Cross-Hatching Studies-A Critical Review

Swigart, Rudolph J.

doi:10.2514/3.49482

Cited by 13 publications

(4 citation statements)

References 32 publications

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“…[1][2][3] These patterns can be reproduced by experiment. 3,4) Spherical glass bodies were put into a high-enthalpy and high-speed flow and similar surface melting patterns were observed on the windward surface.…”

Section: Introductionmentioning

confidence: 92%

“…This trend is also observed in experiments. [1][2][3][4]11) In the later section we discuss the reason. Since the phenomenon is unsteady, the thickness changes with time.…”

Section: Flow Field Analysismentioning

confidence: 99%

“…3,4) They include: (l) differential ablation theory, (2) surface liquid film theory and (3) inelastic surface deformation theory. The differential ablation theory assumes that initial shape perturbations of the body surface affect the flowfield and cause the perturbations to get larger.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Surface Melting Due to Aerodynamic Heating

Shinjo

Kubota

2005

Trans. Japan Soc. Aero. S Sci.

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This paper presents a numerical study on surface melting pattern formation due to aerodynamic heating. When aerodynamic heating is severe enough to melt the surface of a flying body, the interaction between the melted layer and the external flow creates surface patterns. The present study succeeds in reproducing surface melting patterns, and results show the same trend as predicted by theory and experiment. The instability mechanism is mainly governed by surface friction and surface pressure fluctuations. These two factors act as driving forces on the surface. The surface pattern formation is characterized by the amplification factor and the wavelength factor. The results show the same trend as the experiments and the validity of the present analysis has been demonstrated.

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Section: Introductionmentioning

confidence: 92%

“…This trend is also observed in experiments. [1][2][3][4]11) In the later section we discuss the reason. Since the phenomenon is unsteady, the thickness changes with time.…”

Section: Flow Field Analysismentioning

confidence: 99%

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Numerical Simulation of Surface Melting Due to Aerodynamic Heating

Shinjo

Kubota

2005

Trans. Japan Soc. Aero. S Sci.

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“…Laganelli and Zempel [9] investigated the emergence of cross-hatched surface patterns on the surface of ablating cones. Early work surrounding this fluid dynamics phenomenon focused on establishing the fundamental physics behind their formation [10]. It was established that a sufficiently thin supersonic transitional or turbulent boundary layer is a necessary condition for the patterns to appear.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Streamwise Steps and Cavities Geometry on Supersonic Turbulent Boundary Layer

Ch’ng

Teryaev

Sidhu

et al. 2020

CFDL

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In some cases, the nozzle of a rocket engine could deform during manufacturing or testing, flare up and distort during operation in such a way that periodically repeating structures of depressions and protrusions form on the wall surface. Complex configurations of roughness topologies have been experimentally observed to form due to this fluid-structure interaction and have been known to distort the boundary layer and increase local drag and heat transfer. A numerical experiment was carried out using ANSYS FLUENT to assess the effects of geometry (streamwise wavelengths ? and length-to-depth ratios (L/D)) of discrete roughness topologies in the form of steps and cavities on flow field distortions and resulting total drag. It was found that cavity L/D ratios of 19.8 – 23.1 and 12.8 – 15.5 yielded the highest drag coefficients. The flow fields over these periodic arrays exhibited closed and a combination of closed cavity type features, and it can be concluded that the flow phenomena associated with separation caused by forward facing steps in closed cavity type topologies contributed the most to the total drag. L/D ratios of 6.3 – 8.4 exhibited the lowest drag coefficient. The lower drag coefficient is due to the modification of the turbulent boundary layer by the trapped coherent vortical structure within the cavities. Pressure forces become more dominant as the surface wavelength is decreased. For all cases, there was a pronounced increase in the boundary layer thickness after each successive cavity.

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Cross-Hatching — An Interaction between Shock and Turbulent Boundary Layer

Qun¹

1982

Three-Dimensional Turbulent Boundary Layers

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Cross-Hatching Studies-A Critical Review

Cited by 13 publications

References 32 publications

Numerical Simulation of Surface Melting Due to Aerodynamic Heating

Numerical Simulation of Surface Melting Due to Aerodynamic Heating

The Impact of Streamwise Steps and Cavities Geometry on Supersonic Turbulent Boundary Layer

Cross-Hatching — An Interaction between Shock and Turbulent Boundary Layer

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