{"id":2,"date":"2026-11-04T08:39:16","date_gmt":"2026-11-04T08:39:16","guid":{"rendered":"https:\/\/collab.issibern.ch\/shock-physics-codes\/?page_id=2"},"modified":"2026-11-04T09:15:16","modified_gmt":"2026-11-04T09:15:16","slug":"sample-page","status":"publish","type":"page","link":"https:\/\/collab.issibern.ch\/shock-physics-codes\/","title":{"rendered":"Scientific Rationale"},"content":{"rendered":"\r\n<p class=\"wp-block-paragraph\"><b>Cohesion matters on small bodies, but can current numerical models actually handle it?<\/b><\/p>\r\n<p><b>&#8211; Recent missions reveal asteroid surfaces far weaker than expected (like cappuccino foam). <\/b><span style=\"font-weight: 400;\">Hayabusa2 SCI experiment (Ryugu) and DART (Dimorphos) produced larger crater\/more ejecta than predicted.<\/span><\/p>\r\n<p><b>&#8211; The gap: The low-gravity low-strength environment is very difficult to reproduce on Earth.<\/b><\/p>\r\n<p><span style=\"font-weight: 400;\">Shock-physics codes (iSALE, Bern SPH, SWIFT, pkdgrav3) offer a powerful way to model this regime. <\/span><b><i>But they need to be systematically validated in the low-cohesion, low-gravity regime of small bodies. Benchmarking is needed before these models can address key mission questions.<\/i><\/b><\/p>\r\n<p>&nbsp;<\/p>\r\n<p>The Objectives are<\/p>\r\n<ol>\r\n<li><span style=\"font-weight: 400;\">Validate codes against reduced-gravity granular-flow (rotating-tumbler) experiments.<\/span><\/li>\r\n<li><span style=\"font-weight: 400;\">Validate against laboratory impact-cratering experiments.<\/span><\/li>\r\n<li><span style=\"font-weight: 400;\">Benchmark the continuum codes against each other in mission-relevant micro-gravity regimes.<\/span><\/li>\r\n<li><span style=\"font-weight: 400;\">Compare continuum (SPH) and discrete (DEM) approaches to map where each applies.<\/span><\/li>\r\n<li><span style=\"font-weight: 400;\">Publish open community reference benchmarks: specifications, reference solutions and analysis tools.<\/span><\/li>\r\n<\/ol>\r\n<p><br style=\"font-weight: 400;\" \/><br style=\"font-weight: 400;\" \/><br style=\"font-weight: 400;\" \/><\/p>\r\n<p><br \/><br style=\"font-weight: 400;\" \/><br style=\"font-weight: 400;\" \/><br \/><\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>Cohesion matters on small bodies, but can current numerical models actually handle it? &#8211; Recent missions reveal asteroid surfaces far weaker than expected (like cappuccino foam). Hayabusa2 SCI experiment (Ryugu) and DART (Dimorphos) produced larger crater\/more ejecta than predicted. &#8211; The gap: The low-gravity low-strength environment is very difficult to reproduce on Earth. Shock-physics codes [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/collab.issibern.ch\/shock-physics-codes\/wp-json\/wp\/v2\/pages\/2","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/collab.issibern.ch\/shock-physics-codes\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/collab.issibern.ch\/shock-physics-codes\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/collab.issibern.ch\/shock-physics-codes\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/collab.issibern.ch\/shock-physics-codes\/wp-json\/wp\/v2\/comments?post=2"}],"version-history":[{"count":3,"href":"https:\/\/collab.issibern.ch\/shock-physics-codes\/wp-json\/wp\/v2\/pages\/2\/revisions"}],"predecessor-version":[{"id":20,"href":"https:\/\/collab.issibern.ch\/shock-physics-codes\/wp-json\/wp\/v2\/pages\/2\/revisions\/20"}],"wp:attachment":[{"href":"https:\/\/collab.issibern.ch\/shock-physics-codes\/wp-json\/wp\/v2\/media?parent=2"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}