The Initialization of Vortical Free-Surface Flows

1994 ◽  
Vol 116 (1) ◽  
pp. 95-102 ◽  
Author(s):  
D. G. Dommermuth
Keyword(s):  
Free Surface ◽  
Numerical Simulations ◽  
High Frequency ◽  
Free Surface Flows ◽  
Dispersive Waves ◽  
Surface Flows ◽  
Sensing Applications ◽  
Remote Sensing Applications ◽  
High Frequency Waves ◽  
Hydrostatic Balance

Numerical simulations of vortical free-surface flows are prone to developing spurious high-frequency dispersive waves unless the flow field is given sufficient time to adjust. At low Froude numbers, the high-frequency waves obscure the true hydrostatic balance of the free-surface elevation with the component of the pressure that is induced by the vortical portion of the flow. The high-frequency waves must be eliminated for remote sensing applications because otherwise the roughening of the free surface and the predicted radar backscatter will be incorrect. A procedure is developed for reducing the initial impulse of the pressure and the subsequent generation of high-frequency waves. Numerical simulations of whirls illustrate the effectiveness of the procedure. The pressure field of the whirls forms dimples on the free surface.

Numerical Simulations of Highly Nonlinear Steady and Unsteady Free Surface Flows

2011 ◽  
Vol 23 (6) ◽  
pp. 683-696 ◽  
Author(s):  
Chi Yang ◽  
Fuxin Huang ◽  
Lijue Wang ◽  
De-cheng Wan
Keyword(s):  
Free Surface ◽  
Numerical Simulations ◽  
Free Surface Flows ◽  
Surface Flows ◽  
Highly Nonlinear

Numerical Simulation of Free-Surface Turbulence

1994 ◽  
Vol 47 (6S) ◽  
pp. S163-S165
Author(s):  
Douglas G. Dommermuth ◽  
Rebecca C. Y. Mui
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Free Surface ◽  
Numerical Simulations ◽  
Free Surface Flows ◽  
Direct Numerical Simulations ◽  
Large Eddy Simulations ◽  
Surface Flows ◽  
Large Eddy ◽  
Free Surface Turbulence

Direct numerical simulations and large-eddy simulations of turbulent free-surface flows are currently being performed to investigate the roughening of the surface, and the scattering, radiation, and dissipation of waves by turbulence. The numerical simulation of turbulent free-surface flows is briefly reviewed. The numerical, modeling, and hardware issues are discussed.

scholarly journals An Elementary Study of SPH-Based Simulations for Free Surface Flows With Gravity and Compressibility Effects in Cylindrical Confinement

2009 ◽  
Author(s):  
Guillaume Oger ◽  
Erwan Jacquin ◽  
David Le Touze ◽  
Bertrand Alessandrini ◽  
Jean-Franc¸ois Sigrist
Keyword(s):  
Free Surface ◽  
High Frequency ◽  
Seismic Analysis ◽  
Three Dimensional ◽  
Low Frequency ◽  
Free Surface Flows ◽  
Frequency Range ◽  
Surface Flows ◽  
Particle Hydrodynamics ◽  
Compressibility Effects

The design of nuclear pressure vessel requires the description of various dynamic effects, among which fluid-structure interaction. In some configurations, gravity effects (in the low frequency range) and compressibility effects (in the high frequency range) are of paramount importance and have therefore to be accounted for. The present paper is concerned with the description of free surface flows with gravity and compressibility effects, using a SPH (Smoothed Particle Hydrodynamics) method in circular confinement, with expected applications to the dynamic analysis of auxiliary nuclear component for naval propulsion. For the system under concern, the range of dynamic solicitation extends from low frequency (for seismic analysis of grounded prototype) to high frequency (for shock analysis of embarked reactors); it is therefore of particle interest to employ a numerical techniques which allows the description of linear and non-linear free surface effects, which can be expected in both cases. SPH method gives promising perspective for simulation of sloshing flows in various configurations; the present paper investigates the use of such a technique in the context of three-dimensional problems with cylindrical confinement.

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