Oblique penetration of solar-wind filaments into the magnetosphere

1998 ◽  
Vol 60 (4) ◽  
pp. 711-729 ◽  
Author(s):  
WENLONG DAI ◽  
PAUL R. WOODWARD
Keyword(s):  
Solar Wind ◽  
Flow Velocity ◽  
Maximum Depth ◽  
Two Dimensional ◽  
Large Excess ◽  
Magnetospheric Field

In this paper, a set of two-dimensional simulations for resistive magneto-hydrodynamical equations are performed to investigate the interaction between a solar-wind filament and the magnetosphere when the filament is obliquely oriented with respect to the direction of the magnetospheric field. Detailed pictures for the interaction are given. For typical parameters near the magnetopause, a filament with a sufficiently large excess flow velocity will penetrate into the magnetosphere, and will then be repelled back towards the magnetopause by the highly compressed and bent magnetospheric field. Finally, the filament will be smeared along the magnetospheric field near the magnetopause. When the angle is small, the filament will penetrate deeply into the magnetosphere before it is repelled back. Therefore there is a maximum depth a penetrated filament may reach into the magnetosphere. The effect of spontaneous reconnections behind a penetrating filament on the penetration appears to be negligible.

scholarly journals Two-dimensional mitral flow velocity profiles in pig models using epicardial doppler echocardiography

1994 ◽  
Vol 24 (2) ◽  
pp. 532-545 ◽  
Author(s):  
W.Yong Kim ◽  
Thue Bisgaard ◽  
Sten L. Nielsen ◽  
Jens K. Poulsen ◽  
Erik M. Pedersen ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Doppler Echocardiography ◽  
Velocity Profiles ◽  
Two Dimensional ◽  
Mitral Flow

Influence of Flow Velocity on Inception/Disappearance of Sheet Cavitation in a Two-Dimensional Convergent-Divergent Nozzle

2018 ◽  
Vol 2018.71 (0) ◽  
pp. C11
Author(s):  
Yusuke NISHIDA ◽  
Akifumi FUKUMIZU ◽  
Wakana TSURU ◽  
Satoshi WATANABE ◽  
Shinichi TSUDA ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Two Dimensional ◽  
Sheet Cavitation

Simulation of a Cantilevered Thin-Elastic Plate with Large Deformation Subjected to Axial Flow

2014 ◽  
Vol 1065-1069 ◽  
pp. 2069-2075
Author(s):  
Wei Bin Hong ◽  
Chang Qing Guo ◽  
Ye Zhou Sheng
Keyword(s):  
Flow Velocity ◽  
Large Deformation ◽  
Elastic Plate ◽  
Stokes Equations ◽  
Axial Flow ◽  
Navier Stokes ◽  
Thin Elastic Plate ◽  
Two Dimensional ◽  
Vibration Responses ◽  
Displacement Based

The instability and dynamics behavior of a cantilevered thin-elastic plate with large deformation subjected to axial flow is studied numerically. The structural dynamics equation is discretized by isoparametric displacement-based finite, and the motion of a continuous fluid domain is governed by two-dimensional incompressible viscous Navier-Stokes equations, which discretized by finite volume method. The two-dimensional numerical model of two-way fluid-structure coupling is established combined with moving mesh technology, realizing the interaction of thin-elastic plate and axial fluid. Firstly, under given different flow velocity, the stability of limit-cycle oscillations has been studied through Hopf bifurcation, time trace, vibration responses. Secondly, the fluid domain features are analyzed qualitatively by separately comparing with vorticity under given different flow velocity, and cloud diagram of pressure and velocity are also analyzed at U=3.6m/s.

Generating controllable velocity fluctuations using twin oscillating hydrofoils

2012 ◽  
Vol 713 ◽  
pp. 150-158 ◽  
Author(s):  
S. F. Harding ◽  
I. G. Bryden
Keyword(s):  
Inverse Problem ◽  
Time Series ◽  
Flow Velocity ◽  
Two Dimensional ◽  
Velocity Fluctuations ◽  
Instantaneous Flow ◽  
Vortex Model ◽  
Flow Fluctuations ◽  
Wide Range ◽  
Oscillatory Velocity

AbstractAn experiment apparatus has been previously developed with the ability to independently control the instantaneous flow velocity in a water flume. This configuration, which uses two pitching hydrofoils to generate the flow fluctuations, allows the unsteady response of submerged structures to be studied over a wide range of driving frequencies and conditions. Linear unsteady lift theory has been used to calculate the instantaneous circulation about two pitching hydrofoils in uniform flow. A vortex model is then used to describe the circulation in the wakes that determine the velocity perturbations at the centreline between the foils. This paper introduces how the vortex model can be discretized to allow the inverse problem to be solved, such that the foil motions required to recreate a desired velocity time series can be determined. The results of this model are presented for the simplified cases of oscillatory velocity fluctuations in the vertical and stream-wise directions separately, and also simultaneously. The more general case of two-dimensional aperiodic velocity fluctuations is also presented, which demonstrates the capability of configuration between the suggested frequency limits of $0. 06\leq k\leq 1. 9$.

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