Status of the NASA/Virginia Tech Benchmark Experiments for CFD Validation

The BeVERLI (Benchmark Validation Experiment for RANS/LES Investigations) Hill project aims at producing a detailed experimental database of three-dimensional non-equilibrium turbulent boundary layers with various levels of separation while meeting the most exacting requirements of computational fluid dynamics validation as per Oberkampf and Smith [1]. A group of the Science and Technology Organization (STO) of the North Atlantic Treaty Organization (NATO) entitled NATO AVT-349 -"Non-Equilibrium Turbulent Boundary Layers in High Reynolds Number Flow at Incompressible Conditions" has recently considered the BeVERLI Hill case. Their goal is to advance the accuracy and range of prediction models for high Reynolds number non-equilibrium boundary layers. This highly collaborative and international group comprised of various academic, governmental, and industrial institutions has performed several Reynolds-averaged Navier-Stokes (RANS) simulations of the BeVERLI Hill using different grids, solvers, and turbulence models. The resulting solutions and available experimental data are presented in this paper to summarize and highlight key features, sensitivities, and the current predictive capability of RANS for the BeVERLI Hill case. The results suggest important sensitivities to Reynolds number, grid density, iterative converge,

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“…𝑖 𝑗 (2.0𝐼 2 − 𝐼 5 + 2.0)+ 𝑇 8 𝑖 𝑗 (𝐼 1 − 𝐼 2 − 𝐼 3 + 6.15)− 𝑇 9 𝑖 𝑗 (𝐼 2 + 𝐼 3 − (𝐼 3 − 0.15) (𝐼 5 − 0.15) − 1.178).…”

Section: Appendix Aunclassified

“…𝑖 𝑗 = 𝑇 1 𝑖 𝑗 (4.0𝐼 2 − 2𝐼 1 + 2.15)+ 𝑇 2 𝑖 𝑗 (𝐼 5 − 𝐼 1 (1.911𝐼 3 − 𝐼 1 + 𝐼 5 ) + 1.0)− 𝑇 4𝑖 𝑗 (2.0𝐼 2 − 12.0)+ 𝑇8 𝑖 𝑗 (𝐼 1 )+ 𝑇9 𝑖 𝑗 (6𝐼 2 + 𝐼 1 𝐼 5 + 18.089).…”

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Computations of the BeVERLI Hill Three-dimensional Separating Flow Model Validation Cases

Gargiulo

Ozoroski

Hallock

et al. 2022

AIAA SCITECH 2022 Forum

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“…The experimental geometries often take the form of three-dimensional wall-mounted bumps or hills. A few notable three-dimensional flow separation studies are the FAITH 'Hill' model (Bell et al 2012), the NASA juncture flow experiment (Rumsey et al 2016;Kegerise & Neuhart 2019), the Virginia Tech wall-bounded bump (Lowe et al 2020) and the Boeing 'speed bump' (Gray et al 2021), the last three of which have attempted or are attempting new levels of experimental validation.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization of smooth body flow separation topography and topology on a two-dimensional geometry of finite span

et al. 2022

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A smooth body, adverse pressure gradient (APG), turbulent boundary layer (TBL) separation is experimentally studied. The geometry features canonical TBL development prior to encountering a smooth, two-dimensional convex ramp geometry of finite span onto which a streamwise APG that is fully adjustable is imposed. Both large- and small-scale separations are studied, and all data are archived on the NASA Turbulence Modeling Resource website. This paper describes the large-scale separation case with focus on the surface topography and topology of both separation and reattachment. Despite the spanwise uniform approach TBL and ramp geometry, the separation is highly three-dimensional but the reattachment is spanwise uniform. The surface flow topology is characterized by the ‘owl-face pattern of the fourth kind’ – found to be highly repeatable over multiple experiments. This ubiquitous topology has been reported for a variety of flows including inclined bodies of revolution. It is demonstrated that the APG and the secondary flow associated with the sidewall–ramp juncture is responsible for the formation of the surface separation patterns.

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Examples of Wind Tunnels for Testing Wind Turbine Airfoils

Yilmaz¹

2021

Handbook of Wind Energy Aerodynamics

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Status of the NASA/Virginia Tech Benchmark Experiments for CFD Validation

Cited by 12 publications

References 9 publications

Computations of the BeVERLI Hill Three-dimensional Separating Flow Model Validation Cases

Computations of the BeVERLI Hill Three-dimensional Separating Flow Model Validation Cases

Experimental characterization of smooth body flow separation topography and topology on a two-dimensional geometry of finite span

Examples of Wind Tunnels for Testing Wind Turbine Airfoils

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