oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
On the Navier-Stokes equations with rotating effect and prescribed outflow velocity  [PDF]
Tobias Hansel
Mathematics , 2009, DOI: 10.1007/s00021-010-0026-x
Abstract: We consider the equations of Navier-Stokes modeling viscous fluid flow past a moving or rotating obstacle in $\R^d$ subject to a prescribed velocity condition at infinity. In contrast to previously known results, where the prescribed velocity vector is assumed to be parallel to the axis of rotation, in this paper we are interested in a general outflow velocity. In order to use $L^p$-techniques we introduce a new coordinate system, in which we obtain a non-autonomous partial differential equation with an unbounded drift term. We prove that the linearized problem in $\R^d$ is solved by an evolution system on $L^p_{\sigma}(\mathbb R^d)$ for $1
A pseudospectral quadrature method for Navier-Stokes equations on rotating spheres  [PDF]
M. Ganesh,Q. T. Le Gia,I. H. Sloan
Mathematics , 2010,
Abstract: In this work, we describe, analyze, and implement a pseudospectral quadrature method for a global computer modeling of the incompressible surface Navier-Stokes equations on the rotating unit sphere. Our spectrally accurate numerical error analysis is based on the Gevrey regularity of the solutions of the Navier-Stokes equations on the sphere. The scheme is designed for convenient application of fast evaluation techniques such as the fast Fourier transform (FFT), and the implementation is based on a stable adaptive time discretization.
Lp-Theory of the Navier-Stokes Flow in the Exterior of a Moving or Rotating Obstacle
M. Geissert,M. Hieber
ACTA MATHEMATICA UNIVERSITATIS COMENIANAE , 2007,
Abstract: In this paper we describe two recent approaches for the Lp-theory of the Navier-Stokes flow in the exterior of a moving or rotating obstacle.
Navier-Stokes equations on a rapidly rotating sphere  [PDF]
Djoko Wirosoetisno
Mathematics , 2013,
Abstract: We extend our earlier \beta-plane results [al-Jaboori and Wirosoetisno, 2011, DCDS-B 16:687--701] to a rotating sphere. Specifically, we show that the solution of the Navier--Stokes equations on a sphere rotating with angular velocity 1/\epsilon\ becomes zonal in the long time limit, in the sense that the non-zonal component of the energy becomes bounded by \epsilon M. We also show that the global attractor reduces to a single stable steady state when the rotation is fast enough.
Random dynamical systems generated by stochastic Navier--Stokes equation on the rotating sphere  [PDF]
Zdzislaw Brze?niak,Beniamin Goldys,Quoc Thong Le Gia
Mathematics , 2014,
Abstract: In this paper we first prove the existence and uniqueness of the solution to the stochastic Navier--Stokes equations on the rotating 2-dimensional sphere. Then we show the existence of an asymptotically compact random dynamical system associated with the equations.
Steady Prandtl Boundary Layer Expansion of Navier-Stokes Flows over a Rotating Disk  [PDF]
Sameer Iyer
Mathematics , 2015,
Abstract: This paper concerns the validity of the Prandtl boundary layer theory for steady, incompressible Navier-Stokes flows over a rotating disk. We prove that the Navier Stokes flows can be decomposed into Euler and Prandtl flows in the inviscid limit. In so doing, we develop a new set of function spaces and prove several embedding theorems which capture the interaction between the Prandtl scaling and the geometry of our domain.
Global well-posedness for the 3D rotating Navier-Stokes equations with highly oscillating initial data  [PDF]
Qionglei Chen,Changxing Miao,Zhifei Zhang
Mathematics , 2009, DOI: 10.2140/pjm.2013.262.263
Abstract: In this paper, we prove the global well-posedness for the 3D rotating Navier-Stokes equations in the critical functional framework. Especially, this result allows to construct global solutions for a class of highly oscillating initial data.
On the stationary Navier-Stokes flow with isotropic streamlines in all latitudes on a sphere or a 2D hyperbolic space  [PDF]
Chi Hin Chan,Tsuyoshi Yoneda
Mathematics , 2013,
Abstract: In this paper, we show the existence of real-analytic stationary Navier-Stokes flows with isotropic streamlines in all latitudes in some simply-connected flow region on a rotating round sphere. We also exclude the possibility of having a Poiseuille's flow profile to be one of these stationary Navier-Stokes flows with isotropic streamlines. When the sphere is replaced by a 2-dimensional hyperbolic space, we also give the analog existence result for stationary parallel laminar Navier-Stokes flows along a circular-arc boundary portion of some compact obstacle in the 2-D hyperbolic space. The existence of stationary parallel laminar Navier-Stokes flows along a straight boundary of some obstacle in the 2-D hyperbolic space is also studied. In any one of these cases, we show that a parallel laminar flow with a Poiseuille's flow profile ceases to be a stationary Navier-Stokes flow, due to the curvature of the background manifold.
A non-autonomous model problem for the Oseen-Navier-Stokes flow with rotating effects  [PDF]
Matthias Geissert,Tobias Hansel
Mathematics , 2010,
Abstract: Consider the Navier-Stokes flow past a rotating obstacle with a general time-dependent angular velocity and a time-dependent outflow condition at infinity. After rewriting the problem on a fixed domain, one obtains a non-autonomous system of equations with unbounded drift terms. It is shown that the solution to a model problem in the whole space case $\R^d$ is governed by a strongly continuous evolution system on $L^p_\sigma(\R^d)$ for $1
Parallel Computation of Finite Element Navier-Stokes codes using MUMPS Solver  [PDF]
Mandhapati P. Raju
International Journal of Computer Science Issues , 2009,
Abstract: The study deals with the parallelization of 2D and 3D finite element based Navier-Stokes codes using direct solvers. Development of sparse direct solvers using multifrontal solvers has significantly reduced the computational time of direct solution methods. Although limited by its stringent memory requirements, multifrontal solvers can be computationally efficient. First the performance of MUltifrontal Massively Parallel Solver (MUMPS) is evaluated for both 2D and 3D codes in terms of memory requirements and CPU times. The scalability of both Newton and modified Newton algorithms is tested.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.