scholarly journals Quantifying turbulence model uncertainty in Reynolds-averaged Navier–Stokes simulations of a pin-fin array. Part 2: Scalar transport

2020 ◽  
Vol 209 ◽  
pp. 104642 ◽  
Author(s):  
Zengrong Hao ◽  
Catherine Gorlé
Keyword(s):  
Turbulence Model ◽  
Model Uncertainty ◽  
Scalar Transport ◽  
Navier Stokes ◽  
Pin Fin ◽  
Reynolds Averaged Navier Stokes ◽  
Pin Fin Array

A Reynolds-Averaged Navier-Stokes Solver in a Turbomachinery Design System

2007 ◽  
Author(s):  
Fahua Gu ◽  
Mark R. Anderson
Keyword(s):  
Turbulence Model ◽  
Stokes Equations ◽  
Three Dimensional ◽  
Integrated Design ◽  
Navier Stokes ◽  
Design System ◽  
Navier Stokes Equations ◽  
Wall Functions ◽  
Machine Performance ◽  
Reynolds Averaged Navier Stokes

The design of turbomachinery has been focusing on the improvement of the machine efficiency and the reduction of the design cost. This paper presents an integrated design system to create the machine geometry and to predict the machine performance at different levels of approximation, including one-dimensional design and analysis, quasi-three-dimensional-(blade-to-blade, throughflow) and full-three-dimensional-steady-state CFD analysis. One of the most important components, the Reynolds-averaged Navier-Stokes solver, is described in detail. It originated from the Dawes solver with numerous enhancements. They include the use of the low speed pre-conditioned full Navier-Stokes equations, the addition of the Spalart-Allmaras turbulence model and an improvement of wall functions related with the turbulence model. The latest upwind scheme, AUSM, has been implemented too. The Dawes code has been rewritten into a multi-block solver for O, C, and H grids. This paper provides some examples to evaluate the effect of grid topology on the machine performance prediction.

Benchmarking Reynolds Averaged Navier–Stokes Turbulence Models in Internal Pin Fin Channels

2017 ◽  
Vol 31 (4) ◽  
pp. 976-982 ◽  
Author(s):  
Royce Fernandes ◽  
Mark Ricklick ◽  
Anish Prasad ◽  
Yogesh Pai
Keyword(s):  
Turbulence Models ◽  
Navier Stokes ◽  
Pin Fin ◽  
Reynolds Averaged Navier Stokes

Compressible Reynolds-Averaged Navier-Stokes Analysis of Wind Turbine Turbulent Flows Using a Fully-Coupled Low-Speed Preconditioned Multigrid Solver

2014 ◽  
Author(s):  
M. S. Campobasso ◽  
M. Yan ◽  
J. Drofelnik ◽  
A. Piskopakis ◽  
M. Caboni
Keyword(s):  
Turbulence Model ◽  
Static Pressure ◽  
Navier Stokes ◽  
Acoustic Analogy ◽  
Mean Flow ◽  
Noise Propagation ◽  
Low Speed ◽  
Analysis And Design ◽  
Reynolds Averaged Navier Stokes ◽  
Fully Coupled

The high-fidelity aeromechanical analysis and design of multi-megawatt horizontal axis wind turbines can be performed by means of Reynolds-averaged Navier-Stokes codes. The compressible or incompressible formulation of the fluid equations can be used. One of the objectives of the paper is to quantify the effects of flow compressibility on the aerodynamics of large turbine rotors with particular attention to the tip region of a 82 m rotor blade featuring a relative Mach number of about 0.3 near rated conditions. Noticeable local static pressure variations due to compressibility are observed. Such variations point to the better suitability of compressible solvers for turbine aerodynamics, not only when the solver is used for direct aeroacoustic simulation of the near field noise propagation, but also when it is used to provide the surface static pressure to be used as input for acoustic analogy noise propagation codes. On the numerical side, a novel numerical approach to low-speed preconditioning of the mean flow and turbulence model equations for the fully coupled integration of the flow equations coupled to a two-equation turbulence model is presented and implemented in a compressible Navier-Stokes research code for the steady and yawed wind-induced time-dependent flows analyzed herein.

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