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Performance and Algorithms Research

Oscar Antepara

Oscar Antepara
Computer Systems Engineer

I am a CSE in the Performance and Algorithms Research (PAR) Group in the Computing Sciences Directorate at the Lawrence Berkeley National Laboratory.

My expertise lies in the development, implementation, and analysis of numerical methods using high-performance computing (HPC) systems. Before joining PAR, I was a postdoctoral scholar in CCSE at LBNL where I was working on MFIX-Exa, a new CFD-DEM code developed by the National Energy Technology Laboratory and Lawrence Berkeley National Laboratory as part of the U.S. Department of Energy's Exascale Computing Project, then a postdoctoral scholar in ANAG working on high-order finite volume and embedded boundary methods.

I got my Ph.D. in Engineering from the Technical University of Catalonia-BarcelonaTech (UPC) in 2019, where my research focused on developing adaptive mesh refinement algorithms for turbulent and multiphase flows.


N. Overton-Katz, X. Gao, S. Guzik, O. Antepara, D. Graves and H. Johansen. 2023. A Fourth-Order Embedded Boundary Finite Volume Method for the Unsteady Stokes Equations with Complex Geometries. SIAM Journal on Scientific Computing. 

J. Musser, A. Almgren, W. Fullmer, O. Antepara, J. Bell, J. Blaschke, K. Gott, A. Myers, R. Porcu, D. Rangarajan, M. Rosso, W. Zhang, S. Madhava. 2021. MFIX-Exa: A Path Towards Exascale CFD-DEM Simulations. The International Journal of High Performance Computing Applications.

O. Antepara, N. Balcázar, A. Oliva. Tetrahedral adaptive mesh refinement for two-phase flows using conservative level-set method. International Journal for Numerical Methods in Fluids, 2020

N. Balcázar, O. Antepara, J. Rigola, A. Oliva. A level-set model for mass transfer in bubbly flows. International Journal of Heat and Mass Transfer,  2019, 138:335-356.

O. Antepara, N. Balcázar, J. Rigola, A. Oliva. Numerical study of rising bubbles with path instability using conservative level-set and adaptive mesh refinement. Computers and Fluids, 2019, 187:83-97.

F. Favre, O. Antepara, C. Oliet, O. Lehmkuhl, C.D. Pérez-Segarra. An immersed boundary method to conjugate heat transfer problems in complex geometries. Application to an automotive antenna. Applied Thermal Engineering, 2019, 148:907-928.

E. Schillaci, O. Antepara, N. Balcázar, J. Rigola, A. Oliva. A numerical study of liquid atomization regimes by means of conservative level-set simulations. Computers and Fluids, 2019, 179:137-149.

E. Schillaci, L. Jofre, N. Balcázar, O. Antepara, A. Oliva. A low-dissipation convection scheme for the stable discretization of turbulent interfacial flow. Computers and Fluids, 2017, 153:102-117.

 O. Antepara, O. Lehmkuhl, R. Borrell, J. Chiva, A. Oliva. Parallel adaptive mesh refinement for large-eddy simulations of turbulent flows. Computers and Fluids, 2015, 110:48-61.


Conference Papers

Oscar Antepara, Samuel Williams, Scott Kruger, Torrin Bechtel, Joseph McClenaghan, Lang Lao, "Performance-Portable GPU Acceleration of the EFIT Tokamak Plasma Equilibrium Reconstruction Code", Workshop on Accelerator Programming and Directives (WACCPD), November 2023,

Oscar Antepara, Hans Johansen, Samuel Williams, Tuowen Zhao, Samantha Hirsch, Priya Goyal, Mary Hall, "Performance portability evaluation of blocked stencil computations on GPUs", International Workshop on Performance, Portability & Productivity in HPC (P3HPC), November 2023,