Author: Publisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 14
Book Description
Numerical Simulations of Three-dimensional Laminar Flow Over a Backward Facing Step
Author: Numerical Simulations of Three-dimensional Laminar Flow Over a Backward Facing Step; Flow Near Side Walls
Author: Direct Numerical Simulation of Turbulent Flow Over a Backward-facing Step
Author: Michal Andrzej KoperaPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A three-dimensional, turbulent flow in a channel with a sudden expansion was studied by direct numerical simulation of the incompressible Navier-Stokes equations. The objective of this study was to provide statistical data of backwardfacing step flow for turbulence modelling. Additionally, analysis of the statistical and dynamical properties of the flow is performed. The Reynolds number of the main simulation was Reh = 9000, based on the step height and mean inlet velocity, with the expansion ratio ER = 2:0. The discretisation is performed using the spectral/hp element method with stiffly-stable velocity correction scheme for time integration. The inlet boundary condition is a fully turbulent velocity and pressure field regenerated from a plane downstream of the inlet. A constant flowrate was ensured by applying Stokes flow correction in the inlet regeneration area. Time and spanwise averaged results revealed, apart from the primary recirculation bubble, secondary and tertiary corner eddies. Streamlines show an additional small eddy at the downstream tip of the secondary corner eddy, with the same circulation direction as the secondary vortex. The analysis of the 3D, timeonly average shows the wavy spanwise structure of both primary and secondary recirculation bubble, that results in spanwise variations of the mean reattachment location. The visualisation of spanwise averaged pressure uctuations and streamwise velocity showed that the interaction of vortices with the recirculation bubble is responsible for the apping of the reattachment position. The characteristic frequency St = 0:078 was found. The analysis of small-scale energy transfer was performed to reveal large backscatter regions in strong Reynolds stress areas in the mixing layer. High correlation of small-scale transfer with non-linear interaction of large-scale velocity and small-scale vorticity was found. The data of the flow fields was archived. It contains the averages for velocities, pressure and Reynolds stress tensor, as well as 3D instantaneous pressure and velocity history.
Numerical Simulation in Fluid Dynamics
Author: Michael GriebelPublisher: SIAM
ISBN: 0898713986
Category : Mathematics
Languages : en
Pages : 222
Book Description
In this translation of the German edition, the authors provide insight into the numerical simulation of fluid flow. Using a simple numerical method as an expository example, the individual steps of scientific computing are presented: the derivation of the mathematical model; the discretization of the model equations; the development of algorithms; parallelization; and visualization of the computed data. In addition to the treatment of the basic equations for modeling laminar, transient flow of viscous, incompressible fluids - the Navier-Stokes equations - the authors look at the simulation of free surface flows; energy and chemical transport; and turbulence. Readers are enabled to write their own flow simulation program from scratch. The variety of applications is shown in several simulation results, including 92 black-and-white and 18 color illustrations. After reading this book, readers should be able to understand more enhanced algorithms of computational fluid dynamics and apply their new knowledge to other scientific fields.
Instability, Transition, and Turbulence
Author: M.Y. HussainiPublisher: Springer Science & Business Media
ISBN: 1461229561
Category : Science
Languages : en
Pages : 626
Book Description
This volume contains the proceedings of the Workshop on In stability, Transition and Turbulence, sponsored by the Institute for Computer Applications in Science and Engineering (ICASE) and the NASA Langley Research Center (LaRC), during July 8 to August 2, 1991. This is the second workshop in the series on the subject. The first was held in 1989, and its proceedings were published by Springer-Verlag under the title "Instability and Transition" edited by M. Y. Hussaini and R. G. Voigt. The objectives of these work shops are to i) expose the academic community to current technologically im portant issues of transition and turbulence in shear flows over the entire speed range, ii) acquaint the academic community with the unique combination of theoretical, computational and experimental capabilities at LaRC and foster interaction with these capabilities, and iii) accelerate progress in elucidating the fundamental phenomena of transition and turbulence, leading to improved transition and turbulence modeling in design methodologies. The research areas covered in these proceedings include receptiv ity and roughness, nonlinear theories of transition, numerical simu lation of spatially evolving flows, modelling of transitional and fully turbulent flows as well as some experiments on instability and tran sition. In addition a one-day mini-symposium was held to discuss 1 recent and planned experiments on turbulent flow over a backward facing step.
Direct Numerical Simulation of Turbulent Flow Over a Backward-facing Step
Author: Stanford University. Thermosciences Division. Thermosciences DivisionPublisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 250
Book Description
Laminar Backward-facing Step Flow Using the Finite Element Method
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 16
Book Description
Laminar, incompressible flow over a backward-facing step is calculated using a finite element spatial discretization with a piecewise continuous pressure approximation and an explicit time marching algorithm. The time-accurate evolution to steady state is demonstrated for both two-dimensional (2D) and three-dimensional (3D) simulations. This approach is shown to accurately predict the lengths of the recirculation zone on the top wall and at the step for various meshes and domain lengths, for a Reynolds number of 800 based on the average inlet velocity and twice the inlet channel height. The instantaneous and steady-state results are investigated. The steady-state solutions are evaluated by comparison to published numerical and experimental results.
NASA Technical Memorandum
Author: Numerical Simulation of Two-dimensional Laminar Fluid Flow Over a Downstream-facing Step with Variable Properties and Heat Transfer
Author: Jason N. PappalexisThe CFD Triathlon--three Laminar Flow Simulations by Commercial CFD Codes
Author: Christopher J. FreitasPublisher:
ISBN:
Category : Science
Languages : en
Pages : 90
Book Description
Three different laminar flow problems are studied in this volume, which presents a forum held at the June 1993 ASME Fluids Engineering Conference. The first flow is a steady, two-dimensional flow, i.e., the low Reynolds number flow over a backward facing step. The second flow is an unsteady, two-dimensional flow, i.e., the low Reynolds number flow about a unit cylinder. The third flow is an unsteady, three-dimensional flow, i.e., the shear-driven cavity flow. No index. Acidic paper. Annotation copyright by Book News, Inc., Portland, OR