Imperial College London
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Professor Gareth Collins

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Planetary Science
 
 
 
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Contact

 

+44 (0)20 7594 1518g.collins Website

 
 
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Location

 

4.83Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Stickle:2020:10.1016/j.icarus.2019.113446,
author = {Stickle, AM and Bruck, Syal M and Cheng, AF and Collins, GS and Davison, TM and Gisler, G and Güldemeister, N and Heberling, T and Luther, R and Michel, P and Miller, P and Owen, JM and Rainey, ESG and Rivkin, AS and Rosch, T and Wünnemann, K},
doi = {10.1016/j.icarus.2019.113446},
journal = {Icarus},
pages = {1--24},
title = {Benchmarking impact hydrocodes in the strength regime: Implications for modeling deflection by a kinetic impactor},
url = {http://dx.doi.org/10.1016/j.icarus.2019.113446},
volume = {338},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The Double Asteroid Redirection Test (DART) is a NASA-sponsored mission that will be the first direct test of the kinetic impactor technique for planetary defense. The DART spacecraft will impact into Didymos-B, the moon of the binary system 65803 Didymos, and the resulting period change will be measured from Earth. Impact simulations will be used to predict the crater size and momentum enhancement expected from the DART impact. Because the specific material properties (strength, porosity, internal structure) of the Didymos-B target are unknown, a wide variety of numerical simulations must be performed to better understand possible impact outcomes. This simulation campaign will involve a large parameter space being simulated using multiple different shock physics hydrocodes. In order to understand better the behaviors and properties of numerical simulation codes applicable to the DART impact, a benchmarking and validation program using different numerical codes to solve a set of standard problems was designed and implemented. The problems were designed to test the effects of material strength, porosity, damage models, and target geometry on the ejecta following an impact and thus the momentum transfer efficiency. Several important results were identified from comparing simulations across codes, including the effects of model resolution and porosity and strength model choice: 1) momentum transfer predictions almost uniformly exhibit a larger variation than predictions of crater size; 2) the choice of strength model, and the values used for material strength, are significantly more important in the prediction of crater size and momentum enhancement than variation between codes; 3) predictions for crater size and momentum enhancement tend to be similar (within 1520%) when similar strength models are used in different codes. These results will be used to better design a modeling plan for the DART mission as well as to better understand the potential results that may be
AU  - Stickle,AM
AU  - Bruck,Syal M
AU  - Cheng,AF
AU  - Collins,GS
AU  - Davison,TM
AU  - Gisler,G
AU  - Güldemeister,N
AU  - Heberling,T
AU  - Luther,R
AU  - Michel,P
AU  - Miller,P
AU  - Owen,JM
AU  - Rainey,ESG
AU  - Rivkin,AS
AU  - Rosch,T
AU  - Wünnemann,K
DO  - 10.1016/j.icarus.2019.113446
EP  - 24
PY  - 2020///
SN  - 0019-1035
SP  - 1
TI  - Benchmarking impact hydrocodes in the strength regime: Implications for modeling deflection by a kinetic impactor
T2  - Icarus
UR  - http://dx.doi.org/10.1016/j.icarus.2019.113446
UR  - https://www.sciencedirect.com/science/article/pii/S0019103519302222?via%3Dihub
UR  - http://hdl.handle.net/10044/1/74712
VL  - 338
ER  -
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