A solver for time-dependent viscoelastic fluid flows

1994 ◽  
Vol 51 (3) ◽  
pp. 309-340 ◽  
Author(s):  
Fredrik Olsson
Keyword(s):  
Viscoelastic Fluid ◽  
Fluid Flows ◽  
Time Dependent

An implicit scheme for simulation of free surface non-Newtonian fluid flows on dynamically adapted grids

2021 ◽  
Vol 36 (3) ◽  
pp. 165-176
Author(s):  
Kirill Nikitin ◽  
Yuri Vassilevski ◽  
Ruslan Yanbarisov
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Newtonian Fluid ◽  
Viscoelastic Fluid ◽  
Fluid Flows ◽  
Numerical Results ◽  
Implicit Scheme ◽  
New Approach

Abstract This work presents a new approach to modelling of free surface non-Newtonian (viscoplastic or viscoelastic) fluid flows on dynamically adapted octree grids. The numerical model is based on the implicit formulation and the staggered location of governing variables. We verify our model by comparing simulations with experimental and numerical results known from the literature.

Time dependent analysis of finite buffer fluid flows and risk models with a dividend barrier

2007 ◽  
Vol 55 (4) ◽  
pp. 207-222 ◽  
Author(s):  
Soohan Ahn ◽  
Andrei L. Badescu ◽  
V. Ramaswami
Keyword(s):  
Fluid Flows ◽  
Time Dependent ◽  
Finite Buffer ◽  
Risk Models ◽  
Time Dependent Analysis

scholarly journals High Mixing Efficiency by Modulating Inlet Frequency of Viscoelastic Fluid in Simplified Pore Structure

Processes ◽  
2018 ◽  
Vol 6 (11) ◽  
pp. 210 ◽  
Author(s):  
Meng Zhang ◽  
Yunfeng Cui ◽  
Weihua Cai ◽  
Zhengwei Wu ◽  
Yongyao Li ◽  
...  
Keyword(s):  
Viscoelastic Fluid ◽  
Essential Role ◽  
Fluid Flows ◽  
Fluid Mixing ◽  
Modulation Method ◽  
Mixing Efficiency ◽  
Microscale Flow ◽  
Pressure Modulation ◽  
Active Mixing ◽  
Junction Structure

Fluid mixing plays an essential role in microscale flow systems. Here, we propose an active mixing approach which enhances the mixing of viscoelastic fluid flow in a simplified pore T-junction structure. Mixing is actively controlled by modulating the driving pressure with a sinusoidal signal at the two inlets of the T-junction. The mixing effect is numerically investigated for both Newtonian and viscoelastic fluid flows under different pressure modulation conditions. The result shows that a degree of mixing as high as 0.9 is achieved in viscoelastic fluid flows through the T-junction mixer when the phase difference between the modulated pressures at the two inlets is 180°. This modulation method can also be used in other fluid mixing devices.

scholarly journals Eddy growth and mixing in mesoscale oceanographic flows

1997 ◽  
Vol 4 (4) ◽  
pp. 223-235 ◽  
Author(s):  
G. Haller ◽  
A. C. Poje
Keyword(s):  
Direct Relationship ◽  
Kinematic Model ◽  
Fluid Flows ◽  
Time Dependent ◽  
Two Dimensional ◽  
Two Dimensional Flow ◽  
Fluid Particles ◽  
Lagrangian Tracers ◽  
Particle Paths ◽  
General Time

Abstract. We study the relation between changes in the Eulerian topology of a two dimensional flow and the mixing of fluid particles between qualitatively different regions of the flow. In general time dependent flows, streamlines and particle paths are unrelated. However, for many mesoscale oceanographic features such as detaching rings and meandering jets, the rate at which the Euierian structures evolve is considerably slower than typical advection speeds of Lagrangian tracers. In this note we show that for two-dimensional, adiabatic fluid flows there is a direct relationship between observable changes in the topology of the Eulerian field and the rate of transport of fluid particles. We show that a certain class of flows is amenable to adiabatic or near adiabatic analysis, and, as an example, we use our results to study the chaotic mixing in the Dutkiewicz and Paldor (1994) kinematic model of the interaction of a meandering barotropic jet with a strong eddy.

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