Relevant bibliographies by topics / Second moment closure model

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Second moment closure model'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Second moment closure model"

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Harcourt, Ramsey R. "An Improved Second-Moment Closure Model of Langmuir Turbulence." Journal of Physical Oceanography 45, no. 1 (January 2015): 84–103. http://dx.doi.org/10.1175/jpo-d-14-0046.1.

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AbstractA prior second-moment closure (SMC) model of Langmuir turbulence in the upper ocean is modified by introduction of inhomogeneous pressure–strain rate and pressure–scalar gradient closures that are similar to the high Reynolds number, near-wall treatments for solid wall boundaries. This repairs several near-surface defects in the algebraic Reynolds stress model (ARSM) of the prior SMC by redirecting Craik–Leibovich (CL) vortex force production of turbulent kinetic energy out of the surface-normal vertical component and into a horizontal one, with an associated reduction in near-surface CL production of vertical momentum flux. A surface-proximity function introduces a new closure parameter that is tuned to previous results from large-eddy simulations (LES), and a numerical SMC model based on stability functions from the new ARSM produces improved comparisons with mean profiles of momentum and TKE components from steady-state LES results forced by aligned wind and waves. An examination of higher-order quasi-homogeneous closures and a numerical simulation of Langmuir turbulence away from the boundaries both show the near-surface inhomogeneous closure to be both necessary for consistency and preferable for simplicity.
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Harcourt, Ramsey R. "A Second-Moment Closure Model of Langmuir Turbulence." Journal of Physical Oceanography 43, no. 4 (April 1, 2013): 673–97. http://dx.doi.org/10.1175/jpo-d-12-0105.1.

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Abstract The Reynolds stress equation is modified to include the Craik–Leibovich vortex force, arising from the interaction of the phase-averaged surface wave Stokes drift with upper-ocean turbulence. An algebraic second-moment closure of the Reynolds stress equation yields an algebraic Reynolds stress model (ARSM) that requires a component of the vertical momentum flux to be directed down the gradient of the Stokes drift, in addition to the conventional component down the gradient of the ensemble-averaged Eulerian velocity. For vertical and horizontal component fluctuations, the momentum flux must be closed using the form , where the coefficient is generally distinct from the eddy viscosity or eddy diffusivity . Rational expressions for the stability functions , , and are derived for use in second-moment closure models where the turbulent velocity and length scales are dynamically modeled by prognostic equations for and . The resulting second-moment closure (SMC) includes the significant effects of the vortex force in the stability functions, in addition to source terms contributing to the and equations. Additional changes are made to the way in which is limited by proximity to boundaries or by stratification. The new SMC model is tuned to, and compared with, a suite of steady-state large-eddy simulation (LES) solutions representing a wide range of oceanic wind and wave forcing conditions. Comparisons with LES show the modified SMC captures important processes of Langmuir turbulence, but not without notable defects that may limit model generality.
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Galperin, Boris. "A second moment closure model for MHD turbulence." ZAMP Journal of Applied Mathematics and Physics 40, no. 5 (September 1989): 740–57. http://dx.doi.org/10.1007/bf00945874.

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Eisfeld, Bernhard, Chris Rumsey, and Vamshi Togiti. "Verification and Validation of a Second-Moment-Closure Model." AIAA Journal 54, no. 5 (May 2016): 1524–41. http://dx.doi.org/10.2514/1.j054718.

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Gomez, Carlos A., and Sharath S. Girimaji. "Toward second-moment closure modelling of compressible shear flows." Journal of Fluid Mechanics 733 (September 23, 2013): 325–69. http://dx.doi.org/10.1017/jfm.2013.428.

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AbstractCompressibility profoundly affects many aspects of turbulence in high-speed flows, most notably stability characteristics, anisotropy, kinetic–potential energy interchange and spectral cascade rate. We develop a unified framework for modelling pressure-related compressibility effects by characterizing the role and action of pressure in different speed regimes. Rapid distortion theory is used to examine the physical connection between the various compressibility effects leading to model form suggestions for pressure–strain correlation, pressure–dilatation and dissipation evolution equations. The closure coefficients are established using fixed-point analysis by requiring consistency between model and DNS asymptotic behaviour in compressible homogeneous shear flow. The closure models are employed to compute high-speed mixing layers and boundary layers. The self-similar mixing-layer profile, increased Reynolds stress anisotropy and diminished mixing-layer growth rates with increasing Mach number are all well captured. High-speed boundary-layer results are also adequately replicated even without the use of advanced thermal-flux models or low-Reynolds-number corrections.
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Eisfeld, Bernhard, Chris Rumsey, and Vamshi Togiti. "Erratum: Verification and Validation of a Second-Moment Closure Model." AIAA Journal 54, no. 9 (September 2016): 2927–28. http://dx.doi.org/10.2514/1.j055336.

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Yang, S. L., B. D. Peschke, and K. Hanjalic. "Second-Moment Closure Model for IC Engine Flow Simulation Using Kiva Code1." Journal of Engineering for Gas Turbines and Power 122, no. 2 (August 31, 1999): 355–63. http://dx.doi.org/10.1115/1.483213.

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The flow and turbulence in an IC engine cylinder were studied using the SSG variant of the Reynolds stress turbulence closure model. In-cylinder turbulence is characterized by strong turbulence anisotropy and flow rotation, which aid in air-fuel mixing. It is argued that solving the differential transport equations for each turbulent stress tensor component, as implied by second-moment closures, can better reproduce stress anisotropy and effects of rotation, than with eddy-viscosity models. Therefore, a Reynolds stress model that can meet the demands of in-cylinder flows was incorporated into an engine flow solver. The solver and SSG turbulence model were first successfully tested with two different validation cases. Finally, simulations were applied to IC-engine like geometries. The results showed that the Reynolds stress model predicted additional flow structures and yielded less diffusive profiles than those predicted by an eddy-viscosity model. [S0742-4795(00)00101-0]
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Jones, W. P., and A. Pascau. "Calculation of Confined Swirling Flows With a Second Moment Closure." Journal of Fluids Engineering 111, no. 3 (September 1, 1989): 248–55. http://dx.doi.org/10.1115/1.3243638.

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A Reynolds stress transport equation model and the k–ε turbulence model have been applied to the calculation of a confined, strongly swirling flow. A comparison of the results with measurement shows clearly the superiority of the transport equation model. It reproduces the major features of the flow including the strong stabilizing effects of the swirl on the shear stresses and the calculated axial and circumferential components of mean velocity are in reasonable agreement with measured profiles. The corresponding normal stresses are, however, overpredicted but previously suggested modifications to the ε-equation to account for rotation did not bring any improvement. The k–ε model does not contain any mechanism to describe the stabilizing effects of swirling motion and as a consequence it performs poorly; large discrepancies exist between the measured and calculated mean velocity field.
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Durbin, P. A., and C. G. Speziale. "Realizability of second-moment closure via stochastic analysis." Journal of Fluid Mechanics 280 (December 10, 1994): 395–407. http://dx.doi.org/10.1017/s0022112094002983.

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It is shown that realizability of second-moment turbulence closure models can be established by finding a Langevin equation for which they are exact. All closure models currently in use can be derived formally from the type of Langevin equation described herein. Under certain circumstances a coefficient in that formalism becomes imaginary. The regime in which models are realizable is, at least, that for which the coefficient is real. The present method does not imply unrealizable solutions when the coefficient is imaginary, but it does guarantee realizability when the coefficient is real; hence, this method provides sufficient, but not necessary, conditions for realizability. Illustrative computations of homogeneous shear flow are presented. It is explained how models can be modified to guarantee realizability in extreme non-equilibrium situations without altering their behaviour in the near-equilibrium regime for which they were formulated.
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Smyth, W. D., H. Burchard, and L. Umlauf. "Baroclinic Interleaving Instability: A Second-Moment Closure Approach." Journal of Physical Oceanography 42, no. 5 (May 1, 2012): 764–84. http://dx.doi.org/10.1175/jpo-d-11-066.1.

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Abstract Interleaving motions on a wide, baroclinic front are modeled using a second-moment closure to represent unresolved fluxes by turbulence and salt fingering. A linear perturbation analysis reveals two broad classes of unstable modes. First are scale-selective modes comparable with interleaving as observed in oceanic fronts. These correspond well with observations in some respects but grow by a very different mechanism, which ought to be easily distinguished in hydrographic profiles. The second mode type is the so-called ultraviolet catastrophe, which is expected to lead to steppy profiles even in the absence of interleaving. Both modes are driven by positive feedbacks between interleaving and the underlying small-scale mixing processes. Contrary to expectations, use of the second-moment closure in place of earlier empirical mixing models does not lead to improved agreement with observations.
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Dissertations / Theses on the topic "Second moment closure model"

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Tremblay, Frédéric 1970. "Introduction of a second-moment closure turbulence model in a finite element formulation." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27258.

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The present thesis deals with the successful introduction of a second-moment closure turbulence model into a computer program using the Finite Element Method to solve the Navier-Stokes equations. The implementation presented has the advantage of using an equal interpolation for all the variables. It is also very economical in terms of the amount of memory required from the computer, since a fully decoupled formulation has been adopted, along with an iterative solver which permits to store in memory only the non-zero coefficients of the linear system of equations to be solved. Specialized elements are used to avoid resolving the near-wall region of the flow. The apparent viscosity concept is derived for the finite element formulation, along with a correction factor which permits a better representation of the Reynolds stresses. The RSM is compared to the older $k - epsilon$ model in two test cases where experimental data was available. The conclusion drawn from this work is that the RSM is able to reproduce more phenomenon occurring in turbulent flows than the $k - epsilon$ model. It is thought that the $k - epsilon$ model will gradually be supplanted by more complex models, as more computing power become available.
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Tremblay, Frédéric. "Introduction of a second-moment closure turbulence model in a finite element formulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29632.pdf.

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Huang, G. P. G. "The computation of elliptic turbulent flows with second-moment-closure models." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377632.

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Sadek, Shereef Aly. "A Basic Three-Dimensional Turbulent Boundary Layer Experiment To Test Second-Moment Closure Models." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/29706.

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In this work, a three-dimensional turbulent boundary layer experiment was set up with alternating stream-wise and span-wise pressure gradients. The pressure gradients are generated as a result of the test section wavy side wall shape. Each side had six sine waves with a trough to peak magnitude to wavelength ratio of 0.25. Boundary layer control was used so that the flow over the side walls remains attached. The mean flow velocity components, static and total pressures were measured at six plane along the stream-wise direction. The alternating mean span-wise and stream-wise pressure gradients created alternating stream-wise and span-wise vorticity fluxes, respectively, along the test section. As the flow developed downstream the vorticity created at the tunnel floor and ceiling diffused away from the wall. The vorticity components in the stream-wise and span-wise directions are strengthened due to stretching and tilting terms in the vorticity transport equations. The positive-z half of the test section contains large areas that generate positive vorticity flux in the trough region and smaller areas generating negative vorticity around the wave peak. The opposite is true for the negative-z half of the test-section. This results in a large positive stream-wise vorticity in the positive-z half and negative stream-wise vorticity in the negative-z half of the test-section. The smaller regions of opposite sign vorticity in each half tend to mix the flow such that as they diffuse away from the wall, the turbulent stresses are more uniform. Turbulent fluctuating velocity components were measured using Laser Doppler Velocimetery. Mean velocities as well as Reynolds stresses and triple velocity component correlations were measured at thirty stations along the last wave in the test section. Profiles at the center of the test section showed three dimensionality, but exhibited high turbulence intensities in the outer layer. Profiles off the test section centerline are highly three dimensional with multiple peaks in the normal stress profiles. The flow also reaches a state where all the normal stresses have equal magnitudes while the shear stresses are non-zero. Flow angles, flow gradient angles and shear stress angles show very large differences between wall values and outer layer vlaues. The shear stress angle lagged the flow gradient angle indicating non-equilibrium. A turbulent kinetic energy transport budget is performed for all profiles and the turbulence kinetic energy dissipation rate is estimated. Spectral measurements were also made and an independent estimate of the kinetic energy dissipation rate is made. These estimates agree very well with those estimates made by balancing the turbulence kinetic energy transport equation. Multiple turbulent diffusion models are compared to measured quantities. The models varied in agreement with experimental data. However, fair agreement with turbulence kinetic energy turbulent diffusion is observed. A model for the dissipation rate tensor anisotropy is used to extract estimates of the pressure-strain tensor from the Reynolds stress transport equations. The pressure-strain estimates are compared with some of the models in the literature. The comparison showed poor agreement with estimated pressure-strain values extracted from experimental data. A tentative model for the turbulent Reynolds shear stress angle is developed that captures the shear stress angle near wall behavior to a very good extent. The model contains one constant that is related to mean flow variables. However, the developed expression needs modification so that the prediction is improved along the entire boundary layer thickness.
Ph. D.
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Ullrich, Matthias [Verfasser], Cameron [Akademischer Betreuer] Tropea, Suad [Akademischer Betreuer] Jakirlić, and Johannes [Akademischer Betreuer] Janicka. "Second-moment closure modeling of turbulent bubbly flows within the two-fluid model framework / Matthias Ullrich ; Cameron Tropea, Suad Jakirlic, Johannes Janicka." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1126644250/34.

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Al-Sharif, Sharaf. "Computation of unsteady and non-equilibrium turbulent flows using Reynolds stress transport models." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/computation-of-unsteady-and-nonequilibrium-turbulent-flows-using-reynolds-stress-transport-models(935dbd20-b049-4b62-9e1c-eebb261675e5).html.

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In this work the predictive capability of a number of Reynolds stress transport(RST) models was first tested in a range of non-equilibrium homogeneous flows, comparisons being drawn with existing direct numerical simulation (DNS) results and physical measurements. The cases considered include both shear and normally strained flows, in some cases with a constant applied strain rate, and in others where this varied with time. Models were generally found to perform well in homogeneous shear at low shear rates, but their performance increasingly deteriorated at higher shear rates. This was attributed mainly to weaknesses in the pressure-strain rate models, leading to over-prediction of the shear stress component of the stress anisotropy tensor at high shear rates. Performance in irrotational homogeneous strains was generally good, and was more consistent over a much wider range of strain rates. In the experimental plane strain and axisymmetric contraction cases, with time-varying strain rates, there was evidence of an accelerated dissipation rate generation. Significant improvement was achieved through the use of an alternative dissipation rate generation term, Pε , in these cases, suggesting a possible route for future modelling investigation. Subsequently, the models were also tested in the inhomogeneous case of pulsating channel flow over a wide range of frequencies, the reference for these cases being the LES of Scotti and Piomelli (2001). A particularly challenging feature in this problem set was the partial laminarisation and re-transition that occurred cyclically at low and, to a lesser extent, intermediate frequencies. None of the models tested were able to reproduce correctly all of the observed flow features, and none returned consistently superior results in all the cases examined. Finally, models were tested in the case of a plane jet interacting with a rectangular dead-end enclosure. Two geometric configurations are examined, corresponding a steady regime, and an intrinsically unsteady regime in which periodic flow oscillations are experimentally observed (Mataoui et al., 2003). In the steady case generally similar flow patterns were returned by the models tested, with some differences arising in the degree of downward deflection of the impinging jet, which in turn affected the level of turbulence energy developing in the lower part of the cavity. In the unsteady case, only two of the models tested, a two-equation k-ε model and an advanced RST model, correctly returned purely periodic solutions. The other two RST models, based on linear pressure-strain rate terms, returned unsteady flow patterns that exhibited complex oscillations with significant cycle-to-cycle variations. Unfortunately, the limited availability of reliable experimental data did not allow a detailed quantitative examination of model performance.
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Mangeon, Gaëtan. "Modélisation au second ordre des transferts thermiques turbulents pour tous types de conditions aux limites thermiques à la paroi." Thesis, Pau, 2020. http://www.theses.fr/2020PAUU3018.

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Cette thèse propose une modélisation avancée des transferts thermiques dans les écoulements turbulents pour tous les types de conditions aux limites sur la température aux parois. Ces travaux reposent sur un double constat : d'une part, les modèles de turbulence traitant la thermique de l'écoulement dans la plupart des applications industrielles sont basés sur de simples relations algébriques incapables de représenter des physiques complexes, comme la convection naturelle et la thermique de la zone proche-paroi. D'autre part, la condition aux limites sur la température à la paroi (température fixée, flux de chaleur imposé ou transfert thermique conjugué) influence le comportement proche-paroi des variables thermiques turbulents. La formulation du modèle bas-Reynolds du second ordre des flux thermiques turbulents EBDFM (Elliptic Blending Differential Flux Model), développée à l'origine pour traiter des cas où une température est fixée à la paroi, a été étendue à des cas de flux de chaleur imposé et de transfert thermique conjugué. Cette nouvelle formulation se fonde sur des analyses asymptotiques rigoureuses des termes des équations de transport des flux thermiques turbulents pour chaque condition aux limites sur la température. Un des éléments essentiels de la nouvelle formulation de l'EBDFM est le ratio des échelles de temps thermique et dynamique R. Le comportement asymptotique de ce ratio dépend fortement de la condition aux limites : R tend vers le nombre de Prandtl à la paroi lorsqu'une température est imposée, et vers l'infini sinon. Ainsi, dans le but de reproduire fidèlement ce comportement, il s'est avéré nécessaire de résoudre des équations de transport pour la variance de température ¯(θ^'2 )et pour son taux de dissipation ε_θ puisque ces deux variables pilotent le comportement asymptotique de R. Par conséquent, cette thèse propose des modèles bas-Reynolds pour les variables ¯(θ^'2 )et ε_θ valables pour toutes les conditions aux limites thermiques. La nouvelle formulation du modèle EBDFM ainsi que les modèles de ¯(θ^'2 )et ε_θ ont été validées par des simulations réalisées avec le logiciel de CFD Code_Saturne pour des écoulements dans un canal plan en convection forcée
Advanced modeling of turbulent heat transfer for all thermal boundary conditions is proposed. This work was motivated by two facts: first, the thermal turbulent models used in most of the industrial computations are based on eddy-viscosity models which cannot deal with complex physics such as natural convection or heat transfer in the near-wall region. Then, the thermal boundary condition at the wall (imposed temperature, imposed heat flux, conjugate heat transfer) influences the near-wall behavior of the turbulent thermal variables. The formulation of the low-Reynolds number second moment closure EBDFM (Elliptic Blending Differential Flux Model), which was originally developed for an imposed temperature at the wall, has been extended to an imposed heat flux and a conjugate heat transfer condition. This new formulation is based on rigorous asymptotic analysis of the terms of the transport equation of the turbulent heat flux for all thermal boundary conditions. One of the key elements is the thermal-to-mechanical time-scale ratio R. Its asymptotic behavior highly depends on the thermal boundary condition: R goes to the Prandtl number at the wall for an imposed temperature and tends to infinity otherwise. Thus, solving a transport equation for the temperature variance ¯(θ^'2 ) and for its dissipation rate ε_θ is necessary to reproduce the asymptotic behavior of R. Indeed, these two variables drive the behavior of R in the near-wall region. Therefore, low-Reynolds number models for ¯(θ^'2 ) and ε_θ, valid for all thermal boundary conditions, are proposed. The new formulation of the EBDFM and the models for ¯(θ^'2 ) and ε_θ have been validated by performing Code_Saturne computations of channel flows in the forced convection regime
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Lin, Chao-An. "Three-dimensional computations of injection into swirling cross-flow using second-moment closure." Thesis, University of Manchester, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280543.

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Hogg, Simon I. "Second-moment-closure calculations of strongly-swirling confined flows with and without density variations." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328638.

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Tselepidakis, Demetrios P. "Development and application of a new second-moment closure for turbulent flows near walls." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332657.

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Books on the topic "Second moment closure model"

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Launder, B. E. (Brian Edward), ed. Modelling turbulence in engineering and the environment: Second-moment routes to closure. Cambridge: Cambridge University Press, 2011.

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Amano, R. S. Improvement of the second- and third-moment modeling of turbulence: Semi-annual progress report on "A study of Reynolds-stress closure model". Milwaukee, Wis: Dept. of Mechanical Engineering, University of Wisconsin - Milwaukee, 1986.

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Lea, C. J. Second-moment closure computations of in-cylinder flowsinidealisedreciprocating engines. Manchester: UMIST, 1994.

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Sajjadi, S. G. Second-moment closure modelling of turbulent flow over sand ripples. Salford: University of Salford Centre for Computational Fluid Dynamics and Turbulence, 1993.

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Speziale, Charles G. A preliminary compressible second-order closure model for high speed flows. Hampton, Va: ICASE, 1989.

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Realizability in second moment turbulence closures revisited. [Washington, DC: National Aeronautics and Space Administration, 1994.

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Lewis Research Center. Institute for Computational Mechanics in Propulsion., ed. Calculation of 3D turbulent jets in crossflow with a multigrid method and a second-moment closure model. Cleveland,Ohio: NASA Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1990.

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Second Order Closure Integrated PUFF (SCIPUFF) model verification and evaluation study. Silver Spring, Md: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Air Resources Laboratory, 1998.

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S, Sarkar, and Institute for Computer Applications in Science and Engineering., eds. A preliminary compressible second-order closure model for high speed flows. 1989.

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Pankaj, Goel, and United States. National Aeronautics and Space Administration, eds. Third-moment closure of turbulence for predictions of separating and reattaching shear flows: Final report on "A study of Reynolds-Stress Closure Model". [Washington, D.C.]: National Aeronautics and Space Administration, 1986.

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Book chapters on the topic "Second moment closure model"

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Maduta, Robert, and Suad Jakirlić. "Sensitizing Second-Moment Closure Model to Turbulent Flow Unsteadiness." In Computational Fluid Dynamics 2010, 341–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17884-9_42.

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Jakirlić, S., I. Hadžić, A. Djugum, and C. Tropea. "Boundary-layer Separation Computed by Second-Moment Closure Models." In New Results in Numerical and Experimental Fluid Mechanics III, 215–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-540-45466-3_26.

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Hanjalić, K., and S. Jakirlić. "A Model of Stress Dissipation in Second-Moment Closures." In Advances in Turbulence IV, 513–18. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1689-3_80.

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Demuren, A. O., and S. Sarkar. "Application of Second Moment Closure Models to Complex Flows: Part I—Wall Bounded Flows." In Instability, Transition, and Turbulence, 575–88. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2956-8_55.

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Simonin, O., E. Deutsch, and M. Boivin. "Large Eddy Simulation and Second-Moment Closure Model of Particle Fluctuating Motion in Two-Phase Turbulent Shear Flows." In Turbulent Shear Flows 9, 85–115. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-78823-9_7.

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Yang, Jianshan, Kun Luo, Yun Bai, and JianRen Fan. "Large Eddy Simulation of the Sandia Flame E and F Using Dynamic Second-Order Moment Closure (DSMC) Model." In Clean Coal Technology and Sustainable Development, 107–12. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2023-0_15.

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Leschziner, M. A., F. S. Lien, N. Ince, and C. A. Lin. "Computational Modelling of Complex 3D Flows with Second-Moment Closure Coupled to Low-Re Near-Wall Models." In Notes on Numerical Fluid Mechanics (NNFM), 144–53. Wiesbaden: Vieweg+Teubner Verlag, 1996. http://dx.doi.org/10.1007/978-3-322-89838-8_20.

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Kronenburg, A., and E. Mastorakos. "The Conditional Moment Closure Model." In Turbulent Combustion Modeling, 91–117. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0412-1_5.

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Fu, S., and S. Y. Huang. "Modelling the Compressibility Effect with Second-Moment Closure." In Computational Mechanics, 241. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75999-7_41.

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Jester-Zürker, R., and S. Jakirlić. "Second-Moment Closure Modelling of Swirl-Induced Separation." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 467–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39604-8_58.

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Conference papers on the topic "Second moment closure model"

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LIN, C., and C. LU. "Modelling three-dimensional gas-turbine-combustor model flow using second-moment closure." In 23rd Fluid Dynamics, Plasmadynamics, and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-3104.

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Spall, Robert E., Eugen Nisipeanu, and Adam Richards. "Assessment of a Second-Moment Closure Model for Strongly Heated Internal Gas Flows." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32018.

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Both low- and high-Reynolds-number versions of a stress–ω turbulence model were applied to the vertical flow of air through a tube with high wall heat flux boundary conditions. Heating rates were sufficiently high so that fluid properties varied significantly, and consequently fully developed flows did not result. Solutions were compared against experimental data existing in the literature. The results revealed that the inclusion of low-Reynolds-number corrections were necessary to achieve reasonable agreement with experiments in terms of predicted wall temperatures, and mean axial velocity and temperature profiles.
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Brørs, Bård, and Karl J. Eidsvik. "Prediction of Turbidity Currents with Boussinesq Viscosity and Second-Moment Closure Models." In 23rd International Conference on Coastal Engineering. New York, NY: American Society of Civil Engineers, 1993. http://dx.doi.org/10.1061/9780872629332.148.

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Borello, Domenico, Franco Rispoli, and Kemal Hanjalic. "Prediction of Tip-Leakage Flow in Axial Flow Compressor With Second Moment Closure." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90535.

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An innovative analysis based on second-moment closure (SMC), incorporating proper modelling of low-Re-number and wall proximity effects is adopted in conjunction with numerical model based on an in-house parallel finite element code for the prediction of a 3D linear compressor cascade flow with tip clearance. The strong interaction between the tip leakage vortex, the mainstream, the passage vortex and the other turbulent structures causes important portion of energy losses and it influences the overall performance of the compressors. A systematic comparison of the prediction of the proposed SMC with respect to a linear eddy viscosity closure (standard k-ε) and experiments is carried out. In the tip leakage the turbulent flow is characterized by an high level of anisotropy induced by complex shear effects. The present predictions demonstrates that second moment closures feature a superior capability to reproduce all major phenomenological features and mean flow parameters of turbomachinery flows.
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Sadek, Shereef, and Roger Simpson. "A Basic Three-Dimensional Turbulent Boundary Layer Experiment to Test Second-Moment Closure Models." In 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-698.

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Borello, Domenico, Franco Rispoli, and Kemal Hanjalic. "Prediction of Turbulence and Transition in Turbomachinery Flows Using an Innovative Second Moment Closure Modeling." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53706.

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The paper reports on the assessment of two low-Reynolds-number second-moment turbulence closures (Low-Re SMC) in predicting turbulence and laminar-to-turbulent transition in turbomachinery flows. The model under consideration are the one by Hanjalic and Jakirlic (1998) (HJ) and an innovative topology-free Elliptic Blending Model, EBM, (Manceau and Hanjalic, 2002) here presented in a revised formulation. An in-house finite element code based on a parallel Multi-Grid technique for the solution phase (Borello et al., 2003a) is used. The finite element method is applied on mixed Q2-Q1 element shape functions formulation coupled with an innovative Petrov-Galerkin stabilization technique (Corsini et al., 2003). The test-cases under scrutiny are the transitional flow on a flat plate with circular leading edge (T3L ERCOFTAC-TSIG), and the flow around a DCA compressor cascade in quasi off-design condition (i = −1.5°) (Zierke and Deutch, 1989). The comparison between computations and experiments shows a satisfactory performance of the HJ model in predicting complex turbomachinery flows. The EBM also exhibits a fair level of accuracy, though it is less satisfactory in transition prediction. In view of its robustness, relative insensitivity to the grid refinement and the absence of topology-dependent parameters, the EBM is identified as an attractive second-moment closure option for computation of complex 3D turbulent flows in realistic turbomachinery configurations.
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7

Chen, Hamn-Ching, Yong-Jun Jang, and Je-Chin Han. "Computation of Flow and Heat Transfer in Rotating Two-Pass Square Channels by a Reynolds Stress Model." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-174.

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A multiblock numerical method has been employed for the calculation of three-dimensional flow and heat transfer in rotating two-pass square channels with smooth walls. The finite-analytic method solves Reynolds-Averaged Navier-Stokes equations in conjunction with a near-wall second-order Reynolds stress (second-moment) closure model and a two-layer k–ε isotropic eddy viscosity model. Comparison of second-moment and two-layer calculations with experimental data clearly demonstrate that the secondary flows in rotating two-pass channels have been strongly influenced by the Reynolds stress anisotropy resulting from the Coriolis and centrifugal buoyancy forces as well as the 180° wall curvatures. The near-wall second-moment closure model provides the most reliable heat transfer predictions which agree well with measured data.
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Jakirlic´, S., and R. Jester-Zu¨rker. "Convective Heat Transfer in Wall-Bounded Flows Affected by Severe Fluid Properties Variation: A Second-Moment Closure Study." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30729.

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Different flow configurations subjected to increasingly enhanced wall heating were selected to be computationally investigated by means of a differential, near-wall second-moment closure model based on the solution of transport equations for second moments of the fluctuating velocities and temperature, ui″uj″͠ and ui″θ͠ respectively. Both Reynolds stress model and heat flux model represent wall-topography free formulations with quadratic pressure-strain term and pressure-temperature-gradient correlation. The transport equations for the turbulent stress tensor and the turbulent heat flux are solved in conjunction with the equation governing a new scale supplying variable, so-called “homogeneous” dissipation rate, Jakirlic and Hanjalic (2002). Such an approach offers a number of important advantages: proper near-wall shape of the dissipation rate profile was obtained without introducing any additional term and the correct asymptotic behaviour of the stress dissipation components by approaching the solid wall is fulfilled automatically without necessity for any wall geometry-related parameter. The configurations considered include fully-developed and developing flows in channel (without and with a sudden expansion) and pipe in conjunction with the scalar transport under conditions of variable fluid properties for which an extensive experimental and numerical (DNS and LES) reference database exists.
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Jang, Yong-Jun, Hamn Ching Chen, and Je-Chin Han. "Flow and Heat Transfer in a Rotating Square Channel With 45° Angled Ribs by Reynolds Stress Turbulence Model." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0229.

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Numerical predictions of three -dimensional flow and heat transfer are presented for a rotating square channel with 45° angled ribs as tested by Johnson et al. (1994). The rib height-to-hydraulic diameter ratio (e/Dh) is 0.1 and the rib pitch-to-height ratio (P/e) is 10. The cross-section of the ribs has rounded edges and corners. The computation results are compared with Johnson’s et al. (1994) experimental data at a Reynolds number (Re) of 25,000, inlet coolant-to-wall density ratio (Δρ/ρ) of 0.13, and three rotation numbers (Ro) of 0.0, 0.12, 0.24. A multi-block numerical method has been employed with a near-wall second-moment turbulence closure model. In the present method, the convective transport equations for momentum, energy, and turbulence quantities are solved in curvilinear, body-fitted coordinates using the finite-analytic method. Pressure is computed using a hybrid SIMPLER/PISO approach, which satisfies the continuity of mass and momentum simultaneously at every time step. The second-moment solutions show that the secondary flows induced by the angled ribs, rotating buoyancy, and Coriolis forces produced strong non-isotropic turbulent stresses and heat fluxes that significantly affected flow fields and surface heat transfer coefficients. The present near-wall second-moment closure model provided an improved flow and heat transfer prediction.
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Dmitrenko, A., and A. Dmitrenko. "Film cooling in nozzles with the large geometric expansion using method of integral relations and second moment closure model for turbulence." In 33rd Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-2911.

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Reports on the topic "Second moment closure model"

1

Girimaji, Sharath S. Second Moment Closure Modeling of Complex Turbulent Flows. Fort Belvoir, VA: Defense Technical Information Center, December 2007. http://dx.doi.org/10.21236/ada481844.

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2

Singh, Abhyudai, and Joao P. Hespanha. Moment Closure for the Stochastic Logistic Model. Fort Belvoir, VA: Defense Technical Information Center, January 2006. http://dx.doi.org/10.21236/ada458857.

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