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 6 are studied using an unsteady Reynolds-averaged Navier–Stokes (URANS) code with a blended k−ε/k−ω turbulence model and …
We propose a novel Clebsch method to simulate the free-surface vortical flow. At the center of our approach lies a level-set method enhanced by a wave-function correction scheme and a wave-function extrapolation algorithm to tackle the Clebsch method's numerical instabilities near a dynamic interface. By combining the Clebsch …
Abstract A long-standing challenge in dynamical oceanography is to distinguish nonlinearly intermingled dynamical regimes of oceanic flows. Conventional approaches focus on time-scale or space …
Filtration is a separation method used to separate out pure substances in mixtures comprised of particles—some of which are large enough in size to be captured with a porous material. Particle size can vary considerably, given the type of mixture. For instance, stream water is a mixture that contains naturally occurring biological organisms ...
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 1.52 106 are studied using an unsteady Reynolds-averaged Navier–Stokes (URANS) code with a blended k e/k o turbulence model and a free …
In order to investigate the flow structure and unsteady behavior of three-dimensional corner separation, a delayed detached-eddy simulation (DDES) method based on the Spalart–Allmaras (SA) model is performed on the third-stage stator of a multistage low-speed axial compressor. The stator simulation is validated by …
Downloadable! In order to investigate the flow structure and unsteady behavior of three-dimensional corner separation, a delayed detached-eddy simulation (DDES) method based on the Spalart–Allmaras (SA) model is performed on the third-stage stator of a multistage low-speed axial compressor. The stator simulation is validated by …
Label-free separation of viable cancer cells using vortical microfluidic flows has been introduced as a feasible cell collection method in oncological stud
Classification of coherent vortical structures and methods of their control in a boundary layer are developed depending on their intensity. The method of susceptibility …
Now the increasing attention is given researches to effective methods of drag reduction. It is revealed, that, in particular, in a boundary layer all power exchanges are caused by features of separate kinds of coherent vortical structures. The analysis is carried out and ordering of the basic types of the coherent vortical structures arising at …
This paper analyzes the vortex flow field and performance of a solid-gas cyclone separator using computational fluid dynamics (CFD) by employing the Reynolds stress turbulence model (RSM) and Eulerian-Lagrangian particle tracking scheme for particle diameter (d) range of 0.1 to 8 μm. The complex structure of vortices is analyzed …
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 ...
This paper discusses how coarse ore sorting and gravity separation could be employed underground in a narrow-vein scenario and details the test work that is required at the front-end of a project to see if this potential exists.
Vortex electromagnetic (EM) wave propagation in a magnetized plasma sheath is explored by incorporating the vector angular spectrum expansion technique into the generalized hybrid matrix method (GHMM). The generalized hybrid matrices tracing tangential field components and relating four eigenstates through the anisotropic …
In aero-engine compressors, corner separations cause blockage, loss generation, and flow instabilities. The aim of the current study is to gain better knowledge of the vortical structures in corner separation flows and their resultant blockage and loss. Numerical simulations at different incidences have been performed for a high-speed …
We study coefficients of axial chiral vortical effect and chiral separation effect at finite temperature and vector chemical potential in massive theories. We present two independent methods of calculating the coefficients: one from field theory and the other using the mass term in axial anomaly equation. An ambiguity in the integration constant …
Label-free separation of viable cancer cells using vortical microfluidic flows has been introduced as a feasible cell collection method in oncological studies. Besides the clinical importance, the physics of particle interactions with the vortex that forms in a wall-confined geometry of a microchann …
The phenomenon of horn-like vortex in stator corner separation flow in an axial flow pump was first reported by the authors (ASME-FE, 142(7): 071208), and the associated external features were ...
CFD Methods for Vortical Flows 4 documented flow structure present in transonic flow, is shown in Figure 5 and is characterised by: 1) a bow shock close to the tip of the nose, 2) expansion waves in the forebody region, 3) a crossflow shock wave that can develop, which fixes the primary separation point, and depending on the
The results of axial chiral vortical effect and chiral separation effect indicate that the presence of mass generically suppresses the two coefficients, with less suppression at larger chemical ...
Rotating separation flow (RSF) in hydraulic machinery is characterized by the large flow separations and complex vortical structures induced by the effects of strong rotation, large curvature and multiple wall surfaces, and conducting efficient engineering computation and putting forward effective control strategy for the RSF are important …
As illustrated in figure 16, the wave function extracts vortex lines and surfaces analytically, so the Clebsch method can preserve the vortical structure at long times in the flow simulation with lower grid resolution and computational cost than conventional CFD methods.
In aero-engine compressors, corner separations cause blockage, loss generation, and flow instabilities. The aim of the current study is to gain better …
In a narrow vein mining scenario, employing preconcentration technology underground not only results in reduced transport and handling costs but may allow alternative mining …
In this study, Convolutional Neural Network-based ML systems are built to recognize vortical structures and simple flow separation patterns and deployed to automatically identify & extract such features from 3D flowfields such as rotorcraft wakes. : The field of machine learning is broad, covering many different areas and applications. The …
Direct solutions of these equations are presently being developed, using realistic boundary conditions to represent aerodynamic configurations in flows with varying Mach numbers …
In this paper, a new visualization method for vortex structure is presented. Several widely used techniques for local vortex visualization in turbulent flows are reviewed and compared. Among these techniques, lambda2 and Q method are the most prominent and they are considered to be the best methods in visualizing vortical structures. …
Advance ratio changes the shape and trajectory of vortical structures. ... which confirmed the validity of the computational method employed in this work. Fourier analysis studies on integral variables showed that the rotation of the whole propeller determines the fluctuation of side forces at high J, while at low J, mostly rotation of ...
These components are then evolved using a hybrid particle-mesh method, enabling the effective reconstruction of three-dimensional tangential velocities and seamlessly integrating surfactant and thickness dynamics into a unified framework. By coupling with its normal component and surface-tension model, our method is particularly adept at ...
Magnetic separation- This is based on difference in magnetic properties of ore components . If either of the ore or the gangue (one of these two) is capable of being attracted by a magnetic field, then such separations are carried out.
