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Showing 1 to 20 of 36 for “"Viscoelastic fluid"”.
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A Spectral Element Method for Viscoelastic Fluid Flow
… for solving incompressible Newtonian flows and viscoelastic flows of non-Newtonian fluids. In the numerical simulation of the incompressible Newtonian fluid in two dimensions, the spectral element approximations of the Stokes and Navier-Stokes equations are established, based on the primitive …
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Translation of two contacting spheres in a viscoelastic fluid
Thesis (Ph. D.)--Michigan State University. Dept. of Chemical Engineering, 1983
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Viscoelastic Fluid Modeling for Geophysical Applications in an Eulerian Framework
… on long timescales, motivating the use of viscoelastic models for intermediate regimes. Such models are essential for capturing both stress accumulation and permanent deformation but are highly nonlinear and numerically challenging. Classical approaches in geophysical viscoelastic modeling …
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Viscoelastic Fluid Flow Past a Submerged Spheroidal Body (Birefringence, Free Energy)
… homogeneous axisymmetric flow of a third order fluid past a spheriodal body. The numerical solution was shown to agree well with existing analytical solutions for several limiting cases (such as flow past a sphere), and was used to investigate the effects of the (a) body shape, (b) free stream …
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Computational analysis of viscoelastic fluid dynamics with applications to heat exchangers
… the computational analysis of a pressure driven viscoelastic fluid in a double pipe heat exchanger set-up is investigated. Non-Newtonian viscoelastic fluids in heat exchanger arrangements are encountered in various industrial applications such as power generation, refrigeration and in the food …
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Modeling a two-link rigid swimmer scalloping in linear viscoelastic fluid
… of two links cannot swim in a viscous Newtonian fluid due to the reciprocal nature of its movements. Viscoelastic fluid, on the other hand, has a characteristic time scale associated with stress relaxation and can impart asymmetrical stresses on the body of a swimmer to propel it forward. This …
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Finite element methods for the time dependent simulation of viscoelastic fluid flows
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1996.
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Controllability of the Stresses in Multimode Viscoelastic Fluid of Upper Convected Maxwell Type
Viscoelastic fluids, or Non-Newtonian fluids, are those that do not have a linear algebraic relation between the velocity field and the stresses arising in the media. Such fluids exhibit properties of both solids and liquids, and therefore cannot be modeled with methods of elasticity or Newtonian …
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Non-isothermal dynamics of thin-film free-surface and channel flows of non-Newtonian nanofluids
… of the dynamic behaviour of generalized-viscoelastic-fluidbased nanofluids (GVFBNs) and viscoelastic-fluid-based nanofluids (VFBNs) has a number of industrial applications such as in new battery technologies and phasechange heat transfer devices. The computational results have shown that …
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A study of a flapping flag in viscoelastic fluids and its implications for micro-scale swimming in biofluids
… of propulsion when in viscous, viscolelastic fluids rather than Newtonian fluids. By studying the dynamics of a flag under a flow of a viscoelastic fluid, we hope to better understand the swimming dynamics in these biological fluids. A slender polysiloxane rod was placed in a rotating annulus …
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A variational multiscale framework for non-Newtonian fluid models
… for non-Newtonian models for complex fluids. One class of non-Newtonian fluids is shear-rate dependent fluids that include nonlinear viscosity functions of the second invariant of the rate-of-deformation tensor, thereby resulting in shear-thinning or shear-thickening effects. Another …
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Numerical modelling of the Oldroyd-B fluid
… a 3D finite element model of the Oldroyd-B fluid for use in a complex geometry. The model is developed in deal.ii, which is a C++ finite element library. In addition to the standard finite element approach for the momentum equation, the discontinuous Galerkin method is used for the …
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A NUMERICAL STUDY OF NONLINEAR VISCOELASTIC FLOW AND NONISOTHERMAL POWER-LAW FLOW
… difference technique, the steady flow of a viscoelastic fluid through a contraction/expansion and a modified Graetz heat transfer problem for power-law fluids between parallel plates are numerically studied. The constitutive model used for the viscoelastic fluid flow extends the Maxwell …
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Adaptive Finite Element Methods for Rigid Particulate Flow Problems
… rigid particles in an incompressible viscous or viscoelastic fluid. What makes this task especially challenging is the fact that two different physical models are coupled: The fluid motion is described by a system of partial differential equations (Navier-Stokes equations), while the dynamics of …
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Numerical studies of Newtonian and viscoelastic fluids
… to understand the flow behavior of Newtonian and viscoelastic fluids in porous materials, four-to-one contraction and the flow of a Newtonian fluid past an airfoil. In simulations the viscoelastic fluid is modeled by the finitely extensible nonlinear elastic (FENE) dumbbell and Oldroyd-B models. …
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Effects of viscous dissipation on hydrodynamic stability of viscoelastic fluids
Two constitutive equations for viscoelastic fluids are examined in linearized hydrodynamic stability analysis for the effects of viscous dissipation, in plane Couette flow heated from below. All physical properties are assumed constant except the density in the body-force term of the momentum …
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Numerical Simulations of Viscoelastic Flows Using the Discontinuous Galerkin Method
In this work, we develop a method for solving viscoelastic fluid flows using the Navier-Stokes equations coupled with the Oldroyd-B model. We solve the Navier-Stokes equations in skew-symmetric form using the mixed finite element method, and we solve the Oldroyd-B model using the discontinuous …
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Computational studies of viscoelastic multiphase flows
… direct numerical simulations (DNS) of viscoelastic two-phase flow problems. The Oldroyd-B constitutive equation is used to model the viscoelastic liquid. The code is used to study transient and steady state shapes of Newtonian and viscoelastic drops in simple shear and buoyancy driven …
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The Design and Analysis of a Micro Squeeze Flow Rheometer
… research. However, frequently the amount of fluid available is too small, precluding the use of conventional rheometers. Conventional rheometers also tend to have the disadvantage of being too massive, preventing them from operating effectively at high frequencies. The investigation carried …
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