3 edition of Vortical dissipation in two-dimensional shear flows found in the catalog.
Vortical dissipation in two-dimensional shear flows
W. Clifton Horne
by National Aeronautics and Space Administration, Ames Research Center, For sale by the National Technical Information Service in Moffett Field, Calif, [Springfield, Va
Written in English
|Other titles||Vortical dissipation in two dimensional shear flows.|
|Statement||W. Clifton Horne, Krishnamurty Karamcheti.|
|Series||NASA technical memorandum -- 89408.|
|Contributions||Karamcheti, Krishnamurty., Ames Research Center.|
|The Physical Object|
|Pagination||iv, 18 p.|
|Number of Pages||18|
The boundary-layer approximation models the dominate effects of refraction, radiation, scattering, and dissipation of waves by shear currents and turbulence through the combination of the kinematic condition for the rotational velocity (Equation 8) and the vortical pressure term (P) in the normal stress condition (Equation 11). The generation. Direct numerical simulation (DNS) is used to examine low Froude number free-surface turbulence (FST) over a two-dimensional mean shear flow. The Navier–Stokes equations are solved using a finite-difference scheme with a grid resolution of separate simulations are conducted to calculate the statistics of the flow.
The vortical motion is modeled in the potential flow framework, in which the oscillating motion of the thin shear layer is described by an array of convected point vortices, and the unsteady vortex shedding is determined by the Kutta condition. Shear center. For a given structure, the shear center is the point in space at which shear force could be applied without causing torsional deformation (e.g. twisting) of the cross-section of the structure. The shear center is an imaginary point, but does not vary with the magnitude of the shear force - only the cross-section of the structure.
The structure and dynamics of the two-dimensional linear shear flow of inelastic disks at high area fractions are analyzed. The event-driven simulation technique is used in the hard-particle limit, where the particles interact through instantaneous collisions. Detached Eddy Simulation of Flows over Rough Surfaces.- Theoretical Model of the Sub-Layer Streaks and the Cycle of Near-Wall Turbulence for Application to Flow Control.- Two-dimensional turbulence on a confined domain with no-slip walls.- Conformal invariance in two-dimensional turbulence.- Statistical properties of 2D turbulence on a bounded.
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VORTICAL DISSIPATION IN TWO-DIMENSIONAL SHEAR FLOWS W. Clifton Horne and Krishnamurty Karamcheti" Ames Research Center SUMMARY An exact expression is derived for the viscous dissipation function of a real homogeneous and isotropic fluid, which has terms associated with the square of vorticity, wave radiation, and by: 1.
COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.
As preparation, the first three chapters of the book provide background knowledge for entering vortical flows. The rest of the book deals with vortices and vortical flows, following their natural.
Two-dimensional shear flows continuously forced in the presence of dissipative effects are studied by means of numerical simulations. In contrast with most previous studies, the forcing is confined in a finite region, so the behavior of the system is characterized by Author: A.
López Zazueta, L. Zavala Sansón. dimensional flows: two-dimensional flows are characterized by a spectral flux of kinetic energy to larger length scales (inverse energy cascade), leading to the self-organization of the flow.
Indeed, satellite observations have revealed the presence of large-scale vorticalCited by: 2. In order to reduce difficulties in computations, we study the effect of two-dimensional shear flows which are bounded in two parallel walls introducing viscous effects to dissipate disturbances induced by the presence of the cylinder.
Shown in Figure 1, the shear flow with an arbitrary velocity profile u(y) far upstream passes a. Existence of inverse cascade, that is, the generation of large scale vortical flows from small scale flows is demonstrated. At the same time, we also show the appearance of dynamic, molecular‐level shear heating effects, which heats up the shear layer and thus altering the strong coupling parameter.
Konrad, J. An experimental investigation of mixing in two-dimensional turbulent shear flows with applications to diffusion-limited chemical reactions. Ph.D. thesis, Graduate Aeronautical Laboratories, California Institute of Technology.
A computational study of spatially evolving two-dimensional free shear flows has been performed using direct numerical simulation of the Navier–Stokes equations in order to investigate the ability of these two-dimensional simulations to predict the overall flow-field quantities of the corresponding three-dimensional “real” turbulent flows.
The effects of inflow forcing on these two. The principal notions of stability of parallel shear flows appear to be consistent with maximum dissipation conditions on the growth of vortical disturbances. These observations are consistent with Prigogine's [14,15] distinction between stable thermodynamic states or processes which are cither linear and near equilibrium, or nonlinear and far.
In a shear flow, momentum is transferred from the region of high velocity to that of low velocity. The fluid tends to resist the shear associated with the transfer of momentum. The shear stress is proportional to the rate of transfer of momentum.
In turbulent flows, the apparent shear. Evolution and convection of large-scale structures in supersonic reattaching shear flows.
Physics of Fluids, Vol. 11, No. Two-dimensional shear-layer entrainment and interface-length measurements. Dilatation dissipation: The concept and application in modeling compressible mixing layers. For two-dimensional, transverse dunes, several studies have postulated how spanwise vortex lines in the shear layer near reattachment may grow unstable, developing a three-dimensional hairpin-like.
Three-dimensional flows can have toroidal motion, the component of motion associated with rotation about a vertical axis and strike-slip motion, whereas 2-D flows (in a vertical plane) cannot. In steady-state 2-D flows the streamlines (particle paths) are always closed, but in 3-D the presence of toroidal motion can cause chaotic, space-filling.
The 36 forms of the acoustic wave equation derived in an earlier review (Campos, L. C.,“On 36 Forms of the Acoustic Wave Equation in Potential Flows and Inhomogeneous Media,” Appl. Mech. Rev., 60, pp. –) were grouped in four classes, of which the last (Class IV) concerned sheared mean flows; another type of vortical flow is swirling flow, and thus the present review.
two-dimensional perturbations which grow the most in L2 and energy norms for plane Poiseuille and Couette flow carried out by Farrell14 showed the Reynolds stress mech- anism to be responsible for rapid transient growth in ex- ponentially stable two-dimensional viscous shear flow.
Shear Stabilization of Miscible Displacement Processes in Porous Media, with A.M. Rogerson, Phys. Fluids A 5, p. Rogerson_and_Meiburg_a ; On the Motion of Small Spherical Bubbles in Two-Dimensional Vortical Flows, with G.R.
Ruetsch, Phys. Fluids A 5, p. Ruetsch_and_Meiburg_ CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): We explore a two-dimensional dynamical system modeling transition in shear flows to try to understand the nature of an ’edge ’ state.
The latter is an invariant set in phase space separating the basin of attraction B of the laminar state into two parts distinguished from one another by the nature of relaminarizing. A class of quasi two-dimensional (Q2D) flows can be defined 1 in physical terms as flows whose approximate two-dimensionality is due to the presence of flat boundaries (bottom and/or top) so that vertical velocity component is negligible.
However the vertical dependence of horizontal velocity is essential in that it provides most of the. Abstract. We study scaling laws of stratified shear flows by performing high-resolution numerical simulations of inviscid compressible turbulence. Two-dimensional excitation of the shear flow is achieved by acoustic means.
A single 8 in. diameter loudspeaker, connected by a constant-cross-sectional-area transition piece to a transverse slot in the floor at the beginning of the test section is capable of generating two-dimensional disturbances of any desired frequency in the range of.A two-dimensional numerical simulation of the parasitic capillary waves that form on a 5 cm gravity-capillary wave is performed.
A robust numerical algorithm is developed to simulate flows with complex boundary conditions and topologies. The free-surface boundary layer is resolved at the full-scale Reynolds, Froude, and Weber numbers.Vortical mode Plane internal gravity waves Spatial structure of time-periodic waves Two-dimensional vertical slice model Zonal pseudomomentum of internal waves Lagrangian and Eulerian pseudomomentum Forcing and dissipation of pseudomomentum Mountain lee waves and drag force