A5024178569- Turbomachinery Performance and Optimization
- Computational Fluid Dynamics and Aerodynamics
- Fluid Dynamics and Turbulent Flows
- Refrigeration and Air Conditioning Technologies
- Advanced Aircraft Design and Technologies
- Combustion and flame dynamics
- Heat Transfer Mechanisms
- Tribology and Lubrication Engineering
- Aerodynamics and Fluid Dynamics Research
- Advanced Combustion Engine Technologies
- Wind Energy Research and Development
- Rocket and propulsion systems research
- Real-time simulation and control systems
- Aerodynamics and Acoustics in Jet Flows
- Heat Transfer and Optimization
- Wind and Air Flow Studies
- Advanced Numerical Methods in Computational Mathematics
- Hydraulic Fracturing and Reservoir Analysis
- Gas Dynamics and Kinetic Theory
- Plasma and Flow Control in Aerodynamics
- Cyclone Separators and Fluid Dynamics
- Vibration and Dynamic Analysis
- Advanced Numerical Analysis Techniques
- Drilling and Well Engineering
- Particle Dynamics in Fluid Flows
University of Cincinnati
2015-2024
Glenn Research Center
2008-2024
Durham University
2022
University of Reading
2020-2022
Cleveland Research (United States)
2020
Australian National University
2012-2018
Hartford Financial Services (United States)
2012
Whitney Museum of American Art
2012
General Electric (United States)
1999-2000
Halliburton (United Kingdom)
1997-2000
A workshop on the computational fluid dynamics (CFD) prediction of shock boundary-layer interactions (SBLIs) was held at 48th AIAA Aerospace Sciences Meeting. As part workshop, numerous CFD analysts submitted solutions to four experimentally measured SBLIs. This paper describes assessment predictions. The includes an uncertainty analysis experimental data, definition error metric, and application that metric solutions. provided very similar levels and, in general, it difficult discern clear...
Summary It is now widely acknowledged that continuous oil-spreading films observed in 2D glass-micromodel studies for strongly water-wet three-phase oil, water, and gas systems are also present real porous media, they result lower tertiary-gasflood residual oil saturations than corresponding negative spreading do not display behavior. However, it has yet been possible to directly confirm the presence of media three dimensions, little understood distribution phases within complex geometry...
Abstract Most techniques for pollen-based quantitative climate reconstruction use modern assemblages as a reference data set. We examine the implication of methodological choices in selection and treatment set reconstructions using Weighted Averaging Partial Least Squares (WA-PLS) regression records last glacial period from Europe. show that training used is important because it determines space sampled. The range continuity sampling along gradient more than density. Reconstruction...
A Zero-D cycle simulation of the GE90-94B high bypass turbofan engine has been achieved utilizing mini-maps generated from a high-fidelity simulation. The utilizes Numerical Propulsion System Simulation (NPSS) thermodynamic modeling system coupled to full-engine model represented by set 3D computational fluid dynamic (CFD) component models. Boundary conditions balanced, steady-state are used define boundary in model. Operating characteristics models integrated into via partial performance...
Abstract The hydraulic Channel Fracturing technique relies on the engineered creation of a network open channels within proppant pack, which provides for highly conductive paths flow fluids from reservoir to wellbore. This paper comprehensive summary implementation this in ultra-low permeability, gas-bearing formations. Lance formation Jonah field near Pinedale, Wyoming was selected study. comprises fluvial sand bodies with 0.0005 0.05 mD permeability and 35 55% gas saturation. requires...
A design tool for generating 3D blades various turbomachinery applications using a parametric approach has been developed. The can create variety of blade geometries based on only few basic parameters and limited interaction with CAD system. general creating the is implemented which makes it robust easy to different shapes components. geometric aerodynamic are used 2D airfoils these stacked desired stacking axis. generates specified number sections in Cartesian coordinate These be lofted...
Computational fluid dynamics (CFD) simulations are presented with an isothermal boundary condition at the casing for running NASA Rotor 37. The temperature is set to inlet total temperature. Relative adiabatic simulations, comparison experimental efficiency much improved 100% speed line. difference between and solutions about 1%, matches low-flow test condition. profiles of match data near casing. simulation has a overshoot that been consistently part any CFD this set, typical most...
An explicit Navier–Stokes solver has been written with the option of using one two types turbulence model. One is Baldwin–Lomax algebraic model and other an implicit k–ε which coupled in a novel way. This type coupling, uses different solution methods, unique combines overall robustness simplicity solver. The resulting code applied to flow transonic fan rotor, experimentally investigated by Wennerstrom. Five separate solutions, each identical except for modeling details, have obtained...
A new turbomachinery design system, T-AXI, is described and demonstrated. It intended primarily for use by educators students, although it sophisticated enough actual designs. The codes, example cases, user’s manual are available through the authors’ websites. system can be used to multistage compressors turbines from a small number of physical parameters. Students understand connection between these parameters such as Mach flow angles cross sectional area angular momentum. There also clear...
An analysis of the flow field around a maple seed as it rotates and subsequent comparison to wind turbine blades is discussed. Physical values were determined experimentally from real sample high speed video imaging. Three dimensional computational fluid dynamics was used simulate in autorotation. Expected behaviors have been observed, parallels with performance drawn, potential for higher accuracy explained. Comparison key quantities between true turbines has shown design implications...
A workshop on the computational fluid dynamics (CFD) prediction of shock boundary-layer interactions (SBLIs) was held at 48th AIAA Aerospace Sciences Meeting. As part numerous CFD analysts submitted solutions to four experimentally measured SBLIs. This paper describes assessment predictions. The includes an uncertainty analysis experimental data, definition error metric and application that solutions. provided very similar levels in general it difficult discern clear trends data. For...
The blade geometry design process is integral to the development and advancement of compressors turbines in gas or aeroengines. An airfoil section feature has been added a previously developed open source parametric 3D tool. second derivative mean-line (related curvature) controlled using B-splines create airfoils. This analytically integrated twice obtain mean-line. A smooth thickness distribution then with two options either Wennerstrom quartic B-spline distribution. have also implemented...
Blade designs have evolved from NACA series and free vortex assumptions to detailed meanline forced definitions. A design process is presented with numerous parametric options explore a large space. Smoothness in turbomachinery blade shapes critical an effective design. cubic B-spline used control spanwise variations the curvature definition of airfoil camber, thickness distribution, leading edge definition, inlet angles outlet as parameters small number points. Varying individual sections...
This paper shows a comparison of an unsteady simulation using turbo and average passage for two blade row configuration consisting wake generator followed by transonic rotor. Two spacings were simulated, both close far. The results compare well with experiment especially the profile efficiency difference between An analysis helps to explain unusual seen experimentally that is due radial migration shed vortices negative velocities near tip. In addition, different components body forces...
Abstract The Channel Fracturing technique was introduced for multi-stage well stimulation in the Jonah Field 2010. 622 stages have been pumped with this novel since. Production increases by as much 27% (Johnson et al., 2011) realized over conventional completion methodologies. In previous study, each stage flowed back immediately after treatment. successful introduction of prompted a new attempt to optimize practices eliminating immediate flowback necessary step sustain production...
Abstract We analyse J une : a detailed model of Covid-19 transmission with high spatial and demographic resolution, developed as part the RAMP initiative. requires substantial computational resources to evaluate, making calibration general uncertainty analysis extremely challenging. describe employ Uncertainty Quantification approaches Bayes linear emulation history matching, mimic perform global parameter search, hence identifying regions space that produce acceptable matches observed data.
Several physics-based enhancements are embedded in a low-fidelity general unducted rotor design analysis tool developed, py_BEM, including the local Reynolds number effect, rotational corrections to airfoil polar, stall delay model, high induction factor correction, polar at large angle of attack, exergetic efficiency calculation and momentum-based loss. A wind turbine is analyzed fidelity designed from py_BEM using 3D blade generator. It derived NREL Phase VI rotor. Three variations steady...
Wall functions are used in CFD to provide skin friction values and hence the boundary conditions for flow variables along solid surfaces. In this paper effect of surface roughness on is incorporated a wall function approach which uses Spalding’s formula. The use formula extends method wider range distance than logarithmic law. For applications results then re-formulated explicit calculation throught an additional variable — ratio height from surface. given computational grid information...