Jack Joseph McNamara

Jack Joseph McNamara
The Ohio State University | OSU · Department of Mechanical and Aerospace Engineering

PhD

About

128
Publications
13,446
Reads
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2,372
Citations
Citations since 2017
44 Research Items
1424 Citations
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
Additional affiliations
August 2006 - present
The Ohio State University
Position
  • Professor (Associate)

Publications

Publications (128)
Article
Full-text available
The high-speed fluid–structure interaction (FSI) occurring between a skin panel and a turbulent shock-boundary layer interaction (SBLI) are investigated with large eddy simulations (LES). The SBLI is comprised of a Mach 4 and unit Reynolds number of 2.375×107 (/m) flow interacting with an oblique shock of strength p3/p1≈8.5 and angle σ≈30deg. The i...
Conference Paper
Full-text available
View Video Presentation: https://doi.org/10.2514/6.2022-0292.vid Multi-scale fluid dynamic nonlinearities, such as shock motions, turbulent flow and separation, challenge accurate and efficient treatment of fluid-structural interactions in high-speed flow. Motivated by this, a numerical investigation into the response of a Mach 2.0 separated flow t...
Preprint
Full-text available
Traditional finite element approaches are well-known to introduce spurious oscillations when applied to advection-dominated problems. We explore alleviation of this issue from the perspective of a generalized finite element formulation, which enables stabilization through an enrichment process. The presented work uses solution-tailored enrichments...
Article
Full-text available
The effects of static surface deformations on a spatially developing supersonic boundary layer flow at Mach number M=4 and Reynolds number Reδin≈49300, based on inflow boundary layer thickness (δin), are analyzed by performing large eddy simulations. Two low-order structural modes of a rectangular clamped surface panel of dimensions ≈33δin×48δin ar...
Article
Traditional finite element approaches are well-known to introduce spurious oscillations when applied to advection dominated problems. We explore alleviation of this issue from the perspective of a generalized finite element formulation, which enables stabilization of a linear differential operator through enrichments based on fundamental solutions....
Article
Balancing accurate and efficient estimation of aerothermodynamic loads is a significant challenge for multidisciplinary modeling and analysis of high-speed vehicles. This study focuses on this issue by studying the impact of analytical and data-driven model reductions over a broad operational space. Reduced models are compared with Reynolds-average...
Article
Full-text available
Separated flows arising due to shock-wave/turbulent boundary-layer interactions can cause problematic low-frequency unsteadiness with potentially severe structural response. High-fidelity large-eddy simulations are employed to examine surface morphing as a way to reduce the size of the separation region, and thus favorably alter the unsteadiness ch...
Article
The compounding effects of panel flutter and oblique shock impingement are of great concern to the development of light-weight, high-speed vehicles. Shock-induced panel flutter response is investigated at M=2 and Re=120,000 using the Navier–Stokes equations closely coupled to the von-Kármán equations. A naturally occurring laminar inflow boundary l...
Article
This work discusses the design, measurement, and simulation of an oscillating shock-wave/boundary-layer interaction on a flat plate at Mach 5.8 and Re∞ = 7 × 10^6 m−1. The shock generator is free to pitch and oscillates with a frequency of 42 Hz, resulting in a shock that varies in intensity and impingement point, with a maximum flow-deflection ang...
Conference Paper
Full-text available
Shock wave turbulent boundary layer interaction (SBLI) over a flexible panel is investigated by performing large eddy simulations (LES). The supersonic flow is at Mach 4 and Reynolds number per unit length of 2.375 × 10 7 (/m). The incident oblique shock with the shock strength p 3 /p 1 ≈ 8.5 and shock angle σ ≈ 30 deg impinges near the mid-chord l...
Article
It is well known that for problems approaching incompressible limits, standard finite element approaches suffer from suboptimal convergence due to a phenomenon known as locking. We analyze this phenomenon and present a robust generalized finite element formulation that enables optimal solution convergence. This approach is explored for the two-dime...
Article
An aeroelastic modeling capability of a flexible aircraft with gas turbine engines is developed using a computational fluid dynamics tool as an integration platform. The new modeling capability allows for the typical aeroelastic analysis to include a nonlinear dynamic model of the turbomachinery that is capable of capturing relevant gas dynamics. A...
Article
Efficient modal decomposition of high‐dimensional turbulent flow data is an important first step for data reduction, analysis, and low dimensional predictive modeling. The conventional modal decomposition techniques, such as proper orthogonal and dynamic mode decompositions, aim to represent the system response using spatially global basis vectors...
Article
A surrogate-based modeling strategy is presented for robust and efficient prediction of unsteady aeroelastic loads in the presence of shock-induced separation. Enriched piston theory predictions are extended with a data-driven nonlinear autoregressive with exogenous inputs model to account for hysteresis from the interplay of a dynamically deformin...
Article
The potential of surface morphing techniques, including passive shock control bumps (SCB) and active surface morphing, is explored to control transitional shock wave boundary layer interactions (SWBLI). In addition to reducing the size of the separation bubble, a key objective is to mitigate the low-frequency unsteadiness that can cause detrimental...
Article
Full-text available
A three-dimensional transitional shock boundary layer interaction (SWBLI) over a finite-span flexible panel is investigated by performing direct numerical simulations (DNS). The laminar inflow is at Mach 2, on which an oblique shock of turn angle 5.62∘ is imposed. The shock impinges at the mid-chord length of the panel, giving rise to flow separati...
Article
A new surrogate modeling approach is developed that augments the loads from an analysis over an undeformed surface in order to account for the effects of static surface deformations in high-speed flows. The approach relies on pointwise data-driven surrogates to approximate the nonlinear flow mechanics and theoretical expressions to identify the sur...
Article
Turbine-wake interactions pose significant challenges in the development of wind farms. These interactions can lead to an increase in wind energy cost through reduction in wind farm power efficiency as well as a reduction of functional turbine lifetime. The overall objective of this work is to assess the free vortex wake (FVW) approach for capturin...
Article
This study assesses the robustness and efficiency of the enriched piston theory approach for modeling aeroelastic loads in the presence of impinging shocks. Both stationary and oscillating shock impingements are considered in two- and three-dimensional flows, with benchmark solutions provided by Euler and Reynolds-averaged Navier-Stokes models. For...
Article
Oblique shockwaves may impinge on supersonic vehicles internally in an engine or externally on the outer mold line. They create a severe loading environment and may induce dynamic instabilities such as panel flutter. This study computationally explores the effect of shock-induced panel flutter response in 3D, inviscid, Mach 2 flow. Flutter behavior...
Article
Because of the highly integrated nature of their dynamics, flapping-wing micro air vehicles exhibit significant coupling, including interactions between aeroelastic wing behavior, actuator dynamics, and control systems. An existing model-based controller is demonstrated to exhibit reduced tracking performance and even closed-loop instability when e...
Article
Full-text available
Galerkin projection is a commonly used reduced order modeling approach; however, stability and accuracy of the resulting models are open issues for unsteady flow fields. Balance between production and dissipation of energy is crucial for stability. Moreover, the rates of energy production and dissipation are functions of large- and small-scale info...
Article
This study focuses on the development of time-marching procedures for efficient and accurate fluid-thermal-structural analysis with time-accurate computational fluid dynamics. The developed procedures are based on a loosely coupled, partitioned framework for the fluid, thermal, and structural solvers—each with different second-order time integrator...
Article
The pursuit of improved fuel economy through weight reduction, reduced manufacturing costs, and improved crash safety can result in increased compliance in automobile structures. However, with compliance comes an increased susceptibility to aerodynamic and vibratory loads. The hood in particular withstands considerable aerodynamic force at highway...
Article
Shock wave/boundary-layer interactions represent an extreme loading condition in the structural design of high-speed flight vehicles. However, the complexity of this problem has primarily restricted study to rigid, undeformed surfaces. As such, little is known regarding the impact surface deformation, due to structural compliance, has on the induce...
Article
A computationally tractable nonlinear aeroelastic model of a bioinspired flapping-wing micro air vehicle, which includes motor dynamics and is suitable for control evaluation, is developed in this paper. The structural model accounts for geometrically nonlinear deformations using an implicit condensation technique. The aerodynamic loads are compute...
Article
The inherent relationship between boundary-layer stability, aerodynamic heating, and surface conditions makes the potential for interaction between the structural response and boundary-layer transition an important and challenging area of study in high-speed flows. This interdependence implies that accurate structural response prediction of a hyper...
Article
Basis identification is a critical step in the construction of accurate reduced-order models using Galerkin projection. This is particularly challenging in unsteady flow fields due to the presence of multi-scale phenomena that cannot be ignored and may not be captured using a small set of modes extracted using the ubiquitous proper orthogonal decom...
Article
The inherent relationship between boundary-layer stability, aerodynamic heating, and surface conditions makes the potential for interaction between the structural response and boundary-layer transition an important and challenging area of study in high-speed flows. This paper phenomenologically explores this interaction using a fundamental two-dime...
Article
This paper describes an effort toward characterizing the role of material plasticity on the structural response and operational life of compliant panels in high-speed flow. A fluid-thermal-structural-material interactions framework is used to investigate the response of elastic and elastic-plastic panels subjected to multiple loading cycles. The pl...
Article
Wind turbines are currently a rapidly expanding form of renewable energy. However, there are numerous technological challenges that must be overcome before wind energy provides a significant amount of power in the United States. One of the primary challenges in wind turbine design and analysis is accurately accounting for the aerodynamic environmen...
Chapter
The inherent relationship between boundary layer stability, aerodynamic heating, and surface conditions make the potential for interaction between the structural response and boundary layer transition an important and challenging area of study in high speed flows. This interdependence implies that accurate structural response prediction of a hypers...
Chapter
Basis identification is a critical step in the construction of accurate reduced order models using Galerkin projection. This is particularly challenging in unsteady nonlinear flow fields due to the presence of multi-scale phenomena that cannot be ignored and are not well captured using the ubiquitous Proper Orthogonal Decomposition. This study focu...
Article
Fluctuating pressures are a critical consideration in the life-prediction of thin-gauge hot-structures operating in high-speed flow. Sources include both boundary layer turbulence and self-induced components, where the latter arises from panel vibrations. While a considerable body of research is available for the structural response of thin-gauge p...
Article
This study examines time-marching procedures for fluid-thermal-structural analysis using time-accurate thermal and structural solvers combined with quasi-steady aerothermodynamic models. Four coupling schemes are considered, including a conventional scheme with explicit time integration, a basic loose coupling scheme with implicit time integration,...
Conference Paper
Full-text available
The inherent relationship between the state of the boundary layer, aerodynamic heating, and surface conditions make the potential for interaction between the structural response and boundary layer transition an important and challenging area of study in high speed flows. This paper phenomenolog-ically explores this interaction using a fundamental a...
Conference Paper
Wind energy is a renewable energy option that has made great advances in recent years. However, there are several issues that limit its growth. A significant challenge is wind farm configuration, where the energy density in the farm is limited due to interactions between turbines caused by the shed wakes. This paper discusses an on-going effort to...
Conference Paper
A capability needed for the development of high-speed systems is accurate and efficient prediction of aerodynamic pressure, particularly for light-weight systems where the unsteady aerodynamic loads may be strongly coupled with the structural response. This is particularly challenging in shockdominated environments (i.e., inlets, near control surfa...
Conference Paper
This paper describes an on-going effort towards predicting the role of material plasticity in the structural response of compliant panels in high speed ow. This work is an extension of a previous study, where a uid-thermal-structural-material interactions frame- work is used to investigate the response of elastic and elastic-plastic panels subjecte...
Conference Paper
The present work is the culmination of a series of investigations by the authors on the construction and validation of structural, thermal, and coupled structural-thermal reduced order models (ROMs) for the prediction of the displacements and temperature fields on a representative panel of a hypersonic aircraft during a particular trajectory. The f...
Conference Paper
A unique issue of reusable ultra-high-speed flight vehicles is the presence of continually evolving material and structural states; necessitating multi-scale analysis of components over long time records. This leads to a significant computational bottleneck due to the need to carry out an extreme number of time iterations, and only limited ability to...
Conference Paper
Basis identification is a critical step in the construction of accurate reduced order models using Galerkin projection. This is particularly challenging in unsteady flow fields due to the presence of multi-scale phenomena that cannot be ignored, and are not well captured using the ubiquitous Proper Orthogonal Decomposition. This study focuses on this...
Article
Structural response of hypersonic aircraft panels is a multi-disciplinary problem, where the nonlinear structural dynamics, aerodynamics, and heat transfer models are coupled. Computing these fluid-thermal-structural interactions is complex and prohibitively expensive when high fidelity models are used (i.e., CFD and FEA). To reduce the computation...
Article
Full-text available
This work investigates the effect of two-dimensional surface deformations on hypersonic boundary-layer stability. The deformations are obtained from previous research and represent the characteristic response of integrated thermal protection system panels due to combined aerodynamic and thermal loading. Boundary-layer stability is assessed using li...
Article
One of the primary challenges in the development of high-speed systems is accurate and efficient prediction of the aerodynamic heating, particularly for lightweight systems where there is a potential for strong coupling between the aerothermodynamic loads and the structural response. A novel approach is developed that corrects heat flux predictions...
Article
A wind turbine rotor blade, based on the U.S. National Renewable Energy Laboratory (NREL) 5 MW reference turbine, is optimized for minimum cost of energy through simultaneous consideration of aerodynamics and bend-twist coupling. Eighty-three total design variables are considered, encompassing airfoil shapes, chord and twist distributions, and the...
Article
Full-text available
This study sets the framework for uncertainty propagation in hypersonic aeroelastic and aerothermoelastic stability analyses. First, the aeroelastic stability of typical hypersonic control surface section is considered. Variability in the uncoupled natural frequencies of the system are modeled using beta probability distributions. Uncertainty is pr...
Conference Paper
A preliminary assessment is developed for long time record modeling and simulation of coupled flow-structural response of thin-gauge panels subject to shock impingements. The study is based on a set of recent discovery experiments carried out by the Air Force Research Laboratory. The fluid loads are modeled using a CFD surrogate for the steady surf...
Conference Paper
The application of reduced order modeling (ROM) techniques to hypersonic structures has gained significant momentum in recent years owing to its ability to deliver accurate structural-thermal response predictions with reduced computational costs relative to full order methods. Accurate response prediction is dependent on the selection of an appropr...
Conference Paper
A computationally efficient approximate aeroelastic model suitable for control studies is developed. The structural model accounts for geometrically nonlinear behavior using an implicit condensation technique. The aerodynamic loads are calculated using a quasi-static model that is fit using data obtained from an unsteady discrete vortex approach. T...
Article
This study focuses on the development of a subiteration free, loosely coupled partitioned time marching procedure for fluid-thermal-structural analysis using time-accurate thermal and structural solvers combined with surrogate fluid models. The scheme is specifically formulated to maintain global second-order temporal accuracy using implicit solver...
Conference Paper
Fluctuating pressures are a critical consideration in the life-prediction of thin-gauge hot-structures operating in high-speed flow. Sources include both boundary layer turbulence and self-induced components, where the latter arises from panel vibrations. While a considerable body of research is available for the structural response of thin-gauge p...
Conference Paper
One of the primary challenges in the development of high-speed systems is accurate and efficient prediction of the aerodynamic heating, particularly for light-weight systems where the aerothermodynamic loads are strongly coupled with the structural response. This study builds upon previous work focused on using CFD surrogates for prediction of aero...
Conference Paper
Accurate prediction of the boundary layer transition location is essential to the design and development of hypersonic vehicles since turbulent heat transfer rates increase by a factor of 3 to 8 relative to laminar flow. While recent research has focused on this need, there is only limited understanding in the interaction between hypersonic boundar...
Conference Paper
This study focuses on the development of a loosely coupled partitioned multi-physics time marching procedure for fluid-thermal-structural analysis using time-accurate high-fidelity models. The scheme is specifically formulated to maintain global second order temporal accuracy using implicit second order solvers for each discipline, and requires no...
Article
A key need for enabling sustained and responsive hypersonic ight is life assessment of aerospace structures in the extreme operating environment. Surface panels in particular are subject to intense uctuating pressure loads and heating that lead to damage and failure over time. Thus, a key need for life assessment of these structures is the ability...
Conference Paper
A comprehensive flapping wing micro air vehicle (MAV) model - which includes interactions between flight weight motors, drive-train, and flexible wings - is developed to enable improved vehicle and controller design. Additionally, a fundamental experimental configuration is developed for model validation. Initial comparisons reveal similar trends....
Conference Paper
Wind turbines are currently a rapidly expanding form of renewable energy. However, there are numerous technological challenges that must be overcome before wind energy provides a significant amount of power in the United States. One of the primary challenges in wind turbine design and analysis is accurately accounting for the aerodynamic environmen...
Conference Paper
Fluid-Thermal-Structural interactions play an important role in the development of high speed vehicles, impacting various sub-disciplines (i.e., aerodynamic, structural, material, propulsion, and control) at the micro, component and/or vehicle scales. This study focuses on the development of a partitioned fluid-thermal-structural procedure aimed at...
Conference Paper
Accurate heat transfer prediction is essential to the design and development of hot structure hypersonic vehicles. Thermo-mechanical compliance is an inherent feature of hot structure hypersonic vehicles, necessitating consideration of fluid-thermal-structural interactions. Additionally, one of the largest sources of uncertainty in heat transfer pr...
Article
A primary challenge for aerothermoelastic analysis in hypersonic flow is accurate and efficient computation of unsteady aerothermodynamic loads. This study examines two model reduction strategies with the goal to enable the use of computational fluid dynamics within a long time-record, dynamic, aerothermoelastic analysis. One approach seeks to expl...
Article
Accurate heat transfer prediction is essential to the design and development of hot structure hypersonic vehicles. Thermo-mechanical compliance is an inherent feature of hot structure hypersonic vehicles, necessitating consideration of fluid-thermal-structural interactions. Additionally, one of the largest sources of uncertainty in heat transfer pr...
Article
The analysis, and ultimately the design, of air-breathing hypersonic cruise-type vehicles is hampered by the inability to accurately capture the coupled fluid–thermal–structure interactions. There are few laboratory experiments that have investigated the interactions of compliant surface panels and hypersonic flow. The vast majority of experimental...
Article
The goal of the United States Air Force to field durable platforms capable of sustained hypersonic flight and responsive access to space depends on the ability to predict the response and the life of structures under combined aerothermal and aeropressure loading. However, current predictive capabilities are limited for these conditions due in part...
Article
Wind turbines are emerging as an exciting and rapidly expanding form of renewable energy. However, there are numerous technological challenges that must be overcome before wind energy provides a significant amount of power in the United States. One of the primary challenges in wind turbine design and analysis is accurately accounting for the wake....