Mohammadreza Sepahi, preferred name Perseus
Mechanical engineer with an M.Math in Applied Mathematics. I run turbulence simulations of the atmosphere and build engineering software.
Industry
May 2026 – present
Westport Fuel SystemsCambridge, Ontario
Contract role on the quality team, following my co-op term.
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Industry
May 2026 – present
Westport Fuel SystemsCambridge, Ontario
Contract role on the quality team, following my co-op term.
Industry
Sep 2025 – Apr 2026
Westport Fuel SystemsCambridge, Ontario
Testing, root-cause work, and the software the quality team now runs on.
Research
Sep 2023 – 2026
Fluid Mechanics Group, Department of Applied Mathematics, University of WaterlooWaterloo, Ontario
Large-eddy simulation of the stably stratified atmospheric boundary layer with WRF, replicating and extending Udina et al. (2016).
Research
Jul – Oct 2021
Hydrodynamics Laboratory (LadHyX), École Polytechnique, Institut Polytechnique de ParisPalaiseau, France
Flexible fibers sedimenting through obstacle arrays in a viscous fluid, with Camille Duprat and Blaise Delmotte.
Research
2019 – 2022
Amirkabir University of TechnologyTehran, Iran
Experimental and numerical study of fiber deformation in viscous flow.
Education
Sep 2023 – 2026
University of Waterloo, Fluid Mechanics GroupWaterloo, Ontario
Thesis: Stratification and Vertical Turbulence Structure in the Atmospheric Boundary Layer: A Large-Eddy Simulation Study (2026).
Education
2019 – Sep 2022
Amirkabir University of Technology (Tehran Polytechnic)Tehran, Iran
Thesis: Experimental and Numerical Study of Deformation of Fibers in a Viscous Fluid.
Education
Graduated Sep 2018
Kermanshah University of TechnologyKermanshah, Iran
Thesis: Calculating Stress Intensity Factor in Symmetric Crack of Perforated Plate with Inside Pressure.
Teaching
Spring 2024, Fall 2024, Spring 2025, Spring 2026
Faculty of Mathematics, University of WaterlooWaterloo, Ontario
Calculus tutorials across four terms.
Teaching
Winter 2024
Faculty of Mathematics, University of WaterlooWaterloo, Ontario
Head TA for the course.
Teaching
Fall 2023
Faculty of Mathematics, University of WaterlooWaterloo, Ontario
Two courses in my first term at Waterloo.
Master of Mathematics thesis, Department of Applied Mathematics, University of Waterloo
The stably stratified atmospheric boundary layer forms over land at night as the surface cools, and the buoyant suppression of turbulence makes it one of the hardest parts of the atmosphere to observe, simulate and parameterise. This thesis uses large-eddy simulation with the Advanced Research WRF model to study how the vertical structure and intensity of boundary-layer turbulence respond to increasing surface cooling, and how that response depends on mechanical forcing. Eight idealised simulations cross two geostrophic wind speeds (16.5 and 8.25 m/s) with four surface cooling rates (0, 0.25, 0.50 and 1.00 K/h). The strongly forced cases respond monotonically, consistent with the classical quasi-steady stable boundary layer. The weakly forced cases depart from that regime: the surface heat flux saturates near 10 W/m² despite a fourfold increase in imposed cooling, the surface friction velocity collapses, and the flow aloft decouples from the surface.
@mastersthesis{sepahi2026thesis,
title = {{Stratification and Vertical Turbulence Structure in the Atmospheric Boundary Layer: A Large-Eddy Simulation Study}},
author = {Perseus Sepahi},
year = {2026},
school = {University of Waterloo},
address = {Waterloo, Ontario, Canada},
url = {https://hdl.handle.net/10012/24382},
}Physical Review Fluids, 8(4), 044303
We study the sedimentation of flexible fibers through arrays of obstacles in a viscous fluid, combining experiments and numerical simulations. Obstacles induce lateral dispersion of the fibers and, depending on fiber flexibility and obstacle geometry, non-trivial trapping states.
@article{makanga2023obstacle,
title = {{Obstacle-induced lateral dispersion and nontrivial trapping of flexible fibers settling in a viscous fluid}},
author = {Ursy Makanga and Mohammadreza Sepahi and Camille Duprat and Blaise Delmotte},
year = {2023},
journal = {Physical Review Fluids},
volume = {8},
number = {4},
pages = {044303},
doi = {10.1103/PhysRevFluids.8.044303},
}SIAM Conference on Computational Science and Engineering (CSE23)
@inproceedings{makanga2023siam,
title = {{Sedimentation of Flexible Fibers in Structured Environments}},
author = {Ursy Makanga and Mohammadreza Sepahi and Camille Duprat and Blaise Delmotte},
year = {2023},
booktitle = {SIAM Conference on Computational Science and Engineering},
url = {https://hal.science/hal-04438332},
}75th Annual Meeting of the APS Division of Fluid Dynamics, Bulletin of the American Physical Society
@inproceedings{duprat2022apsdfd,
title = {{Sedimenting flexible fibers against obstacles in a viscous fluid}},
author = {Camille Duprat and Ursy Makanga and Mohammadreza Sepahi and Blaise Delmotte},
year = {2022},
booktitle = {Bulletin of the American Physical Society, 75th Annual Meeting of the Division of Fluid Dynamics},
url = {https://meetings.aps.org/Meeting/DFD22/Session/U26.10},
}Outside work: Gym, soccer, cycling, swimming, camping.