scholarly journals Giant negative mobility of inertial particles caused by the periodic potential in steady laminar flows

2018 ◽  
Vol 149 (16) ◽  
pp. 164903 ◽  
Author(s):  
Bao-quan Ai ◽  
Wei-jing Zhu ◽  
Ya-feng He ◽  
Wei-rong Zhong
Keyword(s):  
Periodic Potential ◽  
Laminar Flows ◽  
Inertial Particles ◽  
Steady Laminar

Adjoint sensitivity analysis of steady laminar flows with respect to non‐geometrical parameters

2020 ◽  
Author(s):  
Daiane Iglesia Dolci ◽  
João Sá Brasil Lima ◽  
Tomás Sambiase Privato ◽  
Bruno Souza Carmo ◽  
Ernani Vitillo Volpe
Keyword(s):  
Sensitivity Analysis ◽  
Laminar Flows ◽  
Geometrical Parameters ◽  
Adjoint Sensitivity Analysis ◽  
Adjoint Sensitivity ◽  
Steady Laminar

scholarly journals Planar flows past thin multi-blade configurations

1996 ◽  
Vol 324 ◽  
pp. 355-377 ◽  
Author(s):  
F. T. Smith ◽  
S. N. Timoshin
Keyword(s):  
Boundary Layer ◽  
Numerical Solutions ◽  
Reynolds Numbers ◽  
Laminar Flows ◽  
Two Dimensional ◽  
Boundary Layer Equations ◽  
Require Solution ◽  
Lift And Drag ◽  
Planar Flows ◽  
Steady Laminar

Two-dimensional steady laminar flows past multiple thin blades positioned in near or exact sequence are examined for large Reynolds numbers. Symmetric configurations require solution of the boundary-layer equations alone, in parabolic fashion, over the successive blades. Non-symmetric configurations in contrast yield a new global inner–outer interaction in which the boundary layers, the wakes and the potential flow outside have to be determined together, to satisfy pressure-continuity conditions along each successive gap or wake. A robust computational scheme is used to obtain numerical solutions in direct or design mode, followed by analysis. Among other extremes, many-blade analysis shows a double viscous structure downstream with two streamwise length scales operating there. Lift and drag are also considered. Another new global interaction is found further downstream. All the interactions involved seem peculiar to multi-blade flows.

Composite method for the mixing of two steady laminar flows

AIAA Journal ◽  
1991 ◽  
Vol 29 (2) ◽  
pp. 168-173 ◽  
Author(s):  
Anthony Demetriades
Keyword(s):  
Laminar Flows ◽  
Composite Method ◽  
Steady Laminar

scholarly journals Some observations regarding steady laminar flows past bluff bodies

2014 ◽  
Vol 372 (2020) ◽  
pp. 20130353 ◽  
Author(s):  
Bengt Fornberg ◽  
Alan R. Elcrat
Keyword(s):  
Numerical Methods ◽  
Flow Regimes ◽  
Reynolds Numbers ◽  
Laminar Flows ◽  
Bluff Bodies ◽  
The Past ◽  
High Reynolds Numbers ◽  
High Reynolds ◽  
Steady Laminar

Steady laminar flows past simple objects, such as a cylinder or a sphere, have been studied for well over a century. Theoretical, experimental and numerical methods have all contributed fundamentally towards our understanding of the resulting flows. This article focuses on developments during the past few decades, when mostly numerical and asymptotical advances have provided insights also for steady, although unstable, high-Reynolds-numbers flow regimes.

Steady Laminar Flows Between a Ball and a Spherical Cavity

1984 ◽  
Vol 51 (1) ◽  
pp. 6-12
Author(s):  
D. Bellet ◽  
D. P. Ly ◽  
M. Milleret
Keyword(s):  
Finite Element ◽  
Experimental Method ◽  
Newtonian Fluid ◽  
Spherical Cavity ◽  
Laser Doppler Anemometry ◽  
Reynolds Numbers ◽  
Laminar Flows ◽  
Element Calculation ◽  
Spherical Ball ◽  
Steady Laminar

Steady laminar flows of a newtonian fluid in the vicinity of a spherical ball located inside a spherical cavity are studied. Two methods were employed: a method involving a finite element calculation and an experimental method based on measurements of local velocities by means of laser Doppler anemometry using the Bragg cell. The influences of the Reynolds numbers and of the ball positions in the cavity have been analyzed and compared.

Steady Laminar Flows in Lower Half Heated Upper Half Cooled Rectangular and Cylindrical Enclosures: Comparison of the Transport Mechanism

Volume 4 ◽  
2004 ◽  
Author(s):  
Hongmin Li ◽  
Minel J. Braun ◽  
Edward A. Evans ◽  
G.-X. Wang
Keyword(s):  
Laminar Flows ◽  
Lower Half ◽  
Flow Structures ◽  
Transport Mechanisms ◽  
Hydrothermal Crystal Growth ◽  
Aspect Ratios ◽  
Parametric Studies ◽  
Stream Formation ◽  
Steady Laminar ◽  
Rectangular Model

Flows in enclosures have been studied for various applications. Transport in lower half heated upper half cooled enclosures becomes a focus of research recently due to its application on hydrothermal crystal growth. Natural convection flows in hydrothermal autoclaves are driven by the temperature differential on the enclosure walls; lower half hot and upper half cooled. Due to the difficulties associated with visualization of flow in cylindrical enclosures, flows were experimentally visualized in a rectangular model autoclave. In this study, flows and transport mechanisms in rectangular and cylindrical enclosures are studied numerically in the steady laminar flow regime. Flow structures and transport mechanisms are analyzed and compared. Parametric studies on aspect ratios are carried out for both enclosures. Results show that flows in rectangular and cylindrical enclosures have the same transports mechanism. Fluid in the wall layers in one half form streams that feed into the center of the other half. However, for two kinds of enclosures quantitative differences exist on the stream formation.

Transition Flow with an Incompressible Lattice Boltzmann Method

2017 ◽  
Vol 9 (5) ◽  
pp. 1271-1288 ◽  
Author(s):  
J. R. Murdock ◽  
J. C. Ickes ◽  
S. L. Yang
Keyword(s):  
Boltzmann Equation ◽  
Lattice Boltzmann ◽  
Flow Behavior ◽  
Transition Process ◽  
Laminar Flows ◽  
Lattice Boltzmann Equation ◽  
Transition Flow ◽  
Chaotic Flow ◽  
Kolmogorov Length Scale ◽  
Steady Laminar

AbstractDirect numerical simulations of the transition process from steady laminar to chaotic flow are considered in this study with the relatively new incompressible lattice Boltzmann equation. Numerically, a multiple relaxation time fully incompressible lattice Boltzmann equation is implemented in a 2D driven cavity. Spatial discretization is 2nd-order accurate, and the Kolmogorov length scale estimation based on Reynolds number (Re) dictates grid resolution. Initial simulations show the method to be accurate for steady laminar flows, while higher Re simulations reveal periodic flow behavior consistent with an initial Hopf bifurcation at Re 7,988. Non-repeating flow behavior is observed in the phase space trajectories above Re 13,063, and is evidence of the transition to a chaotic flow regime. Finally, flows at Reynolds numbers above the chaotic transition point are simulated and found with statistical properties in good agreement with literature.

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