Xin Liu

Physics Scientist, Research

Hydraulic Modelling, Numerical Prediction of Water System, Development of Numerical Models, River Modelling, Maintaining Numerical Simulation Suites

Environment and Climate Change Canada

Current research and/or projects

Research and Development on Numerical Forecast in the Great Lakes St. Lawrence River Watershed.

Research and/or project statements

My research interests span the areas of hydrodynamic, morphodynamic and environmental/chemical fluid mechanics. A common thread in my research is in understanding the theory, design of numerical algorithms and models, and performing numerical simulations and analyses. To numerically solve the engineering and mechanical problems, I have resorted to mathematical methods from the areas of solving partial differential equations(PDEs) and ordinary differential equations(ODEs), geometry and statistics.

I'm particularly interested in the following research topics:

Computational hydraulics
Ocean/River/Atmosphere modelling
Sediment Transport and Morphodynamic Modelling
Numerical methods for partial/ordinary differential equations

Professional activities / interests

Adjunct Professor, Department of Civil Engineering, University of Ottawa

Education and awards

Education:

Ph.D.   Environmental Engineering, University of Ottawa, Canada        2011-2016
M.S.    Chemical Engineering, Hebei University of Technology, China   2008-2011
B.S.     Chemical Engineering, Hebei University of Technology, China   2004-2008

Awards:

SUSTech President Award for Excellent Postdoctoral Fellow: 2018-2019
Natural Resources Canada's STIP Fellowship: 2016-2017
Nomination of Pierre Laberge Prize, Uottawa: 2016
University of Ottawa Graduate Dean's Scholarship: 2016
Ontario Graduate Scholarship: 2015-2016
Queen Elizabeth II Graduate Scholarships in Science and Technology: 2014-2015
Queen Elizabeth II Graduate Scholarships in Science and Technology: 2012-2013
University of Ottawa Excellence Scholarship/Admission Scholarship: 2011-2016

International experience and/or work

Physics Scientist, Researh: Numerical Environmental Prediction Section, Environmental and Climate Change Canada/Government of Canada, Dorval, Quebec, Canada 2019.08-present

Postdoctoral Fellow: Department of Mathematics, Southern University of Science and Technology, Shenzhen, China 2017.10-2019.07

Visiting Scholar: Department of Mathematics, Southern University of Science and Technology, Shenzhen, China 2017.07-2017.09

Intern: Department of Civil Engineering, University of Ottawa, Ottawa, Canada 2016.09-2017.05

Key publications

[34] X. Liu, J. He. "A novel well-balanced numerical model for water-solute mixture underflows coupled with ambient water." Submitted.

[33] X. Liu. "A three-stage third-order low-dissipation and low-dispersion explicit exponential Runge-Kutta Method." Submitted.

[32] X. Liu. "New Well-balanced Path-Conservative Numerical Scheme for A Partially-Relaxed Two-Layer Hydro-Sediment-Morphodynamic Model." To appear in Journal of Hydraulic Engineering.

[31] X. Liu, S. Chen. "Improved modelling of flows in sewer pipes with a novel well-balanced MUSCL scheme." Journal of Hydraulic Engineering 148, 12(2022).

[30] A. Chertock, A. Kurganov, X. Liu, Y. Liu, T. Wu. "Well-Balancing Via Flux Globalization: Applications to Shallow Water Equations with Wet/Dry Fronts." Journal of Scientific Computing 90, 9(2022).

[29] X. Liu. "A New Well-Balanced Finite Volume Scheme on Unstructured Grids for Two-dimensional Two-layer Shallow Water System." Journal of Computational Physics, 438(2021)

[28] X. Liu, J. He. "A well-balanced numerical model for depth-averaged two-layer shallow water flows." Computational and Applied Mathematics, 40, 311(2021).

[27] S. Chen, F. Zheng, X. Liu. "Augmented HLL Riemann solver including slope source term for 1D mixed pipe flows." Journal of Hydroinformatics, 23 (4) (2021): 831–848.

[26] S. Chen, F. Zheng, X. Liu, P. Garamb. "Pressure-balanced Saint-Venant equations for improved asymptotic modelling of pipe flow." Journal of Hydro-environment Research, 37(2021): 46-56.

[25] X. Liu, S. Chen. "Discussion of 'A remark on finite volume methods for 2D shallow waterequations over irregular bottom topography' by Cristo et al., Journal of Hydraulic Research(2020):1-8." Journal of Hydraulic Research, 59(2021): 1036-1037.

[24] X. Liu. "A Well-balanced and Positivity-preserving Numerical Model for Shallow Water Flows in Channels with Wet-dry Fronts." Journal of Scientific Computing, 85 60(2020).

[23] X. Liu. "A Steady-State-Preserving Scheme for Shallow Water Flows in Channels." Journal of Computational Physics , 423C(2020): 109803.

[22] X. Liu. "A Well-Balanced Asymptotic Preserving Scheme for the Two-Dimensional Shallow Water Equations over Irregular Bottom Topography." SIAM Journal on Scientific Computing, 42(5)(2020): B1136–B1172.

[21] X. Liu, X. Chen, S. Jin, A. Kurganov, T. Wu, H. Yu. "Moving-Water Equilibria Preserving Partial Relaxation Scheme for the Saint-Venant System." SIAM Journal on Scientific Computing, 42(4), (2020): A2206-A2229

[20] X. Liu, A. Chertock, A. Kurganov, K. Wolfkill. "One-Dimensional/Two-Dimensional Coupling Approach with Quadrilateral Confluence Region for Modeling River Systems." Journal of Scientific Computing, (2019): 1-32.

[19] X. Liu, A. Chertock, A. Kurganov. "An Asymptotic Preserving Scheme for Two Dimensional Shallow Water Equations with Coriolis Force." Journal of Computational Physics, 391(2019): 259-274.

[18] X. Liu. "A Robust Numerical Model for Solute Transport in the Shallow Water System with Wet/Dry Interfaces." Computer Methods in Applied Mechanics and Engineering, 351(2019): 85-108.

[17] X. Liu. "A Highly Efficient Numerical Method for Rotating Oceanographic Flows Modeled by Saint-Venant System with Coriolis Forces" Communications in Computational Physics, 25 (2019): 1394-1412.

[16] X. Liu, J. Albright, Y. Epshteyn, A. Kurganov. "Well-Balanced Positivity Preserving Central-Upwind Scheme with a Novel Wet/Dry Reconstruction on Triangular Grids for the Saint-Venant System." Journal of Computational Physics, 374 (2018): 213-236.

[15] X. Liu, J. A. Infante Sedano, A. Mohammadian. "Closure to 'A coupled two-dimensional numerical model for rapidly varying flow, sediment transport and bed morphology' by XIN LIU, JULIO ANGEL INFANTE SEDANO and ABDOLMAJID MOHAMMADIAN, J. Hydraulic Res. 53(5), 2015, 609-621." Journal of Hydraulic Research, 56(5), (2018): 751-752.

[14] X. Liu, A. Beljadid. "A coupled numerical model for water flow, sediment transport and bed erosion." Computers & Fluids, 154 (2017): 273-284.

[13] X. Liu, A. Mohammadian, J. A. Infante Sedano. "A numerical model for three-dimensional shallow water flows with sharp gradients over mobile topography." Computers & Fluids, 154C (2017): 1-11.

[12] X. Liu, A. Mohammadian, J. A. Infante Sedano. "Numerical modelling of submarine turbidity currents over erodible beds using unstructured grids." Ocean Modelling, 113(2017): 157-170.

[11] X. Liu, A. Mohammadian, J. A. Infante Sedano, and Alexander Kurganov. "Three-dimensional shallow water system: A relaxation approach." Journal of Computational Physics, 333 (2017): 160-179.

[10] X. Liu, A. Mohammadian, J. A. Infante Sedano. "Numerical modeling of mixing downstream of a mass slug injection using exponential Runge-Kutta integrator." International Symposium on Outfall Systems, (2016), Ottawa, Canada.

[09] X. Liu, A. Mohammadian, J. A. Infante Sedano. "Three-dimensional modeling of non-hydrostatic free-surface flows on unstructured grids." International Journal for Numerical Methods in Fluids, 82, no.3 (2016):130-147.

[08] X. Liu, A. Mohammadian, A. Kurganov, J. A. Infante Sedano. "Well-balanced central-upwind scheme for a fully coupled shallow water system modeling flows over erodible bed." Journal of Computational Physics, 300 (2015): 202-218.

[07] X. Liu, J. A. Infante Sedano, A. Mohammadian."A coupled two-dimensional numerical model for rapidly varying flow, sediment transport and bed morphology." Journal of Hydraulic Research, 53, no. 5 (2015): 609-621.

[06] X. Liu, J. A. Infante Sedano, A. Mohammadian. "A robust coupled 2-D model for rapidly varying flows over erodible bed using central-upwind method with wetting and drying." Canadian Journal of Civil Engineering, 42, no.8 (2015): 530-543.

[05] X. Liu, A. Mohammadian, J. A. Infante Sedano. "A Well-Balanced 2-D Model for Dam-Break Flow with Wetting and Drying." Journal of Fluid Flow, Heat and Mass Transfer, 1(2014): 30-37.

[04] X. Liu, A. Mohammadian, J. A. Infante Sedano. "One Dimensional Numerical Simulation of Bed Changes in Irrigation Channels using Finite Volume Method." Irrigation & Drainage Systems Engineering, 1, no.103 (2012): 2.

[03] W. Chen, X. Liu, X. Fan, L. Chu, Y. Yang, W. Liu. "Three-dimensional simulation of gas-solid flow in the biomass circulating fluidized bed gasifier's riser." Advanced Materials Research, 383-390 (2012): 6537-6542.

[02] X. Liu, W. Chen, X. Fan, J. Sun, S. Pang. "Various Circulating Fluidized Beds Biomass Gasifers." Boiler Technology, 43, no.1 (2012): 33-37.

[01] X. Liu, W. Chen, X. Fan, J. Sun. "3-D Numerical Simulation of Flow Structure in Miniature Biomass Circulating Fluidized Beds Gasi er." Transactions of the Chinese Society of Agricultural Machinery, 42, no.6 (2011): 112-116.