Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"slip boundary conditions"”.
-
Finite element approximations for fluid flows governed by nonlinear slip boundary conditions of friction type: from theory to computations
… flows with special nonlinearities coming from boundary con- ditions. In Chapter 1, we consider the finite element approximations of steady Navier-Stokes and Stokes equations driven by threshold slip boundary conditions. After re-writing the problems in the form of variational inequalities, a …
-
Role of surface chemistry in sub-Einstein rheology of nano-composites
… 2.5 (as predicted by Einstein for no slip boundary conditions) to negative values. We discuss these results in light of previous studies of the intrinsic viscosity of nanoparticles in polymer melts with special attention to particle-polymer segment surface interactions that result in …
-
Analysis of the wake behind a propeller using the finite element method with a two-equation turbulence model
… solution and provides an easier imposition of boundary conditions by solving up to wall with no slip boundary conditions. The two-equation turbulence model with the wall modification was first successfully tested by solving the turbulent flow through a sudden pipe expansion. The numerical …
-
Dynamics and assembly of colloidal particles
… the dynamics of a Janus particle having stick–slip boundary conditions, and examine how this might influence the conformations of clusters, presenting a way to utilize hydrodynamic flows in order to control particle orientations in suspension processing and the manufacture of composite …
-
Eddies and friction : removal of vorticity from the wind-driven gyre
… if it is active only in a narrow region near the boundary. Vorticity removal is modeled here as a viscosity enhanced very near the solid boundaries to roughly parameterize missing boundary physics like topographic interaction and three dimensional turbulence over the shelf. This boundary-enhanced …
-
Structure-preserving finite element and finite volume methods for nonlinear and time-dependent PDEs
… formulation of the Stokes problem with Navier’s slip boundary conditions, followed by the development of an asymptotic-preserving and mass-conservative method for weakly compressible flows. As the Mach number approaches zero, this method converges to an exactly divergence-free scheme for the …
-
Three-dimensional nonequilibrium viscous shock-layer flows over complex reentry vehicles
… results. This code is capable of analyzing shock-slip or no-shock-slip boundary conditions and equilibrium or non-catalytic wall boundary conditions. In this study the diffusion model is limited to binary diffusion. A sphere-cone-cylinder-flare with moderate flare angle, a straight biconic, and a …
-
Swimming at low Reynolds number slip boundaries and interacting filaments
… hydrodynamically with a fluid through slip boundary conditions or with other filaments and is composed of two separate parts. The first part of the thesis focuses on a single filament characterised by a slip boundary condition, which is a property displayed by many non-Newtonian fluids. …
-
Radial basis function based meshless methods for fluid flow problems
… strategy is proposed for incor-porating the no-slip boundary conditions. Optimisation strategies based on residual error objective and leave-one-out statistical criterion are proposed to evaluate the optimal shape parameter value in case of the multiquadric RBF for collocation and scattered …
-
Dynamics of nonlinear cross-equatorial flow in the deep ocean
… within and stability of nonlinear deep western boundary currents in an idealized tropical ocean are studied using a shallowwater model. Observational evidence indicates that the potential vorticity of fluid parcels in deep western boundary currents must change sign as they cross the equator, but …
-
Molecular Dynamics Simulations of A Suspended Particle In A Fluid Near A Wall
… problems are still unclear. For example, the boundary conditions of the interaction surfaces. For hundreds of years it has relied on the no-slip boundary condition at the solid-liquid interface in the continuum theory, and it was also applied to model many macroscopic experiments[Batchelor00]. …
-
The sensitivity and predictability of mesoscale eddies in an idealized model ocean
… its advantages a heightened resolution in the boundary layer regions. The pseudospectral method, employing an orthogonal expansion in Fourier and Chebyshev functions, relies upon a discrete Green's function technique capable of satisfying to spectral accuracy rather arbitrary boundary …
-
Analytical and Experimental Investigation of Insect Respiratory System Inspired Microfluidics
Microfluidics has been the focal point of research in various disciplines due to its advantages of portability and cost effectiveness, and the ability to perform complex tasks with precision. In the past two decades microfluidic technology has been used to cool integrated circuits, for exoplanetary …
-
Understanding self-assembly and flow heterogeneities in poloxamer wormlike micelles
… accompanied by elastic instabilities and wall slip. The mechanism of shear-band formation was unlike any WLMs studied previously and more closely resembled the mechanism in yield stress fluids. Exploring the evolution of shear bands in this WLM gel with rheology similar to both canonical …