Shagun Agarwal

Shagun Agarwal

Numerical modelling in Ocean and Coastal Engineering.

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publications

Demonstration of control and inspection by circumferentially guided ultrasonic waves using novel Remotely Operated Underwater Vehicle

Published in ISSS Journal of Micro and Smart Systems, 2018

Scientific contribution: Design and performance of remotely operation underwater vehicle for non-destructive testing of submerged pipes. Presents mechanical, electrical & sensor design. Shows path control performance.

Recommended citation: Agarwal, S., Jhunjhunwala, T., Saikiran, N., Rajagopal, P. (2018) Demonstration of control and inspection by circumferentially guided ultrasonic waves using novel Remotely Operated Underwater Vehicle. ISSS Journal of Micro and Smart Systems 7, 97-105.
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Interaction of Fixed Cylinder With Waves Through Weakly Coupled FNPT and Lagrangian Navier-Stokes

Published in OMAE 2019, Glasgow, Scotland, UK., 2019

Recommended citation: Agarwal, S., Sriram, V., Murali, K., 2019. Interaction of Fixed Cylinder With Waves Through Weakly Coupled FNPT and Lagrangian Navier-Stokes, in: Proceedings of the ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. Volume 7A: Ocean Engineering. American Society of Mechanical Engineers, Glasgow, Scotland, UK.
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A Comparative Study on the Nonlinear Interaction Between a Focusing Wave and Cylinder Using State-of-the-art Solvers: Part A

Published in International Journal of Offshore and Polar Engineering, 2021

Scientific contribution: Comparative study of focusing wave interaction with fixed monopile. Peak and phase error quantification and reliability analysis for 20 numerical models. Wide range of numerical models.
My contribution: Postprocessing of all experiment and numerical data. Prepared all graphs. Co-authored the discussion and conclusions. Co-organised the comparative study.

Recommended citation: Sriram, V., Agarwal, S., Yan, S., Xie, Z., et al. (2021) A Comparative Study on the Nonlinear Interaction Between a Focusing Wave and Cylinder Using State-of-the-art Solvers: Part A. International Journal of Offshore and Polar Engineering 31, 1–10.
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A Comparative Study on the Nonlinear Interaction Between a Focusing Wave and Cylinder Using State-of-the-art Solvers: Part B

Published in International Journal of Offshore and Polar Engineering, 2021

Scientific contribution: Comparative study of focusing wave interaction with moving monopile. Peak and phase error quantification and reliability analysis for 5 numerical models.
My contribution: Postprocessing of all experiment and numerical data. Prepared all graphs. Co-authored the discussion and conclusions. Co-organised the comparative study.

Recommended citation: Agarwal, S., Saincher, S., Sriram, V., Yan, S., et al. (2021) A Comparative Study on the Nonlinear Interaction Between a Focusing Wave and Cylinder Using State-of-the-art Solvers: Part B. International Journal of Offshore and Polar Engineering 31, 11–18.
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Laboratory Study on Steep Wave Interactions with Fixed and Moving Cylinder

Published in International Journal of Offshore and Polar Engineering, 2021

Scientific contribution: New set of experiments on focusing wave interaction with fixed and moving monopile. Wave generated using second order wave-maker theory. Reports dynamic pressure across the monopile.
My contribution: Postprocessing of experiment data. Prepared all graphs. Co-authored discussion, conclusions.

Recommended citation: Sriram, V., Agarwal, S., Schlurmann, T. (2021) Laboratory Study on Steep Wave Interactions with Fixed and Moving Cylinder. International Journal of Offshore and Polar Engineering 31, 19–26.
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Improvements in MLPG formulation for 3D wave interaction with fixed structures

Published in Computers and Fluids, 2021

Scientific contribution: 3D meshless local Petrov-Galerkin methods for viscous free-surface flow. Presents algorithms for semi-analytical local domain integration, 3D free-surface particle identification, moving side- wall and particle redistribution techniques. Validated with experiments on focusing wave impact on monopile.

Recommended citation: Agarwal, S., Sriram, V., Yan, S., Murali, K. (2021) Improvements in MLPG formulation for 3D wave interaction with fixed structures. Computers & Fluids 218, 104826.
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Experimental investigation of hydrodynamic loading induced by regular, steep non-breaking and breaking focused waves on a fixed and moving cylinder

Published in European Journal of Mechanics - B/Fluids, 2022

Scientific contribution: Experiment based study of linear superposition of focusing waves and current loads on monopile. Investigation of breaking impact. Comparison against fully-nonlinear potential flow simulations.
My contribution: Simulations of focusing wave interaction with monopile. Postprocessing and graphs of time-series and time-frequency spectra

Recommended citation: Saincher, S., Sriram, V., Agarwal, S., Schlurmann, T. (2022) Experimental investigation of hydrodynamic loading induced by regular, steep non-breaking and breaking focused waves on fixed and moving cylinder. European Journal of Mechanics - B/Fluids 93, 42–64.
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Waves in waterways generated by moving pressure field in Boussinesq equations using unstructured finite element model

Published in Ocean Engineering, 2022

Scientific Impact: Unstructured FEM with mixed formulation for simulating ocean wave propagation and transformation in km2 ocean-surface domains. Added capability to simulate ship-generated waves. Presents numerical investigation of accuracy and stability. Validation against field study on 30 km2 ocean-surface.

Recommended citation: Agarwal, S., Sriram, V., Liu, P. L.-F., Murali, K. (2022) Waves in waterways generated by moving pressure field in Boussinesq equations using unstructured finite element model. Ocean Engineering 262, 12202.
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Three-dimensional coupling between Boussinesq (FEM) and Navier-Stokes (particle based) models for wave structure interaction

Published in Ocean Engineering, 2022

Scientific Impact: Enables real scale ocean wave-structure interaction simulations using particle-based methods. First hybrid model presenting 3D coupling between mesh-based potential and particle-based viscous free-surface flow models. Numerical investigation of fluid-fluid coupling. Validation against experiments.

Recommended citation: Agarwal, S., Sriram, V., Murali, K. (2022) Three-dimensional coupling between Boussinesq (FEM) and Navier-Stokes (particle based) models for wave structure interaction. Ocean Engineering 263, 112426
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Dynamic analysis of viscoelastic floating membranes using monolithic Finite Element method

Published in Journal of Fluids and Structures, 2024

Scientific Impact: A finite element model that couples floating membrane dynamics with surrounding free-surface and fluid in a unified formulation. Solution in time and freqency domain. It computes wet modes and shows full wave transmission at wet natural frequencies, revealing how these can be harnessed to maximize wave energy absorption / dissipation in floating membrane systems.

Recommended citation: Agarwal, S., Colomés, O., Metrikine, A.V., 2024. Dynamic analysis of viscoelastic floating membranes using monolithic Finite Element method. Journal of Fluids and Structures 129, 104167.
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Experimental and Numerical Modeling of Flexible Synthetic Mooring Lines for Floating Structures

Published in ISOPE 2025, Goyang, South Korea, 2025

Recommended citation: Colomés, O., Tang, J., Sakthivel, S., Agarwal, S., Jonathan, K., Gómez, S.S., 2025. Experimental and Numerical Modeling of Flexible Synthetic Mooring Lines for Floating Structures, in: The 35th International Ocean and Polar Engineering Conference, International Ocean and Polar Engineering Conference. Presented at the ISOPE 2025, Goyang, South Korea, p. ISOPE-I-25-246.
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Optimization of Viscoelastic Floating Membranes for Maximum Power Absorption Through Adjoint-Based Pde-Constrained Optimization (Under Review)

Published in , 2025

Scientific Impact: Insights into the properties such as mass, pre-tension and material damping of viscoelastic floating membranes, optimised for absorbing / dissipating the maximum wave energy through hydro-visco-elastic response.
My contribution: Developed the underlying FEM model. Guided the systematic analysis of the optimisation problem.

Recommended citation: El Sayed, K., Agarwal, S. & Colomés, O. Optimization of Viscoelastic Floating Membranes for Maximum Power Absorption Through Adjoint-Based Pde-Constrained Optimization. Available at SSRN. (under review)
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Finite-element model for geometric nonlinearity and dynamic stiffness of synthetic mooring lines

Published in ISOPE 2025, Goyang, South Korea, 2025

Recommended citation: Agarwal, S., Colome’s, O., 2025. Finite-Element Model for Geometric Nonlinearity and Dynamic Stiffness of Synthetic Mooring Lines, in: The 35th International Ocean and Polar Engineering Conference, International Ocean and Polar Engineering Conference. Presented at the ISOPE 2025, Goyang, South Korea, p. ISOPE-I-25-245.
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Gaussian Copula-Based Bayesian Networks for Dynamic Loads in Mooring Systems (Under Review)

Published in , 2025

Scientific Impact: A statistical method for linking the snap loads in catenary line with the incoming sea-state.
My contribution: Developed the underlying geometrically nonlinear mooring line model. Conducted simulations of catenary lines at 10 water-depths with 300 irregular sea-states each.

Recommended citation: Santjer, R., Agarwal, S., Colomés, O., Morales-Napoles, O. Gaussian Copula-Based Bayesian Networks for Dynamic Loads in Mooring Systems. Available at SSRN. (under review)
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Structural Analysis and Power Losses in Floating Solar Platform in Offshore Environment (Under Review)

Published in , 2025

Scientific Impact: First hybrid study of floating photovoltaic (FPV) platforms incorporating the platforms hydro-visco-elastic response and the optoelectrical consequenses. Real data on sea-state and irradiance.
My contribution: Developed the underlying hydro-visco-elastic model. Simulated response of FPV platform for irregular sea-state over 1 year, with spectrum updated every hour. Analysed the influence of the number of pontoons, their mass, thickness and bending stiffness on the FPV’s floating body response and loads.

Recommended citation: Alcañiz, A., Agarwal, S., Tiwald, P., Isabella, O., Ziar, H., Colomés, O. Structural Analysis and Power Losses in Floating Solar Platform in Offshore Environment. Available at SSRN. (under review)
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Dynamic Finite-Strain Analysis of Mooring Lines Based on Tangential Differential Calculus (Under Review)

Published in , 2025

Scientific Impact: FEM model for catenary and taut mooring lines. Conducive to the geometric nonlinearity arising from the shape of the line, and also the large deformation of the line. Explores hardening behaviour of taut lines. Additionally, introduces low-fidely semi-analytical equivalents for taut lines for conceptual design and optimisation.

Recommended citation: Agarwal, S., Gómez, Sergio Sánchez & Colomés, Oriol. Dynamic Finite-Strain Analysis of Mooring Lines Based on Tangential Differential Calculus. Available at SSRN. (under review)
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FEBOUSS

FEM model for weakly nonlinear wave-propagation equations in intermediate and shallow water depth.

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