Aircraft ditching: a free surface / free motion problem

Streckwall, Heinrich; Lindenau, O.; Bensch, L.

doi:10.1016/s1644-9665(12)60025-9

Cited by 28 publications

(19 citation statements)

References 3 publications

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“…A review of the activity done in the field is given by Seddon and Moatamedi (2006) whereas some more recent activities, e.g. Climent et al (2006), Streckwall et al (2007), Guo et al (2013), Zhang et al (2012) testify the relevance of the topic.…”

Section: Introductionmentioning

confidence: 99%

High-speed ditching of a flat plate: Experimental data and uncertainty assessment

Iafrati

Grizzi

Siemann

et al. 2015

Journal of Fluids and Structures

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Section: Introductionmentioning

confidence: 99%

High-speed ditching of a flat plate: Experimental data and uncertainty assessment

Iafrati

Grizzi

Siemann

et al. 2015

Journal of Fluids and Structures

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“…11. Ho and the res a pure fus estimation During found in th deceleratio 1953 when initial timi between th ater surface de (top) and GMM fferences in wa n are caused m owever, one sh sults of both C selage, while method [12]. g the prelimina he numerical r on seen in the n measurement ing points betw he experiment a …”

Section: A Explicimentioning

confidence: 92%

“…Section IV simulates the ditching process of the aircraft model from Ref. [3] and compares the results with the experimental data and other numerical results [12]. The effects of various aerodynamic parts of the aircraft on ditching behavior are analyzed in detail.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Ditching Characteristics of a Transport Aircraft by Global Moving Mesh

Guo

et al. 2015

53rd AIAA Aerospace Sciences Meeting

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This paper numerically investigates the ditching characteristics of the NACA TN 2929 model. In the simulation method, the RANS equation and realizable k-ε turbulence model are solved by the finite volume method; the volume-of-fluid method is used to capture the water-air interface; the six degree of freedom model and the global moving mesh (GMM) method are used to deal with the relative motion between the water and the object. GMM is a new dynamic mesh method which is proposed to simulate water entry problems. In GMM, the whole computational domain and boundaries move together with the object to avoid the high computational expense and low quality mesh in the traditional mesh deformation method. This numerical method is applied to simulate the water impact of a 2D cylinder in free fall, and the results show a good agreement with the experimental data. The effect of each aerodynamic part of the NACA TN 2929 model on the ditching behavior is studied in detail, and the results show that aerodynamic loads cannot be ignored when analyzing the ditching motion of the aircraft. Nomenclature a = volume fraction in a cell p C = pressure coefficient f  = force K = inertial tensor L = over-all length of the fuselage m = mass of object m  = mass transfer between different fluids M  = moment vector N = number of the phases in a multiphase flow p = pressure S = source term v  = velocity vector 0 V = impact velocity z = vertical distance of the center of gravity above calm water level ρ = density

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“…An important concern in the problem of aircraft ditching is the suction force at the rear of the fuselage. The computed pressure distribution by Streckwall et al [5] 'shows a pronounced region of high pressure in the front area of the submerged part and negative pressures with respect to the ambient pressure in the convex curved part at the rear'. During landing on water with a horizontal speed, the wetted area of the body surface initially expands in both directions.…”

Section: Introductionmentioning

confidence: 94%

Oblique impact of a smooth body on a thin layer of inviscid liquid

Хабахпашева

Korobkin

2013

Proc. R. Soc. A.

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The two-dimensional motion of a rigid body with a smooth surface is studied during its oblique impact on a liquid layer. The problem is coupled: the three degrees of freedom of the moving body are determined together with the liquid flow and the hydrodynamic pressure along the wetted part of the body surface. The impact process is divided into two temporal stages. During the first stage, the wetted region expands at a high speed with jetting flows at both ends of the wetted region. In the second stage, the free surface of the liquid is allowed to separate from the body surface. The position of the separation point is determined with the help of the Brillouin-Villat condition. Calculations are performed for elliptic cylinders of different masses and with different orientations and speeds before the impact. The horizontal and vertical displacements of the body, as well as its angle of rotation and corresponding speeds are investigated. The model developed remains valid until the body either touches the bottom of the liquid or rebounds from the liquid.

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Aircraft ditching: a free surface / free motion problem

Cited by 28 publications

References 3 publications

High-speed ditching of a flat plate: Experimental data and uncertainty assessment

High-speed ditching of a flat plate: Experimental data and uncertainty assessment

Numerical Study of Ditching Characteristics of a Transport Aircraft by Global Moving Mesh

Oblique impact of a smooth body on a thin layer of inviscid liquid

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