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Showing 1 to 14 of 14 for “"cavity flows"”.
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Cavity Flows Control by High Frequency Forcing
… same time. The physical mechanisms leading to cavity flow control by high frequency forcing is not well understood yet. The author of this thesis intends to offer a contribution toward a physical explanation for them, based on the analysis of data acquired with the Time Resolved PIV technique.
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Separation Bubbles and Vortex Formation in Cavity Flows
… of vortices and separation bubbles in a square cavity as well as in a cylindrical cavity. Whereas there has been previous research work on the problem of a free stream over different types of cavities, like open and closed cavities or lid driven cavities, this research on an inlet induced flow …
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Feedback control of oscillations in combustion and cavity flows
… considered: the compressible flow past a shallow cavity. We start by finding a linear model of the cavity flow's dynamics, or its `transfer function', which we identify from direct numerical simulations. We compare this measured transfer function to that given by a conceptual model which is based …
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Dynamic Estimation of Large-Scale Flow Events in Open Cavity Flows
<p>Flow over an open cavity has a dynamically complex flowfield, generating pressure fluctuations that can amplify shear stress and cause structural damage to the stores within it and the aircraft as a whole. These pressure loads are linked to large-scale resonant shear layer phenomena. …
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Sensitivity analysis and simulations of surface heating for hypersonic cavity flows
… to a change in the wall temperature. The cavity flow results are compared to Nestler et al.’s experimental data and Holifield’s CFD results. The cavities with an L/H greater than 1 presented a good match to the experimental data for both heating and pressure. The flow did not fully develop …
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An Experimental Study of Formation of Circulation Patterns in Laminar Unsteady Driven Cavity Flows Using Particle Image Velocimeter (PIV) Techniques
… the high laminar to transitional range. Driven Cavity Flow is a classic fluid dynamics case often used for benchmarking of computational codes. Previous work has primarily focused on improving computational codes, experimental work is lacking and focused on obtaining steady state readings. The …
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Thermal convection in slender laterally-heated cavities
Two-dimensional convective flows in shallow and tall cavities with adiabatic or conducting horizontal boundaries and driven by differential heating of the two vertical end walls, are studied numerically over a range of Rayleigh numbers and Prandtl numbers. As the Rayleigh number increases, …
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Multi-level Parallelism with MPI and OpenACC for CFD Applications
… study, a CFD code that solves incompressible cavity flows is accelerated using OpenACC. Overlapping communication with computation improves performance for the multi-GPU implementation by up to 21%, achieving up to 400 times faster performance than a single CPU and 99% weak scalability …
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Radial basis function based meshless methods for fluid flow problems
… benchmark problems like the driven cavity flows in square and rectangular domains and backward facing step flow problem are solved to study the performance of the developed schemes. Finally, a higher order radial basis function based scattered node finite difference method is …
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High performance computing for multiphase fluid flows
Multiphase fluid flows are very common in engineering and science applications. Examples include air ow on water surface, metallurgical flow and blood flow in the body. In these flows, fluids are separated by a sharp interface and form different phases. The flow is characterized by the movement of …
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Unsteady aerodynamics using high-order methods
Unsteady flows occur in many applications of engineering interest. One category of unsteady flows occur as self-sustaining oscillatory fluid motion, such as the flow over rectangular cavities. There has been a significant amount of research performed on this topic over the years, both …
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Modified nodal integral method for Navier-Stokes equations incorporated with generic quadrilateral elements, and GPU-based parallel computing
… is applied to simulate the lid-driven cavity flows in a unit cube and a prism with aspect ratio of two, and is validated. A performance analysis indicates that the MNIM on GPU can be an order of magnitude faster than on a CPU.
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An Approximation for the Twenty-One-Moment Maximum-Entropy Model of Rarefied Gas Dynamics
… offers a hyperbolic treatment of viscous flows exhibiting heat transfer. This twenty-one moment model has the ability to provide accurate solutions where the Navier-Stokes equations lose physical validity due to the solution being too far from local equilibrium. Furthermore, its …
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Wind-Induced Pressures in Air Permeable, Double-Layer Roof Systems in Regions of Separated Flow
… Because of the pressure transmission into the cavity between layers, the pressure difference in the double-layer systems differs significantly from that in a single layer. The interior pressures (in the cavity between layers) are highly correlated with external pressures at the openings on the …