Numerical studies of nonhomogeneous fluid flows

2005 ◽  
pp. 330-361 ◽  
Author(s):  
R. Peyret
Keyword(s):  
Fluid Flows ◽  
Numerical Studies

scholarly journals Axisymmetric simulation of viscoelastic filament thinning with the Oldroyd-B model

2018 ◽  
Vol 851 ◽  
Author(s):  
Emre Turkoz ◽  
Jose M. Lopez-Herrera ◽  
Jens Eggers ◽  
Craig B. Arnold ◽  
Luc Deike
Keyword(s):  
Stress Component ◽  
Fluid Flows ◽  
Theoretical Description ◽  
Slender Body ◽  
Complex Materials ◽  
Two Phase ◽  
Practical Applications ◽  
Numerical Studies ◽  
Fundamental Understanding ◽  
The One

A fundamental understanding of the filament thinning of viscoelastic fluids is important in practical applications such as spraying and printing of complex materials. Here, we present direct numerical simulations of the two-phase axisymmetric momentum equations using the volume-of-fluid technique for interface tracking and the log-conformation transformation to solve the viscoelastic constitutive equation. The numerical results for the filament thinning are in excellent agreement with the theoretical description developed with a slender body approximation. We show that the off-diagonal stress component of the polymeric stress tensor is important and should not be neglected when investigating the later stages of filament thinning. This demonstrates that such numerical methods can be used to study details not captured by the one-dimensional slender body approximation, and pave the way for numerical studies of viscoelastic fluid flows.

scholarly journals Fluid Dynamics Experiments for Planetary Interiors

2021 ◽  
Author(s):  
Michael Le Bars ◽  
Ankit Barik ◽  
Fabian Burmann ◽  
Daniel P. Lathrop ◽  
Jerome Noir ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Laboratory Experiments ◽  
Fluid Flows ◽  
Review Article ◽  
Planetary Interiors ◽  
Numerical Studies ◽  
Long Duration ◽  
Planetary Cores ◽  
Experimental Approaches ◽  
Do So

AbstractUnderstanding fluid flows in planetary cores and subsurface oceans, as well as their signatures in available observational data (gravity, magnetism, rotation, etc.), is a tremendous interdisciplinary challenge. In particular, it requires understanding the fundamental fluid dynamics involving turbulence and rotation at typical scales well beyond our day-to-day experience. To do so, laboratory experiments are fully complementary to numerical simulations, especially in systematically exploring extreme flow regimes for long duration. In this review article, we present some illustrative examples where experimental approaches, complemented by theoretical and numerical studies, have been key for a better understanding of planetary interior flows driven by some type of mechanical forcing. We successively address the dynamics of flows driven by precession, by libration, by differential rotation, and by boundary topography.

DEM simulation of wet granular-fluid flows in spouted beds: Numerical studies and experimental verifications

2017 ◽  
Vol 318 ◽  
pp. 337-349 ◽  
Author(s):  
Huang Zhang ◽  
Shuiqing Li
Keyword(s):  
Fluid Flows ◽  
Dem Simulation ◽  
Numerical Studies ◽  
Spouted Beds ◽  
Granular Fluid

scholarly journals Numerical Studies of Disperse Three-Phase Fluid Flows

Fluids ◽  
2021 ◽  
Vol 6 (9) ◽  
pp. 317
Author(s):  
Lei Zeng ◽  
Daniel Velez ◽  
Jiacai Lu ◽  
Gretar Tryggvason
Keyword(s):  
Surface Tension ◽  
Volume Fraction ◽  
Fluid Flows ◽  
Reynolds Numbers ◽  
Unit Cell ◽  
Multiphase System ◽  
Computational Domain ◽  
Numerical Studies ◽  
Three Phase ◽  
Phase Fluid

The dynamics of a three-phase gas–liquid–liquid multiphase system is examined by direct numerical simulations. The system consists of a continuous liquid phase, buoyant gas bubbles, and smaller heavy drops that fall relative to the continuous liquid. The computational domain is fully periodic, and a force equal to the weight of the mixture is added to keep it in place. The governing parameters are selected so that the terminal Reynolds numbers of the bubbles and the drops are moderate; while the effect of bubble deformability is examined by changing its surface tension, the surface tension for the drops is sufficiently high so they do not deform. One bubble in a “unit cell” and eight freely interacting bubbles are examined. The dependency of the slip velocities, the velocity fluctuations, and the distribution of the dispersed phases on the volume fraction of each phase are examined. It is found that while the distribution of drops around a single bubble in a “unit cell” is uneven and depends on its deformability, the distribution of drops around freely interacting bubbles is relatively uniform for the parameters examined in this study.

Wave Interactions and Fluid Flows

1986 ◽  
Author(s):  
Alex D. D. Craik
Keyword(s):  
Fluid Flows ◽  
Wave Interactions

Experimental and numerical studies of radiative shocks

2006 ◽  
Vol 133 ◽  
pp. 1013-1017 ◽  
Author(s):  
C. Michaut ◽  
L. Boireau ◽  
T. Vinci ◽  
S. Bouquet ◽  
M. Koenig ◽  
...  
Keyword(s):  
Radiative Shocks ◽  
Numerical Studies
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