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Numerical study of detailed flow field and performance of Savonius wind turbines

Zhou, Tong; Rempfer, Dietmar - In: Renewable Energy 51 (2013) C, pp. 373-381

The Savonius vertical axis wind turbine is simple in structure, has good starting characteristics, relatively low operating speeds, and an ability to accept wind from any direction, although it has a lower efficiency than some other vertical axis wind turbines. So far a number of experimental...

Persistent link: https://www.econbiz.de/10010805445

Existence, stability, and scattering of bright vortices in the cubic–quintic nonlinear Schrödinger equation

Caplan, R.M.; Carretero-González, R.; Kevrekidis, P.G.; … - In: Mathematics and Computers in Simulation (MATCOM) 82 (2012) 7, pp. 1150-1171

We revisit the topic of the existence and azimuthal modulational stability of solitary vortices (alias vortex solitons … solitary vortices are recovered by means of this approach. The 1D azimuthal equation of motion is used to analyze the … modulational instability of the vortex solitons. The semi-analytical predictions – in particular, the critical intrinsic frequency …

Persistent link: https://www.econbiz.de/10011050183

Vortices in rotating Bose–Einstein condensates confined in homogeneous traps

Rindler-Daller, T. - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 8, pp. 1851-1874

We investigate analytically the thermodynamical stability of vortices in the ground state of rotating 2D Bose … contributions due to vortices. As an application, we consider a general potential of the form V(x,y)=(x2+λ2y2)s/2 with slope s∈[2 … derive the critical angular velocities for the existence of vortices and show that all vortices are single …

Persistent link: https://www.econbiz.de/10011057081