Index Catalog // ScholarsArchive@OSU

Pressure effects on density-difference driven stratified flow : CFD model of DCC event in the HTGR

Creator:: Magnusson, Jill E.
Abstract:: In a Modular High Temperature Gas Reactor (MHTGR), the Depressurized Conduction Cooldown (DCC) event can be separated into three distinct stages: 1) depressurization, 2) air ingress and, 3) natural circulation. During normal operations, the HTGR utilizes forced convection to move the helium coolant through the reactor core. Thus, during normal...
Resource Type:: Masters Thesis

Simulation of drag reduction due to multi-aligned spheres

Creator:: Lindqvist, Varna
Abstract:: A method was sought to predict the flight paths and collisions for closely spaced ink droplets of various sizes as a design aid for ink-jet printing development. Computational fluid dynamics models of two rigid aligned spheres, as a proxy for ink droplets, were initiated in atmospheric pressure air at constant...
Resource Type:: Masters Thesis

RANS and LES predictions of turbulent scalar transport in dead zones of natural streams

Creator:: Drost, Kevin J.
Abstract:: Natural stream systems contain a variety of ﬂow geometries which contain ﬂow separation, turbulent shear layers, and recirculation zones. This work focuses on streams with dead zones. Characterized by slower ﬂow and recirculation, dead zones are naturally occurring cutouts in stream banks. These dead zones play an important role in...
Resource Type:: Masters Thesis

CFD simulation of single-phase and flow boiling in confined jet impingement with in-situ vapor extraction using two kinds of multiphase models

Creator:: He, Xiaoliang
Abstract:: With continued development of the electronic industry, the demand for highly efficient heat removal solutions requires innovative cooling technologies. A computational fluid dynamic (CFD) study, including heat transfer, is performed for an axisymmetric, confined jet impingement experiencing boiling and coupled with vapor extraction. Boiling occurs at the target surface while...
Resource Type:: Masters Thesis

A heterogeneous flow numerical model based on domain decomposition methods

Creator:: Zhang, Yi
Abstract:: In this study, a heterogeneous flow model is proposed based on a non-overlapping domain decomposition method. The model combines potential flow and incompressible viscous flow. Both flow domains contain a free surface boundary. The heterogeneous domain decomposition method is formulated following the Dirichlet-Neumann method. Both an implicit scheme and an...
Resource Type:: Masters Thesis

Analysis of spillway hydrodynamics for total dissolved gas prediction downstream of hydropower projects with free, plunging spillway jets

Creator:: Germann, Nathan A.
Abstract:: During spring and early summer hydropower projects are often forced to spill water through their spillways due to increased river flows of the runoff season. Flows which are directed through spillways--instead of through turbines--contain a substantial amount of energy. Stemming from the high energy content, spillway flows entrain air at...
Resource Type:: Masters Thesis

Numerical design of a high-flux microchannel solar receiver

Creator:: Rymal, Charles
Abstract:: This thesis discusses the design of several microchannel solar receiver devices for use in CSP (concentrated solar power) using CFD (computational fluid dynamics) simulations. The goal is to demonstrate that, by taking advantage of the higher heat transfer coefficienct of microchannels, solar receivers can achieve higher efficiency than current receiver...
Resource Type:: Masters Thesis

A Remotely Controlled Siphon System for Dynamic Water Storage Management

Creator:: Alnahit, Ali
Abstract:: This thesis presents an analytical, experimental and numerical study of the initiation of flows in a siphon for rapid and gradual openings of a downstream valve. Three initial water levels in the upstream tank and four final positions for the downstream valve were investigated. Two opening times of the downstream...
Resource Type:: Masters Thesis

GPU-Based Fluid-Structure Interaction using Immersed Boundary Methods

Creator:: Minar, Christopher
Abstract:: Engineering applications often require fast, accurate solutions of fluid flow around freely moving bodies. The massive parallelism enabled by graphics processing unit (GPU) architecture enables high performance, offering a promising alternative to traditional solver acceleration via multicore central processing units (CPU). However, fully harnessing GPU parallelism requires specialized algorithms and...
Resource Type:: Masters Thesis

Computational Fluid Dynamics Benchmark Analysis of an Historical Sodium Loop Experiment

Creator:: Moore, Thomas M.
Abstract:: Sodium cooled nuclear reactors are being considered for the next generation of nuclear power plants to provide clean electricity to the world. To prove the safety of these reactors, the fuel must be shown to safely handle large neutron fluxes that cause a spike in the thermal output of the...
Resource Type:: Masters Thesis

Swept time-space domain decomposition on GPUs and heterogeneous computing systems

Creator:: Magee, Daniel J.
Abstract:: Modern scientific and engineering problems often require simulations with a level of resolution difficult to achieve in reasonable amounts of time—even in effectively parallelized programs. Therefore, applications that exploit high performance computing (HPC) systems have become invaluable in academia and industry over the past two decades. Addressing the questions that...
Resource Type:: Masters Thesis

Heat Loss Characterization of NIST-1's Containment Vessel

Creator:: Yoshiura, Ramon K.
Abstract:: NuScale Power has designed a small modular reactor using natural circulation cooling dependent systems for both steady-state and transient operations. The NuScale Integral Test System (NIST-1) facility was built to supply test data to NuScale Power to verify and validate computer codes for the NuScale Power Mod- ule (NPM) with...
Resource Type:: Masters Thesis

A Computational Fluid Dynamics Study on the Hydrodynamics for Tandem Plate Configurations under Turbulent Flow

Creator:: Gjemso, Jonathan
Abstract:: The subject of fluid-structure interactions (FSI) are a matter concerning the design of any element immersed in a fluid. One of the most critical phenomena embedded within the scope of FSI is the creation of vortex-induced vibrations (VIV). These type of vibrations originate in a given body as a result...
Resource Type:: Masters Thesis

A New Approach of Computational Fluid Dynamics Studying Power Transient Critical Heat Flux

Creator:: Chen, Tsung-Wen
Abstract:: Power transient boiling has been studied for decades, however, the mechanistic understanding of phenomena which occur during such an event remains incomplete. Due to a dearth of systematic researches, the information of studied phenomenon, detailed physics and applicable hypothesis are very limited. Transient critical heat flux (CHF) is paramount in...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Pressure effects on density-difference driven stratified flow : CFD model of DCC event in the HTGR

Simulation of drag reduction due to multi-aligned spheres

RANS and LES predictions of turbulent scalar transport in dead zones of natural streams

CFD simulation of single-phase and flow boiling in confined jet impingement with in-situ vapor extraction using two kinds of multiphase models

A heterogeneous flow numerical model based on domain decomposition methods

Analysis of spillway hydrodynamics for total dissolved gas prediction downstream of hydropower projects with free, plunging spillway jets

Numerical design of a high-flux microchannel solar receiver

A Remotely Controlled Siphon System for Dynamic Water Storage Management

GPU-Based Fluid-Structure Interaction using Immersed Boundary Methods

Computational Fluid Dynamics Benchmark Analysis of an Historical Sodium Loop Experiment

Swept time-space domain decomposition on GPUs and heterogeneous computing systems

Heat Loss Characterization of NIST-1's Containment Vessel

A Computational Fluid Dynamics Study on the Hydrodynamics for Tandem Plate Configurations under Turbulent Flow

A New Approach of Computational Fluid Dynamics Studying Power Transient Critical Heat Flux

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