

Wall heat flux estimation using the Cartesian cut-cell method

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