Gourabananda Pahar
Associate Professor
Department of Civil Engineering
Indian Institute of Technology Kanpur
Email: gpahar@iitk.ac.in, Phone: +91-512-259-2011
Study Domain
Solution of Shallow Water Equation (Left) and Diffusive Wave Equation (Right) with 2mm/hr rainfall pulses. Contour is given at the center.
Identical contours, parameters (Manning's n) and rainfall but drastically different results!
57600 cells and 40 minutes
12km X 12km, Sogam, Jammu and Kashmir, India
06km X 06km, Kanpur, Uttar Pradesh, India
Lead Developer: Naveed; Co-Developers: Ravi, Alok, Gourab
Simulation of idealized landslide induced waves. On the left hand there is granular column collapse, the corresponding waves generated in fluid are on the right. Granular column is simulated as Multilayered Depth-averaged Continuum with µ(I) rheology, whereas fluid is modelled using Incompressible Smoothed Particle Hydrodynamics (ISPH, at top) and Multilayered Shallow Water formulation (bottom). Colur represents velocity magnitude.
From top to bottom, the computational overhead decreases by 4! ...
Naveed Ul Hassan Bhat: Granular deformation coupled with fluid Flow: multilayered
depth-averaging, 2025.
M.Tech (Defended)
Ramanjaneyulu: Experimental Study of Landslide Generated Impulse Waves in a Confined Water Body, 2024.
Preethan M C: Method of characteristics: Applications to Conduits, Free-Surface, and Sub-Surface Flows, 2024.
Naveed Ul Hassan Bhat: Diffusion Wave Approximation of Depth-averaged Flow Interaction with Porous Media, 2022, (Awarded Best M.Tech Thesis 2022, Indian Society for Hydraulics).
Alok Kumar: A Unified Depth-Averaged Approach for Integrated Modeling of Surface and Subsurface Flow Systems, 2020, (Awarded Best M.Tech Thesis 2020, Indian Society for Hydraulics).
Parth Singh Rajkumar: An Implicit 2D Zero-Inertia Model for Overland Flow, 2020.
Engineering Hydrology: CE361A [2020-21 I, 20-21 III]
Advanced Hydraulics: CE611A [2018-19 I, 19-20 I]
Engineering Hydraulics: CE262A [2018-19 II, 19-20 II, 20-21 II, 21-22 II, 23-24 II]
Numerical Methods for Civil Engineers: CE604A [2019-20 I, 22-23 I]
Computational methods in Engineering: ESO208 [2023-24 I]
Urban flood inundation
Shallow water models
Incompressible Smoothed Particle Hydrodynamics
Shukla, R., Bhat, N., Kumar, A., Pahar, G., "An efficient and coupled 1D-2D hydrodynamic framework to model catchment scale surface flow dynamics" Journal of Hydrologic Engineering (accepted).
Bhat, N., Ieja, R., Pahar, G., "Wave generation due to partially and completely submerged column collapse" ISH Journal of Hydraulic Engineering (accepted).
Bhat, N., Pahar, G., 2025. "A novel two component multilayered depth-averaged model for coupling fluid-granular systems" International Journal of Multiphase Flow 191, 105321.
Kumar, A., Pahar, G., 2024. "Macroscopic modeling of urban flood inundation through Areal-averaged Shallow-Water-Equations" Advances in Water Resources 190, 104755.
Bhat, N., Pahar, G., 2024. "Coupled ISPH Framework for Modeling Tsunamis Induced by Landslides: Sub-aerial to Submerged " Journal of Hydraulic Engineering 150(3), 04024009.
Bhat, N., Pahar, G., 2024. "Layered Shallow water Equations: Spatiotemporally varying layer ratios with specific adaptation to wet/dry interfaces" International Journal for Numerical Methods in Fluids 96(4), 397-434.
Bhat, N., Pahar, G., 2023. "Granular media deformation and fluid flow as overlapping, concurrent, coupled multilayered depth-averaged framework" Ocean Engineering 283, 114957.
Kumar, A., Pahar, G., 2023. "On Applicability of Dynamic, Local, And Diffusive Wave Models for Unified Depth-Averaged Fluid Flow Interaction With Porous Media" Journal of Hydrologic Engineering 28 (10), 4023028 1-13.
Bhat, N., Pahar, G., 2022. "Depth-averaged coupling of submerged granular deformation with fluid flow: An augmented HLL scheme" Journal of Hydrology, 606, 127364.
Bhat, N., Pahar, G., 2021. "Euler-Lagrange framework for deformation of granular media coupled with the ambient fluid flow" Applied Ocean Research, 116, 102857.
Bhat, N., Pahar, G., 2021. "Diffusion Wave Approximation of Depth-averaged Flow Interaction with Porous Media" Journal of Hydrologic Engineering, 26(2), 04020064.
Kumar, A., Pahar, G., 2020. "A Unified Depth-averaged Approach for Integrated Modeling of Surface and Subsurface Flow Systems" Journal of Hydrology, 591, 125339.
Pahar, G., Dhar, A., 2019. "On Information Coupling in Hybrid ISPH Framework for Fluidized Granular Systems" Advances in Water Resources, 131, 103366.
Pahar, G., Dhar, A., 2018. "On Modelling of MPS-based Multiphase Fluid Flow with Low Density Ratios" International Journal of Numerical Methods in Fluids, 87(10), 529-542.
Pahar, G., Dhar, A., 2018. "On Force Consideration in Coupled ISPH Framework for Sediment Transport in Presence of Free-surface Flow" Environmental Fluid Mechanics, 18(3), 555-579.
Pahar, G., Dhar, A., Islam, M. R. I., 2017. "Extending Incompressible SPH Framework for Simulation of Axisymmetric Free-surface Flows" Engineering Analysis with Boundary Elements, 84C, 35-41.
Pahar, G., Dhar, A., 2017. "On Modification of Pressure Gradient Operator in Integrated ISPH for Multifluid and Porous Media Flow with Free-surface" Engineering Analysis with Boundary Elements, 80C, 38-48.
Pahar, G., Dhar, A., 2017. "Numerical Modelling of Free-surface Flow-Porous Media interaction using Divergence-free Moving Particle Semi-Implicit Method" Transport in Porous Media, 118(2), 157-175.
Pahar, G., Dhar, A., 2017. "Coupled incompressible Smoothed Particle Hydrodynamics model for continuum-based modelling sediment transport" Advances in Water Resources, 102, 84-98.
Pahar, G., Dhar, A., 2017. "Robust boundary treatment for open-channel flows in divergence-free incompressible SPH" Journal of Hydrology, 546, 464-475.
Pahar, G., Dhar, A., 2016. "Mixed miscible-immiscible fluid flow modelling with incompressible SPH framework" Engineering Analysis with Boundary Elements, 73, 50-60.
Pahar, G., Dhar, A., 2016. "A Robust volume conservative divergence-free ISPH framework for free-surface flow problems" Advances in Water Resources, 96, 423-437.
Pahar, G., Dhar, A., 2016. "Modeling free-surface flow in porous media with modified incompressible SPH" Engineering Analysis with Boundary Elements, 68, 75-85.
Pahar, G., Dhar, A., 2014. "A dry zone-wet zone based modeling of surface water and groundwater interaction for generalized ground profile" Journal of Hydrology, 519 (Part B), 2215-2223.
Professional Experience
Faculty, Indian Institute of Technology Kanpur [Jan’18-]
Project Officer, Indian Institute of Technology Kharagpur [Aug’17-Dec’17]
Education
Doctor of Philosophy, Civil Engineering, Indian Institute of Technology Kharagpur [Jul’13-Sep’17], Advisor: Dr. Anirban Dhar
Master of Technology, Hydraulic and Water Resources Engineering, Indian Institute of Technology Kharagpur [Jul’11-Jun'13], Advisor: Dr. Anirban Dhar
Bachelor of Engineering, Civil Engineering, Bengal Engineering and Science University, Shibpur [Jul’07-Jun'11].
