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R Panner Selvam
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R Panner Selvam
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R Panner Selvam
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Panneer Selvam, R.
Selvam, Panneer
Panneer Selvam, RajamanickamÂ
Panneer Selvam, Rajamanickam
Selvam, Rajamanickam Panneer
Selvam, R. Panneer
Rajamanickam, Panneer Selvam
Selvam, Panneer R.
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4 results
Now showing 1 - 4 of 4
- PublicationEffect of anodes on wave loads of jacket members(20-04-2020)
;Nallayarasu, KasthuriOffshore structures such as jacket platforms have anodes fitted on their steel structural members to prevent corrosion. The anodes are projections on the surface of a tubular structural member and they increase the hydrodynamic forces and hydrodynamic coefficients of the tubular member. The effect of anodes on hydrodynamic forces and coefficients depends on several factors. The industrial practice to account for this effect is to multiply the total hydrodynamic force by a global factor, which may be conservative and uneconomical. The objective of this particular study is to determine the effect of location and orientation of anodes on wave loads and hydrodynamic coefficients of a cylinder, which have not been studied extensively to the authors’ best knowledge. The hydrodynamic forces and coefficients on a bare cylinder and a cylinder fitted with anodes were studied for regular waves of Keulegan-Carpenter (KC) number ranging from 0.42 to 1.91 in this experimental investigation. - PublicationModelling of Breaking Focused Wave Interaction with an Offshore Wind Turbine Support Structure in Intermediate Water(01-01-2021)
;Govindasamy, Vijaya Kumar ;Alagan Chella, Mayilvahanan; Offshore wind turbine (OWT) substructures are exposed to extreme waves under severe environmental conditions especially in intermediate and shallow waters. These extreme waves are highly nonlinear, which cause high intensity short duration impact forces on OWTs. The main objective of the study is to investigate numerically and experimentally wave impact forces on a vertical slender cylinder which resembles a monopile substructure for offshore wind turbines subjected to focused breaking waves in intermediate water depth. Both laboratory measurements and numerical simulations are performed in order to obtain more insights into the breaking wave impact problem. The total response forces on a monopile substructure were measured at higher resolution in a well-controlled programmable wave flume. In addition, acceleration of the monopile, the wave surface elevations around the breaking region were measured for different intensities of breaking wave impacts. Further, the evolution of focused breaking waves along the tank and their characteristics were examined. Numerical experiments are carried out in a computational fluid dynamics based three-dimensional numerical wave tank, REEF3D. The model is based on the incompressible Reynolds-averaged Navier–Stokes equations together with the k − ω for turbulence and the level set method for free surface. The experimentally measured main wave crest of the breaking focused wave group is fairly well captured in the numerical simulation. - PublicationA numerical investigation of flow past helically discrete straked (HDS) cylinder at sub-critical Re.(01-01-2022)
;Sarvalogapathi, S. ;Narendran, K.Almost every components in the offshore structures are cylindrical members which can be rigid or flexible. These structures experience huge unsteady vortex-induced forces due to the current loads resulting in fatigue failure. Passive and active flow control devices are usually employed to reduce the forces acting on the bluff body. The prime aspect of this study is to examine the performance of strakes to access the vortex-induced loads suppression on a circular cylinder. The different configurations of strakes arrangements presented in this paper are conventional continuous helical strakes (HS) and helical discrete strakes (HDS). The investigations are carried out using a commercially available CFD solver called STAR-CCM+ by employing Reynolds-Averaged Naiver-Stokes method (RANS) and implementing SST k - ω turbulence model. The drag and lift force coefficients of cylinder with strakes are compared to bare cylinder (BC) at Re=5000. From our studies it is observed that the cylinder with helically discrete strakes helps in suppressing vortex shedding process and reduce drag by 20% with respect to the cylinder with conventional helical strakes. - PublicationBenchmarking of VIV numerical analysis with prototype response for fatigue assessment of inverse catenary coldwater pipelines(01-03-2023)
;Saravanan, R.; ;Ramanamurthy, M. V.R.High density polyethylene pipe has been used to draw coldwater for low temperature thermal desalination plants since the year 2006 at Lakshadweep Islands, India. The pipeline endured in-line oscillations due to shear current in one of the desalination plants, and this gave an opportunity to observe the response parameters of the prototype pipeline. The recorded oscillation parameters are utilized as a benchmark to verify the results of the vortex induced vibration (VIV) analysis in frequency domain and time domain, and the results show good concurrence. The in-line fatigue damage assessment is carried out for a range of current profiles showing the need for mitigation of pipeline VIV. The helical strakes on a partial length of the pipeline is modeled numerically showing significant suppression of VIV response as well as substantial increase in fatigue life of the pipeline. The benchmarking of the VIV response analysis with prototype measurements enhances the reliability of using numerical VIV fatigue analysis and mitigation measures.