1. 2D Laminar Flame for Ozone Combustion
PECOS Center Research
Applications
Wall Bounded Turbulent Flows
External Aerodynamics
Combustion
Magnetically Confined Plasma
Algorithms & Modeling
Predictive Validation and UQ
Model Inadequacy
Forward and Inverse Problems
Hybrid LES & RANS turbulence
models
Direct Numerical Simulation of
Turbulence
Bayesian Methods
Affiliated Faculty
Ivo Babuska
Omar Ghattas
Tom Hughes
Tinsley Oden
Greg Rodin
Philip Varghese
Robert Moser
Director
Research Staff: Danial Faghihi, Damon McDougal, Craig Michoski, Todd Oliver, Chris Simmons, Roy Stogner
Brief description of some of the research activities in PADAS:
Fast algorithms for robust (i.e., automatic, black box) analysis for medical images.
Typically, problem-specific algorithms
Top left image: MRI FLAIR Image of patient with Grade IV glioma.
Top right image: Estimated segmentatio to Grey matter, white matter, cerebrospinal fluid, and tumor
Bottom image:
Spatial frequency of adult glioblastoma with 3D surface rendering (top) and 2D multiplanar slices (bottom). These tumors tend to appear much more frequently in some brain regions, and this depends on age. The Statistical atlas was constructed with registration algorithms.
2D Laminar Flame for Ozone Combustion
Funding: DOE, SNL, NASA, GE, DOD

2. Wall Bounded Turbulent Flows - PECOS
DOF: 544 billion
CPU time: 400 mil core-hr with 524k cores (MIRA, ANL)
Generated Data: 137 TBytes (76 snapshots, 1.8 TBytes / snapshot)
Largest simulation of wall-bounded turbulent flow ever performed
Coherent vortex structure of wall- bounded turbulence.
Each tube represents a single vortex core.

3. Hybrid RANS/LES - PECOS
Hybrid RANS/LES turbulence models are useful in many engineering flows (e.g. cars and planes)
A new model addresses shortcoming in previous hybrid models
The PECOS hybrid model is applicable to a wide range of complex turbulent flows
Evolution of a stalled airfoil after a stall-control actuation pulse. The pulse causes the separated flow to partially reattach resulting in increased lift and reduced drag. The simulation was performed with the new hybrid RANS/LES model developed at PECOS.