ParticleSurface Tribology Analysis Code (PSTAC): HighPerformance Computing Tribology and Multiphase CFD Computing
The Carnegie Mellon ParticleSurface Tribology Analysis Code (PSTAC) developed by Particle Flow and Tribology Lab (PFTL) is an inhouse multiphysics C++ code which captures the physics of the fluid and particle dynamics coupled with the motion of solids. It can simultaneously work at the levels of particles and macro solids. It solves the transient, 3D NavierStokes equations, using an efficient, meshing scheme for complex geometries. This helps to exploit the ease/simplicity of calculations and efficiently deal with complex solid geometries (e.g., the drillbit) without complex meshing. The postprocessed results, generated from PSTAC's data, are shown. 
Simulation of ParticleFluidSurfaceInteraction during Rock Drilling

PFTL Research Assistant(s): 

Jeremiah N. Mpagazehe; Prathamesh S. Desai 
Method(s) Employed: 

Computational Fluid Dynamics (CFD),
Particle Dynamics (PD), ParticleFluidSurface Interaction (PFSI) 
Rig(s) and/or Software(s) Employed: 

C++ 
Sponsor(s): 

National Science Foundation (NSF), National Aeronautics and Space Administration (NASA), Alfred P. Sloan Foundation 
Sample Results:
Select PFTL References:
Mpagazehe, J.N., Queiruga, A.F., Higgs III, C.F., 2013, "Towards an understanding of the drilling process for fossil fuel energy: A continuum discrete approach" Tribology International, 59, pp. 273283.
Mpagazehe, J.N., Higgs III, C.F., 2013, "A threedimensional transient model to predict interfacial phenomena during chemical mechanical polishing using computational fluid dynamics." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 227.7, pp. 777786.
PFTL PhD Thesis:
Mpagazehe, J.N., 2013, "A Physicsbased, EulerianLagrangian Computational Modeling Framework to Predict Particle Flow and Tribology Phenomena", Doctoral Thesis , Carnegie Mellon University
