A5012657014- Fluid Dynamics and Turbulent Flows
- Computational Fluid Dynamics and Aerodynamics
- Turbomachinery Performance and Optimization
- Combustion and flame dynamics
- Plasma and Flow Control in Aerodynamics
- Aerodynamics and Fluid Dynamics Research
- Gas Dynamics and Kinetic Theory
- Aeroelasticity and Vibration Control
- Wind and Air Flow Studies
- Biomimetic flight and propulsion mechanisms
- Aortic aneurysm repair treatments
- Aerodynamics and Acoustics in Jet Flows
- Plasma Diagnostics and Applications
- Cardiac Valve Diseases and Treatments
- Fluid Dynamics and Vibration Analysis
- Heat Transfer Mechanisms
- Aortic Disease and Treatment Approaches
- Intracranial Aneurysms: Treatment and Complications
- Neurosurgical Procedures and Complications
- Particle Dynamics in Fluid Flows
- Traumatic Brain Injury and Neurovascular Disturbances
- Cardiovascular Health and Disease Prevention
- Particle physics theoretical and experimental studies
- Cardiovascular Function and Risk Factors
- Engineering Applied Research
North Dakota State University
2008-2025
Dakota State University
2006-2024
University of Kentucky
2000-2005
Wichita State University
1993-1999
A new correlation-based transition model has been developed, which is based strictly on local variables. As a result, the compatible with modern computational fluid dynamics (CFD) approaches, such as unstructured grids and massive parallel execution. The two transport equations, one for intermittency onset criteria in terms of momentum thickness Reynolds number. proposed equations do not attempt to physics process (unlike, e.g., turbulence models) but form framework implementation models...
A new correlation-based transition model has been developed, which is built strictly on local variables. As a result, the compatible with modern computational fluid dynamics (CFD) methods using unstructured grids and massive parallel execution. The based two transport equations, one for intermittency onset criteria in terms of momentum thickness Reynolds number. proposed equations do not attempt to physics process (unlike, e.g., turbulence models), but form framework implementation models...
A mathematical model was developed to simulate flow control applications using plasma actuators. The effects of the actuators on external are incorporated into Navier Stokes computations as a body force vector. In order compute this vector, solves two additional equations: one for electric field due applied AC voltage at electrodes and other charge density representing ionized air. is calibrated against an experiment having plasma-driven in quiescent environment then low pressure turbine...
A new correlation-based transition model has been developed, which is based strictly on local variables. As a result, the compatible with modern CFD approaches such as unstructured grids and massive parallel execution. The two transport equations, one for intermittency onset criteria in terms of momentum thickness Reynolds number. proposed equations do not attempt to physics process (unlike e.g. turbulence models), but form framework implementation models into general-purpose methods. Part I...
A new transport equation for intermittency factor is proposed to model transitional flows. The intermittent behavior of the flows incorporated into computations by modifying eddy viscosity, μt, obtainable from a turbulence model, with factor, γ:μt*=γμt. In this paper, Menter’s SST employed compute μt and other turbulent quantities. can be considered as blending two models—Steelant Dick Cho Chung. former was near-wall designed reproduce streamwise variation in transition zone following Dhawan...
With the increased availability of computational resources, past decade has seen a rise in use fluid dynamics (CFD) for medical applications. There been an increase application CFD to attempt predict rupture intracranial aneurysms, however, while many hemodynamic parameters can be obtained from these computations, date, no consistent methodology prediction identified. One particular challenge is that factors contribute its accuracy; mesh resolution and spatial/temporal discretization alone...
A new transport equation for the intermittency factor was proposed to predict separated and transitional boundary layers under low-pressure turbine airfoil conditions. The intermittent behavior of flows is taken into account incorporated computations by modifying eddy viscosity, μt, with factor, γ. Turbulent quantities are predicted using Menter’s two-equation turbulence model (SST). obtained from a model, which not only can reproduce experimentally observed streamwise variation in...
A recently introduced phenomenological model to simulate flow control applications using plasma actuators has been further developed and improved in order expand its use complicated actuator geometries. The new modeling approach eliminates the requirement of an empirical charge density distribution shape by embedded electrode as a source for density. resulting is validated against flat plate experiment with quiescent environment. incorporates effect on external into Navier Stokes...
A new correlation-based transition model has been developed, which is built strictly on local variables. As a result, the compatible with modern CFD methods using unstructured grids and massive parallel execution. The based two transport equations, one for intermittency onset criteria in terms of momentum thickness Reynolds number. proposed equations do not attempt to physics process (unlike e.g. turbulence models), but form framework implementation models into general-purpose methods. Part...
A transport equation for the intermittency factor is employed to predict transitional e ows in low-pressure turbine applications. The intermittent behavior of taken into account and incorporated computations by modifying eddy viscosity πt with °. Turbulence quantities are predicted using Menter’ s shear stress two-equation turbulence model, obtained from solution a recently developed model. model not only can reproduce experimentally observed streamwise variation transition zone, but it also...
Camber deflection concepts for a VR-12 rotorcraft airfoil were studied the optimization of unsteady aerodynamics, including dynamic stall conditions and wing–wing interactions during pitching. The designs are based on deflections leading edge trailing sections airfoil. parameters initially established using Computational Fluid Dynamics (CFD). Results from CFD Particle Image Velocimetry (PIV) generated various combinations comparison their performances. this study Reynolds number 250,000...
This paper investigates the use of dielectric barrier discharge plasma actuators in low Re flow control applications. Three different actuator geometries have been tested: a conventional design using two rectangular strip electrodes (the linear actuator) that produces nearly two-dimensional horizontal wall jet upon actuation, and new designs render induced form vertical can be either three-dimensional an annular electrode array construction synthetic actuator, PSJA or dimensional modified...
An extensive computational investigation of the effects unsteady wake/blade interactions on transition and separation in low-pressure turbines has been performed by numerical simulations two recent sets experiments using an intermittency transport equation. The considered have Kaszeta Simon Stieger order to investigate periodically passing wakes laminar-to-turbulent turbines. test sections were designed simulate turbine engines for studying their boundary layers separated flow regions over...
Computational fluid dynamics (CFD) has grown as a tool to help understand the hemodynamic properties related rupture of cerebral aneurysms. Few these studies deal specifically with aneurysm growth and most only use single time instance within history. The present retrospective study investigated four patient-specific aneurysms, once at initial diagnosis then follow-up, analyze morphological changes. Aneurysm geometries were segmented via medical image processing software Mimics. meshed...
A transport equation for the intermittency factor is employed to predict transitional flows in low-pressure turbines. The intermittent behavior of taken into account and incorporated computations by modifying eddy viscosity, μt, with factor, γ. Turbulent quantities are predicted using Menter’s two-equation turbulence model (SST). obtained from a which can produce both experimentally observed streamwise variation realistic profile cross stream direction. had been previously validated against...
The use of actuators has been seen as an effective means for controlling flow over plates, airfoils, and turbine blades. plasma is attractive since they lack moving parts can be easily integrated onto different geometries. potential capabilities boundary layer control have demonstrated in numerous experiments. This driven by a body force vector nearly tangent to the surface above embedded electrode actuator. To study effects these numerically, computational model must solve both...
The numerical simulations for two sets of unsteady wake/blade interaction experiments are performed. first experiment considered was conducted by Kaszeta et al. (2001) to study the effects periodically passing wakes on transition and separation in a low pressure turbine passage. second set linear cascade Schobeiri Pappu (1997) which were investigate boundary layer behavior NASA Space Shuttle Main Engine (SSME) blade cascade. In both experiments, moving cylindrical rods used mimic upstream...
Abstract A transport equation for the intermittency factor is employed to predict transitional flows under effects of pressure gradients, freestream turbulence intensities, Reynolds number variations, flow separation and reattachment, unsteady wake-blade interactions representing diverse operating conditions encountered in low-pressure turbines. The intermittent behaviour taken into account incorporated computations by modifying eddy viscosity, μ τ with factor, γ. Turbulent quantities are...