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From: Moore, S. <st...@sa...> - 2025-10-21 01:56:35
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Hi Madan, the particles are deleted immediately upon contact. See the doc page https://sparta.github.io/doc/move_surf.html for more details: "After the surface has been moved, then all particles in grid cells that meet either of these criteria are deleted: * the grid cell is now inside a surface * the grid cell overlaps with a surface element that moved This is to prevent particles from ending up inside surface objects." Stan ________________________________ From: Madan B K via sparta-users <spa...@li...> Sent: Monday, October 20, 2025 6:51 PM To: SPARTA Mailing list <spa...@li...> Subject: [EXTERNAL] [sparta-users] surf/move Hello SPARTA developers, I have a question about how particles interact with moving surfaces when using the fix move/surf (and fix move/surf/kk) command. When a surface element is moved using this fix, do particles bounce when they collide with the surface (as in the usual reflection model), or are they deleted immediately upon contact — as if they vanish as soon as they intersect with the moving surface? I’m trying to clarify whether the particle-surface interaction is handled dynamically (reflective) or instant deletion when overlap occurs during motion. Thank you for your time and for maintaining SPARTA! Regards, Madan B K |