Numerical and physical modeling of a low-velocity air flow in a channel with a circular vortex cell

Исаев, С. А.; Guvernyuk, S. V.; Zubin, M. A.; Prigorodov, Yu. S.

doi:10.1007/bf02681739

Cited by 17 publications

(12 citation statements)

References 3 publications

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“…A large step toward increasing the quality of the numerical simulation of turbulent separation flows on intersecting multiblock grids was made when the model of shear-stress transfer was approved. This model was verified in the process of solving the problem on an air flow in plane-parallel and extending channels with a circular vortex cell on one of the walls [8,9], the problem on a steady flow around a transversal cylinder with a separating plate [10], and the problem on the turbulent heat exchange in the neighborhood of a shallow spherical hole on a plane [11]. The problem on the oscillations of a physical pendulum in a cavity filled with an incompressible fluid was solved with the use of sliding grids [12].…”

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confidence: 99%

Comparative analysis of the calculation data on an unsteady flow around a circular cylinder obtained using the VP2/3 and fluent packages and the Spalart-Allmaras and Menter turbulence models

Исаев¹,

Baranov²,

Kudryavtsev³

et al. 2005

J Eng Phys Thermophys

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An unsteady flow around a transversal circular cylinder has been analyzed on the basis of solution of Navier-Stokes and Reynolds equations, closed, in the latter case, using one-and two-parameter differential models of turbulence, by the implicit factorized method with the use of different-density structured and nonstructured grids. Solvers of specialized multiblock and universal packages have been tested.Introduction. Modern computational technologies for solving various thermophysical and aerohydrodynamical problems are characterized by the following factors: a) packages are used at the industrial stage of numerical simulation, b) calculations are paralleled with the use of multiprocessors, which is considered as the most economical way of increasing the computational efficiency, and c) different-scale problems are represented on multiblock grids, which is considered as the most rational method of solving such problems [1]. In the present numerical investigation, we considered the genesis of multiblock computational technologies [2] based on solution of Navier-Stokes and Reynolds equations by the factorized implicit method on a set of intersecting different-scale grids, including sliding ones, used for solving the classical problems on unsteady laminar and turbulent flows around a circular cylinder. Prominence was given to the comparative analysis of the specialized package VP2/3, developed on the basis of multiblock computational technologies, with the known universal package FLUENT [3]. Estimation of the acceptability of two semiempirical models of turbulence -the one parameter Spalart-Allmaras model of eddy viscosity (SA) [4] and the two-parameter Menter zonal model of shear-stress transfer (MSST) [5] -has also been the subject of the present investigation.As is known, the progress made in computational hydrodynamics in the last few decades is comparable to the progress made in the classical sciences over several centuries. These advances resulted from the rapid development of computational engineering; mathematical models of turbulence, combustion, radiative heat exchange, and others; and efficient numerical methods. Comparatively recently (in the lifetime of one generation -in the late 1960s-early 1970s), application programs written in one of the algorithmic programming languages (ALGOL or FORTRAN most often) served as the information basis of calculations. These programs were activated in large (BESM6 or CDC7600) computers in centers of collective use, and the results obtained were processed practically by hand.Today, at the industrial stage of development of computational hydrodynamics [6], application programs comprise universal and specialized packages representing complex multicomponent intelligence systems written, as a rule, in object-oriented programming languages and having a "triad" structure: grid generator-solver-graphic data interpreter. A package involves catalogs of mathematical models and data of controlling physical processes, from elements of which a desired problem is formed. Packages a...

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confidence: 99%

Comparative analysis of the calculation data on an unsteady flow around a circular cylinder obtained using the VP2/3 and fluent packages and the Spalart-Allmaras and Menter turbulence models

Исаев¹,

Baranov²,

Kudryavtsev³

et al. 2005

J Eng Phys Thermophys

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“…This computational complex was used to calculate a fairly wide range of eddy flows close in structure to the flow past a trench treated by us. For example, a numerical study was made in [10,11] of a two-dimensional turbulent flow in plane-parallel and diverging channels with a circular trench which accommodates a rotating cylinder (one of the options of the active convection cell in [12]). Calculations of three-dimensional flow past a spherical dimple on a plane wall and on the wall of a narrow channel were performed in [13,14].…”

Section: Computing Methodsmentioning

confidence: 99%

Numerical simulation of hydrodynamics and heat transfer under conditions of turbulent transverse flow past a ?trench? on a plane surface

2005

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Results are given of numerical simulation of hydrodynamics and heat transfer under conditions of transverse flow past a two-dimensional "trench" (a groove whose cross section has the form of a segment of circle) located on a plane isothermal surface. The calculations are performed for an incompressible liquid within two-dimensional Reynolds equations closed with the aid of the Menter and Spalart-Allmares turbulence models using multiblock overlapping grids. Detailed analysis is performed of the effect of the trench depth on the flow structure (configuration of separated-flow regions) and on the distribution of friction, pressure, and heat fluxes along the surface subjected to flow.

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“…In spite of the fact that from the theoretical point of view the mathematical model fully describes the operation of the construction, the results of any numerical studies require comparisons with the results of field studies [17]. Therefore, in parallel to several series of numerical calculations [10], the team of authors carried out a number of full-scale surveys of different types of enclosing structures in different climatic zones (Moscow, Tver, St. Petersburg, Murmansk, Novosibirsk, Petropavlovsk-Kamchatsky).…”

Section: Advances In Engineering Research Volume 133mentioning

confidence: 99%

Moisture condition of building materials in different operating conditions

Gagarin¹,

Pavlenko²,

PASTUSHKOV

et al. 2017

Proceedings of the International Conference "Actual Issues of Mechanical Engineering" 2017 (AIME 2017)

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-The definition of the concepts of theoretical and operating moisture of building materials is given in the paper. The estimated moisture is determined. To determine operating moisture, the analysis methods are used. The issues with the estimated moisture based on field studies are presented. Methods of calculating moisture of building materials by sorption isotherm are proposed. Literature and regulations on the use of mathematical methods for calculating moisture conditions are described in the article. Links to the relevant regulations to determine the procedures necessary for numerical calculations of the moisture properties of building materials are provided in the paper. A new formula for operating moist calculation basing on the results of field studies of moisture in the enclosing structures is presented in the article. The article describes the results of fullscale, numerical and laboratory studies to determine the estimated moisture of building materials. Discrepancy of field study results and laboratory data is revealed; thereby, inadequacy of the method of calculated moisture of building materials by sorption isotherm is proved. A good convergence of results of numerical and field investigations, which show the validity of application of the mathematical method when determining the estimated moisture content in building materials, are presented.

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Numerical and physical modeling of a low-velocity air flow in a channel with a circular vortex cell

Cited by 17 publications

References 3 publications

Comparative analysis of the calculation data on an unsteady flow around a circular cylinder obtained using the VP2/3 and fluent packages and the Spalart-Allmaras and Menter turbulence models

Comparative analysis of the calculation data on an unsteady flow around a circular cylinder obtained using the VP2/3 and fluent packages and the Spalart-Allmaras and Menter turbulence models

Numerical simulation of hydrodynamics and heat transfer under conditions of turbulent transverse flow past a ?trench? on a plane surface

Moisture condition of building materials in different operating conditions

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