{"id":457655,"date":"2026-05-06T08:55:03","date_gmt":"2026-05-06T08:55:03","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/different-capacitance-results-between-two-conductive-plates-with-different-autom\/"},"modified":"2026-05-06T08:55:03","modified_gmt":"2026-05-06T08:55:03","slug":"different-capacitance-results-between-two-conductive-plates-with-different-autom","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/different-capacitance-results-between-two-conductive-plates-with-different-autom\/","title":{"rendered":"Different capacitance results between two conductive plates with different autom"},"content":{"rendered":"

<p>I am simulating the capacitance between two conductive plates<\/strong>. The plate-to-plate distance is swept from:<\/p><p>Hmin = 0.0011202 mm<\/strong><br>to<br>Hmax = 4 mm<\/strong><\/p><p>The geometry, material setup, boundary conditions, and distance sweep are the same in all cases. However, I tested three different automatic mesh configurations and compared the capacitance result:<\/p><table><thead><tr><th>Case Study<\/th><th>Mesh Refinement<\/th><th>Dynamic Surface Resolution<\/th><th>TAU Mesh<\/th><th align=”right”>Hmin<\/th><th align=”right”>Hmax<\/th><th align=”right”>Maxwell Result (pF)<\/th><th align=”right”>Q3D Result (pF)<\/th><\/tr><\/thead><tbody><tr><td>Case 1<\/td><td>Maximum<\/td><td>Disabled<\/td><td>Disabled<\/td><td align=”right”>0.0011202 mm<\/td><td align=”right”>4 mm<\/td><td align=”right”>20.16<\/td><td align=”right”>14.96<\/td><\/tr><tr><td>Case 2<\/td><td>Maximum<\/td><td>Enabled<\/td><td>Disabled<\/td><td align=”right”>0.0011202 mm<\/td><td align=”right”>4 mm<\/td><td align=”right”>12.25<\/td><td align=”right”>10.04<\/td><\/tr><tr><td>Case 3<\/td><td>Maximum<\/td><td>Enabled<\/td><td>Enabled<\/td><td align=”right”>0.0011202 mm<\/td><td align=”right”>4 mm<\/td><td align=”right”>23.18<\/td><td align=”right”>10.00<\/td><\/tr><\/tbody><\/table><p>Issue:<\/strong><br>The calculated capacitance changes significantly depending on the automatic mesh settings, although the model setup is unchanged. For example, the Maxwell result changes from 12.25 pF<\/strong> to 23.18 pF<\/strong>, while the Q3D result changes from 10.00 pF<\/strong> to 14.96 pF<\/strong> over the same distance range.<\/p><p>Question:<\/strong><\/p><section class=”text-token-text-primary w-full focus:outline-none [–shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(–shadow-height) has-data-writing-block:pt-(–shadow-height) [&:has([data-writing-block])>*]:pointer-events-auto [content-visibility:auto] supports-[content-visibility:auto]:[contain-intrinsic-size:auto_100lvh] R6Vx5W_threadScrollVars scroll-mb-[calc(var(–scroll-root-safe-area-inset-bottom,0px)+var(–thread-response-height))] scroll-mt-[calc(var(–header-height)+min(200px,max(70px,20svh)))]” dir=”auto” data-turn-id=”request-WEB:f025bfb5-c7c3-445c-a49e-59efae53e9e2-20″ data-testid=”conversation-turn-12″ data-scroll-anchor=”false” data-turn=”assistant”><div class=”text-base my-auto mx-auto pb-10 [–thread-content-margin:var(–thread-content-margin-xs,calc(var(–spacing)*4))] @w-sm\/main:[–thread-content-margin:var(–thread-content-margin-sm,calc(var(–spacing)*6))] @w-lg\/main:[–thread-content-margin:var(–thread-content-margin-lg,calc(var(–spacing)*16))] px-(–thread-content-margin)”><div class=”[–thread-content-max-width:40rem] @w-lg\/main:[–thread-content-max-width:48rem] mx-auto max-w-(–thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn”><div class=”flex max-w-full flex-col gap-4 grow”><div class=”min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+&]:mt-1″ dir=”auto” tabindex=”0″ data-message-author-role=”assistant” data-message-id=”47c77b4d-5355-4f69-b091-b38500ece09d” data-message-model-slug=”gpt-5-5-thinking” data-turn-start-message=”true”><div class=”flex w-full flex-col gap-1 empty:hidden”><div class=”markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling”><p data-start=”42″ data-end=”424″ data-is-last-node=”” data-is-only-node=””>Why do the capacitance results vary so much between these automatic mesh configurations? For capacitance extraction between two conductive plates, which software should I trust more, <strong data-start=”241″ data-end=”271″>ANSYS Maxwell or ANSYS Q3D<\/strong>, and which mesh configuration should be considered the most reliable? Also, what is the recommended procedure to verify mesh convergence for this model?<br><br>https:\/\/drive.google.com\/file\/d\/1UkA5H-PwPPw-MLbwMty-_IaUeAUvFFgo\/view?usp=drive_link<\/a><\/p><\/div><\/div><\/div><\/div><div class=”mt-3 w-full empty:hidden”> <\/div><\/div><\/div><\/section><\/p>\n","protected":false},"template":"","class_list":["post-457655","topic","type-topic","status-publish","hentry","topic-tag-adaptivemesh-2","topic-tag-meshing"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27793"],"_bbp_topic_id":["457655"],"_bbp_subscription":["561412","675360"],"_bbp_author_ip":["2001:638:208:1101:da10:3f07:433:bdc5"],"_bbp_last_reply_id":["457789"],"_bbp_last_active_id":["457789"],"_bbp_last_active_time":["2026-05-07 14:00:23"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["561412","675360"],"_btv_view_count":["56"],"_bbp_topic_status":["unanswered"]},"test":"saeed-sedighrptu-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/457655","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\/457655\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=457655"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}