{"id":362999,"date":"2024-04-18T16:08:42","date_gmt":"2024-04-18T16:08:42","guid":{"rendered":"\/forum\/forums\/topic\/applying-gravity-and-earthquake-in-z-direction\/"},"modified":"2024-04-18T16:08:42","modified_gmt":"2024-04-18T16:08:42","slug":"applying-gravity-and-earthquake-in-z-direction","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/applying-gravity-and-earthquake-in-z-direction\/","title":{"rendered":"applying gravity and earthquake in z direction"},"content":{"rendered":"<p>Dear all,<\/p>\n<p>&nbsp;<\/p>\n<p>I have an important question about this topic. I want to apply the earthquake in z direction to the tank fill of water with the box floating on it like top figure. I add one more picture to show it better here. I need to first gravity initialize the box and after it reached equilibrium, I am going to apply earthquake just in Z direction. It is basically two step. Step one, from 0 to 5 second, I just apply graviry through a inclined curve and then apply earquake at 5 second ( the acceleration that I provided starts after 5 second). My problem is that I need the base of the tank to be fixed in z direction in order to gravity initiation, but for the next step that I want to apply acceleration in z direction, I need that DOF in z direction to be free. If I fix DOF in z direction, my tank doesn&#8217;t more in z direction when earthquake applies but the first step (gravity initialization) reaches equilibrium and the problem with having the DOF in z direction free, it doesn&#8217;t converge in the gravity initialization and box starts to rotate. Do you have any solution for me? I did the same thing for Y direction and the results were successful because for applying earthquake in y direction, I don&#8217;t need to free the DOF in z direction free and I could get reasonable response. Appreciate any suggestions. <img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/18-04-2024-1713456518-mceclip0.png\"><\/p>\n","protected":false},"template":"","class_list":["post-362999","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Dear all, I have an important question about this topic. I want to apply the earthquake in z direction to the tank fill of water with the box floating on it like top figure. I add one more picture to show it better here. 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