Christoph Brehm, Ph.D.
Adjunct Assistant Professor

Department: Mechanical and Aerospace Engineering
Categories: Faculty
Location: 285 RGAN
Phone: 859-323-4188
Email: christoph.brehm@uky.edu

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Research Interests:

Coherent Structures
Homogeneous Turbulence
Microelectromechanical Systems
Scaling Wall-Bounded Flows
Turbulent Drag Reduction
Turbulent Flows
Unsteady Vortex Flows
Wake Turbulence
Wall Flows

Aerospace Engineering, Ph.D., 2011
Aerospace Engineering, M.S., 2006, University of Arizona, Tucson, AZ
Aerospace Engineering, B.S. (equiv.) 2005, Universität Stuttgart, Stuttgart, Germany

Aug. 2016– current: Assistant Professor, Department of Mechanical Engineering, University of Kentucky, Lexington, KY
Oct. 2015–Aug. 2016: Research Assistant Professor, Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, AZ
Jan. 2012–Oct. 2015: Senior Research Scientist, STC, Advanced Supercomputing Division, Computational Aerosciences Branch, NASA Ames Research Center, Moffett Field, CA

C. Brehm, M. Barad and C. Kiris “Open Rotor Computational Aeroacoustic Analysis with an Immersed Boundary Method,” AIAA 2016-0815, incl. 54th AIAA Aerospace Sciences Meeting, AIAA SciTech, 4-8 January, San Diego, CA
C. Brehm, M. Barad and C. Kiris “An Immersed Boundary Method for Solving the Compressible Navier-Stokes Equations with Fluid-Structure Interaction,” AIAA 2016, incl. presentation at 34th AIAA Applied Aerodynamics Conference, 15-17 June, Washington, DC
C. Brehm “On Consistent Boundary Closures for Compact Finite-Difference WENO Schemes”, Journal of Computational Physics, accepted in November 2016 <Link>
M.F. Barad, C. Brehm, C.C. Kiris, and R. Biswak, “Parallel adaptive high-order CFD simulations characterising SOFIA cavity acoustics”, International Journal of Computational Fluid Dynamics, 2016,Volume 0, 1-7
C. Kiris, M. Barad, J. Housman, C. Brehm, E. Sozer, and S. Moini-Yekta “The LAVA Computational Fluid Dynamics Solver”, Aerospace Science and Technology, 2016, Volume 55, 189-219
C. Brehm, J. A. Housman, and C. C. Kiris “Noise Generation Mechanisms for a Supersonic Jet Impinging on an Inclined Plate”, Journal of Fluid Mechanics, 2016, Volume 797, 802-850
C. Brehm, M. Barad, J. A. Housman, and C. C. Kiris “A Comparison of Higher-Order Shock Capturing Finite Difference Schemes”, Computer and Fluids Journal, 2015, Volume 122, 184-208
C. Brehm, C. Hader, and H. F. Fasel “A Locally Stabilized Immersed Boundary Method for the Compressible Navier-Stokes Equations”, Journal of Computational Physics, 2015, Volume 295, 475-504
M. Barad, C. Brehm, and C. Kiris “Parallel Adaptive High-Order CFD Simulations Characterizing Sofia Cavity Acoustics”, 27th International Conference on Parallel CFD 17-20 May 2015, Montreal,Quebec, Canada
C. Brehm, J. A. Housman, C. C. Kiris and F. Hutcheson “Noise Characteristics of a Four Jet Impingement Device Inside a Broadband Engine Noise Simulator”, AIAA-2015-2211, incl. presentation at 21st AIAA/CEAS Aero-Acoustics Conference, 22-26 June, Dallas, Texas
C. Brehm, M. Barad, and C. Hader “A High-Order Immersed Interface Method for Compressible Flows”, AIAA 2014-2093, incl. presentation at 7th AIAA Theoretical Fluid Mechanics Conference, 16- 20 June 2014, Atlanta, Georgia
C. Hader, C. Brehm, and H. F. Fasel “Numerical Investigation of Transition Delay for Various Controlled Breakdown Scenarios in a Mach 6 Boundary Layer Using Porous Walls”, AIAA 2014-2500, incl.presentation at 7th AIAA Theoretical Fluid Mechanics Conference, 16 – 20 June 2014, Atlanta, Georgia
C. Brehm, S. Moini-Yekta, M. Barad, J. Housman, E. Sozer, and C. Kiris “Partially-Dressed, Cavity Closed Nose Landing Gear Noise Predictions With LAVA”, presentation at 3rd AIAA Workshop on Benchmark Problems for Airframe Noise Computations, 14-15 June 2014, Atlanta, Georgia
C. Kiris, M. Barad, J. Housman, E. Sozer, C. Brehm, and S. Moini-Yekta “The LAVA Computational Fluid Dynamics Solver”, AIAA 2014-0070, incl. presentation at 52nd AIAA Aerospace Sciences Meeting, 13 – 17 January 2014, National Harbor, Maryland
E. Sozer, C. Brehm, and C. Kiris “Gradient Calculation Methods on Arbitrary Polyhedral Unstructured Meshes for Cell-Centered CFD Solvers”, AIAA 2014-1440, incl. presentation at 52nd AIAA Aerospace Sciences Meeting, 13 – 17 January 2014, National Harbor, Maryland
C. Brehm, M. Barad, J. Housman, E. Sozer, S. Moini-Yekta, and C. Kiris “A Comparison of Higher Order Shock Capturing Schemes Within the LAVA CFD Solver”, AIAA 2014-1278, incl. presentation at 52nd AIAA Aerospace Sciences Meeting, 13 – 17 January 2014, National Harbor, Maryland
C. Brehm, and H. F. Fasel “Novel Concept for the Design of Immersed Interface Methods”, Journal of Computational Physics, 2013, Volume 242, 234-267
C. Brehm, A. Gross and H. F. Fasel “Open-Loop Flow Control Investigation for Airfoils at LowReynolds Numbers”, AIAA Journal, 2013, Volume 51, 1843-1860
C. Brehm “Unsteady Simulation of Launch-Site Pressure Environment”, TFAWS-IN-006, presentation at Thermal & Fluids Analysis Workshop (TFAWS), July 31 – August 2, 2013, Daytona Beach, FL
J. A. Housman, C. Brehm, and C. Kiris “Towards Jet Acoustic Prediction Within the Launch Ascentand Vehicle Aerodynamics framework”, The Journal of the Acoustical Society of America, 2013, Volume134, incl. presentation at 166th Meeting of the Acoustical Society of America, San Francisco, California
C. Hader, C. Brehm and H. F. Fasel “Numerical Investigation of Transition Delay Using Porous Walls”, AIAA 2013-2740 , incl. presentation at 43rd AIAA Fluid Dynamics Conference, 24 – 27 Jun 2013, San Diego, CA, USA
C. Brehm, E. Sozer, S. Moini-Yekta, J. Housman, C. Kiris, M. Barad, B. Vu and P. Christopher “Computational Prediction of Pressure and Thermal Environments in the Flame Trench with Launch Vehicles”, AIAA 2013-2538, incl. presentation at 43rd AIAA Fluid Dynamics Conference, 24 – 27 Jun 2013, San Diego, CA, USA
S. Moini-Yekta, M. Barad, J. Housman, C. Kiris, E. Sozer and C. Brehm “Verification and Validation Studies for the LAVA CFD Solver”, AIAA 2013-2448, 43rd AIAA Fluid Dynamics Conference,incl. presentation at 24 – 27 Jun 2013, San Diego, CA, USA
C. Hader, C. Brehm and H. F. Fasel “Numerical Investigation of porous walls for a Mach 6.0 Boundary Layer using an Immersed Interface Method”, AIAA 2013-829, incl. presentation at 51st AIAA Aerospace Sciences Meeting
C. Brehm and H. F. Fasel “Local Stability Enhancement of Immersed Boundary/Interface Methods”,incl. presentation at 7th International Conference on Computational Fluid Dynamics, 2012, ICCFD7-1302, Big Island, Hawaii, USA
S. Moini-Yekta, M. Barad, E. Sozer, J. Housman, C. Brehm and C. Kiris “Towards Hybrid Grid CFD Simulations of the Launch Environment”, incl. presentation at 7th International Conference on Computational Fluid Dynamics, 2012, ICCFD7-3102, Big Island, Hawaii, USA
C. Brehm, C. Hader and H. F. Fasel “Novel Immersed Boundary/Interface Method for the Compressible Navier-Stokes Equations”, AIAA 2012-1110, incl. presentation at 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 9 – 12 Jan 2012, Nashville,Tennessee, USA
C. Brehm, J. Richter and H. F. Fasel “Direct Numerical Simulations of Steady and Unsteady Stenotic Flows”, AIAA 2012-0309, incl. presentation at 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 9 – 12 Jan 2012, Nashville, Tennessee, USA
C. Brehm, F. Reize, and H. F. Fasel “Stability Investigation of Axisymmetric Stenotic Flows”, 2011,1–27, AIAA-2011-3272, incl. presentation at 41st AIAA Fluid Dynamics Conference and Exhibit, 27-30 June 2011, Hawaii, USA
C. Brehm and H. F. Fasel “BiGlobal Stability Analysis as an Initial Value Problem for a Stalled Airfoil”, 2011, 1–28, AIAA-2011-3569, incl. presentation at 41st AIAA Fluid Dynamics Conference and Exhibit, 27-30 June 2011, Hawaii, USA
C. Brehm and H. F. Fasel “Immersed Interface Method for Solving the Incompressible Navier-Stokes Equations with Moving Boundaries”, 2011, 1–19, AIAA-2011-758, incl. presentation at 49th AIAA Aerospace Sciences Meeting, 4-7 January 2011, Orlando, USA
C. Brehm, T. Dackermann, F. Grygier, and H. F. Fasel “Numerical Investigations of the Influence of Distributed Roughness on Blasius Boundary Layer Stability”, 2011, 1–22, AIAA-2011-563, incl. presentation at 49th AIAA Aerospace Sciences Meeting, 4-7 January 2011, Orlando, USA
C. Brehm and H. F. Fasel “An Initial Value Problem Approach to Investigate BiGlobal Stability Problems”, 2011, 1–21, AIAA-2011-1844, incl. presentation at 9th AIAA Aerospace Sciences Meeting,4-7 January 2011, Orlando, USA
C. Brehm and H. F. Fasel “Novel Immersed Interface Method Based on Local Stability Conditions”, 2010, 1–22, AIAA-2010-4432, incl. presentation at 40th Fluid Dynamics Conference and Exhibit, 28 June – 1 July 2010, Chicago, USA
C. Brehm and H. F. Fasel “A Non-Staggered Immersed Interface Method for Solving the Incompressible Navier-Stokes Equations”, 2010, 1–25, AIAA-2010-4433, incl. presentation at 40th Fluid Dynamics Conference and Exhibit, 28 June – 1 July 2010, Chicago, USA
A. Gross, C. Pearman, R. Kremer, B. Napier, C. Gosla, A. Kurz, S. Mack, C. Brehm, B. Heine,A. Radi, B. Marovic, S. Retzko, N. Feindler, B. Zickler, H. F. Fasel and A. Osbrink “1/5 Scale Modelof Aeromot 200S SuperXimango for Scaled Flight Research”, AIAA-2008-6416, 26th AIAA Applied Aerodynamics Conference, Honolulu, 18 – 21 August 2008, Hawaii, USA
C. Brehm, S. Mack, A. Gross and H. F. Fasel “Investigations of an Airfoil at Low Reynolds Number Conditions”, 2008, 1–20, AIAA-2008-3765, incl. presentation at 38th AIAA Fluid Dynamics Conference and Exhibit Agenda, 23 – 26 June 2008, Seattle, USA
S. Mack, C. Brehm and H. F. Fasel “Experimental Investigation of Separation and Separation Controlon a Laminar Airfoil”, 2008, 1–16, AIAA-2008-3766, incl. presentation at 38th AIAA Fluid Dynamics Conference and Exhibit Agenda, 23 – 26 June 2008, Seattle, USA
C. Brehm, A. Gross and H. F. Fasel “Closed-Loop Control of Low-Pressure Turbine Laminar Separation”,2006, 1–13, AIAA-2006-3021, incl. presentation at 4th Flow Control Conference, 5 – 8 June 2006, San Francisco, USA

Computational Fluid Dynamics Lab

Our research group is focused on large-scale, multi-physics simulations that drive novel developments in science and engineering, and help uncover the governing physical mechanisms. Our most recent research includes:

Hypersonic Transition Research

Hypersonic flight vehicles are among the most sophisticated devices ever envisioned. The flow field around hypersonic cruise hardware is highly complex and contains a wide range of intricate physical phenomena, such as transitional and turbulent flows, steady and unsteady shocks, chemical reactions, particulate laden flow. The ability to accurately predict the complex flow field around hypersonic vehicles and provide a sophisticated understanding of the relevant physics is essential to reduce design margins and systems uncertainties and, ultimately, guide the development of novel innovative designs.

Computational Aero-Acoustics

In past experiments and analysis rotation of turbulent flows has been shown to provide a stabilizing effect, such as reducing Reynolds stresses, overall drag and causing the mean velocity profile to appear laminar. The physical mechanisms causing turbulence suppression are currently not well understood, and a deeper understanding of these mechanisms is of great value for many practical examples involving swirling or rotating flows, such as swirl generators, wing-tips, axial compressors, and hurricanes.

Turbulence Physics of Rotating Flows

Research aims at addressing the computational efficiency and model fidelity involved in conducting multi-scale Large-Eddy Simulations (LES). These simulations will be utilized to obtain a detailed understanding of noise generation mechanisms. Acoustics research has been conducted for a wide range of applications, e.g. rocket exhaust, jet impingement noise, and contra-rotating open rotors.

Research

Aeroacoustics

Jet Impingement Noise
Four-Jet Impingement
Open-Rotor Noise Prediction

Fluid-Structure Interaction

Parachute Simulations
Aeroelastic Prediction Workshop
Numerical Methods Development

Hypersonic Transition

Wave-Packet Tracking
Frequency Domain

Relaminarization

Relaminarization of Rotating Turbulent Flows

Christoph Brehm, Ph.D. Adjunct Assistant Professor

Education

Appointments

Publications