SSRN Author: Deepak KumarDeepak Kumar SSRN Content
http://www.ssrn.com/author=2899492
http://www.ssrn.com/rss/en-usTue, 13 Mar 2018 02:45:52 GMTeditor@ssrn.com (Editor)Tue, 13 Mar 2018 02:45:52 GMTwebmaster@ssrn.com (WebMaster)SSRN RSS Generator 1.0REVISION: Study on Wake-Induced-Vibrations of Tandem Circular Cylinders at Low Reynolds NumberThe undamped vibrations of the downstream cylinder in the wake of the upstream cylinder (wake-induced vibration) have been studied in the present investigation. The cylinders are of identical diameters and are placed in a tandem arrangement at a distance of 5D (where D is the characteristic dimension of the cylinder; here diameter). The measurements are done at a Reynolds number (Re) of 100 over a range of reduced speed (1≤U*≤10). The modes of vortex shedding are studied along with interesting flow features at different U*.
http://www.ssrn.com/abstract=3102144
http://www.ssrn.com/1675174.htmlMon, 12 Mar 2018 09:22:28 GMTREVISION: Study on Wake Induced Vibrations of a Transversely Flexible Circular Cylinder at Low Reynolds NumberThe undamped vibrations of the downstream cylinder in the wake of the upstream cylinder (wake-induced vibration) have been studied in the present investigation. The cylinders are of identical diameters and are placed in a tandem arrangement at a distance of 5D (where D is the characteristic dimension of the cylinder; here diameter). The measurements are done at a Reynolds number (Re) of 100 over a range of reduced speed (1≤U*≤10). The modes of vortex shedding are studied along with interesting flow features at different U*.
http://www.ssrn.com/abstract=3102144
http://www.ssrn.com/1668688.htmlTue, 20 Feb 2018 11:17:33 GMTREVISION: Wake-Induced-Vibrations of Circular Cylinders in Tandem ArrangementStabilized space-time finite element technique is utilized to perform numerical simulation on the wake-induced-vibrations of two identical tandem circular cylinders placed in the flow at Reynolds number 100. Cylinders are separated by a center to center distance of 5 times the diameter of the cylinder. Results are computed for various values of reduced velocities (1 to 8). The downstream cylinder, of mass ratio 10, is allowed to execute oscillations in both in-line and transverse directions, whereas the upstream cylinder is stationary. Response curve of downstream cylinder is observed to be composed of initial and lower branches. Phenomenon of lock-in is identified at a reduced velocity of 5. Nature of flow exhibits periodicity for the entire range of initial branch with single dominant lift frequency. For reduced velocity near the end of lock-in, flow and body motion shows quasi-periodic behavior with complicated non-overlapping loops in the cylinder trajectory as well as in the ...
http://www.ssrn.com/abstract=3101982
http://www.ssrn.com/1666878.htmlTue, 13 Feb 2018 08:14:41 GMTREVISION: Wake-Induced Vibrations of Tandem Circular Cylinders of Different DiametersWake-induced vibrations (WIV) of two circular cylinders in tandem arrangement of different diameters (larger downstream cylinder) has been analyzed in the present work. The ratio of the diameter of first cylinder to that of the second cylinder (D<sub>1</sub>/D<sub>2</sub>) is kept constant at 0.8. The cylinder centers are separated by a distance S (= 5D<sub>1</sub>). The computations were carried out at Reynolds number (Re) = 100 over a range of reduced speed (U*). The fluid was assumed to be incompressible and flow to be two-dimensional. The flow equations were discretized using stabilized finite-element method and solved iteratively by Generalized Minimal RESidual (GMRES) technique. In the present work, the upstream cylinder is kept stationary while the downstream cylinder is allowed to traverse only across the flow. The observations focus the response, aerodynamic coefficients and flow features.
http://www.ssrn.com/abstract=3101305
http://www.ssrn.com/1666874.htmlTue, 13 Feb 2018 08:08:47 GMTNew: Wake-Induced Oscillations of Two Cylinders in Tandem at Low Mass RatioThe flow around two cylinders in tandem and the response of the downstream cylinder is numerically investigated. The upstream cylinder is fixed whereas the downstream cylinder is free to vibrate in the transverse direction only. The numerical simulations are carried for different values of reduced speeds, ranging from 1 to 8 while the Reynolds number remains fixed at Re=100. The blockage in the computational domain is taken as 2% and the mass ratio is unity. The non-dimensional gap-size between the centers of the two cylinders is taken to be 5 so that the downstream cylinder lies in the wake-interference zone. For the solutions, the governing equations are discretized with the aid of Finite Element Method (FEM) and the computation process is carried out using the Generalized Minimal RESidual (GMRES) iterative solver. The vortex shed from the upstream cylinder combines with the respective vortex of the downstream cylinder thereby adding to its strength. The flow remains periodic for ...
http://www.ssrn.com/abstract=3101308
http://www.ssrn.com/1666534.htmlMon, 12 Feb 2018 12:47:12 GMTREVISION: Wake-Induced Vibrations of Tandem Circular Cylinders of Different DiametersWake-induced vibrations (WIV) of two circular cylinders in tandem arrangement of different diameters (larger downstream cylinder) has been analyzed in the present work. The ratio of the diameter of first cylinder to that of the second cylinder (D<sub>1</sub>/D<sub>2</sub>) is kept constant at 0.8. The cylinder centers are separated by a distance S (= 5D<sub>1</sub>). The computations were carried out at Reynolds number (Re) = 100 over a range of reduced speed (U*). The fluid was assumed to be incompressible and flow to be two-dimensional. The flow equations were discretized using stabilized finite-element method and solved iteratively by Generalized Minimal RESidual (GMRES) technique. In the present work, the upstream cylinder is kept stationary while the downstream cylinder is allowed to traverse only across the flow. The observations focus the response, aerodynamic coefficients and flow features.
http://www.ssrn.com/abstract=3101305
http://www.ssrn.com/1666528.htmlMon, 12 Feb 2018 12:37:48 GMTREVISION: Study on Wake Induced Vibrations of a Transversely Flexible Circular Cylinder at Low Reynolds NumberThe undamped vibrations of the downstream cylinder in the wake of the upstream cylinder (wake-induced vibration) have been studied in the present investigation. The cylinders are of identical diameters and are placed in a tandem arrangement at a distance of 5D (where D is the characteristic dimension of the cylinder; here diameter). The measurements are done at a Reynolds number (Re) of 100 over a range of reduced speed (1≤U*≤10). The modes of vortex shedding are studied along with interesting flow features at different U*.
http://www.ssrn.com/abstract=3102144
http://www.ssrn.com/1666524.htmlMon, 12 Feb 2018 12:25:14 GMTREVISION: Wake-Induced-Vibrations of Circular Cylinders in Tandem ArrangementStabilized space-time finite element technique is utilized to perform numerical simulation on the wake-induced-vibrations of two identical tandem circular cylinders placed in the flow at Reynolds number 100. Cylinders are separated by a center to center distance of 5 times the diameter of the cylinder. Results are computed for various values of reduced velocities (1 to 8). The downstream cylinder, of mass ratio 10, is allowed to execute oscillations in both in-line and transverse directions, whereas the upstream cylinder is stationary. Response curve of downstream cylinder is observed to be composed of initial and lower branches. Phenomenon of lock-in is identified at a reduced velocity of 5. Nature of flow exhibits periodicity for the entire range of initial branch with single dominant lift frequency. For reduced velocity near the end of lock-in, flow and body motion shows quasi-periodic behavior with complicated non-overlapping loops in the cylinder trajectory as well as in the ...
http://www.ssrn.com/abstract=3101982
http://www.ssrn.com/1666257.htmlMon, 12 Feb 2018 08:28:29 GMT