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Showing 1 to 20 of 205 for “"Reynolds Averaged Navier-Stokes"”.
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An automated reliable method for two-dimensional Reynolds-Averaged Navier-Stokes simulations
… strategy is presented for two-dimensional Reynolds-averaged Navier-Stokes (RANS) flows and is based on: a higher-order discontinuous Galerkin finite element method which enables higher accuracy with fewer degrees of freedom than lower-order methods; an output-based error estimation and …
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An adaptive high order Reynolds-averaged Navier-Stokes solver with transition prediction
The use of simulation techniques in applied aerodynamics has increased dramatically in the last three decades fostered by the growth in computational power. However, the state of the art discretization in industrial solvers remains nominally second order accurate, which makes them unfeasible to …
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Geometry-Aware Modeling of Rough-Wall Turbulence Using Reynolds-Averaged Navier-Stokes (RANS) Frameworks
… the representation of roughness effects in Reynolds-Averaged Navier–Stokes (RANS) turbulence models remains fundamentally challenging. Classical approaches rely on hydrodynamic equivalence, typically through the equivalent sand-grain roughness height and empirical shifts of the logarithmic …
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The development of reynolds averaged navier stokes solver for a two dimensional compressible flow problem
… initial form of governing equation called the Navier-Stokes equations; the flow can be simplified as the Laplace equation. When the incompressible condition cannot be maintained, the compressibility effects have to be taken into account due to the increasing incoming velocity, while the …
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A high-order, adaptive, discontinuous Galerkin finite element method for the Reynolds-Averaged Navier-Stokes equations
… Galerkin (DG) discretizations of the Reynolds-Averaged Navier-Stokes (RANS) equations and an output-based error estimation and mesh adaptation algorithm for these discretizations. In particular, DG discretizations of the RANS equations with the Spalart-Allmaras (SA) turbulence model …
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Quantification of Reynolds-averaged-Navier-Stokes Model Structural Hypothesis Uncertainty in Transitional Boundary Layer and Airfoil Flows
… hypothesis is intrinsic to many Reynolds-averaged-Navier-Stokes (RANS)-based turbulence models and transition models. Although its drawback has been well acknowledged, the uncertainty it induces on RANS predictions of transitional flows has been ignored so far due to the …
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Reynolds-Averaged Navier-Stokes Computation of Tip Clearance Flow in a Compressor Cascade Using an Unstructured Grid
… in full agreement with the law of the wall up to Reynolds number of 1.0E8, however, the skin friction coefficient is under-predicted by about 10% in comparison with empirical formula. Blade loading for the two-dimensional circular arc cascade is also compared with experiments. The results obtained …
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Horizontal pressure gradient and bed shear stress under double dam-break driven swash and validation of a Reynolds-Averaged Navier-Stokes equations based model
… hydrodynamic data for each case were ensemble averaged and verified a numerical model solving the two-dimensional (2D) Reynolds-Averaged Navier-Stokes (RANS) equations simulating a double dam break. The model allows for visualization of the hydrodynamic data over the entire domain and is used …
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Computational Fluid Dynamics (CFD) modelling of renewable energy turbine wake interactions
… discs with the solution of incompressible Reynolds-Averaged Navier-Stokes equations with the k-ω SST turbulence models. Simulations were initially conducted of a single turbine in water and air and then two axially aligned turbines to study the flow field interactions. These models were …
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Simulation of spike stall inception in a radial vanted diffuser
… stall inception. A steady three-dimensional Reynolds-averaged Navier-Stokes simulation using a mixing plane was carried out first to evaluate the effects of bleed air at impeller exit on stage and diffuser subcomponent performance. The steady simulation was compared with experimental …
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Numerical calculations for flows past an unconventional airfoil
… have been obtained by solving the steady-state Reynolds-averaged Navier-Stokes equations in primitive variable form. The standard k-$\varepsilon$ turbulence model was employed and a compression turbulence model was also discussed. Based on a non-staggered arrangement on a body-fitted grid …
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Turbulent Simulations of a Buoyant Jet-in-Crossflow
… computational approach using the incompressible Navier--Stokes equations (NSE) under the Boussinesq approximation is utilized. Temperature and salinity scalar transport equations are utilized in conjunction with a linear equation of state (EOS) to obtain the density field and thus the buoyancy …
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Evaluation of Mixing-Limited Quasi-Global Wind-US Model for HIFiRE 2 Flowpath
<p>A Reynolds-averaged Navier-Stokes computational model featuring a mixing-limited, quasi-global chemical kinetics approach for an ethylene-methane fuel mixture is described and used in a validation effort against the Hypersonic International Flight Research Experimentation (HIFiRE) Direct Connect …
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Aerodynamic and Structural Design of a Winglet for Enhanced Performance of a Business Jet
… analysis was performed for that winglet with Reynolds averaged Navier-Stokes computational fluid dynamics and finite element analysis. Range and fuel burn were finally calculated for a typical mission using these refined results. The selected winglet, with a span of 3.219 ft, a cant angle of …
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Quantification of structural uncertainties in RANS turbulence models
… model for the structural uncertainties in Reynolds averaged Navier-Stokes (RANS) turbulence models. This approach solves an inference problem by comparing the results of RANS calculations to direct numerical simulation. The adjoint method is used to efficiently solve an inverse problem to …
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Numerical Simulation of UVA Ramjet/Scramjet Hypersonic Engine with Hydrogen-Air Combustion Using Wind-US
… was simulated using Wind-US, a density-based Reynolds-Averaged Navier-Stokes flow solver. Detailed flowfield simulation results are directly compared to experimental data to evaluate the accuracy of the numerical model and to provide insight into the flowfield behavior. Four hydrogen-air …
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Computational Investigation of Perforated Plate Film Cooling Utilizing Conjugate Heat Transfer
… A numerical investigation is performed using the Reynolds Averaged Navier Stokes equations and compared to NASA Glenn’s available Turbulent Heat Flux 4 experimental measurements collected as a part of the Transformational Tools and Technologies Project. A multiphysics approach to model heat …
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A numerical investigation of compressible flow in a curved S-duct
… is studied using numerical simulation of the Reynolds-averaged Navier-Stokes equations on an unstructured grid in three spatial dimensions. Results are compared to existing experimental steady-state data to validate the computed solutions. Effects of grid resolution, including boundary layer …
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Sensitivity study of turbulent flow simulations over a rotating disk
… This can be achieved if a flow is modeled with Reynolds-Averaged Navier-Stokes turbulence models. To reduce uncertainties associated with numerical simulations from the simulation results, one has to ensure the convergence of results with respect to various simulation parameters. In this paper, …
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