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

Abstract

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...

Towards Simulation of Far-Field Aerodynamic Sound from a Circular Cylinder Using OpenFoam

“…The present results of predicted sound field were found to be in good agreement with the DNS data of Inoue and Hatakeyama [8] and the data obtained by a high-order finite-difference method (HOFDM) of Müller [9]. Other integral flow features were found to be consistent with the available numerical and experimental data [25], [26], [27] and our previous results [1], [28]. Fig.…”

Numerical simulation and experiments on turbulent air flow around the semi-circular profile at zero angle of attack and moderate Reynolds number

“…In this respect, interest in this profile is to find perspective aerodynamic shapes of integrated vehicles with flow control by vortex cells [4][5][6]. The present work applies the data on flow with periodic vortex structures near a cir-cular cylinder at Re = 50000 [7][8][9] and on turbulent flow around a thin (12% of the chord) NACA0012 airfoil at small, moderate, and large angles of attack [10]. time kept from the start of the self-oscillatory cycle ∞…”

Flow-Sound Interaction Mechanism of Two Side-by-Side Cylinders in Cross-Flow

“…This is a one equation turbulent model, which was developed specifically for aerospace applications involving wall bounded flows (Spalart and Allmaras, 1994). This model has proven to be advantageous in solving boundary layers with adverse pressure gradients (Isaev et al 2005). Moreover, it is sufficiently robust for relatively crude simulations on coarse meshes, which allows the computation time to be reduced without sacrificing the accuracy of results.…”