Numerical simulations of the flow surrounding particle agglomerates were carried out using computational fluid dynamics to assess ability five RANS turbulence models estimate drag coefficient in agglomerates. Simulations steady conditions for Reynolds numbers between 1 and 1500. Streamlines showed that symmetrical present a velocity profile similar single sphere profile. Results both Spalart-Al...

This study presents an extension of a previous (On Exact Step Length in Gradient-Based Aerodynamic Shape Optimization) to viscous transonic flows. In this work, we showed that the same procedure derive explicit expression for exact step length βexact gradient-based optimization method inviscid flows can be employed The extended numerical was evaluated over RAE 2822 airfoil at two common flow co...

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 ...

The aerodynamic performance of the high-lift configuration greatly influences safety and economy commercial aircraft. Accurately predicting configuration, especially stall behavior, is important for aircraft design. However, complex flow phenomena configurations pose substantial difficulties to current turbulence models. In this paper, a three-equation k-(v^2)-{\omega} model Reynolds-averaged N...

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...

Shell and tube heat exchangers are used to transfer thermal energy from one medium another for regulating fluid temperatures in the processing pasteurizing industries. Enhancement of a rate is desired maximize efficiency shell exchangers. In this research work, we performed computational dynamics (CFD) simulations experimental analysis on using round hexagonal tubes range flow velocities both p...

Numerical simulations based on a high-order discontinuous Galerkin solver were performed to investigate two-dimensional flapping foils at moderate Reynolds numbers, moving with different prescribed harmonic motion laws. A Spalart–Allmaras RANS model and without an algebraic local transition modification was employed for the resolution of multiple kinematic configurations, considering both moder...

Adaptive morphing trailing edge wings have the potential to reduce the fuel burn of transport aircraft. In this paper, we quantify the aerodynamic performance benefits of a morphing trailing using aerodynamic design optimization. The aerodynamic model solves the Reynolds-averaged Navier– Stokes equations with a Spalart–Allmaras turbulence model. A gradient-based optimization algorithm is used i...

The effect of a wind gust on the aerodynamic characteristics of a rigid wing undergoing insect-based flapping motion is studied numerically. The turbulent flow near the flapping wing is described by the 3-D unsteady compressible Reynolds-Averaged Navier-Stokes equations with the Spalart-Allmaras turbulence model. The governing equations are solved using a second-order node-centered finite volum...