Have a look here  https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v241/en/flu_ug/flu_ug_sec_files_data_file_options.html  Looks like it's a Legacy .dat.gz option.Â
If you type it 0 in the TUI that may also recalculate the gradients. It's a shortcut to tell Fluent to calculate zero iterations, but may also do what you need. Alternatively it 1 may be a more reliable option. That will not update the timestep - it adds iterations into the current time step.Â
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