A5036204559- Coastal and Marine Dynamics
- Fluid Dynamics Simulations and Interactions
- Wave and Wind Energy Systems
- Ocean Waves and Remote Sensing
- Tropical and Extratropical Cyclones Research
- Fluid Dynamics and Vibration Analysis
- Computational Fluid Dynamics and Aerodynamics
- Fluid Dynamics and Turbulent Flows
- Fluid Dynamics and Heat Transfer
- Earthquake and Tsunami Effects
- Lattice Boltzmann Simulation Studies
- Aerodynamics and Acoustics in Jet Flows
- Aeolian processes and effects
- Geotechnical Engineering and Underground Structures
- Ship Hydrodynamics and Maneuverability
- Advanced Fiber Optic Sensors
- Combustion and flame dynamics
- Marine and Offshore Engineering Studies
- Computational Physics and Python Applications
- Coastal wetland ecosystem dynamics
- Evacuation and Crowd Dynamics
- Heat Transfer Mechanisms
- earthquake and tectonic studies
- Computer Graphics and Visualization Techniques
- Wind and Air Flow Studies
Indian Institute of Technology Madras
2021-2024
Sardar Vallabhbhai National Institute of Technology Surat
2014-2021
Direct numerical simulation of transitional and turbulent round jets is reported in a comparative framework. Such comparison central toward revealing the roles that molecular viscosity vorticity intensification play evolution jets. The initial intermediate differentiated based on assessment starting jet, roll-up frequency, dynamics vortex rings, emergence secondary instability. Long-term behavior preferred mode time averaged vortical structures, half jet-width, volume flow rate obtained from...
Youngs' piecewise line interface construction/volume-of-fluid (PLIC-VOF) technique is an accurate tool for representation and intrinsic volume conservation multiphase simulations. Direction splitting of the algorithm ensures stable performance up to Courant numbers unity. However, baseline PLIC algorithms face open problem conservative advection in shearing velocity fields. Rather than modifying equation (Youngs PLIC-VOF) achieve a limited range solenoidal fields, coupling with...
Understanding the dynamics of wave energy converters and vortical structure breaking waves are challenging hydrodynamic problems relevant to coastal engineering. These issues can be addressed at laboratory scale through a specialized class devices known as experimental flumes numerical tanks (NWTs). This paper presents process design development NWT flume that would eventually applied for analyzing hydrodynamics waves. The characteristics simulated have been selected from literature based on...
This paper presents the comparative study carried out for focused waves interaction with fixed cylinder in ISOPE 2020.The discusses qualitative and quantitative comparison between 20 different numerical solvers from various universities across world a cylinder.The moving cases are reported companion as Part B. The presented this recent state of art field, mostly developed in-house by academic institutes.Majority participants used hybrid modeling, i.e. combination potential flow Navier-Stokes...
A high-resolution, Navier–Stokes solver is developed for direct numerical simulation (DNS) of free shear flow. All terms in equations are discretized using higher order methods. Diffusion term fourth central difference scheme while second Adams–Bashforth used time derivative. Advecting velocity approximated Lagrangian interpolation. For the approximation advected velocity, a blended fifth order-upwind proposed. Developed high resolution DNS round jet transitional and turbulent regimes. novel...
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Direct numerical simulation of a turbulent round jet subjected to varicose excitation has been carried out. The effect domain size and waveform used for providing have studied with the help time-averaged mean, fluctuating quantities, instantaneous isosurfaces Q-criterion. Initial evolution suggests that secondary instability is delayed in time an increase irrespective waveform. It also observed manifests stronger square wave based as compared sinusoidal smaller medium domains. In addition,...
Failure of structures during extreme coastal flood events like a tsunami is common due to inadequate structural design, resulting in substantial material loss. Nevertheless, improvements the design could reduce global failure. Although many studies developed force equations for non-overtopping structures, critical and non-critical still exist along coastlines with low heights. In this study, we investigate effect flow overtopping case low-rise typically representing residential building,...
Two-phase Reynolds Averaged Navier-Stokes (RANS) simulations of breaking waves are susceptible to an unphysical thickening the plunging crest. This is often times incorrectly attributed deficiencies in interface capturing scheme although, reality, issue stems from nature density treatment momentum advection. If considered face-centered advection term, resulting formulation conservative whilst if modeled as a cell-centered quantity, non-conservative. Despite both approaches having been...
Abstract Moonpools are designed to provide a calm environment for lowering of equipment from ships. Considerable research effort has been invested towards understanding water column excitation within moonpool. However, most recent investigations consider regular waves. The nature interaction between focused waves and moonpool is not well-understood; the present work strives fill this gap. A series experiments have carried out in 22 m long glass flume Department Ocean Engineering at IIT...
Development of mass-source function based numerical wave tank (NWT) algorithms in the Navier-Stokes (NSE) framework is impeded by multiple design issues such as: (a) optimization a number variables characterizing source region, (b) wave-vorticity interactions and (c) mandatory requirement modeling domain on both sides wavemaker. In this paper, we circumvent these hurdles proposing volume-preserving inflow-boundary tank. Wave generation propagation modeled two-phase PLIC-VOF set-up....
<p>The feasibility of generating long period waves using a piston-type wavemaker was comprehensively demonstrated in [1] for the Großer Wellenkanal (GWK) at 1:100 scale. These included regular waves, elongated solitons, N-waves as well time-series pertaining to earthquake tsunamis (namely 2004 Indian Ocean and 2011 Tohoku tsunamis).</p><p>In companion paper [2], aforementioned long-period were simulated fully nonlinear potential theory...