Browsing by Subject "turbulence"
Now showing items 1-20 of 23
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Advanced Laser Diagnostics Development for Stereoscopic Imaging of Gaseous High Speed Flows
(2016-05-06)The coupled interactions between turbulent flow and thermal non-equilibrium (TNE) are physical and chemical processes with significant implications in turbulent heat transfer, fluid mixing, and fluid transport associated ... -
An Analysis of Bubble Plumes in Unstratified Stagnant Water
(2015-12-14)Multiphase flows are ubiquitous in nature and engineering scenarios; examples include volcanic eruption, cloud formation, land reclamation and subsea oil well blowout. In these flows, one or more heterogeneous materials ... -
An Analysis of Self-similarity, Momentum Conservation and Energy Transport for an Axisymmetric Turbulent Jet through a Staggered Array of Rigid Emergent Vegetation
(2013-05-29)Marsh vegetation is widely considered to offer protection against coastal storm damage, and vegetated flow has thus become a key area of hydrodynamic research. This study investigates the utility of simulated Spartina ... -
Analysis of periodically-forced turbulence in the rapid distortion limit
(Texas A&M University, 2006-04-12)Rapid Distortion Theory is used to perform calculations of unsteadily-forced initially isotropic turbulence so that the physics of such flows can be better understood. The results of these calculations show that there are ... -
Behavior of Turbulent Structures within a Mach 5 Mechanically Distorted Boundary Layer
(2013-08-05)High-resolution particle image velocimetry (PIV) is employed to resolve the velocity fields within a Mach 4.9 mechanically distorted turbulent boundary layer (Reθ ≈ 40,000). The goal of this study is to directly observe ... -
CFD Simulations of Erosion of a Stratified Layer by a Buoyant Jet in a Large Vessel
(2015-04-29)One of the most important parameters in the analysis of containment safety of the light water reactors during a loss of coolant accident (LOCA) is the prediction of the hydrogen concentration. To ensure proper design of ... -
Charecterization of inertial and pressure effects in homogeneous turbulence
(Texas A&M University, 2005-11-01)The objective of the thesis is to characterize the linear and nonlinear aspects of inertial and pressure effects in turbulent flows. In the first part of the study, computations of Navier-Stokes and 3D Burgers equations ... -
Coastal Microstructure: From Active Overturn to Fossil Turbulence
(2012-02-14)The Remote Anthropogenic Sensing Program was a five year effort (2001- 2005) to examine subsurface phenomena related to a sewage outfall off the coast of Oahu, Hawaii. This research has implications for basic ocean ... -
Direct Numerical Simulation of the Flow in a Pebble Bed
(2014-06-24)The flow in a tightly packed array of spheres is important to various engineering fields. In nuclear engineering applications, for instance, researchers have proposed core geometries of the pebble bed reactor (PBR) type ... -
Effects of Single Mode Initial Conditions in Rayleigh-Taylor Turbulent Mixing
(2011-02-22)The effect of single mode initial conditions at the interface of Rayleigh-Taylor(RT) mixing are experimentally examined utilizing the low Atwood number water channel facility at Texas A&M. The water channel convects two ... -
An investigation of the influence of initial conditions on Rayleigh-Taylor mixing
(Texas A&M University, 2006-04-12)Experiments and direct numerical simulations (DNS) have been performed to examine the e¤ects of initial conditions on the dynamics of a Rayleigh-Taylor unsta- ble mixing layer. Experiments were performed on a water channel ... -
Model Aided Observational Study of Physical Processes in Fresh Water Reservoirs
(2012-10-19)The aim of this study is to compare observational data to data simulated by a one dimensional model. Observational data collected from January to July 2006 at Lake Whitney, Texas, included water current velocities from an ... -
Numerical modeling of species transport in turbulent flow and experimental study on aerosol sampling
(Texas A&M University, 2007-04-25)Numerical simulations were performed to study the turbulent mixing of a scalar species in straight tube, single and double elbow flow configurations. Different Reynolds Averaged Navier Stokes (RANS) and Large Eddy Simulation ... -
Observational and Numerical Modeling Studies of Turbulence on the Texas-Louisiana Continental Shelf
(2013-05-24)Turbulent dynamics at two sites (C and D) in a hypoxic zone on the Texas- Louisiana continental shelf were studied by investigating turbulence quantities i.e. turbulence kinetic energy (TKE), dissipation rate of TKE ... -
Performance and application of the Modular Acoustic Velocity Sensor (M.A.V.S.) current meter for laboratory measurements
(Texas A&M University, 2005-02-17)Every type of current meter is different and has its proper characteristics. Knowing the performance of a current meter is essential in order to use it properly either for field or laboratory measurements (such as in the ... -
Rotational and Vibrational Raman Spectroscopy for Thermochemistry Measurements in Supersonic Flames
(2013-05-31)High speed chemically reacting flows are important in a variety of aerospace applications, namely ramjets, scramjets, afterburners, and rocket exhausts. To study flame extinction under similar high Mach number conditions, ... -
Selected problems in turbulence theory and modeling
(Texas A&M University, 2004-09-30)Three different topics of turbulence research that cover modeling, theory and model computation categories are selected and studied in depth. In the first topic, "velocity gradient dynamics in turbulence" (modeling), the ... -
Shock-Turbulence Interactions at High Turbulence Intensities: Theory and Direct Numerical Simulations
(2018-10-25)The interaction of turbulence with shock waves, while very common in nature and engineered systems, is a very difficult problem from a theoretical, numerical and experimental perspective. A main challenge comes from the ... -
Study of Nonlinear Analysis and Chaos in Vibrations and Fluids
(2016-05-18)Chaos and turbulence are two important topics in nonlinear dynamics. In this study, two problems related to chaos and turbulence modelling are presented. They are the chaotic vibration phenomenon in high-dimensional partial ... -
Turbulence Generation Using Localized Sources of Energy: Direct Numerical Simulations and the Effects of Thermal Non-Equilibrium
(2016-04-13)Turbulence in high-speed flows is an important problem in aerospace applications, yet extremely difficult from a theoretical, computational and experimental perspective. A main reason for the lack of complete understanding ...