Academic Journal
Benchmarking impact hydrocodes in the strength regime: Implications for modeling deflection by a kinetic impactor
| Τίτλος: | Benchmarking impact hydrocodes in the strength regime: Implications for modeling deflection by a kinetic impactor |
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| Συγγραφείς: | Stickle, AM, Bruck Syal, M, Cheng, AF, Collins, GS, Davison, TM, Gisler, G, Güldemeister, N, Heberling, T, Luther, R, Michel, P, Miller, P, Owen, JM, Rainey, ESG, Rivkin, AS, Rosch, T, Wünnemann, K |
| Συνεισφορές: | Science and Technology Facilities Council (STFC) |
| Πηγή: | 24 ; 1 |
| Στοιχεία εκδότη: | Elsevier BV |
| Έτος έκδοσης: | 2019 |
| Συλλογή: | Imperial College London: Spiral |
| Θεματικοί όροι: | 0201 Astronomical and Space Sciences, 0402 Geochemistry, 0404 Geophysics, Astronomy & Astrophysics |
| Περιγραφή: | 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 15‐20%) 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 expected due to unknown target properties. The ... |
| Τύπος εγγράφου: | article in journal/newspaper |
| Γλώσσα: | English |
| Relation: | Icarus; http://hdl.handle.net/10044/1/74712; ST/N000803/1; ST/S000615/1 |
| DOI: | 10.1016/j.icarus.2019.113446 |
| Διαθεσιμότητα: | http://hdl.handle.net/10044/1/74712 https://doi.org/10.1016/j.icarus.2019.113446 |
| Rights: | © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Αριθμός Καταχώρησης: | edsbas.D6884BD9 |
| Βάση Δεδομένων: | BASE |
| DOI: | 10.1016/j.icarus.2019.113446 |
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