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View article: Large-eddy simulations of conjugate heat transfer in boundary layers over laser-scanned ice roughness
Large-eddy simulations of conjugate heat transfer in boundary layers over laser-scanned ice roughness Open
Accurate modeling of ice accretion is important for safe and efficient design of aircraft and wind turbine systems. Heat transfer predictions obtained from fluid flow solvers are used as input in ice accretion codes. In glaze ice condition…
Turbulence–chemistry interaction in a non-equilibrium hypersonic boundary layer Open
Turbulence–chemistry interaction in a Mach-7 hypersonic boundary layer with significant production of radical species is characterised using direct numerical simulation. Overriding a non-catalytic surface maintained as isothermal at 3000 K…
View article: Predictions of flow distortions inside a serpentine diffuser from large-eddy simulations
Predictions of flow distortions inside a serpentine diffuser from large-eddy simulations Open
This work examines the flow separation and the resulting pressure distortions at the exit plane of a serpentine diffuser operating at both subsonic and transonic conditions. Wallmodeled large-eddy simulations (WMLES) using the charLES flow…
Non-equilibrium wall model for large eddy simulations of complex flows exhibiting turbulent smooth body separation Open
In this work, a non-equilibrium wall model is proposed for the prediction of turbulent flows experiencing adverse pressure gradients, including separated flow regimes. The mean-flow nonequilibrium is identified by comparing two characteris…
Studies of Transonic Aircraft Flows and Prediction of Initial Buffet Onset Using Large-Eddy Simulations Open
This article utilizes the Large-Eddy Simulation (LES) paradigm with a physics-based turbulence modeling approach, including a dynamic subgrid-scale model and an equilibrium wall model, to examine the flow over the NASA transonic Common Res…
View article: Are the dynamics of wall turbulence in minimal channels and larger domain channels equivalent? A graph-theoretic approach
Are the dynamics of wall turbulence in minimal channels and larger domain channels equivalent? A graph-theoretic approach Open
This work proposes two algorithmic approaches to extract critical dynamical mechanisms in wall-bounded turbulence with minimum human bias. In both approaches, multiple types of coherent structures are spatiotemporally tracked, resulting in…
Inverse-Velocity Transformation Wall Model for Reacting Turbulent Hypersonic Boundary Layers Open
The present study builds on prior work by taking advantage of the novel framework proposed by Griffin et al. (hereafter referred to as the GFM) as a baseline. The model is progressively extended to multicomponent reacting mixtures, account…
View article: Are the dynamics of wall turbulence in minimal channels and larger domain channels equivalent? A graph-theoretic approach
Are the dynamics of wall turbulence in minimal channels and larger domain channels equivalent? A graph-theoretic approach Open
This work proposes two algorithmic approaches to extract critical dynamical mechanisms in wall-bounded turbulence with minimum human bias. In both approaches, multiple types of coherent structures are spatiotemporally tracked, resulting in…
An extension of Thwaites’ method for turbulent boundary layers Open
Thwaites ( Aeronaut. Q. , vol. 1, 1949, pp. 245–280) developed an approximate method for determining the evolution of laminar boundary layers. The approximation follows from an assumption that the growth of a laminar boundary layer in the …
View article: Reynolds number dependence of length scales governing turbulent flow separation with application to wall-modeled large-eddy simulations
Reynolds number dependence of length scales governing turbulent flow separation with application to wall-modeled large-eddy simulations Open
This article proposes a Reynolds number scaling of the required grid points to perform wall-modeled LES of turbulent flows encountering separation off a solid surface. Based on comparisons between the various time scales in a non-equilibri…
View article: An extension of Thwaites method for turbulent boundary layers
An extension of Thwaites method for turbulent boundary layers Open
Thwaites (1949) developed an approximate method for determining the evolution of laminar boundary layers. The approximation follows from an assumption that the growth of a laminar boundary layer in the presence of pressure gradients could …
Large-eddy simulations of the NACA23012 airfoil with laser-scanned ice shapes Open
In this study, five ice shapes generated at NASA Glenn's Icing Research Tunnel (IRT) are simulated at multiple angles of attack (Broeren et al., J. of Aircraft, 2018). These geometries target different icing environments, both early-time a…
Near-wall model for compressible turbulent boundary layers based on an inverse velocity transformation Open
In this work, a near-wall model, which couples the inverse of a recently developed compressible velocity transformation (Griffin et al. , Proc. Natl Acad. Sci. , vol. 118, 2021, p. 34) and an algebraic temperature–velocity relation, is dev…
Near-wall model for compressible turbulent boundary layers based on an inverse velocity transformation Open
In this work, a near-wall model, which couples the inverse of a recently developed compressible velocity transformation [Griffin, Fu, & Moin, PNAS, 118:34, 2021] and an algebraic temperature-velocity relation, is developed for high-speed t…
Stable, entropy-consistent, and localized artificial-diffusivity method for capturing discontinuities Open
In this work, a localized artificial-viscosity/diffusivity method is proposed for accurately capturing discontinuities in compressible flows. There have been numerous efforts to improve the artificial diffusivity formulation in the last tw…
View article: Wall modeled large-eddy simulations of flow over the Sandia Axisymmetric Transonic Bump
Wall modeled large-eddy simulations of flow over the Sandia Axisymmetric Transonic Bump Open
Wall-modeled large-eddy simulations (WMLES) are conducted for the flow over the Sandia Axisymmetric Transonic Bump (ATB) at bump chord Reynolds number, Re = 1x10^6 and Mach number, Ma = 0.875. Utilizing various subgrid-scale and wall model…
Atomization of the optimally disturbed liquid jets Open
This paper is associated with a video winner of a 2021 American Physical Society’s Division of Fluid Dynamics (DFD) Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online…
Non-Boussinesq subgrid-scale model with dynamic tensorial coefficients Open
A major drawback of Boussinesq-type subgrid-scale stress models used in large-eddy simulations is the inherent assumption of alignment between large-scale strain rates and filtered subgrid-stresses. A priori analyses using direct numerical…
Non-Boussinesq subgrid-scale model with dynamic tensorial coefficients Open
A major drawback of Boussinesq-type subgrid-scale stress models used in large-eddy simulations is the inherent assumption of alignment between large-scale strain rates and filtered subgrid-stresses. A priori analyses using direct numerical…
View article: Performance of Wall-Modeled LES with Boundary-Layer-Conforming Grids for External Aerodynamics
Performance of Wall-Modeled LES with Boundary-Layer-Conforming Grids for External Aerodynamics Open
We investigate the error scaling and computational cost of wall-modeled large-eddy simulation (WMLES) for external aerodynamic applications. The NASA Juncture Flow is used as representative of an aircraft with trailing-edge smooth-body sep…
Assessment of diffuse-interface methods for compressible multiphase fluid flows and elastic-plastic deformation in solids Open
This work describes three diffuse-interface methods for the simulation of immiscible, compressible multiphase fluid flows and elastic-plastic deformation in solids. The first method is the localized-artificial-diffusivity approach of Cook …
Velocity transformation for compressible wall-bounded turbulent flows with and without heat transfer Open
Significance Near a solid wall, the mean velocity of an incompressible fluid is a nearly universal function of the distance from the wall when appropriately transformed (nondimensionalized). For high-speed compressible flows, due to the wa…
Velocity transformation for compressible wall-bounded turbulent flows\n with and without heat transfer Open
In this work, a transformation, which maps the mean velocity profiles of\ncompressible wall-bounded turbulent flows to the incompressible law of the wall\nis proposed. Unlike existing approaches, the proposed transformation\nsuccessfully c…