نتایج جستجو برای: vortex panel method

تعداد نتایج: 1726580  

سید محمد علی زمردیان, , محمدرضا باقری سبزواری, ,

The vertical pipe intake is an economical structure relative to the other alternatives. VPI usually installed near the water surface and prevents from the coarse sediment entrance to the system. The strong vortex in VPI entrance is a major problem which may reduce the system efficiency. Recognizing the vortex affected parameters, helping engineers to design anti vortex structures. In this study...

Journal: :SIAM J. Scientific Computing 1993
Thomas Y. Hou John S. Lowengrub Michael J. Shelley

Expanding upon an observation of Hou [Math. Comp., submitted], exact desingularizations are presented of the Euler equations in two and three dimensions for which the singularity within the Biot-Savart integrand is reduced by one order. The reformulated equations are then solved numerically using either the point vortex method or the vortex blob method. The increased smoothness of the Biot-Sava...

1998
Thomas Y. Hou Pingwen Zhang THOMAS Y. HOU PINGWEN ZHANG

We prove convergence of a modified point vortex method for timedependent water waves in a three-dimensional, inviscid, irrotational and incompressible fluid. Our stability analysis has two important ingredients. First we derive a leading order approximation of the singular velocity integral. This leading order approximation captures all the leading order contributions of the original velocity i...

Journal: :Thermal Science 2021

In order to study the variation of vortices and heat transfer enhancement characteristics piezoelectric vibrating cantilever in liquid-cooled channels, effects fluid density viscosity, mainstream velocity, excitation voltage on were analyzed. The theoretical numerical simulation was carried out by using fluid-solid coupling method. On basis hydrodynamic function considering additional effect li...

2006
M. Usami K. Mizuguchi

The generation of vortices for the flow past a flat plate is calculated by the DSMC method. The new intermolecular collision scheme and the conventional one are compared with respect to their allowable cell dimension. In the condition of Re=50, when using the conventional scheme, the vortex behind an inclined flat plate becomes weak with increasing the cell dimension beyond the mean free path, ...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2014
J-D Debus M Mendoza H J Herrmann

We study the Dean instability in curved channels using the lattice Boltzmann model for generalized metrics. For this purpose, we first improve and validate the method by measuring the critical Dean number at the transition from laminar to vortex flow for a streamwise curved rectangular channel, obtaining very good agreement with the literature values. Taking advantage of the easy implementation...

2014
Xiaohong Zeng

The vortex of low speed flows is difficult to measure resulted in that the output signal of vortex flowmeter appears the spectral line splitting and frequency offset in the low SNR and causes the frequency resolution to be decreased. In the paper, it first conducted the multi-scale wavelet decomposition to the vortex signal with noise, then removed the noise spectrum and carried on power spectr...

2006
G. M. Wysin

Relaxation schemes for finding normal modes of nonlinear excitations are described, and applied to the vortex-spinwave scattering problem in classical two-dimensional easy-plane Heisenberg models. The schemes employ the square of an effective Hamiltonian to ensure positive eigenvalues, together with an evolution in time or a self-consistent Gauss-Seidel iteration producing diffusive relaxation....

2010
RALF MESSING MARKUS J. KLOKER M. J. Kloker

Direct numerical simulations are employed to investigate the effects of discrete suction orifices at the wall on the disturbance evolution in laminar three-dimensional boundary-layer flows with favourable pressure gradient. Suction panels with many suction orifices can excite unstable crossflow (CF) modes even if the orifice spacing is smaller than the chordwise/spanwise wavelengths of unstable...

1992
THOMAS BUTTKE PHILLIP COLELLA

The method of local corrections (MLC) developed by Anderson for two spatial dimensions is a particle-particle panicle-mesh method. in which the calculation of the velocity field induced by a collection of vortices is split into two parts: (i) a finite difference velocity field calculation using a fast Poisson solver, the results of which are used to represent the velocity field induced by vorti...

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