{"id":450613,"date":"2026-01-19T01:30:42","date_gmt":"2026-01-19T01:30:42","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/model-failure-after-full-restart\/"},"modified":"2026-01-22T01:35:24","modified_gmt":"2026-01-22T01:35:24","slug":"model-failure-after-full-restart","status":"answered","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/model-failure-after-full-restart\/","title":{"rendered":"Model failure after full restart"},"content":{"rendered":"<p>&lt;p&gt;Hello, I am modelling a soil column for a seismic analysis. First I run a gravity analysis for 10 sec incl. DR phase, which works fine. After the DR phase there are still some slight oscillations in the first 2sec, after that the model is perfectly still (in equilibrium). When I do a full restart however with the last d3dump, the model blows up. I do not change loading or boundary conditions in the restart deck, the only thing I change is I add the *STRESS_INITITIALIZATION card to tell Dyna its a full restart, extend the termination time to 20 sec, and in the *CONTROL_DR card I set idrflg to -999, since I should not need DR anymore as the equilibrated state should be imported (other than that the restart input is just a copy of the input file of the first run). However, very early on in the analysis the model distorts massively when viewing the d3plot output. The messag file of the restart run does complete, but says that the timestep got very large. The elout file only prints NaN for stress and strains&#8230; Hoping somebody can help me find out what is going wrong. (I know I could simply use the dynain file instead of restart, but then I always get these oscillations in the first ~2 sec. They are small, but anyway. I would like to know why the restart does not work&#8230;) Thanks&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-450613","topic","type-topic","status-answered","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello, I am modelling a soil column for a seismic analysis. First I run a gravity analysis for 10 sec incl. DR phase, which works fine. After the DR phase there are still some slight oscillations in the first 2sec, after that the model is perfectly still (in equilibrium). 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