Computational Investigation of Step Excrescence Sensitivity in a Swept-Wing Boundary Layer

Tufts, Matthew W.; Reed, Helen L.; Crawford, Brian K.; Duncan, Glen T.; Saric, William S.

doi:10.2514/1.c033892

Cited by 41 publications

(114 citation statements)

References 25 publications

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“…Backward-facing steps were found by Tufts et al 121 to not amplify the stationary modes. The existence of an additional local traveling instability was found in the helical recirculation region following the step.…”

Section: Swifter/swiftest Computationsmentioning

confidence: 94%

“…Forward-facing steps were found by Tufts et al 121 to affect the transition location only once a critical step height was exceeded. This height was associated with sudden amplification of stationary crossflow modes and transition moving forward to the step.…”

Section: Swifter/swiftest Computationsmentioning

confidence: 97%

“…See Figure 8b. Tufts et al 121 then reasoned that the height of the center of the crossflow vortex would roughly correspond to the critical forward facing step height. By finding the location within the clean (no step) boundary layer of the maximum v (vertical velocity) perturbation of the stationary crossflow linear stability theory eigenmodes, one can estimate the allowable tolerance for forward-facing step excrescences.…”

Section: Swifter/swiftest Computationsmentioning

confidence: 98%

“…Tufts et al 121 modeled the SWIFTER and SWIFTEST configurations and operating conditions. For this study the basic state includes the flowfield over the SWIFTER/-EST model 1) mounted on the O-2A (including all influencing aircraft features) and 2) installed in the KSWT facility (including the tunnel walls and other features).…”

Section: Swifter/swiftest Computationsmentioning

confidence: 99%

“…The first step was to calculate the flowfield surrounding the entire aircraft in a manner similar to that described in past FRL experiments by Rhodes et al 114 and Tufts et al 118 for a clean (no excrescences) model. These flight conditions were then used to inform the boundary conditions for smaller (in spatial dimensions) grids surrounding the immediate area of the step excrescence (Tufts et al 121 ).…”

Section: Swifter/swiftest Computationsmentioning

confidence: 99%

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Receptivity: The Inspiration of Mark Morkovin (Invited)

Reed

Saric

2015

45th AIAA Fluid Dynamics Conference

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This paper provides a review of the current findings in receptivity for subsonic/transonic flows, including a discussion of the origin of the concept via Mark Morkovin, a remarkable aeronautical engineer, educator, and colleague. Disturbances external to the boundary layer -whether freestream sound or vorticity -can interact with surface roughness, the leading edge, or other inhomogeneities and enter the boundary layer as steady and/or unsteady fluctuations of the basic state. This process establishes the initial conditions of disturbance amplitude, frequency, phase, and scales for the breakdown of laminar flow. The past decades have seen considerable progress in the understanding of receptivity mechanisms guided by the roadmap (Morkovin et al. 1 ).

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Section: Swifter/swiftest Computationsmentioning

confidence: 94%

Section: Swifter/swiftest Computationsmentioning

confidence: 97%

Section: Swifter/swiftest Computationsmentioning

confidence: 98%

Section: Swifter/swiftest Computationsmentioning

confidence: 99%