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Numerical Simulation Of The Disturbed Flow Through A Three Dimensional Building Array
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Book Synopsis Numerical Simulation of the Disturbed Flow Through a Three-Dimensional Building Array by :
Download or read book Numerical Simulation of the Disturbed Flow Through a Three-Dimensional Building Array written by and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the neutrally-stratified flow within and over an array of three-dimensional (3-D) buildings (cubes) was undertaken using simple Reynolds-averaged Navier-Stokes (RANS) flow models. These models consist of a general solution of the ensemble-averaged, steady-state, three-dimensional Navier-Stokes equations, where the k-E turbulence model (k is turbulence kinetic energy and E is viscous dissipation rate) has been used to close the system of equations. Two turbulence closure models were tested; namely, the standard and Kato-Launder k-E models. The latter model is a modified k-E model designed specifically to overcome the stagnation point anomaly in flows past a bluff body where the standard k-E model overpredicts the production of turbulence kinetic energy near the stagnation point. Results of a detailed comparison between a wind tunnel experiment and the RANS flow model predictions are presented. More specifically, vertical profiles of the predicted mean streamwise velocity, mean vertical velocity, and turbulence kinetic energy at a number of streamwise locations that extend from the impingement zone upstream of the array, through the array interior, to the exit region downstream of the array are presented and compared to those measured in the wind tunnel experiment. Generally, the numerical predictions show good agreement for the mean flow velocities. The turbulence kinetic energy was underestimated by the two different closure models. After validation, the results of the high-resolution RANS flow model predictions were used to diagnose the dispersive stress, within and above the building array. The importance of dispersive stresses, which arise from point-to-point variations in the mean flow field, relative to the spatially-averaged Reynolds stresses are assessed for the building array.
Book Synopsis Numerical Simulation of Flows Near and Through a Two-Dimensional Array of Buildings by :
Download or read book Numerical Simulation of Flows Near and Through a Two-Dimensional Array of Buildings written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical simulation has been performed of turbulent flow near and through a two-dimensional array of rectangular buildings (bluff bodies) in a neutrally stratified background flow. The model used for the simulation was the steady-state Reynolds-averaged Navier-Stokes equations with an isotropic, linear eddy viscosity formulation for the Reynolds stresses; and, the eddy viscosity was determined using a high-Reynolds number form of the kappa-epsilon turbulence-closure model with the boundary conditions at the wall obtained with the wall-function approach. The resulting system of partial differential equations along with the concomitant boundary conditions for the problem was solved using the SIMPLE algorithm in conjunction with a non-orthogonal, collocated, cell-centered, finite volume procedure. The predictive capabilities of the numerical simulation of urban flow are validated against a very detailed and comprehensive wind tunnel data set. Vertical profiles of the mean streamwise and vertical velocities and the turbulence kinetic energy are presented and compared to those measured in the wind tunnel simulation. In addition to the comparison between modeled and measured results, the numerical simulation is used to aid in the interpretation of certain features of the flow observed in the wind tunnel simulation. it is found that the overall performance of the model is good--most of the qualitative features in the disturbed turbulent flow field in and near the building array are correctly reproduced, and the quantitative agreement is also generally fairly good (especially for the mean velocity field). The underestimation of the turbulence energy levels may arise from the inability of the model to capture the subtle effects of secondary strain, especially those associated with curvature, on the turbulence.
Book Synopsis Numerical Simulation of Turbulence and Diffusion in Three-dimensional Flow by : C. J. Kau
Download or read book Numerical Simulation of Turbulence and Diffusion in Three-dimensional Flow written by C. J. Kau and published by . This book was released on 1972 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1987 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulations of Flow in a Three-dimensional Cavity-channel Geometry by :
Download or read book Numerical Simulations of Flow in a Three-dimensional Cavity-channel Geometry written by and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Numerical Simulation of Strained Three-dimensional Wall-bounded Flows by : Gary N. Coleman
Download or read book Direct Numerical Simulation of Strained Three-dimensional Wall-bounded Flows written by Gary N. Coleman and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Three-dimensional Incompressible Flow by a New Formulation by : C. J. Ho
Download or read book Numerical Simulation of Three-dimensional Incompressible Flow by a New Formulation written by C. J. Ho and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Unsteady Three Dimensional Incompressible Flows in Complex Geometries by : Hansong Tang
Download or read book Numerical Simulation of Unsteady Three Dimensional Incompressible Flows in Complex Geometries written by Hansong Tang and published by . This book was released on 2001 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Study of Three-dimensional Flow Through a Deep Open Channel - Including a Wire-mesh Segment on One Side Wall by : Chandrima Jana
Download or read book Numerical Study of Three-dimensional Flow Through a Deep Open Channel - Including a Wire-mesh Segment on One Side Wall written by Chandrima Jana and published by . This book was released on 2011 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this study is to numerically investigate the surface shear stress distribution for a deep open channel of aspect ratio 10, including a wire mesh segment on one side wall. This work is motivated by the need to understand the length-based separation process occurring in a deep open channel in the Bauer-McNett Fiber Classifier (BMC), a length-based fiber separator. The shear stress distribution governs the fiber orientation, which in turn, governs the length-based separation process. The flow through the BMC open channel is turbulent, and the flow field is expected to be characterized by turbulence-driven secondary flows. In order to compute the flow variables, the Reynolds-Averaged Navier-Stokes (RANS) equations have been solved. To close the RANS equations, a second-order closure turbulence model known as the Reynolds stress model is employed. The RANS equations are solved using a well known iterative solution procedure known as the Semi-Implicit Method for Pressure Linked Equations (SIMPLE) algorithm. The commercial CFD solver ANSYS FLUENT 13.1 is capable of solving the RANS equations using the Reynolds stress model to close the system of equations. It is also equipped with the SIMPLE algorithm, and hence, is chosen to study the flow in the BMC open channel. For any numerical study, the numerical solution procedure must be verified. Due to the similarity in its physical configuration to the open channel in the BMC apparatus, the canonical problem of fully developed turbulent flow in an open channel of aspect ratio unity is chosen as the verification case. Simulation of the square open channel case enables the verification of the computational methodology before it is applied to the present problem. Next, the flow in the BMC open channel is studied considering the vertical side boundaries as solid walls. The flow in the BMC open channel is characterized by the presence of multiple secondary velocities. The secondary flows are weaker than the primary flow. The secondary flows near the free surface are responsible for the increase in the shear stress on the side wall of the open channel. The resultant shear stress vectors in the open channel are found to be oriented in the primary flow direction. Finally, the flow in the BMC open channel considering a wire mesh on a segment of the side wall is studied. The wire mesh is represented by a 3x3 aperture array. The size of the apertures and the wire diameter corresponds to mesh 16. The shear stress distribution on the apertures is significantly lower than that on the solid wires. Also, the shear stress vectors of the fluid occupying the apertures indicate that the shear stress on the fluid is oriented at an angle to the plane of the apertures. The fibers in the flow are expected to align with the shear stress. Since the resulting shear stress vectors on the fluid occupying the apertures are oriented at an angle to the plane of the apertures, it suggests that fibers greater than the opening size of the apertures may escape through them.
Book Synopsis A 3-D Numerical Simulation of Fluid Flow Through a Porous Rectangular Duct by : Ravi Gudimetla
Download or read book A 3-D Numerical Simulation of Fluid Flow Through a Porous Rectangular Duct written by Ravi Gudimetla and published by . This book was released on 1997 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Three-dimensional Inviscid Internal Flows Using Un-factored Upwind Relaxation-sweeping Algorithm by : G.-C. Zha
Download or read book Numerical Simulation of Three-dimensional Inviscid Internal Flows Using Un-factored Upwind Relaxation-sweeping Algorithm written by G.-C. Zha and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Three-dimensional Flow Field and Local Scour at Bridge Crossings by : Xibing Dou
Download or read book Numerical Simulation of Three-dimensional Flow Field and Local Scour at Bridge Crossings written by Xibing Dou and published by . This book was released on 1997 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Three Dimensional Vortex-dominated Flows by : Abrar Hasan Mohammad
Download or read book Numerical Simulation of Three Dimensional Vortex-dominated Flows written by Abrar Hasan Mohammad and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of 3-dimensional Flow in Straight and Curved Ducts of Rectangular Cross Section by : Bo Gervang
Download or read book Numerical Simulation of 3-dimensional Flow in Straight and Curved Ducts of Rectangular Cross Section written by Bo Gervang and published by . This book was released on 1989 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Model for the Mean Wind and Turbulence Within and Above an Urban Canopy, Part I: by :
Download or read book Model for the Mean Wind and Turbulence Within and Above an Urban Canopy, Part I: written by and published by . This book was released on 2000 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, a three-dimensional (3-D) model for the disturbed mean wind flow & turbulence in an urban canopy composed of an extensive array of obstacles is developed. The context of this work is the provision of a computational tool for the rapid diagnosis of transport & dispersion of toxic contaminants (such as chemical & biological warfare agents) over a relatively homogeneous urban area. A model for disturbed mean velocity flow about an array of buildings with arbitrary packing density is formulated with the turbulence length scale designed to reproduce the known characteristics of the length scale in a canopy. A method for the partitioning of the turbulence kinetic energy into its component normal Reynolds stresses is obtained and the effect of obstacles on the flow is parameterized in terms of an effective drag parameter. Details of the numerical implementation of this model are provided along with an example of a simulation of the disturbed mean flow in an urban array.
Book Synopsis Numerical Simulation of Unsteady Three-Dimensional Turbulent Structures in Boundary Layer Flows by : Nan S. Lui
Download or read book Numerical Simulation of Unsteady Three-Dimensional Turbulent Structures in Boundary Layer Flows written by Nan S. Lui and published by . This book was released on 1985 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The capabilities for numerical simulations of the dynamical effects of the underlying structures occurring in turbulent boundary layers have been developed. A mathematically operational model of hairpin vortex, which closely resembles the experimentally observed underlying structure of wall turbulence, has been constructed and the evolution of this incipient hairpin vortex as well as the distortion of a background laminar boundary layer has been successfully simulated. The height of the incipient hairpin vortex is about 1/5 fo the local boundary layer thickness. The calculated results not only exhibit most of the prominent features associated with turbulent spots and turbulent boundary layer flows, but also reveal dynamic processes which have been very difficult to observe in experimental studies, notably, the formation and intensification of another counter rotating hairpin vortex immediately upstream of the incipient hairpin vortex. Keywords: Navier-Stokes equations; Coherent wall structure.
