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Artykuły w czasopismach na temat „Rotating Flow Simulations”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

GRUNDESTAM, OLOF, STEFAN WALLIN, and ARNE V. JOHANSSON. "Direct numerical simulations of rotating turbulent channel flow." Journal of Fluid Mechanics 598 (February 25, 2008): 177–99. http://dx.doi.org/10.1017/s0022112007000122.

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Fully developed rotating turbulent channel flow has been studied, through direct numerical simulations, for the complete range of rotation numbers for which the flow is turbulent. The present investigation suggests that complete flow laminarization occurs at a rotation number Ro = 2Ωδ/Ub ≤ 3.0, where Ω denotes the system rotation, Ub is the mean bulk velocity and δ is the half-width of the channel. Simulations were performed for ten different rotation numbers in the range 0.98 to 2.49 and complemented with earlier simulations (done in our group) for lower values of Ro. The friction Reynolds nu

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2

LI, WEI, ZHONGYONG PAN, and WEIDONG SHI. "NUMERICAL INVESTIGATION OF PUMP-TURBINES WITH DIFFERENT BLADES AT PUMP CONDITIONS." Journal of Advanced Manufacturing Systems 11, no. 02 (2012): 143–50. http://dx.doi.org/10.1142/s0219686712500138.

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The undesirable performance of a positive slope curve usually appears for pump-turbines running as pumps at a low flow rate. The inner flow feature of pump-turbines with 6- and 7-blades runner is studied by both steady and unsteady simulations at pump conditions. According to the steady simulation investigation, obviously back flow vortex is found in the runner passage at the low flow rate zone where the positive slope curve forms. The flow rate at which the instable flow pattern happens of 6-blades runner is smaller than that of 7-blades one. By the unsteady simulation, at the low flow rate z

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3

Kimmel-Klotzkin, Shari J., and Fadi P. Deek. "Large Eddy Simulation of Rotating Finite Source Convection." Journal of Applied Mechanics 73, no. 1 (2005): 79–87. http://dx.doi.org/10.1115/1.1991859.

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Numerical simulations of turbulent convection under the influence of rotation will help understand mixing in oceanic flows. Though direct numerical simulations (DNS) can accurately model rotating convective flows, this method is limited to small scale and low speed flows. A large eddy simulation (LES) with the Smagorinsky subgrid scale model is used to compute the time evolution of a rotating convection flow generated by a buoyancy source of finite size at a relatively high Rayleigh number. Large eddy simulations with eddy viscosity models have been used successfully for other rotating convect

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4

Kang, Changwoo, Kyung-Soo Yang, and Innocent Mutabazi. "Thermal effect on large-aspect-ratio Couette–Taylor system: numerical simulations." Journal of Fluid Mechanics 771 (April 14, 2015): 57–78. http://dx.doi.org/10.1017/jfm.2015.151.

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We have performed numerical simulations of the flow in a large-aspect-ratio Couette–Taylor system with rotating inner cylinder and with a radial temperature gradient. The aspect ratio was chosen in such a way that the base state is in the conduction regime. Away from the endplates, the base flow is a superposition of an azimuthal flow induced by rotation and an axial flow (large convective cell) induced by the temperature gradient. For a fixed rotation rate of the inner cylinder in the subcritical laminar regime, the increase of the temperature difference imposed on the annulus destabilizes th

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5

Kristoffersen, Reidar, and Helge I. Andersson. "Direct simulations of low-Reynolds-number turbulent flow in a rotating channel." Journal of Fluid Mechanics 256 (November 1993): 163–97. http://dx.doi.org/10.1017/s0022112093002757.

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Direct numerical simulations of fully developed pressure-driven turbulent flow in a rotating channel have been performed. The unsteady Navier–Stokes equations were written for flow in a constantly rotating frame of reference and solved numerically by means of a finite-difference technique on a 128 × 128 × 128 computational mesh. The Reynolds number, based on the bulk mean velocity Um and the channel half-width h, was about 2900, while the rotation number Ro = 2|Ω|h/Um varied from 0 to 0.5. Without system rotation, results of the simulation were in good agreement with the accurate reference sim

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6

Alexakis, A. "Rotating Taylor–Green flow." Journal of Fluid Mechanics 769 (March 13, 2015): 46–78. http://dx.doi.org/10.1017/jfm.2015.82.

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The steady state of a forced Taylor–Green flow is investigated in a rotating frame of reference. The investigation involves the results of 184 numerical simulations for different Reynolds numbers $\mathit{Re}_{F}$ and Rossby numbers $\mathit{Ro}_{F}$. The large number of examined runs allows a systematic study that enables the mapping of the different behaviours observed to the parameter space ($\mathit{Re}_{F},\mathit{Ro}_{F}$), and the examination of different limiting procedures for approaching the large $\mathit{Re}_{F}$ small $\mathit{Ro}_{F}$ limit. Four distinctly different states were

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7

Schulmeister, James C., J. M. Dahl, G. D. Weymouth, and M. S. Triantafyllou. "Flow control with rotating cylinders." Journal of Fluid Mechanics 825 (July 21, 2017): 743–63. http://dx.doi.org/10.1017/jfm.2017.395.

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We study the use of small counter-rotating cylinders to control the streaming flow past a larger main cylinder for drag reduction. In a water tunnel experiment at a Reynolds number of 47 000 with a three-dimensional and turbulent wake, particle image velocimetry (PIV) measurements show that rotating cylinders narrow the mean wake and shorten the recirculation length. The drag of the main cylinder was measured to reduce by up to 45 %. To examine the physical mechanism of the flow control in detail, a series of two-dimensional numerical simulations at a Reynolds number equal to 500 were conducte

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8

Bartello, Peter, Olivier Métais, and Marcel Lesieur. "Coherent structures in rotating three-dimensional turbulence." Journal of Fluid Mechanics 273 (August 25, 1994): 1–29. http://dx.doi.org/10.1017/s0022112094001837.

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Numerical simulations investigating the formation and stability of quasi-two-dimensional coherent vortices in rotating homogeneous three-dimensional flow are described. In a numerical study of shear flows Lesieur, Yanase & Métais (1991) found that cyclones (respectively anticyclones) with |ω2D| ∼ O(2Ω), where ω2D is the vorticity and Ω is the rotation rate, are stabilized (respectively destabilized) by the rotation. A study of triply periodic pseudo-spectral simulations (643) was undertaken in order to investigate the vorticity asymmetry in homogeneous turbulence. Specifically, we examine

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9

Bech, Knut H., and Helge I. Andersson. "Secondary flow in weakly rotating turbulent plane Couette flow." Journal of Fluid Mechanics 317 (June 25, 1996): 195–214. http://dx.doi.org/10.1017/s0022112096000729.

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As in the laminar case, the turbulent plane Couette flow is unstable (stable) with respect to roll cell instabilities when the weak background angular velocity Ωk is antiparallel (parallel) to the spanwise mean flow vorticity (-dU/dy)k. The critical value of the rotation number Ro, based on 2Ω and dU/dy of the corresponding laminar flow, was estimated as 0.0002 at a low Reynolds number with fully developed turbulence. Direct numerical simulations were performed for Ro = ±0.01 and compared with earlier results for non-rotating Couette flow. At the low rotation rates considered, both senses of r

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10

ORLANDI, P., and M. FATICA. "Direct simulations of turbulent flow in a pipe rotating about its axis." Journal of Fluid Mechanics 343 (July 25, 1997): 43–72. http://dx.doi.org/10.1017/s0022112097005715.

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Flow in a circular pipe rotating about its axis, at low Reynolds number, is investigated. The simulation is performed by a finite difference scheme, second-order accurate in space and in time. A non-uniform grid in the radial direction yields accurate solutions with a reasonable number of grid points. The numerical method has been tested for the non-rotating pipe in the limit ν→0 to prove the energy conservation properties. In the viscous case a grid refinement check has been performed and some conclusions about drag reduction have been reached. The mean and turbulent quantities have been comp

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11

Castro, Nicolas D., and Ayodeji O. Demuren. "Large eddy simulation of turbulent axially rotating pipe and swirling jet flows." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 9 (2015): 1749–61. http://dx.doi.org/10.1177/0954406215620823.

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Fully-developed, turbulent rotating pipe flow and swirling jet flow, emitted from the pipe, into open quiescent ambient are investigated numerically using large eddy simulation. Simulations are performed at various rotation rates and Reynolds numbers. Time-averaged large eddy simulation results are compared to experimental and simulation data from previous studies. Pipe flow results show deformation of the turbulent mean axial velocity profile towards the laminar-type Poiseuille profile, with increased rotation. The Reynolds stress anisotropy tensor experiences a component-level redistribution

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12

Ostilla, Rodolfo, Richard J. A. M. Stevens, Siegfried Grossmann, Roberto Verzicco, and Detlef Lohse. "Optimal Taylor–Couette flow: direct numerical simulations." Journal of Fluid Mechanics 719 (February 19, 2013): 14–46. http://dx.doi.org/10.1017/jfm.2012.596.

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AbstractWe numerically simulate turbulent Taylor–Couette flow for independently rotating inner and outer cylinders, focusing on the analogy with turbulent Rayleigh–Bénard flow. Reynolds numbers of $R{e}_{i} = 8\times 1{0}^{3} $ and $R{e}_{o} = \pm 4\times 1{0}^{3} $ of the inner and outer cylinders, respectively, are reached, corresponding to Taylor numbers $Ta$ up to $1{0}^{8} $. Effective scaling laws for the torque and other system responses are found. Recent experiments with the Twente Turbulent Taylor–Couette (${T}^{3} C$) setup and with a similar facility in Maryland at very high Reynold

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13

Jiao, Z., S. Fu, T. Kawakubo, S. Ohuchida, and H. Tamaki. "Analysis of a Rotating Disk System with Axial Cooling Air." Journal of Mechanics 34, no. 2 (2017): 217–29. http://dx.doi.org/10.1017/jmech.2017.58.

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AbstractIn this article, a series of simulations of a rotating disk system with air cooling is introduced. These simulations are performed with the realizable k-ε eddy-viscosity model. Computational results illustrate the effect of the cooling air and disk rotation on the temperature of the disk surface. The maximum rotating disk speed reaches about 78300 rpm and the range of Reynolds numbers based on rotation speed is from about 0.7 × 106 to 3 × 106. The present work shows that the flow structure in the gap, which is on the opposite side of the cooling air, is rather similar to different cool

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14

Griton, L., and F. Pantellini. "Magnetohydrodynamic simulations of a Uranus-at-equinox type rotating magnetosphere." Astronomy & Astrophysics 633 (January 2020): A87. http://dx.doi.org/10.1051/0004-6361/201936604.

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Context. As proven by measurements at Uranus and Neptune, the magnetic dipole axis and planetary spin axis can be off by a large angle exceeding 45°. The magnetosphere of such an (exo-)planet is highly variable over a one-day period and it does potentially exhibit a complex magnetic tail structure. The dynamics and shape of rotating magnetospheres do obviously depend on the planet’s characteristics but also, and very substantially, on the orientation of the planetary spin axis with respect to the impinging, generally highly supersonic, stellar wind. Aims. On its orbit around the Sun, the orien

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15

MITTAL, SANJAY, and BHASKAR KUMAR. "Flow past a rotating cylinder." Journal of Fluid Mechanics 476 (February 10, 2003): 303–34. http://dx.doi.org/10.1017/s0022112002002938.

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Flow past a spinning circular cylinder placed in a uniform stream is investigated via two-dimensional computations. A stabilized finite element method is utilized to solve the incompressible Navier–Stokes equations in the primitive variables formulation. The Reynolds number based on the cylinder diameter and free-stream speed of the flow is 200. The non-dimensional rotation rate, α (ratio of the surface speed and freestream speed), is varied between 0 and 5. The time integration of the flow equations is carried out for very large dimensionless time. Vortex shedding is observed for α < 1.91.

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16

Santos, D. A., Irineu Petri Jr., C. R. Duarte, and M. A. S. Barrozo. "An Investigation of the Different Flow Regimes in a Rotating Drum through Experimental and Simulation." Materials Science Forum 802 (December 2014): 215–19. http://dx.doi.org/10.4028/www.scientific.net/msf.802.215.

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This paper aims to investigate the particle dynamic behavior in a rotating drum operating in a rolling regime under different rotating velocity, based on experimental results and simulations. Simple superphosphate fertilizer (SSP) was used as particulate matter in the current study. The Eulerian–Eulerian multiphase model along with the kinetic theory of granular flow was used in the simulations. In order to evaluate the simulation results, velocity distributions of the particulate phase were compared with experimental data. The experimental particle velocity distribution was obtained by using

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17

Yu, Jia-Jia, Lu Zhang, Ting Shen, Li Zhang, and You-Rong Li. "Numerical Simulation of Thermal-Solutal Capillary-Buoyancy Flow of Ge1–xSix Single Crystals Driven by Surface-Tension and Rotation in a Czochralski Configuration." Crystals 9, no. 4 (2019): 217. http://dx.doi.org/10.3390/cryst9040217.

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A series of three-dimensional numerical simulations were performed to understand the thermal-solutal capillary-buoyancy flow of Ge1-xSix melts during Czochralski crystal growth with a rotating crystal or crucible. The crystal and crucible rotation Reynolds numbers in this work are 0∼3.5 × 103 (0∼4.4 rpm) and 0∼−2.4 × 103 (0∼−1.5 rpm), respectively. Simulation results show that if the thermal capillary Reynolds number is relatively low, the flow will be steady and axisymmetric, even though the crystal or crucible rotates at a constant rate. The critical thermal capillary Reynolds number for the

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18

Mitruţ, R., D. M. Bucur, G. Dunca, and M. J. Cervantes. "Global linear stability analysis of the flow inside a conical draft tube." IOP Conference Series: Earth and Environmental Science 1079, no. 1 (2022): 012049. http://dx.doi.org/10.1088/1755-1315/1079/1/012049.

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Abstract The paper presents the numerical simulations of the flow inside the draft tube of Francis-99 turbine at the part load (PL) operating condition. The rotating vortex rope (RVR) is a phenomenon that occurs during the PL operating regime inside the draft tube of hydraulic turbines. To reduce the computational cost, the numerical simulations are carried out in two steps. Firstly, steady state numerical simulations are performed in a reduced geometry of the runner which is made of a runner passage and part of the draft tube. The velocity profiles from the steady state simulation are used as

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19

Bourguet, Rémi, and David Lo Jacono. "Flow-induced vibrations of a rotating cylinder." Journal of Fluid Mechanics 740 (February 6, 2014): 342–80. http://dx.doi.org/10.1017/jfm.2013.665.

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AbstractThe flow-induced vibrations of a circular cylinder, free to oscillate in the cross-flow direction and subjected to a forced rotation about its axis, are analysed by means of two- and three-dimensional numerical simulations. The impact of the symmetry breaking caused by the forced rotation on the vortex-induced vibration (VIV) mechanisms is investigated for a Reynolds number equal to $100$, based on the cylinder diameter and inflow velocity. The cylinder is found to oscillate freely up to a rotation rate (ratio between the cylinder surface and inflow velocities) close to $4$. Under forc

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20

Métais, Olivier, Carlos Flores, Shinichiro Yanase, James J. Riley, and Marcel Lesieur. "Rotating free-shear flows. Part 2. Numerical simulations." Journal of Fluid Mechanics 293 (June 25, 1995): 47–80. http://dx.doi.org/10.1017/s0022112095001637.

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The three-dimensional dynamics of the coherent vortices in periodic planar mixing layers and in wakes subjected to solid-body rotation of axis parallel to the basic vorticity are investigated through direct (DNS) and large-eddy simulations (LES). Initially, the flow is forced by a weak random perturbation superposed on the basic shear, the perturbation being either quasi-two-dimensional (forced transition) or three-dimensional (natural transition). For an initial Rossby number Ro(i), based on the vorticity at the inflexion point, of small modulus, the effect of rotation is to always make the f

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21

Citro, V., J. Tchoufag, D. Fabre, F. Giannetti, and P. Luchini. "Linear stability and weakly nonlinear analysis of the flow past rotating spheres." Journal of Fluid Mechanics 807 (October 18, 2016): 62–86. http://dx.doi.org/10.1017/jfm.2016.596.

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We study the flow past a sphere rotating in the transverse direction with respect to the incoming uniform flow, and particularly consider the stability features of the wake as a function of the Reynolds number $Re$ and the sphere dimensionless rotation rate $\unicode[STIX]{x1D6FA}$. Direct numerical simulations and three-dimensional global stability analyses are performed in the ranges $150\leqslant \mathit{Re}\leqslant 300$ and $0\leqslant \unicode[STIX]{x1D6FA}\leqslant 1.2$. We first describe the base flow, computed as the steady solution of the Navier–Stokes equation, with special attentio

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22

Erne, Sandro, Gernot Edinger, Anton Maly, and Christian Bauer. "Simulation and Experimental Investigation of the Stay Vane Channel Flow in a Reversible Pump Turbine at Off-Design Conditions." Periodica Polytechnica Mechanical Engineering 61, no. 2 (2017): 94. http://dx.doi.org/10.3311/ppme.9345.

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This work presents the assessment of the mean flow field and low frequency disturbances in the stay vane channel of a model pump turbine using transient numerical simulations and LDV-based measurements. The focus is laid on transient CFD simulations of characteristic flow states in the stay vane channel when operating at off-design conditions in pump mode. Experimental and numerical investigations obtained a shifting velocity distribution between the shroud and hub of the distributor when continuously increasing the discharge in the part-load range. Simulations captured the occurrence of this

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23

McDermott, B. R., and P. A. Davidson. "A physical conjecture for the dipolar–multipolar dynamo transition." Journal of Fluid Mechanics 874 (July 15, 2019): 995–1020. http://dx.doi.org/10.1017/jfm.2019.495.

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In numerical simulations of planetary dynamos there is an abrupt transition in the dynamics of both the velocity and magnetic fields at a ‘local’ Rossby number of 0.1. For smaller Rossby numbers there are helical columnar structures aligned with the rotation axis, which efficiently maintain a dipolar field. However, when the thermal forcing is increased, these columns break down and the field becomes multi-polar. Similarly, in rotating turbulence experiments and simulations there is a sharp transition at a Rossby number of ${\sim}0.4$. Again, helical axial columnar structures are found for low

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24

MARSTORP, LINUS, GEERT BRETHOUWER, OLOF GRUNDESTAM, and ARNE V. JOHANSSON. "Explicit algebraic subgrid stress models with application to rotating channel flow." Journal of Fluid Mechanics 639 (October 12, 2009): 403–32. http://dx.doi.org/10.1017/s0022112009991054.

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New explicit subgrid stress models are proposed involving the strain rate and rotation rate tensor, which can account for rotation in a natural way. The new models are based on the same methodology that leads to the explicit algebraic Reynolds stress model formulation for Reynolds-averaged Navier–Stokes simulations. One dynamic model and one non-dynamic model are proposed. The non-dynamic model represents a computationally efficient subgrid scale (SGS) stress model, whereas the dynamic model is the most accurate. The models are validated through large eddy simulations (LESs) of spanwise and st

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25

Chaouat, Bruno. "Simulations of Channel Flows With Effects of Spanwise Rotation or Wall Injection Using a Reynolds Stress Model." Journal of Fluids Engineering 123, no. 1 (2000): 2–10. http://dx.doi.org/10.1115/1.1343109.

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Simulations of channel flows with effects of spanwise rotation and wall injection are performed using a Reynolds stress model. In this work, the turbulent model is extended for compressible flows and modified for rotation and permeable walls with fluid injection. Comparisons with direct numerical simulations or experimental data are discussed in detail for each simulation. For rotating channel flows, the second-order turbulence model yields an asymmetric mean velocity profile as well as turbulent stresses quite close to DNS data. Effects of spanwise rotation near the cyclonic and anticyclonic

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RAHMATI, M. T. "APPLICATION OF A PRESSURE CORRECTION METHOD FOR MODELING INCOMPRESSIBLE FLOW THROUGH TURBOMACHINES." International Journal of Computational Methods 06, no. 03 (2009): 399–411. http://dx.doi.org/10.1142/s0219876209001905.

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This article presents the application of a RANS algorithm based on a pressure correction method for incompressible flow simulations of low-speed rotating machines. A numerical scheme is developed by extending a flow analysis in a stationary frame to a rotating frame for turbomachinery applications. The numerical scheme is explained with emphasis on the effect of rotation on the flow fields and turbulence modeling. The results of the numerical calculations for flow through an enclosed turbomachine and an extended turbomachine are compared with the experimental data to judge them on realistic fl

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Jian, Yu. "Numerical Study of Single-Mode Interface Shape on Rotary Motion Instability." Applied Mechanics and Materials 670-671 (October 2014): 774–78. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.774.

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Using the method of numerical simulations to study fluid dynamic characteristic of underwater vehicle rotary motion, using the N-S equation turbulence model description of the steady rotation of the vehicle, this paper studies the numerical calculation method of aircraft rotating derivative underwater, using UDF programming to produce a stable pressure rotation the flow field, set up an numerical turning basin. Then based on the simulation analysis the influence of the different radius of gyration and different angle of attack on the vehicle motion.

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Lee, Joon Sang, Xiaofeng Xu, and Richard H Pletcher. "Effects of Wall Rotation on Heat Transfer to Annular Turbulent Flow: Outer Wall Rotating." Journal of Heat Transfer 127, no. 8 (2004): 830–38. http://dx.doi.org/10.1115/1.1929788.

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Abstract Simulations were conducted for air flowing upward in a vertical annular pipe with a rotating outer wall. Simulations concentrated on the occurrence of laminarization and property variations for high heat flux heat transfer. The compressible filtered Navier-Stokes equations were solved using a second-order accurate finite volume method. Low Mach number preconditioning was used to enable the compressible code to work efficiently at low Mach numbers. A dynamic subgrid-scale stress model accounted for the subgrid-scale turbulence. When the outer wall rotated, a significant reduction of tu

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Bryngelson, Spencer H., and Jonathan B. Freund. "Floquet stability analysis of capsules in viscous shear flow." Journal of Fluid Mechanics 852 (August 13, 2018): 663–77. http://dx.doi.org/10.1017/jfm.2018.574.

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Observations in experiments and simulations show that the kinematic behaviour of an elastic capsule, suspended and rotating in shear flow, depends upon the flow strength, the capsule membrane material properties and its at-rest shape. We develop a linear stability description of the periodically rotating base state of this coupled system, as represented by a boundary integral flow formulation with spherical harmonic basis functions describing the elastic capsule geometry. This yields Floquet multipliers that classify the stability of the capsule motion for elastic capillary numbers $Ca$ rangin

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Cao, Liu Shuai, Jun Zhu, and Guang Hui Zeng. "Numerical Simulation of Oblique Towing Tests and Rotating Arm Tests for a Submarine Model in Same Grid Topology." Advanced Materials Research 1083 (January 2015): 190–96. http://dx.doi.org/10.4028/www.scientific.net/amr.1083.190.

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The numerical simulation of oblique towing tests (OTT) and rotating arm tests (RAT) for a submarine model was undertaken with the same grid topology. As for the OTT simulation, to improve the efficiency and accuracy of the computation, the drift sweep procedure was adopted. In contrast with the steady drift case, rotating motion for a submarine is more complex. The rotating reference frame was adopted to deal with the rotation problem. The Coriolis force and centrifugal force due to the computation in a body-fixed rotating coordinate system were treated explicitly and added to the momentum equ

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Wang, Guoqian, Shan Jiang, Shoudong Ni, and Yan Zhang. "Study of Mass Transfer Enhancement of Electrolyte Flow Field by Rotating Cathode in Through-Mask Electrochemical Micromachining." Micromachines 14, no. 7 (2023): 1398. http://dx.doi.org/10.3390/mi14071398.

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To solve the problem of the nonuniform distribution of temperature and electrolytic products in the electrolyte flow field during through-mask electrochemical micromachining, the use of a rotating cathode with surface structures is proposed. The rotation of the cathode increases the efficiency of heat and mass transfer by the electrolyte flow. Simulations are performed to analyze the influence of the type of surface structure, the number of surface structures, and the rotational speed of the cathode on the electrolyte flow field. The results show that the use of a rotating cathode with surface

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Luan, Zhaogao, and M. M. Khonsari. "Numerical Simulations of the Flow Field Around the Rings of Mechanical Seals." Journal of Tribology 128, no. 3 (2006): 559–65. http://dx.doi.org/10.1115/1.2197845.

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The flow inside a seal chamber as induced by the influx of the flush fluid and the rotation of the primary ring is analyzed. The 3-D flow characteristic around the mating ring and the rotating ring are predicted by solving the Navier-Stokes equations in cylindrical coordinates. For this purpose, the pressure correction method was used in conjunction with the SIMPLE algorithm. A series of numerical solutions is presented that show the flow mechanism within the gap between the rings and the gland. The implication of the flow characteristic on the cooling of the rings is discussed.

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Cheng, Tan, Hui Chen, and Qingsong Wei. "The Role of Roller Rotation Pattern in the Spreading Process of Polymer/Short-Fiber Composite Powder in Selective Laser Sintering." Polymers 14, no. 12 (2022): 2345. http://dx.doi.org/10.3390/polym14122345.

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In this study, for the first time, a forward-rotating roller is proposed for the spreading of CF/PA12 composite powder in the selective laser sintering (SLS) process. The mesoscopic kinetic mechanism of composite particle spreading is investigated by utilizing the “multi-spherical” element within the discrete element method (DEM). The commercial software EDEM and the open-source DEM particle simulation code LIGGGHTS-PUBLIC are used for the simulations in this work. It is found that the forward-rotating roller produces a strong compaction on the powder pile than does the conventional counter-ro

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Warneford, Emma S., and Paul J. Dellar. "Super- and sub-rotating equatorial jets in shallow water models of Jovian atmospheres: Newtonian cooling versus Rayleigh friction." Journal of Fluid Mechanics 822 (June 7, 2017): 484–511. http://dx.doi.org/10.1017/jfm.2017.232.

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Numerical simulations of the shallow water equations on rotating spheres produce mixtures of robust vortices and alternating zonal jets, as seen in the atmospheres of the gas giant planets. However, simulations that include Rayleigh friction invariably produce a sub-rotating (retrograde) equatorial jet for Jovian parameter regimes, whilst observations of Jupiter show a super-rotating (prograde) equatorial jet that has persisted over several decades. Super-rotating equatorial jets have recently been obtained in shallow water simulations that include a Newtonian relaxation of perturbations to th

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35

Clarke, Chris, Russell Marechale, Abraham Engeda, and Michael Cave. "Geometric considerations in the capture of localized flow reversal in centrifugal compressor vaneless diffusers using steady state simulations." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 21 (2016): 3959–73. http://dx.doi.org/10.1177/0954406216656213.

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A steady state simulation procedure is proposed to capture localized flow reversal inside of a centrifugal compressor vaneless diffuser. The procedure was performed on 12 compressor stages of varying geometry for speed lines of 13,100, 19,240, and 21,870 r/min. The simulations were run for all points from choke to surge including the experimentally determined rotating stall onset point. The experimental data and geometry were provided by Solar Turbines Inc. San Diego, CA. It was found possible to capture localized flow reversal inside of a vaneless diffuser using a steady state simulation. The

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36

Tsuzuki, Satori. "Numerical model of the Gross–Pitaevskii equation for rotating Bose–Einstein condensates using smoothed-particle hydrodynamics." Physics of Fluids 35, no. 4 (2023): 047102. http://dx.doi.org/10.1063/5.0143556.

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This study proposed a new numerical scheme for vortex lattice formation in a rotating Bose–Einstein condensate (BEC) using smoothed particle hydrodynamics (SPH) with an explicit real-time integration scheme. Specifically, the Gross–Pitaevskii equation was described as a complex representation to obtain a pair of time-dependent equations, which were then solved simultaneously following discretization based on SPH particle approximation. We adopt the fourth-order Runge–Kutta method for time evolution. We performed simulations of a rotating Bose gas trapped in a harmonic potential, showing result

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37

Suchecki, Witold. "Analysis of the Liquid Flow in a Vessel with a Rotating Disk at the Liquid Surface." Chemical and Process Engineering 35, no. 1 (2014): 3–18. http://dx.doi.org/10.2478/cpe-2014-0001.

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Abstract This study is concerned with liquid flow induced by a disk which rotates steadily around its axis and touches the free surface of liquid contained in a cylindrical vessel. It is a simplified model of the flow in the inlet part of a vertical cooling crystallizer where a rotary distributor of inflowing solution is situated above the free surface of solution contained in the crystalliser. Numerical simulations of flow phenomena were conducted and the simulation results were interpreted assuming an analogy with Kármán’s theoretical equations. In a cylindrical coordinate system, the compon

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Seshasayanan, Kannabiran, and Alexandros Alexakis. "Condensates in rotating turbulent flows." Journal of Fluid Mechanics 841 (February 23, 2018): 434–62. http://dx.doi.org/10.1017/jfm.2018.106.

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Using a large number of numerical simulations we examine the steady state of rotating turbulent flows in triple periodic domains, varying the Rossby number $Ro$ (that measures the inverse rotation rate) and the Reynolds number $Re$ (that measures the strength of turbulence). The examined flows are sustained by either a helical or a non-helical Roberts force, that is invariant along the axis of rotation. The forcing acts at a wavenumber $k_{f}$ such that $k_{f}L=4$, where $2\unicode[STIX]{x03C0}L$ is the size of the domain. Different flow behaviours were obtained as the parameters are varied. A

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39

Zhuang, Suguo, Haifeng Bao, Zhoufeng He, Kai Wang, and Houlin Liu. "The Influence of Rotating Speed on the Sealing Characteristics of a Liquid-Sealing Impeller for a Liquid Oxygen Turbopump." Processes 10, no. 7 (2022): 1366. http://dx.doi.org/10.3390/pr10071366.

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In order to explore the influence of rotating speed on the internal flow and sealing characteristics of the liquid-sealing impeller for a liquid oxygen turbopump of a rocket engine, unsteady numerical simulations of the flow characteristics and sealing performance of the first-stage liquid-sealing impeller for a liquid oxygen turbopump under liquid phase conditions were performed. The results show that the pressurization value increases with the increase in the rotating speed. The first-stage liquid-sealing impeller, whose structure is symmetrically distributed along the center of the rotation

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40

CARNEVALE, G. F., R. C. KLOOSTERZIEL, P. ORLANDI, and D. D. J. A. van SOMMEREN. "Predicting the aftermath of vortex breakup in rotating flow." Journal of Fluid Mechanics 669 (January 11, 2011): 90–119. http://dx.doi.org/10.1017/s0022112010004945.

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A method for predicting the outcome of vortex breakup in a rotating flow is introduced. The vortices dealt with here are subject to both centrifugal and barotropic instabilities. The prediction of the aftermath of the breakup relies on knowing how both centrifugal and barotropic instabilities would equilibrate separately. A theoretical model for non-linear equilibration in centrifugal instability is wedded to two-dimensional simulation of barotropic instability to predict the final vortices that emerge from the debris of the original vortex. This prediction method is tested against three-dimen

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41

Herrada, Miguel A., Vladimir N. Shtern, and M. M. Torregrosa. "The instability nature of the Vogel–Escudier flow." Journal of Fluid Mechanics 766 (February 9, 2015): 590–610. http://dx.doi.org/10.1017/jfm.2015.34.

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AbstractThe instability of the steady axisymmetric flow in a sealed elongated cylinder, driven by a rotating end disk, is studied with the help of numerical simulations. It is argued that this instability is of the shear-layer type, being caused by the presence of an inflection point in the radial distribution of axial velocity of the base circulatory flow. The disturbance kinetic energy is localized in both the radial and axial directions, reaching its peak near the rotating disk, where the magnitude of base-flow axial velocity is close to its maximum. The critical Reynolds number, $\mathit{R

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42

Cuthbertson, A., J. Berntsen, J. Laanearu, and Magdeli Asplin. "Rotational effects on exchange flows across a submerged sill." Environmental Fluid Mechanics 21, no. 2 (2021): 405–32. http://dx.doi.org/10.1007/s10652-021-09779-5.

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AbstractThis paper presents new laboratory-scale numerical simulations of density-driven exchange flows generated across an idealised, submerged sill obstruction under both non-rotating and rotating frames of reference using the Bergen Ocean Model (BOM), a three-dimensional general ocean circulation model. Initial non-rotating BOM simulations are compared directly with previous laboratory data obtained in a large-scale channel facility incorporating an idealised trapezoidal sill. These laboratory experiments demonstrate that the saline intrusion flux across the sill is initially reduced and th

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Zeng, Chongji, Yexiang Xiao, Zhengwei Wang, Jin Zhang, and Yongyao Luo. "Numerical analysis of a Pelton bucket free surface sheet flow and dynamic performance affected by operating head." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 231, no. 3 (2017): 182–96. http://dx.doi.org/10.1177/0957650916689507.

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The present paper aims to find out the influence of operating head on the rotating bucket free surface sheet flow and hydrodynamics performance for a Pelton turbine. Three-dimensional unsteady air-water two-phase flow simulations in the rotating buckets were performed by adopting the shear stress transport curvature correction turbulence model and homogenous model. The sensitivities of the unsteady simulation results to moving mesh resolution and computational fluid dynamics solver time-step have been evaluated to discuss the effect of Courant–Friedrichs–Lewy conditions on the two-phase flow s

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44

Appelquist, E., P. Schlatter, P. H. Alfredsson, and R. J. Lingwood. "Global linear instability of the rotating-disk flow investigated through simulations." Journal of Fluid Mechanics 765 (January 30, 2015): 612–31. http://dx.doi.org/10.1017/jfm.2015.2.

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AbstractNumerical simulations of the flow developing on the surface of a rotating disk are presented based on the linearized incompressible Navier–Stokes equations. The boundary-layer flow is perturbed by an impulsive disturbance within a linear global framework, and the effect of downstream turbulence is modelled by a damping region further downstream. In addition to the outward-travelling modes, inward-travelling disturbances excited at the radial end of the simulated linear region, $r_{end}$, by the modelled turbulence are included within the simulations, potentially allowing absolute insta

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45

Brauckmann, Hannes J., Matthew Salewski, and Bruno Eckhardt. "Momentum transport in Taylor–Couette flow with vanishing curvature." Journal of Fluid Mechanics 790 (February 4, 2016): 419–52. http://dx.doi.org/10.1017/jfm.2015.737.

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We numerically study turbulent Taylor–Couette flow (TCF) between two independently rotating cylinders and the transition to rotating plane Couette flow (RPCF) in the limit of infinite radii. By using the shear Reynolds number$Re_{S}$and rotation number$R_{{\it\Omega}}$as dimensionless parameters, the transition from TCF to RPCF can be studied continuously without singularities. Already for radius ratios${\it\eta}\geqslant 0.9$we find that the simulation results for various radius ratios and for RPCF collapse as a function of$R_{{\it\Omega}}$, indicating a turbulent behaviour common to both sys

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46

Ostilla-Mónico, Rodolfo, Erwin P. van der Poel, Roberto Verzicco, Siegfried Grossmann, and Detlef Lohse. "Exploring the phase diagram of fully turbulent Taylor–Couette flow." Journal of Fluid Mechanics 761 (November 18, 2014): 1–26. http://dx.doi.org/10.1017/jfm.2014.618.

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AbstractDirect numerical simulations of Taylor–Couette flow, i.e. the flow between two coaxial and independently rotating cylinders, were performed. Shear Reynolds numbers of up to $3\times 10^{5}$, corresponding to Taylor numbers of $\mathit{Ta}=4.6\times 10^{10}$, were reached. Effective scaling laws for the torque are presented. The transition to the ultimate regime, in which asymptotic scaling laws (with logarithmic corrections) for the torque are expected to hold up to arbitrarily high driving, is analysed for different radius ratios, different aspect ratios and different rotation ratios.

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47

García-Villalba, M., J. Fröhlich, and W. Rodi. "Numerical Simulations of Isothermal Flow in a Swirl Burner." Journal of Engineering for Gas Turbines and Power 129, no. 2 (2006): 377–86. http://dx.doi.org/10.1115/1.2364198.

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In this paper, the non-reacting flow in a swirl burner is studied using large eddy simulation. The configuration consists of two unconfined coannular jets at a Reynolds number of 81,500. The flow is characterized by a Swirl number of 0.93. Two cases are studied in the paper differing with respect to the axial location of the inner pilot jet. It was observed in a companion experiment (Bender and Büchner, 2005, Proc. 12 Int. Cong. Sound and Vibration, Lisbon, Portugal) that when the inner jet is retracted the flow oscillations are considerably amplified. This is also found in the present simulat

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Zhao, Xiaoran, Zhengwei Wang, Yexiang Xiao, and Yongyao Luo. "Thermodynamic analysis of energy dissipation and unsteady flow characteristic in a centrifugal dredge pump under over-load conditions." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 13 (2019): 4742–53. http://dx.doi.org/10.1177/0954406218824350.

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The present paper aims to investigate the energy dissipation related to unsteady flow phenomena inside a three-bladed impeller of a centrifugal dredge pump under over-load operating conditions. Three-dimensional unsteady numerical simulations of the centrifugal pump are performed by adopting the SAS SST-curvature correction turbulence model with the total energy equation. The simulating results are verified by comparing the performance results and pressure fluctuation with available experimental data. The unsteady flow patterns and energy dissipation in the rotating impeller are analysed by en

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Carone, Ludmila, Robin Baeyens, Paul Mollière, et al. "Equatorial retrograde flow in WASP-43b elicited by deep wind jets?" Monthly Notices of the Royal Astronomical Society 496, no. 3 (2020): 3582–614. http://dx.doi.org/10.1093/mnras/staa1733.

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ABSTRACT We present WASP-43b climate simulations with deep wind jets (down to 700 bar) that are linked to retrograde (westward) flow at the equatorial day side for p &lt; 0.1 bar. Retrograde flow inhibits efficient eastward heat transport and naturally explains the small hotspot shift and large day-night-side gradient of WASP-43b (Porb = Prot = 0.8135 d) observed with Spitzer. We find that deep wind jets are mainly associated with very fast rotations (Prot = Porb ≤ 1.5 d) which correspond to the Rhines length smaller than 2 planetary radii. We also diagnose wave activity that likely gives

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Gupta, Parag, David MacTaggart, and Radostin D. Simitev. "Differential Rotation in Convecting Spherical Shells with Non-Uniform Viscosity and Entropy Diffusivity." Fluids 8, no. 11 (2023): 288. http://dx.doi.org/10.3390/fluids8110288.

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Contemporary three-dimensional physics-based simulations of the solar convection zone disagree with observations. They feature differential rotation substantially different from the true rotation inferred by solar helioseismology and exhibit a conveyor belt of convective “Busse” columns not found in observations. To help unravel this so-called “convection conundrum”, we use a three-dimensional pseudospectral simulation code to investigate how radially non-uniform viscosity and entropy diffusivity affect differential rotation and convective flow patterns in density-stratified rotating spherical

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