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.
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Showing 1 to 20 of 28 for “"slip boundary condition"”.
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Hydrodynamics with a wall-slip boundary condition for a particle moving near a plane wall bounding a semi-infinite viscous fluid
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1992.
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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. …
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Engineering physico-chemical interactions across drug delivery, agriculture and carbon capture
… to inject through medical needles as the no-slip boundary condition between the needle and the viscous drug product greatly resists fluid flow. In agriculture, the inherent water repellency of plant surfaces causes pesticide sprays to bounce off, resulting in enormous waste and environmental …
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Prediction of velocity distribution from the statistics of pore structure in 3D porous media via high-fidelity pore-scale simulation
… with the finite volume method and imposing a no-slip boundary condition at the boundary of each sphere. High fidelity numerical simulations of Stokes flow are facilitated with the assist of open source Computational Fluid Dynamics (CFD) tools such as OpenFOAM. We show that the distribution of low …
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Simulating the Motion of Droplets on High-Slip Patterned Surfaces
… flowing over such surfaces have been found to slip in apparent violations of the classical no-slip boundary condition. For liquid-infused patterned surfaces, and for surfaces with large slip-lengths and anisotropic patterning, the leading theoretical model describing spherical droplet motion on …
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On the rolling motion of viscous fluid on a rigid surface
… to be an incompressible Newtonian fluid and a no-slip boundary condition is enforced at the solid boundary, the non-integrable stress singularity arises at the contact line, which is physically unrealistic. The contact angle of 180 is considered as a special case in which the singularity is …
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The influence of superhydrophobic surfaces on near-wall turbulence
… due to the overlying flow being able to locally slip over the gas pockets, resulting in a mean slip at the surface. This thesis investigates the different effects that slip and the texturing of the surface have on turbulence over superhydrophobic surfaces. It is shown that, after filtering out …
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Field-driven dynamics of dilute gases, viscous liquids and polymer chains
… The problems considered herein pertain to the slip-induced motion of a rigid, spherical or nonspherical particle in a fluid in the presence of an inhomogeneous temperature or concentration field or an electric field, and the dynamics of charged polymers animated by the application of an …
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A Class of Stable, Efficient Navier-Stokes Solvers
… fluids in a bounded domain with given boundary value of velocity. The incompressibility constraint and non-slip boundary condition have made this problem very challenging. Their treatment by finite element method leads to the well-known inf-sup compatibility condition. Their treatment …
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A high-order hybrid flow solver for the simulation of nonlinear internal waves in long complex domains
… solved using a deflated block-Jacobi preconditioned conjugate gradient solver which ensures a fast convergence rate independent of the domain's aspect-ratio, the number of elements in the along-wave propagating direction and the polynomial order per spectral element. Other implementation …
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Passive and active approaches to sustained turbulent hydrodynamic drag reduction using superhydrophobic surfaces
… rough texture when submerged in water. A partial slip condition is created at the interface between the water and the submerged body, allowing for a reduction in skin friction drag. I begin by identifying and fabricating several superhydrophobic surfaces, and testing their ability to reduce skin …
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Enhanced Laminar Convective Heat Transfer using Microstructured Superhydrophobic Surfaces
… to the surface. For many cases, the classical no slip boundary condition holds true. However, there are a subset of situations where this assumption is not valid, and slip between the surface and fluid must be considered. One such example is a micropatterned, superhydrophobic surface, which has …
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Modelling of Friction Stir Welding
… chapter 2. The trials examined how the welding conditions and tool type affected the weld temperature and heat input. From this data a thermal model of the welds was developed that included the convective heat flow due to material mixing. Chapters 3 to 6 describe the model development, from a …
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Molecular dynamics-based approaches for mesoscale lubrication
… stress-strain rate relationship and b) the no-slip boundary condition. In this thesis, we present a methodology for deriving a modified Reynolds equation (referred to as the Molecular Dynamics-based Equation for Lubrication, or the MODEL) which overcomes these limitations by introducing a …
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A Computational Framework for Fracture Modeling in Coupled Field Problems
… movement on the flow is characterized by a non-slip boundary condition. A boundary split scheme is proposed to ensure the coercivity of the method. The fluid-driven force on particles is represented by a boundary integral of the viscous drag force around the particles. The corresponding …
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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]. …
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Supersonic Constricted Plasma Flows
… fluid dynamics and plasma simulations. Boundary layer effects are significant in the rarefied flow within the constricted discharge chamber. A slip boundary condition with the appropriate tangential momentum and thermal accommodation coefficients must be used to produce results that …
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Supersonic Constricted Plasma Flows
… fluid dynamics and plasma simulations. Boundary layer effects are significant in the rarefied flow within the constricted discharge chamber. A slip boundary condition with the appropriate tangential momentum and thermal accommodation coefficients must be used to produce results that …
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Generation and maintenance of recirculations by Gulf Stream instabilities
… through the open boundaries. Only the western boundary of the domain is closed, and a free slip boundary condition is used there. The results of the numerical experiments show that when only the mechanism of barotropic instability is present, the model has two energy states for a wide range of …
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