{"id":171028,"date":"2023-06-05T07:05:33","date_gmt":"2023-06-05T07:05:33","guid":{"rendered":"\/knowledge\/forums\/topic\/i-am-trying-to-restart-a-transient-cfx-simulation-from-a-previous-results-file-before-starting-the-simulation-i-check-the-box-continue-history-from-initial-values-or-set-the-co\/"},"modified":"2023-07-31T12:29:54","modified_gmt":"2023-07-31T12:29:54","slug":"i-am-trying-to-restart-a-transient-cfx-simulation-from-a-previous-results-file-before-starting-the-simulation-i-check-the-box-continue-history-from-initial-values-or-set-the-co","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-am-trying-to-restart-a-transient-cfx-simulation-from-a-previous-results-file-before-starting-the-simulation-i-check-the-box-continue-history-from-initial-values-or-set-the-co\/","title":{"rendered":"I am trying to restart a transient CFX simulation from a previous results file. Before starting the simulation, I check the box \u201ccontinue History from -> Initial Values\u201d (or set the corresponding command line argument -continue-from-file), and as the initial value I select the last result file \u201coldResults.res\u201d.  The problem I have encountered is that the solver starts from the beginning (t_start=0 [s]) instead of really resuming the time (t_start = t_EndOfPreviousRun). However, it is correctly showing the history of the simulation.  What could be the reason for this behavior?"},"content":{"rendered":"<p>Probably you selected the option &#8220;Value = 0 [s]&#8221; for the initial time. Please check the CCL in the .out-File of your restarted run for the Keyword \u201cINITIAL TIME, see the following sample CCL snippet:  FLOW: Flow Analysis 1   &#038;replace ANALYSIS TYPE:      Option = Transient     EXTERNAL SOLVER COUPLING:        Option = None     END     INITIAL TIME:        Option = Value       Time = 0 [s]     END     TIME DURATION:        Option = Total Time       Total Time = 10 [s]     END     TIME STEPS:        Option = Timesteps       Timesteps = 1 [s]     END   END END  The default option for \u201cINITIAL TIME\u201d would be &#8220;Automatic with Value\u201d, \u201cTime = 0 [s]&#8221;, which sets the initial time to zero if the run is not a restarted one, and to the final time of the previous run if the run is restarted.  The option &#8220;Value&#8221; sets the initial time to zero even if it is a restarted run.   Therefore, for a proper restart where the time is resumed from the previous simulation (t_start = t_EndOfPreviousRun), you must change the option for \u201cINITIAL TIME\u201d to &#8220;Automatic with Value\u201d.<\/p>\n","protected":false},"template":"","class_list":["post-171028","topic","type-topic","status-publish","hentry","topic-tag-17-2","topic-tag-cfx","topic-tag-cfx-restart","topic-tag-continue-history","topic-tag-fluid-dynamics","topic-tag-general-cfx","topic-tag-initial-time","topic-tag-transient-run"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["2\/6\/2023 20:20"],"_bbp_forum_id":["27796"],"_bbp_author_ip":["209.182.204.162"],"_btv_view_count":["4484"],"siebel_km_number":["2046599"],"product_version":["17.2"],"km_published_date":["2017-01-24T00:00:00.000Z"],"family":["Fluid Dynamics"],"application_name":["CFX"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/171028","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\/171028\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=171028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}