{"id":160280,"date":"2023-08-08T10:15:22","date_gmt":"2023-08-08T10:15:22","guid":{"rendered":"\/knowledge\/forums\/topic\/discovery-explore-how-to-retain-a-certain-portion-of-the-geometry-in-topology-optimization\/"},"modified":"2023-08-16T06:33:43","modified_gmt":"2023-08-16T06:33:43","slug":"discovery-explore-how-to-retain-a-certain-portion-of-the-geometry-in-topology-optimization","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/discovery-explore-how-to-retain-a-certain-portion-of-the-geometry-in-topology-optimization\/","title":{"rendered":"Discovery Explore: How to retain a certain portion of the geometry in topology optimization?"},"content":{"rendered":"<p><strong>Problem:<\/strong>\u00a0When trying to do the topology optimization for a part, and if some regions are not required to be optimized (material removal is not expected), but Discovery Explore does not retain it and it tries to optimize based on the constraining conditions provided.<\/p>\n<p>For a scenario with a downward acting force of 1000N on the A-arm, the middle connecting portion\u00a0<em>(highlighted in orange)<\/em>\u00a0is required to be retained after optimization. The force application and the middle portion highlighted is as shown below,<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-156119\" src=\"\/knowledge\/wp-content\/uploads\/sites\/4\/2022\/08\/OK-65-1.png\" alt=\" width=\" height=\"459\" \/><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-157714\" src=\"\/knowledge\/wp-content\/uploads\/sites\/4\/2022\/08\/OK-N1.png\" alt=\" width=\" height=\"553\" \/><\/p>\n<p>After the topology optimization, the optimized shape looks as shown below, where the material in the middle connecting portion in the A-arm is removed.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-157715\" src=\"\/knowledge\/wp-content\/uploads\/sites\/4\/2022\/08\/OK-N2.png\" alt=\" width=\" height=\"648\" \/><\/p>\n<p><strong>Causes:<\/strong>\u00a0There is no input provided which enables the software to exclude the region from topology optimization.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Workarounds:\u00a0<\/strong>\u00a0There is no standard feature to exclude regions from optimization studies, although there are workarounds to do so.<\/p>\n<ul>\n<li><strong>Applying small pressure on the faces that are to be retained.<\/strong><\/li>\n<\/ul>\n<p>If a small (close to 0 Pa) pressure is applied on the faces, the software excludes the volume to a thickness of protected distance specified, and the region is excluded from the topology optimization.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-156121\" src=\"\/knowledge\/wp-content\/uploads\/sites\/4\/2022\/08\/OK-65-2.png\" alt=\" width=\" height=\"400\" \/><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-156124\" src=\"\/knowledge\/wp-content\/uploads\/sites\/4\/2022\/08\/OK-65-3.png\" alt=\" width=\" height=\"404\" \/><\/p>\n<ul>\n<li><strong>Applying dummy displacement boundary conditions with all DOFs free on the faces that are to be retained.<\/strong><\/li>\n<\/ul>\n<p>If a dummy displacement boundary condition with all DOFs free is applied on the faces, the software will exclude the volume till a thickness of protected distance specified, and the region is excluded from the topology optimization.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-156125\" src=\"\/knowledge\/wp-content\/uploads\/sites\/4\/2022\/08\/OK-65-4.png\" alt=\" width=\" height=\"400\" \/><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-156129\" src=\"\/knowledge\/wp-content\/uploads\/sites\/4\/2022\/08\/OK-65-5.png\" alt=\" width=\" height=\"404\" \/><\/p>\n<ul>\n<li><strong>Applying dummy mass of 0kg on the faces\u00a0that are to be retained.<\/strong><\/li>\n<\/ul>\n<p>If the simulation includes gravity effect, a zero kg mass can also be applied to the faces that are to be retained.<\/p>\n","protected":false},"template":"","class_list":["post-160280","topic","type-topic","status-publish","hentry","topic-tag-explore-faq","topic-tag-topology-optimization"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["09-15-2022  20:20:26"],"_bbp_forum_id":["159543"],"_edit_lock":["1691659599:76844"],"_edit_last":["76844"],"_bbp_topic_id":["160280"],"_btv_view_count":["5659"],"_yoast_wpseo_content_score":["30"],"_yoast_wpseo_estimated-reading-time-minutes":["3"],"_wp_old_date":["2022-09-26"],"_application_name":["field_64a80903c8e15"],"_family":["field_64a809229a857"],"siebel_km_number":[""],"_siebel_km_number":["field_63ecbffce60db"],"salesforce_km_number":[""],"_salesforce_km_number":["field_63ecc018e60dc"],"km_published_date":[""],"_km_published_date":["field_64c77704499dd"],"_product_version":["field_64c776cb4fd2e"],"family":["Discovery Products"],"application_name":["Discovery"],"product_version":["2020R2"],"_bbp_likes_count":["1"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/160280","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/160280\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=160280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}