Abstract Feature selection targets for selecting relevant and useful features, is a vital challenge in turbulence modeling by machine learning methods. In this paper, new posterior feature method based on validation dataset proposed, which an efficient universal complex systems including turbulence. Different from the priori importance ranking of filter exhaustive search subset wrapper method, ...

The effects of elastic cavity walls on noise generation at transonic speed are investigated for the generic M219 cavity. flow is simulated with Spalart–Allmaras (SA) improved delayed detached-eddy simulation (IDDES) turbulence model in combination a wall function. structural analysis software uses modal formulation. first 50 normal mode shapes included simulation, spanning frequencies 468–2280 ...

Abstract The blended-wing body is an aircraft configuration that has the potential to be more efficient than conventional large transport aircraft configurations with the same capability. However, the design of the blended-wing is challenging due to the tight coupling between aerodynamic performance, trim, and stability. Other design challenges include the nature and number of the design variab...

This article presents a new turbulence closure based on the k-ω SST model for predicting turbulent flows of Herschel–Bulkley fluids, including Bingham and power-law fluids. The has been calibrated with direct numerical simulations (DNS) data fully-developed pipe flow shear-thinning viscoplastic shows good agreement in mean velocity, average viscosity, shear stress budget friction factor. latter...

Low-fidelity methods such as the Blade Element Momentum Theory frequently provide rotor aerodynamic performances. However, these must be coupled to databases or correlations compute heat transfer. The literature lacks average transfer around airfoil. present study develops for an over smooth and rough correlation coefficients were obtained from a CFD database using RANS equations Spalart–Allmar...

We numerically investigate stalling flow around a static airfoil at high Reynolds numbers using the Reynolds-averaged Navier–Stokes equations (RANS) closed with Spalart–Allmaras turbulence model. An arclength continuation method allows to identify three branches of steady solutions, which form characteristic inverted S-shaped curve as angle attack is varied. Global stability analyses these solu...

A novel penalized wall function method for simulations of wall-bounded compressible turbulent flows is proposed. The new approach based on the Reynolds-averaged Navier–Stokes (RANS) equations to model outer region boundary layer, while inner part approximated by equilibrium model. differential formulation match external and solutions reformulated in a form generalized characteristic-based volum...

This report presents the use of a time-marching threedimensional (3-D) compressible Navier-Stokes equation numerical solver with a one-equation turbulence model to simulate the flow fields developed along concave wall surfaces without and with a downstream extension flat wall surface. The 3-D Navier-Stokes numerical solver came from the NASA Glenn-HT code. The one-equation turbulence model was ...