NDLI: Computational Analysis on Aerodynamics and Vortex Formation of Sleep Apnea

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Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fluid Dynamics of Wind Energy; Bubble, Droplet, and Aerosol Dynamics

Detailed Pressure Measurements During the Transition to Rotating Stall in an Axial Compressor: Influence of the Throttling Process

Numerical Comparison Between Steady and Sweeping Jets for Active Flow Control Applications

Modeling of Decelerated Descent of an Elongated Body With Vectored Thrust

Synthetic Jet Flow Control Optimization on SD7003 Airfoil at Low Reynolds Number

Route to Chaos in the Fluidic Pinball

Comparison of Two Active Flow Control Mechanisms of Pure Blowing and Pure Suction on a Pitching NACA0012 Airfoil at Reynolds Number of 1 × 106

The Effects of Wakes on Aerodynamic Characteristics of Flapping Wings in Clap-and-Fling Motion at Re of ~104

Hemodynamics Characteristics of a Four-Way Right-Atrium Bypass Connector With an Optimized Central Diverter

Computational Analysis on Aerodynamics and Vortex Formation of Sleep Apnea

Kinematics and Hydrodynamics of Invertebrate Undulatory Swimming

Numerical Simulation of Airflow and Ellipsoidal Particle Deposition in Human Upper Respiratory Tract

Effect of Non-Newtonian Blood Flow on Coronary Artery Hemodynamics in a Cohort of Patients With Stenosed Artery

Experimental Study on Modeled Caudal Fins Propelling by Elastic Deformation

Investigation on Loading-Induced Fluid Flow in Osteogenesis Imperfecta Bone

Experimental Study of Large-Scale Flow Structures in an Aneurysm

The Mechanism of Three-Dimension Steady Shock Wave Interaction

Mass Flow Performance for Large Aspect Ratio Supersonic Boundary Layer Bleed Holes

Optimization of Piece-Wise Conical Nozzles: Theory and Application

Experimental Study of Flow Around a Rotating Sphere at a Moderate Reynolds Number

Wind Flow Characteristics of a Model Downburst

Multi-Plane Characterization of the Turbulent Boundary Layer

The Influence of Wrap Angle of Blade on the Internal Flow Field and Hydraulic Performance of Double Suction Pump

Assessing the Value and Balance of In-Class Demos and Videos in Fluid Mechanics Lecture

An Integrated Approach for the Teaching of Pipe Network Analysis Using Project Based Learning

CFD and Experiment Investigation of the Mixing Characteristics of Non-Newtonian Fluids in a Stirred Vessel

Internal Groove Influenced Thermohydraulic Performance on an Air-Channel

Refractive Index Matching for Optical Flow Investigation With High Density Stratification

Lattice Boltzmann Model for Incompressible Axisymmetric Thermal Flows With Swirl

Perforated-Plate Turbulence: Orifice Versus Converging Nozzle

Vortex Identification Study of a Turbulent Cavity Flow

Multi-Objective Optimization on Inlet Pipe of a Vertical Inline Pump Based on Genetic Algorithm and Artificial Neural Network

Governing Parameters of Adverse Pressure Gradient Turbulent Boundary Layers

Fluid Flow and Heat Transfer Behavior for Turbulent Flows in a Tube With Vortex Generator Pairs for an Efficient Heat Exchanger

Heat Transfer Enhancement With Delta Winglets Vortex Generator for Different Arrangement in a Circular Tube

Effects of Offset Height on the Turbulent Characteristics of Rectangular Twin Jets

Nozzle Orientation Effects on the Turbulent Structure of Submerged Twin Jets

Coherent Structures and Correlation Fields in the Mixing Transition of a Turbulent Round Free Jet

Effect of Fluid Properties on Slug Dissipation in Enlarged Impacting Tee

Simulation of Coalescence and Breakup of Dispersed Water Droplets in Continuous Oil Phase

Foam Breakup in CFC/GLCC© System

Utilization of Churn Flow Coalescer for Improving Foam Breakup in Gas-Liquid Cylinderical Cyclone

Evaluation of Models for Droplet Shear Effect of Centrifugal Pump

Experimental Investigation of a Flapping Motion Downstream of a Backward Facing Step

Wake Flow Patterns Behind Rotating Smooth Spheres and Baseballs

Mechanistic Modeling of Liquid Carry-Over for 3-Phase Flow in GLCC© Compact Separators

Comparative Evaluation of Single/Twin Round and Elliptic Jets Using Particle Image Velocimetry

An Experimental Study of Surface-Mounted Bluff Bodies Immersed in Deep Turbulent Boundary Layers

Characteristics of Large Vortical Structures in the Shallow Wake Flow With a Gap Near the Bed

Turbulent Flow Characteristics Over Offset Wall Confined Columns in a Channel at Low Reynolds Numbers

Flow Structure Formed by a Sweeping Jet Ejected Into a Main Flow

Force Production Mechanisms of a Heaving and Pitching Foil Operating in the Energy Harvesting Regime

Flow Structures and Vortex Dynamics in the Wake of Three Tandem Prisms

Coherent Structures of Tornado-Like Vortices

Effect of Liquid Level on Gas Carry-Under in GLCC Compact Separators

Effects of the Forcing Frequency on Pulsating Impinging Jet Behavior and the Boundary Layer on the Target Curved Wall

Effect of Corner-Arc on the Flow Structures Around a Square Cylinder

Wing Tip Vortex Development Under a Grid Generated Turbulent Flow

Simulations of Hairpin Vortices in the Presence of a Passive Scalar

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Effects of an Underbody Device on the Characteristics of a Trailer Truck Wake Region

Influence of Numerical Dissipation on Draft Tube Flows

Assessment of RANS, LES, and Hybrid RANS/LES Models for the Prediction of Low-Pr Turbulent Flows

Implementation of the Ffowcs Williams-Hawkings Equation: Predicting the Far Field Noise From Airfoils While Using Boundary Layer Tripping Mechanisms

Flow Separation Control and Drag Reduction for a Two-Dimensional Boat-Tailed Bluff Body Through Transverse Grooves

Analysis of Pressure Field on Wire-Wrapped Pin Bundle Surface for Concerns of FSI

An New Immersed Boundary Method With Level Set Based Geometry Representation and Volume Fraction Based Body Force Calculation

A Method for Tracking a Solid Body in a Fluid Field in Immersed Boundary Methods

Analysis of Transient Two-Phase Flow in Pressure Safety Valve Outlet Headers

Fluid-Structure Interaction Simulations of Flexible Cylinders in Confined Axial Flow

A Comparison of Strong and Weak Coupling Schemes for Computational Aeroelasticity in OpenFOAM

Stall Flutter Measurements on a Rectangular Wing

Development of an Advanced Wind Turbine Actuator Line Model

Lift and Drag Forces With Respect to Azimuth Position of a Darrieus Wind Turbine

Oxidation-Assisted Pulsatile Three-Stream Non-Newtonian Slurry Atomization

Three-Dimensional Volume of Fluid Simulations of Air Bubble Dynamics in a Converging Nozzle

Experimental Observation of Bubbles Released in Horizontal Water Flow

Bubble Formation From Porous Plates in Liquid Cross-Flow

Numerical Analysis of Droplet Impact on a Smooth Slippery Surface

Effects of Ambient Air Relative Humidity and Surface Temperature on Water Droplet Spreading Dynamics

Nucleate Boiling Heat Transfer and Bubble Dynamics of Water-in-Polyalphaolefin Nanoemulsion

Quantifying the Spatial-Temporal Evolution of Rim/Ligament in Drop Breakup via Digital In-Line Holography

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Computational Analysis on Aerodynamics and Vortex Formation of Sleep Apnea

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Wang, Junshi Han, Pan Sanchez, Yaselly Xi, Jinxiang Dong, Haibo
Copyright Year	2018
Abstract	The fluid dynamics of air flow in the pharynx is critical to the vibration of the uvula and to the generation of the snoring sound. In this work, a combined experimental and computational approach was conducted to study the aerodynamics of the flow field in the human airway. An anatomically accurate pharynx model associated with different uvula kinematics was reconstructed from human magnetic resonance images (MRI) and high-speed photography. An immersed-boundary-method (IBM)-based direct numerical simulation (DNS) flow solver was used to simulate the corresponding unsteady flows in all their complexity. Analysis has been performed on vortex dynamics and pressure oscillation at various points of interest. Computations with varying airway obstructions, uvula kinematics, and vibrating frequencies were conducted to study the effect of the three factors on the vortex formation and pressure oscillation, respectively. It is found that the vortex formation is significantly affected by the airway width. The fast Fourier transformation (FFT) analysis of the pressure time history revealed the existence of higher order harmonics of the base frequency at significant amplitudes. It was also found that the pressure tended to oscillate more violently at higher uvula vibrating frequencies. Results from this work are expected to bring novel understanding on the sound producing in patients with sleep apnea and provide guidance for surgical interventions.
Sponsorship	Fluids Engineering Division
File Format	PDF
ISBN	9780791851555
DOI	10.1115/FEDSM2018-83257
Volume Number	Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fluid Dynamics of Wind Energy; Bubble, Droplet, and Aerosol Dynamics
Conference Proceedings	ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting
Language	English
Publisher Date	2018-07-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Fourier transforms Vibration Computer simulation Fluid dynamics Magnetic resonance Oscillations Aerodynamics Unsteady flow Pressure Flow (dynamics) Photography Air flow Sleep Magnetic resonance imaging Computation Dynamics (mechanics) Vortices Surgery Kinematics
Content Type	Text
Resource Type	Article

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