Understanding the behavior of viscoelastic (VE) fluids in confined geometries is crucial for applications biologic systems, heat transfer devices, enhanced oil recovery, and many others. Here, we perform a systematic steady-state simulation VE fluid at low Reynolds numbers through channel with successive smooth contractions expansions. We analyze hydrodynamic performance particular attention to...

Viscoelasticity weakens the asymmetry of laminar shedding flow behind a blunt body in free domain. In present study, this finding is confirmed by four unsteady viscoelastic flows with asymmetric configuration, i.e., over an inclined flat plate various angles incidence, rotating circular cylinder, cylinder slip boundary distribution, and row eight equally closely spaced cylinders (which can be c...

Abstract A fully coupled high order discontinuous Galerkin (DG) solver for viscoelastic Oldroyd B fluid flow problems is presented. Contrary to known methods combining DG the discretization of convective terms material model with standard finite element (FEM) and using elastic viscous stress splitting (EVSS) its derivatives, a local (LDG) formulation first described hyperbolic convection‐diffus...

We present a numerical study of a stabilization method for computing confined and free-surface flows of highly elastic viscoelastic fluids. In this approach, the constitutive equation based on the conformation tensor, which is used to define the viscoelastic model, is modified introducing an evolution equation for the square-root conformation tensor. Both confined and free-surface flows are con...

We consider the dynamics of a polymer with finite extensibility placed in a chaotic flow with large mean shear, to explain how the polymer statistics changes with Weissenberg number, Wi , the product of the polymer relaxation time and the Lyapunov exponent of the flow, λ̄. The probability distribution function (PDF) of the polymer orientation is peaked around a shear-preferred direction, having ...

We report experimental discovery of a localized structure, which is of a new type for dissipative systems. It appears as a solitary vortex couple (”diwhirl”) in Couette flow with highly elastic polymer solutions. A unique property of the diwhirls is that they are stationary, in contrast to the usual localized wave structures in both Hamiltonian and dissipative systems which are stabilized by wa...

The dynamic behaviours of a filament in viscoelastic uniform flow were investigated by an immersed boundary-lattice Boltzmann method. effects the Reynolds numbers (Re, ranging from 10 to 200) and Weissenberg number (Wi, 0 1.2) on flapping motion drag lift coefficients studied. It was found that higher inertial effect (larger Re) promotes filament. In addition, major viscoelasticity Giesekus flu...

The displacement flow of an organic Newtonian fluid by a pure viscoelastic aqueous solution is experimentally investigated inside circular microchannel 200 μm. Displacement commonly encountered in many industrial applications, from cleaning and decontamination to enhanced oil recovery. In this study, with no shear-thinning properties (known as Boger fluid) made up polyethylene oxide, glycol, zi...