{"id":162698,"date":"2021-09-30T19:15:18","date_gmt":"2021-09-30T19:15:18","guid":{"rendered":"\/forum\/forums\/topic\/capturing-internal-hydrostatic-pressure-response-of-a-fluid-contained-shell\/"},"modified":"2021-10-02T06:57:19","modified_gmt":"2021-10-02T06:57:19","slug":"capturing-internal-hydrostatic-pressure-response-of-a-fluid-contained-shell","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/capturing-internal-hydrostatic-pressure-response-of-a-fluid-contained-shell\/","title":{"rendered":"Capturing Internal Hydrostatic Pressure Response of a Fluid Contained Shell"},"content":{"rendered":"
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Hi everyone,<\/p>\n

I am trying to create a simulation to verify the following experiment: a 3D printed ellipsoid shell is filled with water and attached to a spring which is fixed to the ground (See image 1). We have positioned pressure sensors on the internal shell wall in both the coup and contrecoup regions (this experiment has to do with correlating impact acceleration to internal pressure for investigation of traumatic brain injury). Our ellipsoid shell is then impacted with a mass attached to a pendulum and the corresponding internal pressure values are recorded. <\/p>\n

I am trying to model the fluid structure interaction of the internal fluid when the ellipsoid is subject to an impact from a ball (see image 2). So far I have been trying to use the ALE method (defining solid bodies as Lagrangian and fluid bodies as Eularian), but I am seeing unexpected results where the internal fluid compresses when in contact with a Lagrangian body and the aft fluid region does not deform at all (see attached GIF). <\/p>\n

My questions are the following:<\/p>\n

    \n
  1. Is the ALE method the correct approach for such a problem – and if so, are there any specific settings I need include other than basic Euler domain controls in analysis settings?<\/li>\n
  2. Why is my fluid body not behaving as a fluid contained within the shell? – is there a certain element type of water material definition I should be using? (I am currently defining water based on a Explicit Dynamics example for a soda can being crushed where E=1.32Pa, and Poisson=0.4999)<\/li>\n
  3. Is there another solver out there that can give me similar results that may be easier to implement?<\/li>\n
  4. I am starting to look into the HSFLD241\/242 hydrostatic elements, but my APDL skills are weak. Would this be a good avenue to pursue?<\/li>\n<\/ol>\n

    Any suggestions on how to model the impact (or just a force input) and resulting hydrostatic pressure wave propagation and FSI would be greatly appreciated. <\/p>\n

    Thanks,<\/p>\n

    Aaron<\/p>\n

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    \n
    \n\"Figure1.png\"
    \n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-162698","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_old_reply_author_name_id":["Anonymous"],"_bbp_old_is_reply_anonymous_id":["false"],"_btv_view_count":["1083"],"_bbp_likes_count":["0"],"_bbp_subscription":["239444"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["162698"],"_bbp_forum_id":["27814"],"_bbp_engagement":["13468","58821","221379"],"_bbp_voice_count":["3"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["193586"],"_bbp_last_active_id":["193586"],"_bbp_last_active_time":["2021-10-02 06:57:19"]},"test":"aaron-jackson2mavs-uta-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/162698","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/162698\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=162698"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}