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This study concerns wavepackets in laminar turbulent transition in a Blasiusboundary layer. While initial amplitude and frequency have well-recognizedroles in the transition process, the current study on the combined effects ofamplitude, frequency, and bandwidth on the propagation of wavepackets isbelieved to be new. Because of the complexity of the system, these jointvariations in multiple parameters could give rise to effects not seen throughthe variation of any single parameter. Direct numerical simulations (DNS) areutilized in a full factorial (fully crossed) design to investigate bothindividual and joint effects of variation in the simulation parameters, with aspecial focus on three distinct variants of wavepacket transition {\textemdash}the reverse Craik triad formation sequence, concurrent N-type and K-typetransition and abrupt shifts in dominant frequency. From our factorial study,we can summarize the key transition trends of wavepackets as follows:  1. Broad bandwidth wavepackets predominantly transit to turbulence via theN-route. This tendency remains strong even as the frequency width is reduced.  2. Narrow bandwidth wavetrains exhibit predominantly K-type transition. Thefront broadband part of an emerging wavetrain may experience N-type transition,but this wavefront should not be considered as a part of truly narrow-bandwidthwavepackets.  3. K-type transition is the most likely for wavepackets that are initiatedwith high energy/amplitude and/or with the peak frequency at the lower branchof the neutral stability curve.

Combined effects of amplitude, frequency and bandwidth on wavepackets in laminar turbulent transition