{"id":453659,"date":"2026-03-03T14:02:11","date_gmt":"2026-03-03T14:02:11","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/scaling-magnetic-units\/"},"modified":"2026-03-03T14:02:11","modified_gmt":"2026-03-03T14:02:11","slug":"scaling-magnetic-units","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/scaling-magnetic-units\/","title":{"rendered":"Scaling magnetic units"},"content":{"rendered":"<p>&lt;p&gt;I understand LS Dyna is &#8220;unitless&#8221; where everything is built off of relative scaling.&nbsp; If my mesh sizing is in mm, mass units are input in grams, I should be working with pascals and uN.&nbsp; What I was wondering, is how to scale the magnetic units to fit this.&nbsp; As many magnetic units are based off of Amps, which don&#8217;t necessarily have a relation to mm, grams, or seconds.&nbsp;&nbsp;&lt;\/p&gt;&lt;p&gt;From what I understand, EM keywords (or at least *EM_EXTERNAL_FIELD)&nbsp; use B field in Tesla.&nbsp; Which can be written as N\/(Am).&nbsp; To scale that for a mm\/g\/uN system, it means that a numerical value put in would be on the scale of mTesla, right?&lt;\/p&gt;&lt;p&gt;*EM_PERMANENT_MAGNET specifically mentions Hc being written in A\/m (pg 488 in the Em manual <a href=\"https:\/\/lsdyna.ansys.com\/wp-content\/uploads\/2025\/04\/LS-DYNA_Manual_Vol_III_R16.pdf\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/lsdyna.ansys.com\/wp-content\/uploads\/2025\/04\/LS-DYNA_Manual_Vol_III_R16.pdf<\/a>), for my unit system that should be scaled to A\/mm. Or am I reading the manual wrong; where remark 1 is simply telling me how I should scale a given A\/m value to B field values, and like the rest of the EM keywords, all values should be written as a B field in some scale of Tesla.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-453659","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["453659"],"_bbp_subscription":["645102","13937"],"_bbp_author_ip":["193.205.81.18"],"_bbp_last_reply_id":["454914"],"_bbp_last_active_id":["454914"],"_bbp_last_active_time":["2026-03-20 17:05:08"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["645102","13937"],"_btv_view_count":["124"],"_bbp_topic_status":["unanswered"]},"test":"troy-bakersantannapisa-it"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/453659","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\/453659\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=453659"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}