Academic literature on the topic 'Low to Moderate Reynolds Numbers'

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Journal articles on the topic "Low to Moderate Reynolds Numbers"

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Perot, J. B., and S. M. De Bruyn Kops. "Modeling turbulent dissipation at low and moderate Reynolds numbers." Journal of Turbulence 7 (January 2006): N69. http://dx.doi.org/10.1080/14685240600907310.

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Oliver, D. L. R., and J. N. Chung. "Flow about a fluid sphere at low to moderate Reynolds numbers." Journal of Fluid Mechanics 177 (April 1987): 1–18. http://dx.doi.org/10.1017/s002211208700082x.

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The steady-state equations of motion are solved for a fluid sphere translating in a quiescent medium. A semi-analytical series truncation method is employed in conjunction with a cubic finite-element scheme. The range of Reynolds numbers investigated is from 0.5 to 50. The range of viscosity ratios is from 0 (gas bubble) to 107 (solid sphere). The flow structure and the drag coefficients agree closely with the limited available experimental measurements and also compare favourably with published finite-difference solutions. The strength of the internal circulation was found to increase with in
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Fonseca, F., and H. J. Herrmann. "Sedimentation of oblate ellipsoids at low and moderate Reynolds numbers." Physica A: Statistical Mechanics and its Applications 342, no. 3-4 (2004): 447–61. http://dx.doi.org/10.1016/j.physa.2004.05.043.

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Chang, Eugene J., and Martin R. Maxey. "Unsteady flow about a sphere at low to moderate Reynolds number. Part 1. Oscillatory motion." Journal of Fluid Mechanics 277 (October 25, 1994): 347–79. http://dx.doi.org/10.1017/s002211209400279x.

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A direct numerical simulation, based on spectral methods, has been used to compute the time-dependent, axisymmetric viscous flow past a rigid sphere. An investigation has been made for oscillatory flow about a zero mean for different Reynolds numbers and frequencies. The simulation has been verified for steady flow conditions, and for unsteady flow there is excellent agreement with Stokes flow theory at very low Reynolds numbers. At moderate Reynolds numbers, around 20, there is good general agreement with available experimental data for oscillatory motion. Under steady flow conditions no sepa
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Lin, Yuan, Jian Hao Tan, Nhan Phan-Thien, and Boo Cheong Khoo. "Settling of particle-suspension drops at low to moderate Reynolds numbers." European Journal of Mechanics - B/Fluids 61 (January 2017): 72–76. http://dx.doi.org/10.1016/j.euromechflu.2016.11.003.

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Sekhar, T. V. S. "MHD flow past a sphere at low and moderate Reynolds numbers." Computational Mechanics 31, no. 5 (2003): 437–44. http://dx.doi.org/10.1007/s00466-003-0448-x.

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Biswas, G., M. Breuer, and F. Durst. "Backward-Facing Step Flows for Various Expansion Ratios at Low and Moderate Reynolds Numbers." Journal of Fluids Engineering 126, no. 3 (2004): 362–74. http://dx.doi.org/10.1115/1.1760532.

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This paper is concerned with the behavior of flows over a backward-facing step geometry for various expansion ratios H/h=1.9423, 2.5 and 3.0. A literature survey was carried out and it was found that the flow shows a strong two-dimensional behavior, on the plane of symmetry, for Reynolds numbers ReD=ρUbD/μ below approximately 400 (Ub=bulk velocity and D=hydraulic diameter). In this Reynolds number range, two-dimensional predictions were carried out to provide information on the general integral properties of backward-facing step flows, on mean velocity distributions and streamlines. Informatio
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SHENOY, A. R., and C. KLEINSTREUER. "Flow over a thin circular disk at low to moderate Reynolds numbers." Journal of Fluid Mechanics 605 (May 23, 2008): 253–62. http://dx.doi.org/10.1017/s0022112008001626.

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Computation of viscous flow over a circular disk of aspect ratio 10 (thickness/diameter) in the Reynolds number (Re) range of 10 to 300 was performed. The following flow regimes were observed: (I) steady axisymmetric flow when Re < 135, with the presence of a toroidal vortex behind the disk; (II) regular bifurcation with loss of azimuthal symmetry but with planar symmetry and a double-threaded wake, for 135 ≤ Re < 155; (III) three-dimensional flow with periodic shedding of double-sided hairpin-shaped vortex structures and periodic motion of the separation region for 155 ≤ Re < 172; (I
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Tian, Xinliang, Longfei Xiao, Xiangdong Zhang, Jianmin Yang, Longbin Tao, and Dan Yang. "Flow around an oscillating circular disk at low to moderate Reynolds numbers." Journal of Fluid Mechanics 812 (January 12, 2017): 1119–45. http://dx.doi.org/10.1017/jfm.2016.800.

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Direct numerical simulations of the flow induced by a circular disk oscillating sinusoidally along its axis are performed. The aspect ratio ($\unicode[STIX]{x1D712}=\text{diameter}/\text{thickness}$) of the disk is 10. The Reynolds number ($\mathit{Re}$), based on the maximum speed and the diameter of the disk, is in the range of $50\leqslant \mathit{Re}\leqslant 800$. The Keulegan–Carpenter number ($KC$) is in the range of $1\leqslant KC\leqslant 24$. Five flow regimes are observed in the considered $\mathit{Re}$–$KC$ space: (I) axisymmetric flow (AS), (II) planar symmetric flow in the low-$K
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Alassar, Rajai S. "Forced Convection Past an Oblate Spheroid at Low to Moderate Reynolds Numbers." Journal of Heat Transfer 127, no. 9 (2005): 1062–70. http://dx.doi.org/10.1115/1.1999654.

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Abstract Forced convection past a heated oblate spheroid is studied in an attempt to investigate the effect of the axis ratio on the heat transfer rate. The time-dependent full Navier–Stokes and energy equations are solved using a series truncation method. The axis ratios considered range from 1∕2 to 1 (a perfect sphere). The results for the flow and thermal fields are satisfactorily compared with relevant published research. The results are presented in the form of streamlines, isotherms, and the local and averaged Nusselt number distributions.
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Dissertations / Theses on the topic "Low to Moderate Reynolds Numbers"

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Konozsy, Laszlo. "Multiphysics CFD modelling of incompressible flows at Low and Moderate Reynolds Numbers." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7860.

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In this Ph.D. thesis, a novel high-resolution Godunov-type numerical procedure has been developed for solving the unsteady, incompressible Navier-Stokes equations for constant and variable density flows. The proposed FSAC-PP approach encompasses both artificial compressibility (AC) and fractional step (FS) pressure-projection (PP) methods of Chorin [3, 4] in a unified solution concept. To take advantage of different computational strategies, the FS and AC methods have been coupled (FSAC formulation), and further a PP step has been employed at each pseudo-time step. To provide time-accurate sol
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Patrick, Wilfred Vinod. "Computations of Flow Structures and Heat Transfer in a Dimpled Channel at Low to Moderate Reynolds Number." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/33415.

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Time-accurate calculations are used to investigate the three-dimensional flow structure and understand its influence on the heat transfer in a channel with concave indentations on one wall. A dimple depth to channel height ratio of 0.4 and dimple depth to imprint diameter ratio of 0.2 is used in the calculations. The Reynolds number (based on channel height) varies from Re = 25 in the laminar regime to Re = 2000 in the early turbulent regime. Fully developed flow and heat transfer conditions were assumed and a constant heat flux boundary condition was applied to the walls of the channel. In th
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Ames, Richard Gene. "On the flowfield and forces generated by a rectangular wing undergoing moderate reduced frequency flapping at low reynolds number." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/12468.

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Silano, Gabriella. "Numerical simulations of thermal convection at high Prandtl numbers." Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3211.

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2007/2008<br>In this thesis we present the results of an extensive campaign of direct numerical simulations of Rayleigh-B\'enard convection at high Prandtl numbers ($10^{-1}\leq Pr \leq 10^4$) and moderate Rayleigh numbers ($10^{5}\leq Pr \leq 10^9$). The computational domain is a cylindrical cell of aspect-ratio (diameter over cell height) $\Gamma=1/2$, with the no-slip condition imposed to the boundaries. By scaling the results, we find a $1/\sqrt{Pr}$ correction to apply to the free-fall velocity, obtaining a more appropriate representation of the large scale velocity at high $Pr$. We
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Biswas, Anupam. "Hydrodynamic interaction between cylinders at moderate Reynolds numbers." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44730.

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The hydrodynamic interaction between two cylinders perpendicular to the freestream, in a tandem arrangement was studied for moderate Reynolds numbers (1≤Re≤40). The influence of multiple geometric variables was considered: separation distances between the cylinders, ellipticity of the cylinders, the cylinder aspect ratio, and the angular inclination between the cylinders. In the first part of this study, a numerical investigation of the two-dimensional steady flow past cylinders was carried out. The characteristic length, D, in all simulations was taken to be twice the major axis of the cyli
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Sirisup, Sirod. "Linear stability of plane Couette flow at moderate Reynolds numbers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq64453.pdf.

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Bell, Martin Derek. "Ordering of particulate suspensions in Couette flow at moderate Reynolds numbers." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28901.

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A remarkable ordering phenomenon has been seen to occur when a suspension of particles undergoes shear at particle Reynolds numbers of the order of or greater than one in the annular gap of a Couette type shearing device. This particulate ordering was observed and studied with both suspensions of rigid spheres and suspensions of polystyrene latex aggregates formed in the presence of shear within the gap. Each of these systems was studied under a variety of initial conditions in order to define the particular flow conditions required for particle alignment to occur. It was found that particulat
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Giacobello, Matteo. "Wake structure of a transversely rotating sphere at moderate Reynolds numbers." Online version, 2005. http://repository.unimelb.edu.au/10187/2840.

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Over the last century, the problem of a viscous flow past a sphere has received on-going attention due to its many engineering applications. These include combustion processes, sediment transport processes and atmospheric flow problems, where the sphere serves as a good model for more general bluff body particles. In these environments, particles may be subjected to both translational and rotational velocities. The objective of this study was to investigate the effect that sphere rotation, about an axis transverse to the freestream flow, has on the characteristics or the vertical wake struc
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Ishimoto, Kenta. "Hydrodynamics of squirming locomotion at low Reynolds numbers." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199079.

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Heathcote, Samuel Francis. "Flexible flapping airfoil propulsion at low Reynolds numbers." Thesis, University of Bath, 2006. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432380.

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Books on the topic "Low to Moderate Reynolds Numbers"

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Kohr, Mirela. Viscous incompressible flow for low Reynolds numbers. WIT, 2004.

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Borthwick, A. G. L. Jet-forced flow inside a circle at very low Reynolds numbers. University of Salford Department of Civil Engineering, 1988.

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Morgan, Harry L. A study of high-lift airfoils at high Reynolds numbers in the Langley Low-Turbulence Pressure Tunnel. National Aeronautics and Space Administration, Scientific and Technical Information Office, 1989.

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Morgan, Harry L. A study of high-lift airfoils at high Reynolds numbers in the Langley Low-Turbulence Pressure Tunnel. National Aeronautics and Space Administration, Scientific and Technical Information Office, 1989.

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Morgan, Harry L. A study of high-lift airfoils at high Reynolds numbers in the Langley Low-Turbulence Pressure Tunnel. National Aeronautics and Space Administration, Scientific and Technical Information Office, 1989.

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Hicks, R. M. An evaluation of three two-dimensional computational fluid dynamics codes including low Reynolds numbers and transonic Mach numbers. Ames Research Center, 1991.

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S, Walker Betty, Millard Betty F, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Experimental results for the Eppler 387 airfoil at low Reynolds numbers in the Langley Low-Turbulence Pressure Tunnel. National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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C, Yu James, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., eds. New technique for experimental generation of two-dimensional blade-vortex interaction at low Reynolds numbers. National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., ed. Effects of independent variation of Mach and Reynolds numbers on the low-speed aerodynamic characteristics of the NACA 0012 airfoil section. National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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Chan, Y. Y. Analysis of experimental data for cast 10-2/DOA 2 supercritical airfoil at low Reynolds numbers and application to high Reynolds number flow. National Research Council of Canada, 1989.

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Book chapters on the topic "Low to Moderate Reynolds Numbers"

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Iwamoto, Kaoru, Yuji Suzuki, and Nobuhide Kasagi. "Nonlinear Interaction of Coherent Structures in Wall Turbulence at Low-to-Moderate Reynolds Numbers." In IUTAM Symposium on Reynolds Number Scaling in Turbulent Flow. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-007-0997-3_5.

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Pozrikidis, C. "Flow at Low Reynolds Numbers." In Fluid Dynamics. Springer US, 2001. http://dx.doi.org/10.1007/978-1-4757-3323-5_9.

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Sadhal, S. S., P. S. Ayyaswamy, and J. N. Chung. "Transport at Low Reynolds Numbers." In Transport Phenomena with Drops and Bubbles. Springer New York, 1997. http://dx.doi.org/10.1007/978-1-4612-4022-8_3.

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Baranyi, L. "Orbiting Cylinder at Low Reynolds Numbers." In IUTAM Symposium on Unsteady Separated Flows and their Control. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9898-7_13.

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Zeytounian, Radyadour Kh. "The Limit of Very Low Reynolds Numbers." In Theory and Applications of Viscous Fluid Flows. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-10447-7_6.

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Langbein, D. "Drop and Bubble Migration at Moderate Reynolds and Marangoni Numbers." In Microgravity Fluid Mechanics. Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-50091-6_43.

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Render, P. M., J. L. Stollery, and B. R. Williams. "Aerofoils at Low Reynolds Numbers—Prediction and Experiment." In Numerical and Physical Aspects of Aerodynamic Flows III. Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4612-4926-9_9.

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Likhachev, Oleg A. "Coherent Vortical Structures in Plane Far Wakes at Moderate Reynolds Numbers." In Nonlinear Instability of Nonparallel Flows. Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85084-4_29.

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Zapryanov, Z., and S. Tabakova. "Finite Deformations of Drops and Bubbles at Moderate Reynolds Numbers Flows." In Dynamics of Bubbles, Drops and Rigid Particles. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9255-0_14.

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McGhee, Robert J., and Betty S. Walker. "Performance Measurements of an Airfoil at Low Reynolds Numbers." In Lecture Notes in Engineering. Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-84010-4_11.

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Conference papers on the topic "Low to Moderate Reynolds Numbers"

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L., Mark, Braxton Harter, Matthew McCrink, and James Gregory. "Impact of Wake Structure Characteristics on Small-Scale Rotor Performance over a Range of Reynolds Numbers." In Vertical Flight Society 80th Annual Forum & Technology Display. The Vertical Flight Society, 2024. http://dx.doi.org/10.4050/f-0074-2018-12711.

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Small-scale rotorcraft exhibit degraded aerodynamic efficiency, which has been linked to non-ideal losses within the wake. Unique high-frequency, broad-band features have also been observed, without a physical verification of their origin. This work seeks to gather insight into the behavior of the rotor wake structures as a function of Reynolds number (Re), relate this to performance capabilities and the corresponding far-field acoustic signature. Two-component particle image velocimetry (PIV), performance, and acoustic measurements were performed using three small-scale, NACA 0012 rotors oper
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Winslow, Justin, Zohaib Hasnain, Moble Benedict, and Inderjit Chopra. "Performance and Flowfield Measurements of a Micro-Air-Vehicle Scale Helicopter Rotor." In Vertical Flight Society 70th Annual Forum & Technology Display. The Vertical Flight Society, 2014. http://dx.doi.org/10.4050/f-0070-2014-9663.

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This paper describes the systematic performance measurements and flowfield studies (PIV) conducted towards understanding and optimizing the hover performance of a MAV-scale helicopter rotor operating at Reynolds numbers of 30,000 or less. The rotor parameters that were varied include blade airfoil profile, blade chord, number of blades, blade twist, planform taper and winglets at blade tip. Blade airfoil section had a significant impact on the hover efficiency and among the large number of airfoil sections tested, the ones with the lower thickness to chord ratios and moderate camber (4.5% to 6
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Jones, Anya, Joachim Hodara, Kenneth Granlund, Michael Ol, Karen Mulleners, and Marilyn Smith. "Blade Sections in Streamwise Oscillations into Reverse Flow." In Vertical Flight Society 71st Annual Forum & Technology Display. The Vertical Flight Society, 2015. http://dx.doi.org/10.4050/f-0071-2015-10273.

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A low-Reynolds number rectilinear analog of the retreating blade problem is considered by computationally and experimentally studying a NACA0012 blade in spanwise oscillation in a free stream. Three-dimensional hybrid RANS-LES simulations with spanwise periodic boundary conditions and experimental flow visualization support the description of experimental direct force measurements for a wide range reduced frequencies and advance ratios, including fully reversed flow conditions. A fixed incidence of 6 degrees is taken as a nominally attached-flow case, and agrees reasonably well with Isaacs' th
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Runco, Carl, Brett Himmelberg, and Moble Benedict. "Performance and Flowfield Measurements of a Meso-Scale Cycloidal Rotor in Hover." In Vertical Flight Society 73rd Annual Forum & Technology Display. The Vertical Flight Society, 2017. http://dx.doi.org/10.4050/f-0073-2017-12298.

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This paper details the performance and flowfield measurements on a meso-scale cycloidal rotor. Owing to the small size (rotor radius of 1 inch), the cycloidal rotor investigated in the present study operates at ultralow Reynolds numbers (Re∼11,000) and also utilizes a blade design completely different from the previous studies. The meso-scale rotor utilizes a low aspect ratio cantilevered blade design with flat plate airfoil and elliptical blade planform, which means that 3-dimensional effects will be more prominent. A highly sensitive, miniature 3-component balance was developed to measure th
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Ananda, Gavin, Pritam Sukumar, and Michael Selig. "Low-to-Moderate Aspect Ratio Wings Tested at Low Reynolds Numbers." In 30th AIAA Applied Aerodynamics Conference. American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-3026.

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Kuester, Matthew S., Aurelien Borgoltz, and William J. Devenport. "Experimental Visualization of Junction Separation Bubbles at Low- to Moderate-Reynolds Numbers." In 34th AIAA Applied Aerodynamics Conference. American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-3880.

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HANUS, G., K. MIKKELSEN, S. OLSTAD, and S. CARISTIA. "Supersonic wind tunnel diffuser performance with high model blockageat moderate to low Reynolds numbers." In 27th Joint Propulsion Conference. American Institute of Aeronautics and Astronautics, 1991. http://dx.doi.org/10.2514/6.1991-2274.

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Abdessemed, Nadir, Spencer Sherwin, and Vassilios Theofilis. "On Unstable 2D Basic States in Low Pressure Turbine Flows at Moderate Reynolds Numbers." In 34th AIAA Fluid Dynamics Conference and Exhibit. American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-2541.

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Zhou, Ying, and Zhi J. Wang. "A Low-Frequency Instability/Oscillation near the Airfoil Leading-Edge at Low Reynolds Numbers and Moderate Incidences." In 20th AIAA Computational Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-3548.

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Balakumar, Ponnampalam. "Direct Numerical Simulation of Flows over an NACA-0012 Airfoil at Low and Moderate Reynolds Numbers." In 47th AIAA Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-3978.

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Reports on the topic "Low to Moderate Reynolds Numbers"

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Reed, Helen L. Three-Dimensional Unsteady Separation at Low Reynolds Numbers. Defense Technical Information Center, 1990. http://dx.doi.org/10.21236/ada225167.

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Jamison, Andrew, and Andrew D. Ketsdever. Performance Comparisons of Underexpanded Orifices and DeLaval Nozzles at Low Reynolds Numbers. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada406211.

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Ketsdever, Andrew D., Michael T. Clabough, Sergey F. Gimelshein, and Alina Alexeenko. Experimental and Numerical Determination of Micropropulsion Device Efficiencies at Low Reynolds Numbers. Defense Technical Information Center, 2004. http://dx.doi.org/10.21236/ada432073.

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Mueller, Thomas J., and Gabriel E. Torres. Aerodynamics of Low Aspect Ratio Wings at Low Reynolds Numbers with Applications to Micro Air Vehicle Design and Optimization. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada397533.

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Ayoul-Guilmard, Q., S. Ganesh, M. Nuñez, et al. D5.3 Report on theoretical work to allow the use of MLMC with adaptive mesh refinement. Scipedia, 2021. http://dx.doi.org/10.23967/exaqute.2021.2.002.

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This documents describes several studies undertaken to assess the applicability of MultiLevel Monte Carlo (MLMC) methods to problems of interest; namely in turbulent fluid flow over civil engineering structures. Several numerical experiments are presented wherein the convergence of quantities of interest with mesh parameters are studied at different Reynolds’ numbers and geometries. It was found that MLMC methods could be used successfully for low Reynolds’ number flows when combined with appropriate Adaptive Mesh Refinement (AMR) strategies. However, the hypotheses for optimal MLMC performanc
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