A5070252236- Fluid Dynamics and Turbulent Flows
- Fluid Dynamics and Vibration Analysis
- Fluid dynamics and aerodynamics studies
- Central Venous Catheters and Hemodialysis
- Computational Fluid Dynamics and Aerodynamics
- Muon and positron interactions and applications
- Numerical methods for differential equations
- Wind and Air Flow Studies
- Particle accelerators and beam dynamics
- Nanofluid Flow and Heat Transfer
- Advanced Numerical Methods in Computational Mathematics
- Particle Dynamics in Fluid Flows
- Model Reduction and Neural Networks
- Vascular anomalies and interventions
- Experimental and Theoretical Physics Studies
- Rheology and Fluid Dynamics Studies
- Particle Detector Development and Performance
- Plasma and Flow Control in Aerodynamics
- Superconducting Materials and Applications
- Matrix Theory and Algorithms
- Lattice Boltzmann Simulation Studies
- Differential Equations and Numerical Methods
- Gas Dynamics and Kinetic Theory
- Statistical and numerical algorithms
- Vascular Procedures and Complications
Illinois Institute of Technology
2013-2022
Lehigh University
1995-1996
We describe the status of our effort to realize a first neutrino factory and progress made in understanding problems associated with collection cooling muons towards that end. summarize physics can be done factories as well intense cold beams muons. The potential muon colliders is reviewed, both Higgs Factories compact high energy lepton colliders. timescale research development reviewed latest designs channels including promise ring coolers achieving longitudinal transverse simultaneously....
The process of unsteady two-dimensional boundary-layer separation at high Reynolds number is considered. Solutions the non-interactive equations are known to develop a generic singularity in regions where pressure gradient prescribed and adverse. As boundary layer starts separate from surface, however, external distribution altered through viscous—inviscid interaction just prior formation singularity; hitherto this has been referred as first interactive stage. A numerical solution stage...
Background An autogenous arteriovenous fistula is the optimal vascular access for hemodialysis. In case of brachiocephalic fistula, cephalic arch stenosis commonly develops leading to failure. We have hypothesized that a contribution failure low wall shear stress resulting from post-fistula creation hemodynamic changes occur in arch. Methods Twenty-two subjects with advanced renal had fistulae placed. The following procedures were performed at mapping (pre-operative) and maturation (8–32...
Numerical solutions of the unsteady Navier–Stokes equations are considered for flow induced by a thick-core vortex convecting along surface in two-dimensional incompressible flow. The presence induces an adverse streamwise pressure gradient that leads to formation secondary recirculation region followed narrow eruption near-wall fluid boundary-layer equations. locally thickening boundary layer vicinity provokes interaction between viscous and outer inviscid show occurs on two distinct length...
Numerical solutions of the laminar Prandtl boundary-layer and Navier-Stokes equations are considered for case two-dimensional uniform flow past an impulsively-started circular cylinder. We show how Prandtl's solution develops a finite time separation singularity. On other hand is characterized by presence two kinds viscous-inviscid interactions that can be detected analysis enstrophy pressure gradient on wall. Moreover we apply complex singularity tracking method to analyze previous from...
Separation of a supersonic boundary layer (or equivalently hypersonic in region weak global interaction) near compression ramp is considered for moderate wall temperatures. For small angles, the flow vicinity described by classical triple-deck structure governing local viscous-inviscid interaction. The known to exhibit recirculating corner once angle exceeds certain critical value. Here it shown that above second and larger angle, boundary-layer develops an instability. instability appears...
Background. Fistula access in chronic haemodialysis patients is recommended. The first and second choice for location of fistula placement radial-cephalic followed by the brachiocephalic fistula. using cephalic vein often results arch stenosis that less common diabetics unclear reasons. objective current study to determine if geometry differs between non-diabetics.
This paper provides a brief review of the analytical and numerical developments related to unsteady boundary-layer separation, in particular as it relates vortex-induced flows, leading up our present understanding this important feature high-Reynolds-number, surface-bounded flows presence an adverse pressure gradient. In large part, separation has been catalyst for pulling together theory, numerics applications separation. Particular attention is given role that Prof. Frank T. Smith, FRS,...
Numerical simulations of the unsteady, two-dimensional, incompressible Navier-Stokes equations are performed for a Newtonian fluid in channel having symmetric constriction modeled by two-parameter Gaussian distribution on both walls. The Reynolds number based inlet half-channel height and mean velocity ranges from 1 to 3000. Constriction ratios 0.25, 0.5, 0.75 considered. results show that geometry have significant effect behavior post-constriction flow field. solutions observed experience...
Numerical solutions of the unsteady two–dimensional boundary–layer and Navier–Stokes equations are considered for flow induced by a thick–core vortex above an infinite plane wall in incompressible flow. Vortex–induced flows this type generally involve separation, which results eruption high–vorticity fluid within narrow streamwise region. At high Reynolds numbers, separation process is believed to pass through series asymptotic stages. The first stage governed classical non–interactive...
Background: A brachiocephalic fistula is frequently placed for hemodialysis; unfortunately, cephalic arch stenosis commonly develops, leading to failure. We hypothesized that a contribution failure low wall shear stress resulting in neointimal hyperplasia venous stenosis. The objective of this investigation determine correspondence and the development Methods: Forty subjects receiving hemodialysis with primary access were followed from time placement 3 years or until Venogram, Doppler,...
Given the current emphasis on accurate computational fluid dynamics (CFD) modeling of cardiovascular flows, which incorporates realistic blood vessel geometries and cardiac waveforms, it is necessary to revisit conventional wisdom regarding influences non-Newtonian effects. In this study, patient-specific reconstructed 3D geometries, whole viscosity data, venous pulses postdialysis access surgery are used as basis for hemodynamic simulations renal failure patients with native fistula access....
Numerical solutions of the flow induced by a thick-core vortex have been obtained using unsteady, two-dimensional Navier-Stokes equations. The presence causes an adverse pressure gradient along surface, which leads to unsteady separation. calculations Brinckman and Walker for similar identify possible instability, purported be inviscid Rayleigh in region where ejection near-wall vorticity occurs during separation process. In results range Reynolds numbers present investigation, oscillations...
Numerical solutions of the unsteady, two-dimensional Navier–Stokes equations are considered for flow induced by a thick-core vortex with finite difference and spectral element code. The adverse pressure gradient imposed on surface leads to development inflectional velocity profiles formation recirculation region within boundary layer, presence nature an instability that may dominate at high Reynolds numbers. ensues in form high-frequency oscillations vorticity streamwise along wall, dominant...
Gravity currents (GC) are important physical phenomena which transport smoke and hot gases id corridors of buildings. In this paper, they studied using l q e eddy simulations (LES). The transient Navier-Stokes (N-S) equations numerically integrated with very high resolution, in two dimensions resolution three dimensions. LES computations require no adjustable parameters, found to agree well available experimental results the absence heat transfer. Fresh-water/salt-water compared...
The effect of wall cooling on hypersonic boundary-layer separation near a compression ramp is considered. Two cases are identified corresponding to the value average Mach number $\overline{M}$ across upstream boundary layer approaching ramp. flow referred as supercritical for $\overline > 1$ and subcritical $\overline{M} < . interaction described by triple-deck theory, numerical results given both various angles levels cooling. absolute instability recently Cassel, Ruban & Walker...
Dynamic stall occurs on helicopter blades and pitching airfoils when the dynamic-stall vortex, which forms as a result of an unsteady boundary-layer eruption near leading edge, detaches from surface convects into wake airfoil. The vortex is modeled thick-core above infinite plane surface. Numerical solutions Navier-Stokes equations are obtained to determine nature separation detachment processes influence moving wall. Whereas process evolves very differently within two Reynolds number...