Options
K Murali
Loading...
Preferred name
K Murali
Official Name
K Murali
Alternative Name
Murali, Kantharaj
Kantharaj, M.
Kantharaj, Murali
Murali, K.
Main Affiliation
Email
ORCID
Scopus Author ID
Google Scholar ID
122 results
Now showing 1 - 10 of 122
- PublicationPerformance of cage floating breakwater(01-01-1997)
; Mani, J. S.Conventional floating breakwaters are examined and the feasibility of developing a cage floating breakwater is explored. Earlier studies on floating breakwaters reveal that, to achieve a transmission coefficient (Kt) less than 0.5, the breakwater width to wave length ratio (W/L) should necessarily be greater than 0.4 for most of the configurations. Recent studies on cost-effective floating breakwaters indicate that by fixing a row of pipes below the floating body, the W/L requirement can be reduced to 0.15 without any compromise in the performance. This concept has been adopted in developing a new configuration to serve as: (1) a floating breakwater; and (2) as a possible shallow water cage culture unit. Experiments were conducted to study the performance of the cage floating breakwater under wave and wave-current environment. The results on transmission and reflection coefficients are presented and compared with those reported in the literature. The variation of water surface oscillations and velocities within the cage, the effect of mooring line stiffness, and initial tension on transmission characteristics are also discussed. - PublicationImpact of coastal structure on shorelines along the southeast and southwest coasts of india(01-01-2022)
; ; ; Singaravelu, VasanthakumarThis study aims to explore the site-specific impact of coastal structures on the stability of the shoreline. For this study, the shoreline data were collected with higher-order accuracy along a few vulnerable stretches of the coast in the vicinity of hard structures such as Seawalls, Groyne, Breakwater, and Training walls along the southeast and southwest coasts of India. All the field collected shoreline data were analysed with statistical measures using DSAS (Digital Shoreline Analysis System) tool of ArcGIS software. The presence of shore connected coastal structures dictates the sedimentation process in its purlieu. The observed average rate of erosion and accretion in the adjoining coastlines are −5.7 m/yr and +4.92 m/yr, respectively. The field measurements from the present study would provide an effective base for the planning and implementation of coastal structures near the studied area, as well as to adopt a better methodology for coastal impact assessment. Most of the well-planned and executed hard engineering structures have yielded desirable results and benefit for the local coastal communities. - PublicationEffects of tubercles on blade and wake of hamct in post stall regimes: Linear cascade study(01-01-2019)
;Dondapati, Varun RajThe aim of the current work is to find out the effects of tubercles on the blade and wake of the turbine, which could be used in situations, where interaction among the array turbines is inevitable. Steady simulations are performed on a linear cascade setup of modified and unmodified infinite span NACA 63421 section blade, at Reynolds numbers 5×105 and 106 at inboard (low radial location) spacing. The tubercles used are at the scale of the boundary layer. The study showed that the boundary layer scale tubercles are advantageous only at higher Re and deeper stall regimes. - PublicationCoastal and Marine Data Information System for Maritime Spatial Planning(01-01-2023)
; ; This chapter describes a coastal and marine data information system that can be used for Maritime Spatial Planning. The system takes advantage of Internet mapping and web services technology to publish data as maps. These maps are created dynamically and enable the visualization of a diverse and growing collection of environmental data. Capabilities of the system include (i) visualization of environmental parameters on 2D maps; (ii) visualization of location-specific depth profiles of selected parameters; (iii) time animation of grids of environmental parameters and (iv) preparation of digital elevation and cultural object data sets for 3D terrain visualization (Durairaju et al., 2003, 2010). The function and interaction between key components of the system are described to illustrate the working of the system. The use of a mature map publishing engine greatly eased the development of these capabilities into a web-based system. - PublicationPrediction of shoreline behaviour for Madras, India - A numerical approach(01-01-1997)
;Mani, J. S.; Chitra, K.A satellite port has been proposed about 14.8km north of Madras port on the east coast of India. As the interference of a satellite port with the existing pattern of longshore sediment transport will generate coastal imbalance in the region, a numerical model study involving sediment transport and combined wave refraction-diffraction was conducted to predict the shoreline behaviour. A realistic approach to the study was made to meet the objectives by considering wave height-wave period distributions in the region and duration and sequence of their occurrence during major monsoon seasons. This method of analysis enabled us to predict: (i) the extent of general shoreline advancement, particularly in front of a tidal inlet - a source of the cooling water requirement for an existing thermal power plant; (ii) the extent of the coastal region that will be affected owing to recession of shoreline and its impact on: (a) the fishing community living along the coastal stretch; (b) the national highway running along the coast; and (c) the changes in nearshore bathymetry. Based on the studies, management plans were drawn to safeguard the coastal region from imbalances that will arise out of construction of the satellite port. This paper highlights the effects of a satellite port on the coastal region and the need for proper management. © 1997 Elsevier Science Ltd. - PublicationThree-dimensional coupling between Boussinesq (FEM) and Navier–Stokes (particle based) models for wave structure interaction(01-11-2022)
;Agarwal, Shagun; The paper presents coupling between a mesh-based finite-element model for Boussinesq equations (FEBOUSS Agarwal et al., 2022) with a meshless local Petrov–Galerkin model for the Navier–Stokes equations (MLPG_R Agarwal et al., 2021) in 3D. Boussinesq equation models are widely used for simulating wave-propagation over large domains with uneven topography using a 2D surface mesh. Mesh-less models inherently capture large free-surface deformations and have shown promise in simulating wave-structure interaction, run-up and breaking phenomenon. The hybrid approach in this paper assumes a 3D MLPG_R sub-domain surrounded by the 2D mesh of FEBOUSS. The coupling interface in MLPG_R consists of relaxation zones that can be placed along multiple boundaries of the sub-domain for exchanging particle velocity from FEBOUSS. This hybrid model is therefore capable of simulating directional waves, that has not been reported previously. The paper first presents the procedure for calculating the depth-resolved velocities in 3D from the Boussinesq model. The resultant velocities are compared against theory, experiments and other models. The following sections present the coupling algorithm along a single and multiple coupling interfaces in MLPG_R. Validation results for this hybrid model are provided using surface elevation and velocity measurements for regular waves, including directional cases. In general, the results from the hybrid model are reported to have marginal over-prediction of peaks compared to purely MLPG_R simulation. Finally, the interaction of a vertical cylinder with direction regular wave is simulated using the 3D hybrid model. - PublicationVery severe cyclonic storm impacts to shoreline and beach profiles along the Karaikal coast of India(01-01-2022)
;Jeyagopal, Sriganesh ;Singaravelu, Vasanthakumar ;Dhananjayan, Mikkilineni; ; Shorelines experience significant changes near a coastal structure and around the confluence of a river and the sea. Field investigation and site data collection by the latest technologies for the detailed data collection would pave the way for the interpretation of the morphological changes close to the real scenario, which is essential for an efficient and sustainable coastal protection planning and coastal zone management. This paper deals with shoreline on either side of the mouth of the Arasalar River draining into the Bay of Bengal with a year-long (March 2018 to February 2019) continuous shoreline assessment during which GAJA cyclone made its landfall on 16 November 2018 along the Karaikal coast of Union Territory of Puducherry located on the southeast coast of India. A pair of training walls effectively keeps the mouth from silting, thereby allowing free passage of vessels. This study aims to understand the seasonal variation coupled with the severe cyclonic impact on the southeast coast of India. Monthly spring shoreline and cross-shore profiles during low tide and high tide were collected, including post-cyclone field data. The results discuss the erosion and accretion pattern of the sediment processes adjacent to the training walls and cyclone effects. - PublicationWave runup on a concentric perforated circular cylinder system(24-03-2006)
;Vijayalakshmi, K. ;Neelamani, S.; The regular wave interaction with a double concentric porous circular cylinder system consisting of an inner impermeable cylinder and an outer perforated cylinder was studied through physical model study. The experiments were carried out on the the double cylinder model in a wave flume to study the runup and rundown at the leading and trailing edges of the perforated cylinder. It was found that the maximum wave runup on the perforated cylinder is almost the same as the incident wave height. The predictive formulae were also developed for the wave runup and rundown on the perforated cylinder, which can be easily used for design applications. - PublicationExperimental investigation of wave runup on offshore intake wells in a random wave environment(01-01-2019)
;Kumar, V. Prabu; The seawater intake system is one of the essential operational units in many industries located in the coastal regions. The selection of the type of intake system to a specific sector depends on the total volume required and the quality of the sea water. The offshore seawater intake wells are a suitable option to meet the large volume water requirement and desired water quality. Sometimes two or more intake wells are installed to supply the large volume of the sea water. Since the increase in spacing between the wells leads to an increase in capital cost, it is predominant important to find the optimum distance between the wells. The present study focuses on the external and internal hydrodynamics of two caisson type offshore intake wells situated in random wave environment. Two wells are fabricated in 1:20 model scale and installed in the shallow wave basin and exposed to the random waves. The outer to outer face distance between two wells changed by concerning the outer diameter (D) of the well such that 1D, 1.5D and 2D. The wave run-up, diffraction wave height and free surface water oscillations inside the wells are measured. The distance between the two intake wells has a significant role in wave runup and free surface oscillation inside the well. Besides, the H/d have a substantial influence on the wave run-up on the seaward face compared to the side and shoreward face in all three cases. Also, the diffraction wave height is minimum when the wells are separated by 1.5D distance. Moreover, wave run-up and free surface water oscillation are optimum when the separation distance between the wells is 1.5D. - PublicationExperimental study on wave-structure interaction of an offshore intake well with a curtain wall(01-01-2020)
;kumar, V. Prabu; The present study focus on the wave-structure interaction of a caisson type offshore intake well with the regular waves. A 1:20 scale model is experimentally investigated with and without curtain wall in the shallow wave basin for its hydrodynamic responses like wave run-up, rundown, and free surface water oscillation inside the well. The wave run-up and rundown on all the faces record maximum when the scattering parameter (ka) is minimum. Moreover, the increase in relative wave height (H/d) results in an increase in the run-up on the seaward and shoreward faces. Besides, the free surface oscillation at the inlet and pumping chambers measures maximum when ka is minimum, and the influence of H/d keeps on reducing when the ka approaches the maximum value. The insertion of the curtain wall reduces the free surface oscillation at the pumping chamber when the relative water depth (d/L) ranges from 0.21 to 0.36.