{"id":302642,"date":"2023-08-22T06:56:03","date_gmt":"2023-08-22T06:56:03","guid":{"rendered":"\/forum\/forums\/topic\/element-highly-distorted-in-a-nonlinear-simulation\/"},"modified":"2023-08-22T06:56:03","modified_gmt":"2023-08-22T06:56:03","slug":"element-highly-distorted-in-a-nonlinear-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/element-highly-distorted-in-a-nonlinear-simulation\/","title":{"rendered":"Element highly distorted in a nonlinear simulation"},"content":{"rendered":"<p class=\"md-end-block md-p md-focus\"><span class=\"md-plain md-expand\">It&#8217;s a simple simulation about heart valve. I simply add pressure to the leaflet surface in a static structural. The leaflets are created by ACP and bonded to the aorta by MPC.<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">But the simulation always can not get converged with an error of &#8220;element XXX highly distorted&#8221;. Sometimes the element seems to be ok, as the picture shown.<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-image md-img-loaded\" data-src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/21-08-2023-1692637457-mceclip0.png\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/21-08-2023-1692637457-mceclip0.png\" alt=\"img\"><\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">In simulations, large deflection is always turned on.<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">I have changed these ways: <\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">1.mesh element size from 0.2 to 1.6 mm. <\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">2.turn on auto time step and increase the substep number of each step to 5000.<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">3.set Newton-Raphson option as unsymmetric.<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">4.set the bond contact formulation as pure penalty with 0.1 normal stiffness <\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">5.use the direct solver.<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">6.use shell elements for simulation<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">But all these never worked out. Because the leaflets are created by acp, I wonder is it possible to use the NLAD\uff1f<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-image md-img-loaded\" data-src=\"C:\\Users\\Administrator\\AppData\\Roaming\\Typora\\typora-user-images\\image-20230822143639425.png\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/22-08-2023-1692687027-mceclip1.png\"><\/span><\/p>\n<p class=\"md-end-block md-p md-focus\"><span class=\"md-plain md-expand\">I would appreciate it if anyone can give me some advise.Here is one of my test projects without solution.<\/span><\/p>\n<p><a title=\"My workbench project \" href=\"https:\/\/drive.google.com\/file\/d\/1MrPlfW2dw-4kVkj7CaEiPDaZMnKmnMzz\/view?usp=sharing\" target=\"_blank\" rel=\"noopener\">https:\/\/drive.google.com\/file\/d\/1MrPlfW2dw-4kVkj7CaEiPDaZMnKmnMzz\/view?usp=sharing<\/a><\/p>\n","protected":false},"template":"","class_list":["post-302642","topic","type-topic","status-closed","hentry","topic-tag-highly-distorted","topic-tag-large-deflection","topic-tag-structural-nonlinear"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"It&#039;s a simple simulation about heart valve. I simply add pressure to the leaflet surface in a static structural. The leaflets are created by ACP and bonded to the aorta by MPC.But the simulation always can not get converged with an error of &quot;element XXX highly distorted&quot;. 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