“…Transitions from steady solutions to time-periodic and finally fully time-dependent solutions without any discernible period occur as a parameter is varied in a domain containing Hopf bifurcations. ROMs for the jet flow problem have been previously studied in [12,8,11,20,10,14], while an investigation of ROMs for the cavity flow problem can be found in [13,8]. Various intrusive and also data-driven ROMs for bifurcating problems have been investigated also in [25,7,23,22,21,2,16,19,18,15].…”