Possible nature of the explosion of the Tunguska meteorite and the breakup of the Comet Shoemaker-Levy

Ivanov, A. G.; Ryzhanskii, V. A.

doi:10.1007/bf00744979

Cited by 3 publications

(7 citation statements)

References 3 publications

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“…[16 -25]). In particular, the nature of the Tunguska meteorite is the subject of intensive discussions [16,18,20,22,24]. The Tunguska impact caused vast destruction of the forest in the area of about 10 8 m 2 and was accompanied by explosion-like phenomena.…”

Section: Introductionmentioning

confidence: 99%

An adaptive moving mesh method with application to non-stationary hypersonic flows in the atmosphere

Utyuzhnikov¹,

Rudenko

2008

Proceedings of the Institution of Mechanical Engineers, Part G:

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A numerical algorithm based on a shock-capturing scheme on adaptive moving meshes is described. Three-dimensional dynamical adaptive meshes are generated as the result of solving a variational problem. The governing equations are solved in a moving coordinate system therefore the method does not require any interpolation of the solution from one mesh onto another one. The developed algorithm can efficiently be used for the simulation of non-stationary supersonic flows in the atmosphere. As an example, it is applied to the study of the Tunguska meteorite hypersonic impact. For the first time this problem is modelled from the entrance moment up to the interaction with the Earth atmosphere in a three-dimensional formulation. A reasonable correspondence with the data of the observations is obtained. The implementation of the developed numerical algorithm reduces the computational time by the factor of four.

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Section: Introductionmentioning

confidence: 99%

An adaptive moving mesh method with application to non-stationary hypersonic flows in the atmosphere

Utyuzhnikov¹,

Rudenko

2008

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…The present paper is a continuation of [7][8][9][10][11] and is concerned with developing a physicomathematical model for the breakup of a SCB and estimating the dimensions of the scattering field of the largest fragments using this model. The breakup is understood as the process of macrodisplacement of the fragments of the parental body after its fracture.…”

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confidence: 99%

“…In this connection, predicting the possible consequences of atmospheric entry of a small celestial body (SCB) is of significant interest. 2 Important aspects of this problem are the fragmentation of a SCB and the scattering of its fragments in the atmosphere and on the surface of the planet.At present, a number of computational and theoretical models for the fragmentation stage have been developed using various physical backgrounds (see, for example, [1][2][3][4][5][6][7][8][9][10][11]). A common feature of the models 1 Institute of Experimental Physics, Russian Federal Nuclear Center, Sarov 607190; root@gdd.vniief.ru.…”

mentioning

confidence: 99%

“…At present, a number of computational and theoretical models for the fragmentation stage have been developed using various physical backgrounds (see, for example, [1][2][3][4][5][6][7][8][9][10][11]). A common feature of the models 1 Institute of Experimental Physics, Russian Federal Nuclear Center, Sarov 607190; root@gdd.vniief.ru.…”

mentioning

confidence: 99%

“…Since the SCB breakup is preceded by a fragmentation stage, the problem of modeling this stage is of fundamental importance. We adopted the discrete fragmentation model of [7][8][9][10][11] as the most suitable for the following reasons.…”

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confidence: 99%

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Model for the Atmospheric Fragmentation and Scattering of a Small Celestial Body

Ivanov

Ryzhanskii

2005

Combust Explos Shock Waves

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This paper considers the interaction of a small celestial body with a planetary atmosphere, which is treated as a two-stage process: the first stage is the fragmentation of the parental body (a model for this stage was developed by the authors) and the second stage involves breakup and scattering of the fragments. A model for the second stage is proposed in which the breakup is treated as a two-phase process of macrodisplacement of the fragments resulting from the fracture of the parental body. In the first phase there is accelerated rotation of the fragments around their centers of mass with preservation of contact between them. By the moment the contact ceases, they acquire a transverse velocity and there comes the second phase -the dispersion of the fragments, which ends with their scattering on the ground. A feature of this model is that the breakup occurs by an aerodynamic mechanism. In an analysis of the first phase of breakup, a system of differential equations for the kinetostatics of the fragments is formulated. Calculations are performed using as an example the atmospheric breakup of the Sikhote Alin meteoroid and the scattering of its fragments on the ground. It is shown that along with the numerical method for solving the system, an approximate analytical method is also possible. Calculation results for both methods are close and are in good agreement with observations of the indicated phenomenon.The space safety of the Earth is one of the most important and vital problems of the present time. In this connection, predicting the possible consequences of atmospheric entry of a small celestial body (SCB) is of significant interest. 2 Important aspects of this problem are the fragmentation of a SCB and the scattering of its fragments in the atmosphere and on the surface of the planet.At present, a number of computational and theoretical models for the fragmentation stage have been developed using various physical backgrounds (see, for example, [1][2][3][4][5][6][7][8][9][10][11]). A common feature of the models 1 Institute of Experimental Physics, Russian Federal Nuclear Center, Sarov 607190; root@gdd.vniief.ru. 2 Recall the dangerous consequences of the fall of the Tungus (1908) and Sikhote Alin (1947) meteoroids on the Earth's surface or imagine what would have been if the ShoemakerLevy 9 comet had fallen not on the Jupiter (1994) but on the Earth! of [1 -5] is that they use the fracture criteria adopted in the mechanics of materials although here brittle fractures (SCBs are brittle) are considered inadmissible. As a result, the fragmentation is regarded as a single total breakup [2, 3] with undeterminable number and dimensions of the fragments or as a sequential avalanche breakup in which the events of gradual reduction in fragment size continuously follow one after another [1,4,5]. Previously [8-11], we proposed a different model for the sequential fragmentation of a SCB based on the energy criterion of fracture developed using the integral approach of modern fracture mechanics [12]. Therefore, the f...

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Tunguska Impact: How Far Can We Move Up in Our Prediction of the Past?

Sandaldjian

Utyuzhnikov

2012

28th International Symposium on Shock Waves

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Possible nature of the explosion of the Tunguska meteorite and the breakup of the Comet Shoemaker-Levy

Cited by 3 publications

References 3 publications

An adaptive moving mesh method with application to non-stationary hypersonic flows in the atmosphere

An adaptive moving mesh method with application to non-stationary hypersonic flows in the atmosphere

Model for the Atmospheric Fragmentation and Scattering of a Small Celestial Body

Tunguska Impact: How Far Can We Move Up in Our Prediction of the Past?

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