Hybrid acoustic prediction methods have an important advantage over the current Reynolds averaged Navier-Stokes (RANS) based methods in that they only involve modeling of the relatively universal subscale motion and not the configuration dependent larger scale turbulence. Unfortunately, they are unable to account for the high frequency sound generated by the turbulence in the initial mixing lay...

A random flow generation (RFG) technique is presented, which can be used for initial/inlet boundary generation in LES (Large-Eddy-Simulations) or particle tracking in LES/RANS (Reynolds-Averaged Navier-Stokes) computations of turbulent flows. The technique is based on previous methods of synthesizing divergencefree vector fields from a sample of Fourier harmonics and allows to generate nonhomog...

Abstract Turbulence pervades most flows of engineering interest, and its prediction remains a challenge on both accuracy cost. One promising predictive approach that reduces cost combines large‐eddy simulation (LES) with based Reynolds averaged Navier–Stokes equations (RANS). This study presents method to overcome stability issues associated these hybrid LES‐RANS methods. The developed involves...

Developing accurate wall functions for LES is a great challenge. This is indeed also the case also for RANS. It can be argued that it should be easier to develop accurate wall functions for LES than for RANS. In a well-resolved LES using wall functions, the task of the wall function is to give an instantaneous wall shear stress; this does probably not need to be exactly correct. Compare with in...

In many engineering and industrial applications, the investigation of rotating turbulent flow is of great interest. In rotor-stator cavities, the centrifugal and Coriolis forces have a strong influence on the turbulence by producing a secondary flow in the meridian plane composed of two thin boundary layers along the disks separated by a non-viscous geostrophic core. Most numerical simulations ...

The paper employs a Reynolds-averaged Navier–Stokes (RANS) approach to investigate the time-dependent wave breaking processes. The numerical model is the smoothed particle hydrodynamic (SPH) method. It is a mesh-free particle approach which is capable of tracking the free surfaces of large deformation in an easy and accurate way. The widely used two-equation k–εmodel is chosen as the turbulence...

Numerical simulations of complex large-scale flow systems must capture a variety of physical phenomena in order to predict the flow accurately. Currently, many flow solvers are specialized to simulate one part of a flow system effectively, but are either inadequate or too expensive to be applied to a generic problem. As an example, the flow through a gas turbine can be considered. In the compre...

The numerical analysis of the mechanisms governing the flow in the porous region is of a priority interest for modeling porous media flows. The present study is a prerequisite for elaborating the efficient turbulence modeling techniques in porous media flows. The main objective of present study is to provide a detailed pore scale description of fluid flow and to analyze the formation of the coh...

The Flux Reconstruction Method/ Correction Procedure via Reconstruction (FR/ CPR) is a high-order numerical method for computational fluid dynamics. It combines the Finite Element method and the Finite Volume method, with a polynomial distribution of variables in a computational cell, and Riemann solver applied at the cell boundaries. The FR/ CPR method has a similar resolving ability to the fa...

Submit Manuscript | http://medcraveonline.com Space Agency; MELOS: Mars Exploration with Lander-Orbiter Synergy; JAXA: Japan Aerospace Exploration Agency; ARES: Aerial Regional-scale Environmental Survey; L/D: Lift-to-Drag Ratio; LES: Large-Eddy Simulations; DNS: Direct Numerical Simulation; MABE: Mars Airplane Balloon Experiment; RANS: Reynolds Averaged Navier-Stokes; CFRP: Carbon Fiber-Reinfo...