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Papers by BHUPENDRA MORE gs0500272
Experimental Thermal and Fluid Science, Nov 1, 2015
In this paper, the fluid flow around two identical square cylinders arranged in tandem has been d... more In this paper, the fluid flow around two identical square cylinders arranged in tandem has been discussed. The upstream cylinder is oscillated in the transverse direction while the downstream cylinder is held stationary. The experiments are conducted at a Reynolds number of 295. Both the influences of spacing between two cylinders, as well as the effect of oscillation, of the upstream cylinder are investigated using Particle image velocimetry, hotwire anemometry and flow visualization techniques. The spacing ratios are varied from 1.5 to 5 while the upstream cylinder is oscillated in harmonics of the vortex shedding frequency of a stationary cylinder at the fixed amplitude. It is observed that there is a strong effect of spacing between the cylinders on vortex shedding mechanism and flow structures. When two cylinders are in tandem there is a critical distance below which vortex shedding of the upstream cylinder is suppressed. Three distinct flow regimes are captured and the detailed investigation of the intricate flow field is done both spatial and temporal domain. The vortex shedding frequency of a single stationary square cylinder is measured with hotwire anemometer and this frequency is being used to oscillate the upstream cylinder with its sub-harmonic, harmonic and super-harmonic frequency ratios. The effect of forcing frequency on flow interference, wake oscillation frequencies, aerodynamic forces and turbulence statistics have been studied for these spacing ratios. Flow fields are investigated in terms of the time-averaged drag coefficient, stream traces, vorticity contours, turbulence statistics and the time-dependent flow field is captured using flow visualization, vorticity contours, and Strouhal number.
Flow Around Three Side-by-Side Square Cylinders and the Effect of the Cylinder Oscillation
Journal of Fluids Engineering, 2019
In this study, the flow field over three square cylinders (SCs) arranged side by side is investig... more In this study, the flow field over three square cylinders (SCs) arranged side by side is investigated in a low-speed wind tunnel. The experiments are performed with three similar SCs for Reynolds number (Re) 295. The influences of spacing ratio on the wake size, drag coefficient, and flow interference of the cylinders are reported with the hotwire anemometry, particle image velocimetry (PIV), and the flow visualization techniques. Special attention is paid to the oscillation given to the middle cylinder and its effect on flow structure and related forces. The spacing ratio (s/D) ranges from 1.5 to 3, whereas the forcing frequency ratio ranges from 0.5 to 2 with amplitude of 10% of the cylinder width. It is observed that the spacing influences the flow structure, and the vortex shedding mechanism strongly. A secondary frequency appears in the flow field for spacing ratio s/D = 2 and 3. Depending upon the spacing ratios, the flow pattern is seen to be asymmetric biased, symmetric bias...
Journal of Fluids and Structures, 2018
The present work is an experimental investigation of flow control over a square cylinder using an... more The present work is an experimental investigation of flow control over a square cylinder using an attached splitter plate. The experiments are mainly conducted at a Reynolds number of 485. A splitter plate of varying length from 0 to 6 times of the cylinder width is attached to the rear side of the square cylinder to control the flow. The thickness of the splitter plate is kept constant at 10% of cylinder width. The flow interference of a square cylinder with an attached splitter plate is observed using PIV, Hot wire and flow visualization techniques. The primary focus is given on the flow structure and related forces. From the experiments, it has been observed that a secondary vortex appears at the tail edge of the plate after a particular length of the splitter plate. This vortex rotation is opposite to the main vortex and it influences the primary vortex shedding as well as shear layer formation. As a result, the plate modifies the wake size and flow structure behind the cylinder. The drag coefficient and the Strouhal number decrease with an increase in splitter plate length. A correlation is found between the splitter plate length, Reynolds number, and the drag coefficient. The effect of the splitter plate length on the flow field is also studied in terms of velocity, vorticity, streamlines, recirculation length, and turbulence statistics.
Investigation of Flow Interference Between Two Inline Square Cylinders With Different Spacing Ratios in Subcritical Reynolds Number Regime
Lecture Notes in Mechanical Engineering, 2016
When two cylinders are in proximity with each other the vortex shedding of one cylinder are influ... more When two cylinders are in proximity with each other the vortex shedding of one cylinder are influenced by the other. The flow field becomes even more complex when one cylinder subjected to an oscillation. In present study flow around two inline square cylinders of aspect ratio 50 at different spacing ratio is investigated experimentally. Experiments are performed for two identical square cylinders of 6 mm diameter at Reynolds number 500 in a low speed wind tunnel using Particle image velocimetry (PIV) and hotwire anemometer (HWA). The upstream cylinder is given predetermined oscillation and the gap between the two cylinders varied over wide range. Present study focused on effect of forcing frequency and spacing between centers of two cylinders (s/D = 1.5–5.0). The upstream cylinder is oscillated in transverse direction at f/f0 = 0 to 2 and the effect of this oscillation is observed behind the downstream stationary cylinder at different spacing of the cylinders by hotwire.
Effect of Attached Type Splitter Plate Length over a Square Prism in Subcritical Reynolds Number
Lecture Notes in Mechanical Engineering, 2016
Flow over a square prism with attached splitter plate is investigated at Reynolds number 485. Spl... more Flow over a square prism with attached splitter plate is investigated at Reynolds number 485. Splitter plate attached on the base of a square prism acts as a control for wake modification. By varying the splitter plate length the wake structure can be manipulated according to the need. In present study, we investigated the effect of splitter plate length attached to a square prism using Particle image velocimetry (PIV) and flow visualization techniques. The results are compared for both configurations with and without splitter plate. The length of the splitter plate are varies over wide range (L/D = 0−5) to characterize the near wake structure. Splitter plate thickness kept nominal with respect to cylinder size (0.1D). Increase in length of splitter plate changes the shear layer roll up distance and hence vortex formation region. Drag coefficient is reduced up to 41 % with the splitter plate as compared to prism without splitter plate. The detailed flow structures are investigated from flow visualization, velocity contours and vorticity contours.
Experimental Investigation of Flow Over a Transversely Oscillating Square Cylinder at Intermediate Reynolds Number
Journal of Fluids Engineering, 2016
This paper presents an experimental study of flow over a square cylinder oscillating in transvers... more This paper presents an experimental study of flow over a square cylinder oscillating in transverse direction. The Reynolds number selected for present study is 485. Limited study has also been made for two other Reynolds numbers, namely, 295 and 775. The objective of the present study is to modify the near-wake flow structure using actuation of the cylinder for possible reduction in drag force. Transverse oscillations to the cylinder are provided using electromagnetic actuators. The flow field is investigated using two-dimensional (2D)-particle image velocimetry (PIV) system, hotwire anemometer (HWA), as well as flow visualization techniques. The effect of oscillation frequency and the amplitude on parameters like Strouhal number, drag coefficient, recirculation length, power spectrum, and Reynolds stress are studied. It is observed that the recirculation length is reduced significantly with increase in forcing frequency, and consequently drag coefficient is also reduced. For a cons...
Numerical analysis of triangular prism at low Reynolds number
Materials Today: Proceedings, 2022
Experimental Thermal and Fluid Science, Nov 1, 2015
In this paper, the fluid flow around two identical square cylinders arranged in tandem has been d... more In this paper, the fluid flow around two identical square cylinders arranged in tandem has been discussed. The upstream cylinder is oscillated in the transverse direction while the downstream cylinder is held stationary. The experiments are conducted at a Reynolds number of 295. Both the influences of spacing between two cylinders, as well as the effect of oscillation, of the upstream cylinder are investigated using Particle image velocimetry, hotwire anemometry and flow visualization techniques. The spacing ratios are varied from 1.5 to 5 while the upstream cylinder is oscillated in harmonics of the vortex shedding frequency of a stationary cylinder at the fixed amplitude. It is observed that there is a strong effect of spacing between the cylinders on vortex shedding mechanism and flow structures. When two cylinders are in tandem there is a critical distance below which vortex shedding of the upstream cylinder is suppressed. Three distinct flow regimes are captured and the detailed investigation of the intricate flow field is done both spatial and temporal domain. The vortex shedding frequency of a single stationary square cylinder is measured with hotwire anemometer and this frequency is being used to oscillate the upstream cylinder with its sub-harmonic, harmonic and super-harmonic frequency ratios. The effect of forcing frequency on flow interference, wake oscillation frequencies, aerodynamic forces and turbulence statistics have been studied for these spacing ratios. Flow fields are investigated in terms of the time-averaged drag coefficient, stream traces, vorticity contours, turbulence statistics and the time-dependent flow field is captured using flow visualization, vorticity contours, and Strouhal number.
Flow Around Three Side-by-Side Square Cylinders and the Effect of the Cylinder Oscillation
Journal of Fluids Engineering, 2019
In this study, the flow field over three square cylinders (SCs) arranged side by side is investig... more In this study, the flow field over three square cylinders (SCs) arranged side by side is investigated in a low-speed wind tunnel. The experiments are performed with three similar SCs for Reynolds number (Re) 295. The influences of spacing ratio on the wake size, drag coefficient, and flow interference of the cylinders are reported with the hotwire anemometry, particle image velocimetry (PIV), and the flow visualization techniques. Special attention is paid to the oscillation given to the middle cylinder and its effect on flow structure and related forces. The spacing ratio (s/D) ranges from 1.5 to 3, whereas the forcing frequency ratio ranges from 0.5 to 2 with amplitude of 10% of the cylinder width. It is observed that the spacing influences the flow structure, and the vortex shedding mechanism strongly. A secondary frequency appears in the flow field for spacing ratio s/D = 2 and 3. Depending upon the spacing ratios, the flow pattern is seen to be asymmetric biased, symmetric bias...
Journal of Fluids and Structures, 2018
The present work is an experimental investigation of flow control over a square cylinder using an... more The present work is an experimental investigation of flow control over a square cylinder using an attached splitter plate. The experiments are mainly conducted at a Reynolds number of 485. A splitter plate of varying length from 0 to 6 times of the cylinder width is attached to the rear side of the square cylinder to control the flow. The thickness of the splitter plate is kept constant at 10% of cylinder width. The flow interference of a square cylinder with an attached splitter plate is observed using PIV, Hot wire and flow visualization techniques. The primary focus is given on the flow structure and related forces. From the experiments, it has been observed that a secondary vortex appears at the tail edge of the plate after a particular length of the splitter plate. This vortex rotation is opposite to the main vortex and it influences the primary vortex shedding as well as shear layer formation. As a result, the plate modifies the wake size and flow structure behind the cylinder. The drag coefficient and the Strouhal number decrease with an increase in splitter plate length. A correlation is found between the splitter plate length, Reynolds number, and the drag coefficient. The effect of the splitter plate length on the flow field is also studied in terms of velocity, vorticity, streamlines, recirculation length, and turbulence statistics.
Investigation of Flow Interference Between Two Inline Square Cylinders With Different Spacing Ratios in Subcritical Reynolds Number Regime
Lecture Notes in Mechanical Engineering, 2016
When two cylinders are in proximity with each other the vortex shedding of one cylinder are influ... more When two cylinders are in proximity with each other the vortex shedding of one cylinder are influenced by the other. The flow field becomes even more complex when one cylinder subjected to an oscillation. In present study flow around two inline square cylinders of aspect ratio 50 at different spacing ratio is investigated experimentally. Experiments are performed for two identical square cylinders of 6 mm diameter at Reynolds number 500 in a low speed wind tunnel using Particle image velocimetry (PIV) and hotwire anemometer (HWA). The upstream cylinder is given predetermined oscillation and the gap between the two cylinders varied over wide range. Present study focused on effect of forcing frequency and spacing between centers of two cylinders (s/D = 1.5–5.0). The upstream cylinder is oscillated in transverse direction at f/f0 = 0 to 2 and the effect of this oscillation is observed behind the downstream stationary cylinder at different spacing of the cylinders by hotwire.
Effect of Attached Type Splitter Plate Length over a Square Prism in Subcritical Reynolds Number
Lecture Notes in Mechanical Engineering, 2016
Flow over a square prism with attached splitter plate is investigated at Reynolds number 485. Spl... more Flow over a square prism with attached splitter plate is investigated at Reynolds number 485. Splitter plate attached on the base of a square prism acts as a control for wake modification. By varying the splitter plate length the wake structure can be manipulated according to the need. In present study, we investigated the effect of splitter plate length attached to a square prism using Particle image velocimetry (PIV) and flow visualization techniques. The results are compared for both configurations with and without splitter plate. The length of the splitter plate are varies over wide range (L/D = 0−5) to characterize the near wake structure. Splitter plate thickness kept nominal with respect to cylinder size (0.1D). Increase in length of splitter plate changes the shear layer roll up distance and hence vortex formation region. Drag coefficient is reduced up to 41 % with the splitter plate as compared to prism without splitter plate. The detailed flow structures are investigated from flow visualization, velocity contours and vorticity contours.
Experimental Investigation of Flow Over a Transversely Oscillating Square Cylinder at Intermediate Reynolds Number
Journal of Fluids Engineering, 2016
This paper presents an experimental study of flow over a square cylinder oscillating in transvers... more This paper presents an experimental study of flow over a square cylinder oscillating in transverse direction. The Reynolds number selected for present study is 485. Limited study has also been made for two other Reynolds numbers, namely, 295 and 775. The objective of the present study is to modify the near-wake flow structure using actuation of the cylinder for possible reduction in drag force. Transverse oscillations to the cylinder are provided using electromagnetic actuators. The flow field is investigated using two-dimensional (2D)-particle image velocimetry (PIV) system, hotwire anemometer (HWA), as well as flow visualization techniques. The effect of oscillation frequency and the amplitude on parameters like Strouhal number, drag coefficient, recirculation length, power spectrum, and Reynolds stress are studied. It is observed that the recirculation length is reduced significantly with increase in forcing frequency, and consequently drag coefficient is also reduced. For a cons...
Numerical analysis of triangular prism at low Reynolds number
Materials Today: Proceedings, 2022