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 66 for “"hydrodynamic interactions"”.
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Hydrodynamic interactions in narrow channels
Particle-particle interactions are of paramount importance in every multi-body system as they determine the collective behaviour and coupling strength. Many well-known interactions like electro-static, van der Waals or screened Coulomb, decay exponentially or with negative powers of the particle …
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Active filaments and hydrodynamic interactions in microscale propulsion
… filaments in microscale propulsion and (ii) hydrodynamic interactions between model microswimmers and their environment, namely with external flows and rigid surfaces. Active filaments. Active, slender filaments are ubiquitous in the micro-scale world, both as a part of the propulsive …
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Hydrodynamic interactions of complex fluids and fibrous media
Hydrodynamic interactions of fluids and fibers are encountered in many applications, from filtration processes to the development of novel materials such as nanofluids and nanocomposites, and even in biological systems such as transport of fluids in plants and tissues. It is therefore, valuable …
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Fast algorithms for Brownian dynamics simulation with hydrodynamic interactions
In the Brownian dynamics simulation with hydrodynamic interactions, one needs to generate the total displacement vectors of Brownian particles consisting of two parts: a deterministic part which is proportional to the product of the Rotne-Prager-Yamakawa (RPY) tensor D [1, 2] and the given external …
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Fish swimming optimization and exploiting multi-body hydrodynamic interactions for underwater navigation
… limited, but flow structures resulting from the hydrodynamic interactions between inert and/or living bodies contain rich information, which fish can read through a dedicated sensory system, the lateral line. Fish can even extract energy from these flow features. Immersed Boundary Methods (IBMs) …
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The role of hydrodynamic interactions in the dynamics and viscoelasticity of actin networks
… yet its dynamics remains elusive. We show that hydrodynamic interactions (HIs) significantly alter the time scale of actin deformation by 2-20 fold at different levels of network structure. For a single fiber, HIs between the mesh-sized segments can change the net force by up to 7 fold. …
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Characterizing Hydrodynamic Interactions of Underwater Vehicles in Close Proximity Using an Identical Ellipse Pair
The hydrodynamic interactions between two identical 6:1 ellipses in close proximity were investigated using a 2D immersed interface method simulator in a viscous, rotational flow at Re=1500. Interactions in tandem, side-by-side, and staggered arrangements were characterized based on changes to the …
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Efficient coarse-grained brownian dynamics simulations for dna and lipid bilayer membrane with hydrodynamic interactions
… a wide range of biological problems that involve interactions with surrounding fluid molecules or the so-called hydrodynamic interactions (HIs). From simple biological systems such as a single DNA macromolecule to large and complicated systems, for instances, vesicles and red blood cells (RBCs), …
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Hydrodynamic Interactions of an Unmanned Underwater Vehicle Operating in Close Proximity to a Moving Submarine
… developed a strong arsenal of tools to model the hydrodynamic forces and moments of different vehicles in different conditions, they do not have a model that enables them to understand the forces and moments that an Unmanned Underwater Vehicle (UUV) experiences when operating in close proximity to …
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Improved models of colloidal gels : kinetic arrest relaxation dynamics, structural breakdown and the role of hydrodynamic interactions
… with the systematic study of the influence of hydrodynamic interactions on colloidal gelation to explain the prevailing experimental-theoretical mismatch in the literature. The novel insights drive the development of improved models that can accurately describe the physics of colloidal gels. A …
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Real-time Autonomy and Maneuvering Simulation of an Unmanned Underwater Vehicle Near a Moving Submarine Using Actively Sampled Gaussian Process Surrogate Models
… capable of determining the complex, turbulent, hydrodynamic interactions in real time. Potential flow solvers are typically fast enough, but they neglect viscosity which introduces large inaccuracies that play a critical role in control. On the other hand, Computational Fluid Dynamics (CFD) …
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Fast simulation methods for soft matter hydrodynamics
… to perform large scale dynamic simulations of hydrodynamically interacting colloidal particles undergoing Brownian motion. Approximations to the hydrodynamic interactions between particles are built from the periodic fundamental solution for flow at zero Reynolds number and are methodically …
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Simulating Nanoparticle and Polymer Dynamics in Solution
… for rigorously modelling solvent-mediated hydrodynamic interactions in coarse-grained, mesoscale simulations. We apply MPCD to study transport in nanoparticle-polymer systems and the effects of many-body hydrodynamic interactions on this behaviour. We demonstrate that the translational …
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Physics of Self-assembly in Complex Matter
… the existence of approximately 10,000 long-range interactions in the human genome called loops. My deep learning model detected the most noticeable loops and alluded to the existence of many more loop-like interactions, which are not easily visible to the naked eye. In the fifth and final section …
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Collective hydrodynamics of soft microparticles in quasi-two-dimensional confinement
… which particles can organize themselves through interactions generic to the flow of suspensions through microchannels. In particular, a particle moving through a viscous fluid will create a disturbance flow, affecting the motion of distant particles. These hydrodynamic interactions (HI) are …
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Confinement-mediated accumulation and collective dynamics of microswimmers
… theoretical models and simulations based on hydrodynamic singularities and steric interactions with walls and between swimmers. Our models successfully describe the emergence of regions where swimmers accumulate, and the subsequent flow patterns observed in the experimental data. We first …
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Parallel algorithms for direct blood flow simulations
… new schemes for simulating the three-dimensional hydrodynamic interactions of large number of vesicles with viscosity contrast. The algorithms incorporate a stable time-stepping scheme, high-order spatiotemporal discretizations, spectral preconditioners, and a reparametrization scheme capable of …
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Swimming at low Reynolds number slip boundaries and interacting filaments
… a lot of attention is the role played by hydrodynamic interactions, including those between a cell and its fluid environment (fluid-cell), or between neighbouring cells (cell-cell). These interactions can affect dramatically the dynamics of these swimmers. This dissertation investigates …
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Near-Field Hydrodynamics of Optically Trapped Colloids in Simple and Complex Fluids
… a symmetry-breaking interface due to long-range hydrodynamic interactions. In this thesis, I investigate this phenomenon through both experiments and simulations. Using Optical Tweezers (OTs), I measured the correlated thermal fluctuations between two micron-sized particles held at controlled …
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Large Scale Simulations of Brownian Suspensions
… dynamics formulation by evaluating many-body hydrodynamic interactions using a far-field multipole expansion combined with a near-field lubrication correction. The breakthrough O(N ln N) scaling is obtained by employing a Particle-Mesh-Ewald (PME) approach whereby near-field interactions are …
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