{"id":309611,"date":"2023-10-01T15:45:32","date_gmt":"2023-10-01T15:45:32","guid":{"rendered":"\/forum\/forums\/reply\/309611\/"},"modified":"2023-10-01T15:45:54","modified_gmt":"2023-10-01T15:45:54","slug":"309611","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/309611\/","title":{"rendered":"Reply To: iostream error"},"content":{"rendered":"<p>&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Maybe this will help others. I did get the same error message but could just fix it by deactivating the usage of CFF-File-Format using the command line&nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;&rdquo;file\/cff-files? no&rdquo;. See also: Fluent 2020R1 &gt; Fluent User&rsquo;s Guide &gt; 3.3.4. Reading and Writing Files in the Legacy Format&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;Context: I had an old simulation with 40 time steps that was simulated using ANSYS Fluent 2020R1 and the results were saved as <em>.cas.gz <\/em>and <em>.dat.gz<\/em> . When I tried to extend the calculation for 40 more time steps in a newer Version or even in&nbsp;ANSYS Fluent 2020R1 Fluent tries to use the <em>.cas.h5<\/em> and <em>.dat.h5<\/em> formats. This can be suppressed with the command above for the present Session only or also for future Sessions via the preferences, see User&rsquo;s Guide entry above. Now, the extended calculation saves every time step in the old\/legacy format, without error messages.&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;font-size: 12pt;&#8221;&gt;This is also helpful, because I can now use CFD-Post to have it read all time steps and generate Animation sequences from it. The features that Fluent offers are not sufficient in my case.&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-309611","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/309611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/309611\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=309611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}