A new hybrid framework for simulating hypervelocity asteroid impacts and gravitational reaccumulation

Mir, Charles El; Ramesh, K.T.; Richardson, D. C.

doi:10.1016/j.icarus.2018.12.032

Cited by 9 publications

(3 citation statements)

References 67 publications

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“…The ordinary chondrite parent bodies would have experienced an impact event several times because it is not easy to induce complete disruption of an asteroid by a single impact event (El Mir et al. 2019). It is also possible that the disrupted fragments have experienced another impact event.…”

Section: Discussionmentioning

confidence: 99%

Systematic investigations of high‐pressure polymorphs in shocked ordinary chondrites

Miyahara

Yamaguchi

Saitoh

et al. 2020

Meteorit & Planetary Scien

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Shock-induced melting textures and high-pressure polymorphs in 178 ordinary chondrites of all chemical groups and petrologic types were investigated. The shock-induced melting modes were classified into three types, namely pocket, line, and network. The type of shock-induced melting depends on the petrologic type. The width of the shock-induced melt increased with increasing the petrologic type number. The approximate estimated shock-pressure ranges recorded in and around the shock-induced melts of the H-group ordinary chondrites based on the identified high-pressure polymorphs were as follows: H3, less than 2 GPa; H4-H6, 2-6 GPa. For ordinary chondrites of the L/LL group, the values were as follows: L/LL3, 2-6 GPa; L/LL4, 2-14 GPa; L5: 14-20 GPa; LL5, 2-14 GPa; L6, 17-23 GPa; and LL6, 14-18 GPa. After adopting the estimated shock pressures into the onion shell-structured parent body model, the shock pressure on the surface was much lower than in the interior. One possibility is that the apparent lower shock pressure on the surface is due to spallation during the impact. Considering the features of the high-pressure polymorphs, the major disruption history of the parent bodies is different in each chemical group, although the L/LL chondrite parent bodies may have a similar major disruption history.

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Section: Discussionmentioning

confidence: 99%

Systematic investigations of high‐pressure polymorphs in shocked ordinary chondrites

Miyahara

Yamaguchi

Saitoh

et al. 2020

Meteorit & Planetary Scien

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show abstract

“…Due to the relative ease of its implementation and its ability to simulate complex problems which are substantially more difficult in other methods, MPM has been used for a wide range of applications, from modeling granular flows 25‐28 to brittle and ductile fracture problems 21,29‐33 . Other applications have included examination of the effects of explosions and shockwaves on different materials 34‐40 and predicting the dynamic failure processes of earthen and granular slopes 41‐45 …”

Section: Introductionmentioning

confidence: 99%

“…[21][22][23][24] Due to the relative ease of its implementation and its ability to simulate complex problems which are substantially more difficult in other methods, MPM has been used for a wide range of applications, from modeling granular flows [25][26][27][28] to brittle and ductile fracture problems. 21,[29][30][31][32][33] Other applications have included examination of the effects of explosions and shockwaves on different materials [34][35][36][37][38][39][40] and predicting the dynamic failure processes of earthen and granular slopes. [41][42][43][44][45] The use of the material point method for simulating fluid flows 2,3,[46][47][48][49][50][51] is becoming increasingly common, especially in the fields of physics-based animation and free-surface simulation.…”

Section: Introductionmentioning

confidence: 99%

Analysis and mitigation of spatial integration errors for the material point method

Baumgarten

Kamrin

2023

Numerical Meth Engineering

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The material point method (MPM) is a robust numerical simulation approach for continuum mechanics problems involving large material deformations coupled to changing surface topographies. These types of problems are present in many different engineering contexts, from understanding the failure processes of earthen slopes to predicting the strengths and failure mechanisms of body armor to modeling the impact forces of waves in fluid tanks. By using a set of persistent material point tracers to follow the motion and deformation of the continuum material while solving the equations of motion on a static simulation grid, the MPM avoids several shortcomings of more traditional numerical approaches including blurring of material surfaces -as in Eulerian finite element or finite volume methods (FEMs or FVMs) -and mesh tangling -as in Lagrangian FEMs. Despite its robustness, MPM is known to develop significant numerical errors: namely, (i) the particle ringing instability and (ii) solution dependent discretization and integration errors. In this work, we present an analysis of local-in-time, spatial integration errors in the MPM and several techniques designed to mitigate these errors. Error mitigation approaches previously described in the literature are compared to a new method we propose for problems involving very large material deformations. The proposed method is shown to offer substantial improvement over standard MPM for simulations of fluid-like materials without requiring significant augmentation of existing MPM frameworks.

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Optimization and decision-making framework for multi-staged asteroid deflection campaigns under epistemic uncertainties

et al. 2020

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A new hybrid framework for simulating hypervelocity asteroid impacts and gravitational reaccumulation

Cited by 9 publications

References 67 publications

Systematic investigations of high‐pressure polymorphs in shocked ordinary chondrites

Systematic investigations of high‐pressure polymorphs in shocked ordinary chondrites

Analysis and mitigation of spatial integration errors for the material point method

Optimization and decision-making framework for multi-staged asteroid deflection campaigns under epistemic uncertainties

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