{"id":346875,"date":"2024-01-28T02:24:21","date_gmt":"2024-01-28T02:24:21","guid":{"rendered":"\/forum\/forums\/topic\/time-averaged-wall-metrics-in-ensight-from-ls-dyna-fsi-results\/"},"modified":"2024-01-28T02:24:21","modified_gmt":"2024-01-28T02:24:21","slug":"time-averaged-wall-metrics-in-ensight-from-ls-dyna-fsi-results","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/time-averaged-wall-metrics-in-ensight-from-ls-dyna-fsi-results\/","title":{"rendered":"Time-averaged Wall Metrics in EnSight from LS-DYNA FSI Results"},"content":{"rendered":"

Greetings,<\/p>\n

I recently conducted some FSI simulations of an aortic valve using ANSYS LS-DYNA ICFD coupled with it’s implicit structural solver. I have all the d3plot’s saved and am able to load them into ANSYS EnSight.<\/p>\n

A common metric that people in my field look at is called the time-averaged WSS (TAWSS) which is an integral over a cardiac cycle of the WSS magnitude of a particular surface. Similarly, we also look at a another wall metric called oscillatory shear index (OSI) which also has a time integral form. I’ve attached the equations below.<\/p>\n

\"\"<\/p>\n

If the fluid surface was constant throughout the run, meaning no remeshing, theseformulas are easy to calculate using the provided TempMean and SpaMean functions as well as just by exporting the nodal data per time-step and then processing in MATLAB or Python. <\/p>\n

However, since this is an FSI simulation, the severe deformations result in the ICFD solver undergoing 100s of remeshes. This changes the connectivity of the mesh each time and there is no clear way for me to calculate these temporal metrics now because the nodes of one time point don’t relate to the next. There is a step during remeshing where the old variables are mapped to the new one but there is no details given on how the nodes of one mesh correspond to the nodes of the remeshed mesh.<\/p>\n

EnSight does not allow the use of TempMean for meshes with changing connectivity, as highlighted in the manual. <\/p>\n

Is there some way I could calculate these time-averaged metrics on a surface that changes mesh connectivity due to its deformation? <\/p>\n

Thank You,<\/p>\n

Asad<\/p>\n","protected":false},"template":"","class_list":["post-346875","topic","type-topic","status-closed","hentry","topic-tag-2-way-fsi","topic-tag-ensight","topic-tag-icfd-1","topic-tag-ls-dyna","topic-tag-valve"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["162868","13694"],"_bbp_author_ip":["23.206.193.146"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["958"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["346875"],"_bbp_forum_id":["27792"],"_bbp_engagement":["13694","162868"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["348686"],"_bbp_last_active_id":["348686"],"_bbp_last_active_time":["2024-02-03 03:19:12"]},"test":"amirz013"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/346875","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\/346875\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=346875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}