{"id":40248,"date":"2020-01-19T21:45:57","date_gmt":"2020-01-19T21:45:57","guid":{"rendered":"\/forum\/forums\/topic\/how-to-work-with-high-skewness-when-adding-ground-inflation\/"},"modified":"2020-01-19T21:45:57","modified_gmt":"2020-01-19T21:45:57","slug":"how-to-work-with-high-skewness-when-adding-ground-inflation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-work-with-high-skewness-when-adding-ground-inflation\/","title":{"rendered":"How to work with high skewness when adding ground inflation"},"content":{"rendered":"

Is it acceptable to create meshes with high skewness around areas of inflation? If so, would it affect whether the solution with converge or not?<\/p>\n

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I’m currently simulating an FSAE car, and I’ve added 10 layer of inflation to the car walls and the ground, which results in a good chuck of cells being highly skewed (around 3 million cells). <\/p>\n

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Here is the geometry for the simulation:<\/p>\n

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\"Simulation<\/p>\n

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And here are my inflation parameters, quality, and mesh metrics. The first layer thickness was determined using a y+ calculator with a reference length of 2.5 meters.<\/p>\n

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\"Car   <\/p>\n

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\"Mesh<\/p>\n

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\"\"<\/p>\n

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For the inflation, the scope is the entire domain, and the boundaries are the car walls. The same parameters apply for the ground walls. The growth rate is set to 1.5 to reduce skewness for higher levels of inflation layers.<\/p>\n

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1) The ANSYS manual mentions that the max skewness should not exceed 0.99, but a lot of my elements have a skewness close to 0.99. (And the maxiumum is 1, but I’ll have to take a look at the geometry for that.) Will the skewness in inflation significantly affect the time it takes for the solution to converge? Are there any ways to improve mesh quality other than reducing face sizing? <\/p>\n

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2) Would the solution be accurate if I only included inflation in some parts of the ground? (maybe a small patch under the car)<\/p>\n

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 <\/p>\n","protected":false},"template":"","class_list":["post-40248","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["12428"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1552"],"_bbp_subscription":["246646"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["40248"],"_bbp_forum_id":["27790"],"_bbp_engagement":["199","14986","171471","172355"],"_bbp_voice_count":["4"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["103060"],"_bbp_last_active_id":["103060"],"_bbp_last_active_time":["2020-01-21 13:01:39"]},"test":"pvenkatesh"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/40248","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\/40248\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=40248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}