The flow of dilute suspensions in a rotating filter separator consisting of a rigid, porous, polyethylene cylindrical filter rotating within an outer cylindrical shell was studied using laser-based velocity measurement techniques. The centrifugal instability of the Taylor–Couette flow results in toroidal vortices stacked in the annulus. The velocity field of the particles is very similar to tha...

Vortical structures and instability mechanisms of the unsteady free surface wave-induced separation around a surface-piercing NACA0024 foil at a Froude number of 0.37 and a Reynolds number of 1.52 10 are studied using an unsteady Reynolds-averaged Navier–Stokes (URANS) code with a blended k e/k o turbulence model and a free surface tracking method. At the free surface, the separated flow reatta...

The mechanism of turbulence development in periodic Klebanoff transition in a boundary layer has been studied experimentally and in a direct numerical simulation (DNS) with controlled disturbance excitation. In order to compare the results quantitatively, the flow parameters were matched in both methods, thus providing complementary data with which the origin of turbulence in the transition pro...

An understanding of the vortical structures which comprise the vortical flowfield around slender bodies is essential for the development of highly maneuverable and high angle of attack flight. This is primarily due to the physical limits these phenomena impose on aircraft and missile s at extreme flight conditions. Demands for more maneuverable air vehicles have pushed the limits of current CFD...

The flow fields of direct numerical simulation turbulent channel are decomposed into large scales and small based on the interscale energy transfer spectra. former is characterized by streaks quasi-streamwise vortices even in outer layer, latter hairpin-like vortical structures that similar to original fields. We further investigated coherent associated with real-space transfer. formation small...

This study clarifies the fundamental mechanism by which porous coatings suppress supersonic mode instability in hypersonic boundary layer (BL) using Doak's momentum potential theory. The independent energy budget equations for vortical, acoustic, and thermal components of instabilities are derived. Data from direct numerical simulations Mach 6.0 flat plate flows on a solid wall then analyzed. B...

the current study presents the results of the aerodynamic noise prediction of the flow field around a naca 0012 airfoil at a chord-based reynolds number of 100,000 and at 8.4 degree angle of attack. an incompressible large eddy simulation (les) turbulence model is applied to obtain the instantaneous turbulent flow field. the noise prediction is performed by the ffowcs williams and hawkings (fw-...

For rotationally constrained convection, the Taylor–Proudman theorem enforces an organization of nonlinear flows into tall columnar or compact plume structures. While coherent structures in convection under moderate rotation are exclusively cyclonic, recent experiments for rapid rotation have revealed a transition to equal populations of cyclonic and anticyclonic structures. Direct numerical si...

Scalability studies are performed for CFDShip-Iowa URANS/DES curvilinear and Cartesian grid solvers and calculations are performed using largest grids to date. Verification and validation study is performed for V4-DES solution for DTMB 5415 with bilge keels at 20 static drift using up to 250M grid. The instantaneous and mean flow field is analyzed to identify flow separation patterns, vortical...