Laminar and transition studies
Studies of Boundary Layer Transition from Laminar to Turbulent
... In figure 2, we see the velocity distributions in the y-z plane in the lower half of the channel. The contours show the streamwise component (u), while the wall-normal (v) and spanwise (w) components are shown by arrows, ...
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DNS of Laminar-Turbulent Transition in Swept-Wing Boundary Layers
... complete transition due to crossflow vortices in order to understand the breakdown mechanisms responsible for the onset of ...of transition (Rist & Fasel 1995) or on the fully developed tur- bulent ...
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Laminar-to-turbulent transition of pipe flows through puffs and slugs
... above-mentioned studies support the contention that the laminar-to- turbulent transition of pipe flows takes place in the form of puff structures for Re = DU/ν 6 2500, and slug structures for Re & ...
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Scale-Resolving Simulations of Laminar-to-Turbulent Transition in Swept-Wing Flow
... flow transition on a realistic geometry with extended region of laminar flow, from the onset and growth of Tollmien-Schlichting (TS) and crossflow modes to secondary instabilities and three-dimensional ...
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Numerical investigation of the interaction between laminar to turbulent transition and the wake of an airfoil
... sections studies have shown similarities with flat plate studies without clearly identifying these ...the transition and the vortex physics should be glob- ally the same, the way Kelvin–Helmholtz ...
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An Experimental Study On Flow Of Water Through Porous Media In Laminar, Transition And Turbulent Regime
... As early as 1901 Forchheimer was the first to realize that Darcy‘s law was not universally valid for flow through porous media, he noted that at higher Reynolds number, the linear relationship between hydraulic gradient ...
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Laminar-Turbulent Transition Behind Discrete Roughness Elements in a High-Speed Boundary Layer
... that transition over a broad range of roughness sizes may be caused by instability modes of the wake flow, it is useful to examine how these instability modes may be generated in practice as well as the nonlinear ...
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Laminar-Turbulent Transition Upstream of the Entropy-Layer Swallowing Location in Hypersonic Boundary Layers
... experimental studies have demonstrated that modal growth of planar Mack modes is responsible for laminar-turbulent transition on sharp cones at hypersonic ...to transition onset upstream of ...
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Optimisation of Natural Laminar Flow Aerofoils and Wings for Robustness to Critical Transition Amplification Factor
... gradient-based studies focus on coupling of the transition model with the flow solver, and so few consider off-design performance or ...premature transition on a NLF ...free transition and ...
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Performance trade-off studies for a retrofit Hybrid Laminar Flow Control system
... III. Impact on predicted HLFC performance of aerodynamic assumptions and tools The dependence of the suction system specification upon the ‘control N-factor’ constraint is as significant for the chamber-based design as ...
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Measurements and Prediction of Laminar- Turbulent Transition at High Free-Stream Turbulence in Boundary Layers with Pressure Gradients
... layer transition by modeling the near the wall fluctuations of velocity induced in the laminar boundary ...the transition Reynolds number depends on the turbulence level and on how strong the ...
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An experimental study on laminar-turbulent transition at high free-stream turbulence in boundary layers with pressure gradients
... experimental studies using the pressure gradient ...the transition Reynolds number depends on the turbulence level and on how strong the curvature is and seems to have a non-negligible effect in low ...
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Laminar to Turbulent Transition in Cylindrical Pipes
... z Turbulence activity inside a slug is irrespective of source z At same Re all Puffs have same length. z The boundaries of the slugs are relatively clearly[r] ...
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Comparison of several models of the laminar/turbulent transition
... the laminar/turbulent transition using several transition ...models. Transition models of various types were tested: a) the model with the algebraic equation for the intermittency coefficient ...
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Transition in a Laminar Separation Bubble and the Effect of Acoustic Excitation
... in Figs. 5.16b and 5.16c, developing spanwise undulations which are most notable at z/l ≈ −0.1 and 0.3, where forward streamwise bulges form. Concurrently, the follow- ing vortex in the shedding process, labelled as B, ...
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The Effect of Curvature on the Transition from Laminar to the Turbulent Boundary Layer
... Thia led the authors to attempt reaking a series of turbulence :profiles for various speed at severel :points... After tbese profiles had been made,a great.[r] ...
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RANS Simulation of Laminar-Turbulent Transition in Separation Bubbles on Airfoils
... for transition tools ...triggered transition on the suction side, but without triggering a short separation bubble appears near the leading edge with incidences as low as 1 ...
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Supersonic quiet-tunnel development for laminar-turbulent transition research
... Comparisons of predictions and experiments for a Mach 3 two-dimensional nozzle [17] showed the development of crossflow along the nozzle walls. However, in this investigation, the crossf[r] ...
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Laminar - turbulent transition in the propagation of height contained hydraulic fracture
... limiting laminar, turbulent smooth and turbulent rough flow ...a transition from turbulent to laminar at some point along the fracture length, depending on the value of inlet Reynolds ...
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Laminar Turbulent Boundary Layer Transition Imaging Using IR Thermography
... the transition front by picking the location with the largest result of this dot product at each row in the ...where transition is believed to be ...
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