【摘 要】
:
Multiple steady solutions and hysteresis phenomenon in the square cavity flows driven by the surface with antisymmet-ric velocity profile are investigated by numerical simulation and bifurcation analysis.A high order spectral element method with the matri
【机 构】
:
Institute of Applied Physical and Computational Mathematics,Beijing 100094,China;Department of Moder
论文部分内容阅读
Multiple steady solutions and hysteresis phenomenon in the square cavity flows driven by the surface with antisymmet-ric velocity profile are investigated by numerical simulation and bifurcation analysis.A high order spectral element method with the matrix-free pseudo-arclength technique is used for the steady-state solution and numerical continuation.The com-plex flow pattems beyond the symmetry-breaking at Re (~-) 320 are presented by a bifurcation diagram for Re < 2500.The results of stable symmetric and asymmetric solutions are consistent with those reported in literature,and a new unstable asymmetric branch is obtained besides the stable branches.A novel hysteresis phenomenon is observed in the range of 2208 < Re < 2262,where two pairs of stable and two pairs of unstable asymmetric steady solutions beyond the stable symmetric state coexist.The vortices near the sidewall appear when the Reynolds number increases,which correspond to the bifurcation of topology structure,but not the bifurcation of Navier-Stokes equations.The hysteresis is proposed to be the result of the combined mechanisms of the competition and coalescence of secondary vortices.
其他文献
We investigate the nonequilibrium thermodynamics of a quenched XY spin chain with multi-spin interaction in a transverse field.The analytical expressions of both the average work and the relative entropy are obtained under different quenching parameters.T
Identification of the glass formation process in various conditions is of importance for fundamental understanding of the mechanism of glass transitions as well as for developments and applications of glassy materials.We investigate the role of pinning in
We systemically investigate the nature of Ce 4f electrons in structurally layered heavy-fermion compounds CemMnIn3m+2n (with M=Co,Rh,Ir,and Pt,m =1,2,n =02),at low temperature using on-resonance angle-resolved photoemission spectroscopy.Three heavy quasip
The neutron Bragg-edge imaging is expected to be a new non-destructive energy-resolved neutron imaging technique for quantitatively two-dimensional or three-dimensional visualizing crystallographic information in a bulk material,which could be benefited f
Since the discovery of magnetism in two dimensions,effective manipulation of magnetism in van der Waals magnets has always been a crucial goal.Ionic gating is a promising method for such manipulation,yet devices gated with conven-tional ionic liquid may h
The driving mechanism of nematicity and its twist with superconductivity in iron-based superconductors are still under debate.Recently,a dominant Big-type strain effect on superconductivity is observed in underdoped iron-pnictides superconductors Ba(Fel-x
We investigate the advantage of coherent superposition of two different coded channels in quantum metrology.In a continuous variable system,we show that the Heisenberg limit 1/N can be beaten by the coherent superposition with-out the help of indefinite c
Recently,intrinsic antiferromagnetic topological insulator MnBi2Te4 has drawn intense research interest and leads to plenty of significant progress in physics and materials science by hosting quantum anomalous Hall effect,axion insulator state,and other q
The ferromagnetism of two-dimensional (2D) materials has aroused great interest in recent years,which may play an important role in the next-generation magnetic devices.Herein,a series of 2D transition metal-organic framework materials (TM-NH MOF,TM =Sc-Z
Graphene oxide membranes (GOMs),as one of the most promising novel materials,have gained great interest in the field of adsorption.However,the oxygen content of graphene oxide is directly related to its adsorption properties,such as suspension stability,a