Research Scientist
Chevron Technical Center
Computational Physics, Applied Mathematics, Numerical Methods, Programming, Parallel Computing
Multiscale Algorithms, Multiphysics Coupling, Flow in Porous Media, Physics of Multiphase Flow, Pore-Scale Modeling, Reservoir Simulation, Upscaling, Fractured Media, Geomechanics
Chevron Technical Center
March 2019 – present
– GEOS multiphysics simulator research and development
– Intersect-Multiscale reservoir simulator research and development
August 2015 – February 2019
Leading developer and project manager of Automatic Differentiation General Purpose Research Simulator (AD-GPRS)
– General coupling framework for multiphysics reservoir simulation
– Sequential formulations for multiphase multicomponent flow and transport
– Study of coupling schemes for poroelasticity/poroplasticity
– Reactive transport modeling with non-Darcy effects
– Uncertainty propagation for multiphase/multicomponent flow
– Parallelization for shared and distributed memory systems
University of Lausanne
March 2012 – June 2015
– Multiphysics (hybrid) multiscale (in space and time) finite volume method coupling Darcy- and pore-scale descriptions for two-phase flows in porous media
– Adaptive pore/Darcy-scale resolution for drainage-imbibition cycles
– Spatiotemporal adaptive multiscale simulation of density-driven instabilities
– Investigation the limits of macroscopic models using the numerical averaging approach
– Extension of the developed multiphysics framework for geomechanical problems
– Teaching assistant
Keldysh Institute for Applied Mathematics RAS
July 2011 – February 2012
– Models and algorithms for multiphase multicomponent non-isothermal simulation of unconventional reservoirs
– Scalable parallel algorithms for reservoir simulation
NC DIT Delta
April 2006 – June 2011
– Black-oil reservoir simulation software development and support
– Methods and algorithms for efficient simulation of flow in fractured reservoirs
– Coupling of reservoir and surface facilities simulators
– Optimization algorithm for wells placement
– Parallel version of the reservoir simulator
– Benchmarking against Eclipse/Tempest MORE/tNavigator
– Managing research group in the field of upscaling and fractures
Faculty of Problems of Physics and Energetics
Scientific Advisor: Prof. Anna Pergament
Ph.D. in Applied Mathematics and Computational Physics (2011) – “Mathematical Modeling of Multiphase Flow in Fractured Media”
Master of Science in Applied Physics and Mathematics (2008) – “Investigation of Multiphase Flow Problems in Fractured Media”
Bachelor of Science in Applied Physics and Mathematics (2006) – “Inverse Problem of Measuring the Ultrashort Laser Pulse Parameters”
S. Waziri, G. Ren, P. Tomin, B. Guyaguler. Nonlinear Acceleration of the Iterative-Sequentially Coupled Flow and Geomechanics Fixed Stress Scheme. Rock Mechanics and Rock Engineering, 2025.*
R. Hasanzade, P. Tomin, H. Tchelepi. Adaptive Conservative Explicit/Implicit Method that Overcomes the Global Limit on the Timestep Size. SPE-223925-MS, SPE Reservoir Simulation Conference, Galveston, Texas, USA, March 2025.
G. Ren, P. Tomin, B. Guyaguler, X. Wen. Numerical Investigation of the Poroelasticity Impact on Hydraulic Fracturing. SPE-223905-MS, SPE Reservoir Simulation Conference, Galveston, Texas, USA, March 2025.
V. Magri, N. Castelletto, D. Osei-Kuffuor, R. Settgast, M. Cusini, W. Tobin, R. Aronson, P. Tomin. A Multigrid Reduction Framework for Efficient and Scalable Multiphysics Simulations. SPE-223898-MS, SPE Reservoir Simulation Conference, Galveston, Texas, USA, March 2025.
J. An, S. Waziri, G. Ren, P. Tomin, Y. Li, K. Zaki. Study on Coupling Parameters for Flow-Geomechanics Simulation Schemes. SPE-223890-MS, SPE Reservoir Simulation Conference, Galveston, Texas, USA, March 2025.
R. Aronson, P. Tomin, N. Castelletto, F. Hamon, J. White, H. Tchelepi. Pressure stability in explicitly coupled simulations of poromechanics with application to CO2 sequestration. Computer Methods in Applied Mechanics and Engineering, V. 435, 2024.*
R. Settgast, R. Aronson, J. Besset, A. Borio, Q. Bui, T. Byer, N. Castelletto, A. Citrain, B. Corbett, J. Corbett, P. Cordier, M. Cremon, C. Crook, M. Cusini, F. Fei, S. Frambati, J. Franc, A. Franceschini, M. Frigo, P. Fu, T. Gazzola, H. Gross, F. Hamon, B. Han, Y. Hao, R. Hasanzade, M. Homel, J. Huang, T. Jin, I. Ju, D. Kachuma, M. Karimi-Fard, T. Kim, S. Klevtsov, A. Lapene, A. Mazuyer, M. N'diaye, D. Osei-Kuffuor, S. Povolny, G. Ren, S. Semnani, C. Sherman, M. Rey, H. Tchelepi, W. Tobin, P. Tomin, L. Untereiner, A. Vargas, S. Waziri, X. Wen, J. White, H. Wu. GEOS: A performance portable multi-physics simulation framework for subsurface applications. Journal of Open Source Software, V. 9 (102), 2024.*
H. Gross, R. Settgast, R. Aronson, A. Borio, Q. Bui, N. Castelletto, B. Corbett, P. Cordier, M. Cremon, M. Cusini, S. Frambati, J. Franc, T. Gazzola, F. Hamon, J. Huang, D. Kachuma, M. Karimi-Fard, S. Klevtsov, A. Lapene, V. Magri, A. Mazuyer, M. N’diaye, D. Osei-Kuffuor, C. Sherman, H. Tchelepi, W. Tobin, P. Tomin, X. Wen, J. White. GEOS: Exascale, Multiphysics, Open-Source Simulation for CCS. 19th European Conference on the Mathematics of Geological Reservoirs, 2024.
S. Waziri, G. Ren, P. Tomin, B. Guyaguler. Nonlinear acceleration of the iterative-sequentially coupled flow and geomechanics fixed stress scheme. 58th U.S. Rock Mechanics/Geomechanics Symposium, Golden, Colorado, USA, 2024.
S. Lee, P. Tomin, Y. Efendiev. Convergent sequential fully implicit method for reservoir simulation. Journal of Computational Physics, 2023.*
J. Jiang, P. Tomin, H. Tchelepi. Accelerated Nonlinear Domain Decomposition Solver for Multi-phase Flow and Transport in Porous Media. Journal of Computational Physics, 2023.*
S. Watanabe, J. Natvig, P. Tomin. Strongly Coupled Prolongation in Multiscale Pressure Solver for High-Contrast Heterogeneous Reservoir Simulation. SPE-212231-MS, SPE Reservoir Simulation Conference, March 2023.*
J. Natvig, D. Dias, F. Bratvedt, S. Watanabe, Z. Li, A. Kozlova, P. Tomin, J. Jiang, X. Shi. Multiscale Reservoir Simulation of High-Resolution Models. SPE-212231-MS, SPE Reservoir Simulation Conference, March 2023.*
J. Li, P. Tomin, H. Tchelepi. Sequential fully implicit Newton method for flow and transport with natural black-oil formulation. Computational Geosciences, 2023.*
Y. Zhou, J. Jiang, P. Tomin. Inexact Methods for Black-Oil Sequential Fully Implicit SFI Scheme. SPE-203900-MS, SPE Reservoir Simulation Conference, October 2021.*
J. Li, P. Tomin, H. Tchelepi. Sequential fully implicit Newton method for compositional flow and transport. Journal of Computational Physics, 2021.*
J. Jiang, P. Tomin, Y. Zhou. Inexact methods for sequential fully implicit (SFI) reservoir simulation. Computational Geosciences, 2021.*
O. Fuks, F. Ibrahima, P. Tomin, H. Tchelepi. Uncertainty Propagation for Compositional Flow Using a Probability Distribution Method. Transport in Porous Media, V. 132(1), P. 113–133, 2020.*
J. Li, Z. Y. Wong, P. Tomin, H. Tchelepi. Sequential implicit Newton method for coupled multi-segment wells. SPE-193833-MS, SPE Reservoir Simulation Conference, Galveston, Texas, USA, 10-11 April 2019.*
S. Gries, B. Metsch, K. Terekhov, P. Tomin. System-AMG for fully coupled reservoir simulation with geomechanics. SPE-193887-MS, SPE Reservoir Simulation Conference, Galveston, Texas, USA, 10-11 April 2019.*
O. Fuks, F. Ibrahima, P. Tomin, H. Tchelepi. Analysis of travel time distributions for uncertainty propagation in realistic heterogeneous porous systems. Transport in Porous Media, SI: Uncertainty Quantification and Multiple Scale Methods, V. 126(1), P. 115–137, 2019.*
P. Tomin, D. Voskov. Robust and accurate formulation for modeling of acid stimulation. Proceedings of the 16th European Conference on the Mathematics of Oil Recovery, Barcelona, Spain, 3-6 September, 2018.
T. Garipov, P. Tomin, R. Rin, D. Voskov, H. Tchelepi. Unified thermo-compositional-mechanical framework for reservoir simulation. Computational Geosciences, V. 22(4), P. 1039–1057, 2018.*
R. Shaik, P. Tomin, D. Voskov. Modelling of near-well acidization. 43rd Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, February 12-14, 2018.
R. Rin, P. Tomin, T. Garipov, D. Voskov, H. Tchelepi. General implicit coupling framework for multi-physics problems. SPE-182714-MS, SPE Reservoir Simulation Conference, Montgomery, Texas, USA, 20-22 February 2017.*
P. Tomin, I. Lunati. Investigating Darcy-scale assumptions by means of a multiphysics algorithm. Advances in Water Resources, SI: Pore scale modeling and experiments, V. 95, P. 80–91, 2016.*
P. Tomin, I. Lunati. Spatiotemporal adaptive multiphysics simulations of drainage-imbibition cycles. Computational Geosciences, V. 20(3), P. 541–554, 2016.*
P. Tomin, I. Lunati. Local-global splitting for spatiotemporal-adaptive multiscale methods. Journal of Computational Physics, V. 280, P. 214–231, 2015.*
P. Tomin, I. Lunati. Spatiotemporal adaptive multiscale multiphysics simulations of two-phase flow. Proceedings of the 14th European Conference on the Mathematics of Oil Recovery, Catania, Sicily, Italy, 8–11 September 2014.
R. Künze, P. Tomin, I. Lunati. Local modeling of instability onset for global finger evolution. Advances in Water Resources, V. 70, P. 148–159, 2014.*
D. Mitrushkin, P. Tomin. Simulation of flow in vuggy porous media. Actual Problems of Oil and Gas, V. 9, N. 1, 2014 (in Russian).
P. Tomin, I. Lunati. Hybrid multiscale finite volume method for two-phase flow in porous media. Journal of Computational Physics, V. 250, P. 293–307, 2013.*
P. Tomin, A. Pergament. Single porosity model for fractured formations. Proceedings of the 13th European Conference on the Mathematics of Oil Recovery, Biarritz, France, 10–13 September 2012.
P. Tomin, I. Lunati, A. Ferrari, R. Kuenze. A framework for hybrid simulations of two-phase flow in porous media. Proceedings of the 13th European Conference on the Mathematics of Oil Recovery, Biarritz, France, 10–13 September 2012.
A. Pergament, P. Tomin. The study of relative phase-permeability functions for anisotropic media. Mathematical Models and Computer Simulations, V. 4, N. 1, P. 1–9, 2012.*
A. Pergament, V. Semiletov, P. Tomin. On some multiscale algorithms for sector modeling in multiphase flow in porous media. Mathematical Models and Computer Simulations, V. 3, N. 3, P. 365–374, 2011.*
S. Akhmedsafin, S. Kirsanov, A. Laperdin, A. Krasovskiy, A. Balashov, D. Mitrushkin, P. Tomin. Search for the best solution for choosing the location of planned wells in the gas deposit area. Bulletin of the CDC Rosnedra, N. 2, P. 35–42, 2011 (in Russian).*
A. Pergament, V. Semiletov, P. Tomin. Multiscale method for numerical simulation of multiphase flows in giant production fields. Proceedings of the 12th European Conference on the Mathematics of Oil Recovery, Oxford, England, 6–9 September 2010.
A. Pergament, V. Semiletov, P. Tomin. Up- and down-scaling in filtration problem with anisotropic coefficients. Bulletin of the CDC Rosnedra, N. 4, P. 23–30, 2010 (in Russian).*
A. Pergament, V. Semiletov, P. Tomin. Multiscale asynchronous algorithms based on the superelement method for multiphase flow. Proceedings of the 11th European Conference on the Mathematics of Oil Recovery, Bergen, Norway, 8–11 September 2008.
A. Pergament, V. Semiletov, P. Tomin. Mathematical modeling of multiphase flow in fractured media. Proceedings of the 11th European Conference on the Mathematics of Oil Recovery, Bergen, Norway, 8–11 September 2008.
D. Maksimov, A. Tikhonov, P. Tomin. Parallel computation application for reservoir simulation. Bulletin of the CDC Rosnedra, N. 2, P. 69–78, 2007 (in Russian).*
* – peer-reviewed
M. Thomadakis, P. Tomin, A. Loddoch, V. Magri. A Pragmatic Approach to Optimize Execution Time and Cost of Complex Coupled-Physics Codes in Chevron’s HPC. Energy HPC Conference, Rice University, Houston, Texas, USA, February 25–27, 2025.
Z. Y. Wong, J. Li, P. Tomin, H. Tchelepi. Sequential-Implicit Newton Method for Reservoir Simulation. SIAM Conference on Mathematical and Computational Issues in the Geosciences, Houston, Texas, USA, March 11–14 2019.
O. Fuks, F. Ibrahima, P. Tomin, H. Tchelepi. Distribution-Based Method for Uncertainty Propagation of Compositional Displacements. SIAM Conference on Mathematical and Computational Issues in the Geosciences, Houston, Texas, USA, March 11–14 2019.
P. Tomin, D. Voskov. Darcy-Brinkman-Stokes Framework for Modeling of Reactive Dissolution. SIAM Conference on Mathematical and Computational Issues in the Geosciences, Houston, Texas, USA, March 11–14 2019.
P. Tomin, R. Rin, Y. Wong, T. Garipov, D. Voskov, H. Tchelepi. AD-GPRS: flexible and efficient multiphysics multiscale research platform. 9th International Conference on Porous Media & Annual Meeting, Rotterdam, Netherlands, May 8–11 2017.
O. Fuks, F. Ibrahima, P. Tomin, H. Tchelepi. Analysis of travel time distributions for uncertainty propagation in realistic heterogeneous porous systems. 9th International Conference on Porous Media & Annual Meeting, Rotterdam, Netherlands, May 8–11 2017.
P. Tomin, I. Lunati. A multiphysics framework to learn and predict in presence of multiple scales. AGU Fall Meeting, San Francisco, California, USA, 14–18 December 2015.
I. Lunati, P. Tomin. Spatiotemporal adaptive methods for multiphysics modeling. SIAM Conference on Mathematical and Computational Issues in the Geosciences, Stanford, California, USA, June 29 – July 2 2015.
I. Lunati, P. Tomin. A general framework for multiphysics modeling based on numerical averaging. AGU Fall Meeting, San Francisco, California, USA, 15–19 December 2014.
I. Lunati, P. Tomin, R. Künze. Multiscale methods as spatiotemporal grid-refinement techniques. 11th World Congress on Computational Mechanics, Barcelona, Spain, 20–25 July 2014.
P. Tomin, I. Lunati. Macroscopic description of two-phase flow in porous media based on the numerical averaging from pore scale. Computational Methods in Water Resources, Stuttgart, Germany, 10–13 June 2014.
P. Tomin, I. Lunati. Spatiotemporal-adaptive multiscale finite volume method. 6th International Conference on Porous Media & Annual Meeting, Milwaukee, Wisconsin, USA, May 27–30 2014.
P. Tomin, I. Lunati. Multiphysics methods: a link between pore-scale and Darcy-scale models. 11th Swiss Geoscience Meeting, Lausanne, Switzerland, 15–16 November 2013.
P. Tomin, I. Lunati. Numerical averaging from pore to Darcy scale for two-phase flow. 2nd NUPUS Conference, Bergen, Norway, 30 September – 2 October 2013.
P. Tomin, I. Lunati. Hybrid multiscale finite volume method for two-phase flow through porous media. SIAM Conference on Mathematical and Computational Issues in the Geosciences, Padua, Italy, 17–20 June 2013.
I. Lunati, P. Tomin. Multiscale finite volume method as a framework for physically motivated model reduction. SIAM Conference on Mathematical and Computational Issues in the Geosciences, Padua, Italy, 17–20 June 2013.
P. Tomin, I. Lunati. Hybrid modeling of multiphase flow in porous media: coupling Darcy and pore-scale description. AGU Fall Meeting, San Francisco, California, USA, 3–7 December 2012.
Lectures on “Multiscale Finite-Volume Formulations” within the course “Energy 224: Advanced Reservoir Simulation”, Stanford University
Lectures on “Introduction to Reservoir Simulation” within the course “Energy 246: Reservoir Characterization and Flow Modeling with Outcrop Data”, Stanford University
Lectures on “General Flow Equations” within the Summer Short Course: Fundamentals of Reservoir Simulation, Stanford University
Lecture on “Multiscale Simulation of Two-Phase Flow” within the course “Energy 289: Multiscale Methods for Transport in Porous Media”, Stanford University
Teaching Assistant for the course “Fluid transport in the subsurface” (Prof. Ivan Lunati), University of Lausanne
Ruslan Rin “Implicit Coupling Framework for Multi-Physics Reservoir Simulation”, Stanford University – PhD thesis co-adviser (Principal Adviser: Prof. Hamdi Tchelepi)
Rahman Shaik “Modelling of near-well acidization”, TU Delft – Master thesis co-adviser (Principal Adviser: Prof. Denis Voskov)
With Prof. Hadi Hajibeygi and Prof. Ivan Lunati: “Multiscale algorithms and their applications: from upscaling to scalable solvers and multiphysics modelling”, XXI International Conference Computational Methods in Water Resources, Toronto, Canada, June 2016
With Prof. Maša Prodanović and Prof. Ken Sorbie: “Advances in Pore-scale Modeling and Upscaling”, SIAM Conference on Mathematical and Computational Issues in Geosciences 2013, Padua, Italy, June 2013
Journal of Fluid Mechanics, Journal of Computational Physics, Computational Geosciences, Advances in Water Resources, Water Resources Research, Transport in Porous Media, Communications in Nonlinear Science and Numerical Simulation, Journal of Hydrologic Engineering, Applicable Analysis, Hydrogeology Journal, International Journal for Numerical Methods in Engineering, Geofluids, SPE Journal
C, C++, Matlab, Fortran, MPI, CVS, SVN, Hg, Git, GitHub, Bugnet, BugZilla, Linux, Latex, OpenFOAM, Enterprise Architect