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Showing 1 to 20 of 25 for “"laminar flows"”.
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Dynamics and statistics of hydrodynamically interacting particles in laminar flows
… interacting particles in low Reynolds number flows, which is discussed in three interrelated themes. The first theme focuses on polymer fractionation. With our basic model we explore the possibility to sort dumbbells with respect to their size using a two dimensional periodic potential. It …
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Microfluidic synthesis of colloidal nanomaterials
… tunable sizes. Microscale segmented gas-liquid flows overcome the large axial dispersion effects associated with single-phase laminar flows. Microchannel devices that yielded uniform, stable gas-liquid segmented flows over three orders of magnitude in flow velocity were first developed.
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Grid adaptation for functional outputs of compressible flow simulations
… applied to two-dimensional inviscid and viscous (laminar) flows using standard finite volume discretizations, and to scalar convection-diffusion using a Galerkin finite element discretization. Isotropic h-refinement is used to iteratively improve the grids in a series of subsonic, transonic, and …
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Laminar-flow Liquid-to-air Heat Exchangers - Energy-efficient Display Cabinet Applications
… tem¬peratures, and so the flow regime is often laminar, which may lead to poor heat transfer. However, it is possible to achieve high heat transfer coefficients even for laminar flows if an ap¬propriate design of the heat exchanger is applied. Flat-tube heat exchangers have been used for a long …
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Numerical Analysis of the Viscous Flow in a Supersonic Diffuser
… design is based on the combination of elementary flows. Two simple wave regions connected by a sink flow are used to take a uniform supersonic flow at one Mach number to a uniform supersonic flow at a lower Mach number. The theory gives an exact solution for two-dimensional flow. The shape of the …
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Development of a flow-condition-based interpolation 9-node element for incompressible flows
… widely used for the analysis of incompressible laminar flows. If the Reynolds number is increased to certain values, oscillations appear in the finite element solution of the Navier-Stokes equations. In order to solve for high Reynolds number flows and avoid the oscillations, one technique is to …
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Numerical Navier-Stokes solutions of supersonic slot injection problems
… modeling, two sample cases were chosen with laminar flows. The sample problems were the compressible laminar boundary layer flow over a flat plate and the laminar boundary layer - shock interaction problem. For these problems, both the results from Roe’s FDS and van Leer’s flux vector …
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On acoustic particle and cell manipulation in microfluidic systems
The combination of laminar flows in microfabricated channels and acoustic forces induced in ultrasonic standing wave fields offers new possibilities for advanced particle and cell manipulation in lab-on-a-chip applications as well as in relatively high throughput applications. Acoustic particle …
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Predicting Motion of Engine-Ingested Particles Using Deep Neural Networks
… of aviation gas turbine engines. Complex flows, such as flow through a particle separator, naturally have rotation and strain present throughout the flow field. This study attempts to understand if the motion of particles within rotational and strained canonical flows can be accurately …
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Velocity and temperature fields in oscillating boundary layers
… velocity and temperature fields are studied for laminar flows. In general the steady-streaming contributions are small, but it appears from the present results that for large Eckert numbers the wall heat transfer may be altered up to 40% by the streaming phenomena. Unfortunately there is no …
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A Higher Order Accurate Finite Element Method for Viscous Compressible Flows
… of each discretization. Examples of inviscid flows including subsonic flow past a parabolic bump on a wall and subsonic and transonic flows past a NACA 0012 airfoil and laminar flows including flow past a a flat plate and flow past a NACA 0012 airfoil are included to qualitatively evaluate the …
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A computational and experimental investigation into the aeroacoustics of low speed flows
The noise produced by low Mach number (M ? 0.4) laminar and turbulent flows is studied using computational and experimental techniques. The emphasis is on the development and application of numerical methods to further the understanding of noise generation and far field radiation. Numerical …
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A robust simplex cut-cell method for adaptive high-order discretizations of aerodynamics and multi-physics problems
… of aerodynamics problems, including inviscid and laminar flows. We develop a high-order DG method with a dual-consistent output evaluation for elliptic interface problems, and extend the simplex cut-cell technique for these problems, together with a metric-optimization adaptation algorithm to …
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Large Eddy Simulation of Boundary Layer Combustion
… have been developed using several benchmark laminar flow problems for the following canonical configurations: a binary diffusion controlled mixing problem, Poiseuille flow with heat transfer, and classical Blasius boundary layer flow. The turbulence LES modeling capability is validated by …
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On the Dynamics of Noncircular Accretion Discs
… describing simple horizontally invariant ``laminar flows'' in a local model of an eccentric disc, which can be used to study the disc's dynamical vertical structure. I also move beyond the purely hydrodynamic models of the preceding chapters and consider the action of magnetic fields in a …
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Magnetohydrodynamics in the Inner Regions of Protoplanetary Discs
… variability, interactions between turbulent and laminar flows, and the formation of pressure maxima and vortices – yet remain poorly understood. This thesis develops a more complete understanding of how magnetically-mediated processes around the dead–active zone interface shape the structure and …
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Numerical study of nanofluid-based direct absorber solar collector systems with metallic/carbon nanoparticles, multiple geometries and multi-mode heat transfer
… diamond, graphite etc). Viscous incompressible laminar flows using Newtonian fluid models (Navier-Stokes equations) with thermal convection and radiative heat transfer are considered both with and without thermal buoyancy. Several thermal radiative flux models are deployed to mimic solar …
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On the false-diffusion problem in the numerical modelling of convection-diffusion processes
… differential equations for recirculating flows with and without sources. In an effort to evaluate the performance of the various numerical schemes available, some standard test cases were used. The relative merits of the schemes were assessed by means of one-dimensional laminar flows and …
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Air Ingress and Heat-Driven Flow Relaminarization in a Very High Temperature Reactor (VHTR)
… studied is the issue of heat-driven flow relaminarization (forced convection), in which a strongly heated turbulent gas flow, exhibits heat transfer characteristics of laminar flows in the downstream part. As the gas is heated, a reduction in the gas density causes the bulk flow to …
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Large eddy simulations of turbulent flows on graphics processing units: application to film-cooling flows
… Direct Numerical Simulations (DNS) of turbulent flows. In LES the large, energy containing eddies are resolved by the computational mesh, but the smaller (sub-grid) scales are modeled. In DNS, all scales of turbulence are resolved, including the smallest dissipative (Kolmogorov) scales. Clusters …
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