{"id":392533,"date":"2024-11-04T08:21:18","date_gmt":"2024-11-04T08:21:18","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/when-csf-is-introduced-using-dem-sph-particles-are-popped\/"},"modified":"2024-11-04T08:21:18","modified_gmt":"2024-11-04T08:21:18","slug":"when-csf-is-introduced-using-dem-sph-particles-are-popped","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/when-csf-is-introduced-using-dem-sph-particles-are-popped\/","title":{"rendered":"When CSF is introduced using DEM-SPH, particles are popped."},"content":{"rendered":"

<p><\/p><p>Dear Community,<\/p><div class=”flex-shrink-0 flex flex-col relative items-end”><div><div class=”pt-0″><div class=”gizmo-bot-avatar flex h-8 w-8 items-center justify-center overflow-hidden rounded-full”> <\/div><\/div><\/div><\/div><div class=”group\/conversation-turn relative flex w-full min-w-0 flex-col agent-turn”><div class=”flex-col gap-1 md:gap-3″><div class=”flex max-w-full flex-col flex-grow”><div class=”min-h-8 text-message flex w-full flex-col items-end gap-2 whitespace-normal break-words [.text-message+&]:mt-5″ dir=”auto” data-message-author-role=”assistant” data-message-id=”369d7c79-881e-4458-98bd-3d1767838dfc” data-message-model-slug=”gpt-4o”><div class=”flex w-full flex-col gap-1 empty:hidden first:pt-[3px]”><div class=”markdown prose w-full break-words dark:prose-invert dark”><p>I am currently using DEM-SPH to calibrate the cone penetration test (CPT). However, even with the default CSF model, the SPH and DEM particles are behaving unpredictably, “bursting” like popcorn during the cone penetration process as shown in the above figures.<\/p><p>In realistic conditions, DEM and SPH particles should flow and remain contained within the soil apparatus rather than bouncing away. How can we reduce this divergence of particles to achieve more accurate simulation results?<\/p><p>Alternatively, could it be that the CSF model is not suitable for this CPT scenario?<br>Configuration: The setup uses Volumetric Fill, with sand (DEM) and water (SPH) particles distributed throughout the entire region. The SPH settings are currently set to default, with the CSF model applied.<\/p><p>Additionally, I have read that an overly large time step might cause SPH particles to diverge. Could someone advise on how to verify and adjust the time step setting currently used by Ansys Rocky?<\/p><p>Thank you very much for your assistance.<\/p><p>Best regards,<br>Hiroki Yanagawa<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"template":"","class_list":["post-392533","topic","type-topic","status-publish","hentry","topic-tag-fluid","topic-tag-rocky-dem-1","topic-tag-soil","topic-tag-soil-modeling","topic-tag-soil-structure-interation-1","topic-tag-sph"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t