{"id":429689,"date":"2025-04-23T07:46:43","date_gmt":"2025-04-23T07:46:43","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/to-avoid-loss-of-geometry\/"},"modified":"2025-04-23T07:46:43","modified_gmt":"2025-04-23T07:46:43","slug":"to-avoid-loss-of-geometry","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/to-avoid-loss-of-geometry\/","title":{"rendered":"To avoid loss of geometry"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;p&gt;I am simulating TPMS(triply periodic minimal surfaces)-structure heat exchanger. My geometry is multiple unit cells (9x9x9mm) of gyroid in rectangular channel with in- and outlet extension as attatched.&lt;\/p&gt;&lt;p&gt;I generated only solid part(gyroid structure) using MS Lattice at first and imported in Spaceclaim to conver to solid body. And then I generated fluid volume using extract volume by generating solid part of channel.&lt;\/p&gt;&lt;p&gt;Using Fault Tolerant Meshing I got some final mesh in 4-5 Million Cell number. But I found loss of geometry at sharp edge in solid part or even at flat surface in fluid volume. Since I want to apply periodic boundary condition on the side wall, I want to avoid such loss. Although I tried extract edge by decreasing angle gradually, there was no difference. If I decrease cell size, then the size of loss also decrease. But not disappeared.&lt;\/p&gt;&lt;p&gt;Can anyone help me to get rid of these losses. They are actually detected after surface meshing.&lt;\/p&gt;&lt;p&gt;Or is it possible to apply periodic boundary condtion in solver with these losses?&lt;br&gt;Regarding to periodic boundary condition, I have one more question. Isn&#8217;t it necessary to define periodic bc during meshing in the case of FTM?&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/04\/23-04-2025-1745394309-geometry.PNG\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/04\/23-04-2025-1745394225-loss at flat surface.PNG\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-429689","topic","type-topic","status-publish","hentry","topic-tag-fault-tolerant-1","topic-tag-meshing","topic-tag-Periodicboundarycondition-1","topic-tag-TPMS-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27790"],"_bbp_topic_id":["429689"],"_bbp_subscription":["539038"],"_bbp_author_ip":["137.193.238.151"],"_bbp_last_reply_id":["429690"],"_bbp_last_active_id":["429690"],"_bbp_last_active_time":["2025-04-23 07:47:59"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["1"],"_bbp_engagement":["539038"],"_btv_view_count":["106"],"_bbp_topic_status":["unanswered"]},"test":"hyein-kimtum-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/429689","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\/429689\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=429689"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}