
Santanu MitraShiv Nadar University · Mechanical Engineering
Santanu Mitra
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40
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Publications (40)
Savonius vertical axis wind turbine (VAWT) arrays are being studied for urban and semi-urban wind energy harvesting. With limited ground space in these areas, optimizing energy extraction through various array configurations is crucial. This study presents a computational fluid dynamics (CFD) analysis of a four-rotor Savonius VAWT array. Various un...
The present study proposes a novel bio-inspired blade design to improve the efficiency of a VAWT model. The design model features a curved blade that sweeps backward, same characteristics as the Bottlenose Dolphin’s flippers. The proposed model would enhances aerodynamic flow over the system and improves torque. The modified shape can cause the flu...
Darrieus vertical axis wind turbines are an omnidirectional type of turbine. The major concern with this type of turbine is its low efficiency. The experimental study focuses on implementing a bioinspired design. Humpback Whale flippers are mimicked for a novel design of a swept curved blade with leading-edge tubercles. A NACA4412 thin cambered pro...
The present research proposes novel swept-curved bioinspired blades for Darrieus wind turbine. The design was influenced by the curved flippers of the bottle-nose dolphin. The proposed model was designed using the Solidworks software, empirically tested for power improvement, later fine-tuned adopting high fidelity numerical modeling. An in-depth a...
A novel coupled computational fluid dynamics-deep neural network approach is proposed to accurately predict the performance of an artificially roughened solar air heater. Computational fluid dynamics data sets are used to develop an optimized neural network model for the prediction of thermal-hydraulic performance factor. The optimized neural netwo...
Savonius vertical axis wind turbines (VAWT) are very common off-grid power producing devices. The ideal environment for its operation is undisturbed freestream wind which is rarely available in urban surroundings. Operational environment has a significant effect on the performance of VAWT related to power production. The last decade has served as a...
Wake characteristics of wind turbines such as wake width, velocity deficit, and turbulence intensity are important factors for optimal placement of wind turbine rotors in an array in a typical wind farm. Reduced-order analytical wake models are useful tools in wind-farm layout design due to their simplicity and low computational demand. However, th...
A three-dimensional Computational Fluid Dynamics (CFD) analysis was conducted to examine the thermal and hydraulic characteristics of a solar air heater featuring transverse ribs for surface roughness. These transverse ribs possess a trapezoidal cross-section and are positioned in a non-continuous manner. The study also includes an investigation in...
A novel concept of rotating cylindrical ribs as artificial roughness in a solar air heater to enhance its thermo-hydraulic performance factor has been investigated using 3D computational fluid dynamics. The rotational speed is varied from 2000 RPM to 10,000 RPM on the static ribs optimised for height (e), diameter (d), longi-tudinal pitch (P), and...
A novel transverse trapezoidal staggered ribs configuration as artificial roughness is investigated using CFD to understand the fluid flow and heat transfer behaviors for improving the performance of a solar air heater. In addition, experimental validation of Nusselt numbers for smooth duct against CFD results is established. The staggered ribs arr...
Darrieus vertical axis wind turbines (VAWT) have various shapes associated with them; H-shaped devices are amongst the most common designs being used. To enhance the performance of these devices, nature-inspired tubercle shapes have been implemented to these H-shaped blade profiles. Humpback whale flippers inspire these tubercles. They have a sinus...
A hybrid computational fluid dynamics-artificial neural network approach is applied to predict the thermo-hydraulic performance factor (THPF) of a solar air heater with vertical cylindrical ribs. 3-D CFD analysis considering effects of rib height, rib diameter, rib pitches are simulated for Re ranging 5000-24000. A total of 504 data sets for differ...
A hybrid computational fluid dynamics-artificial neural network approach is implemented to predict the thermo-hydraulic performance factor of a solar air heater with rotating circular ribs. Effects of rib height, rib pitch, and rib rotating speed are investigated for Reynolds numbers ranging from 3800 to 18000. A total of 432 different cases are si...
Biomimetic and soft robotics research has been inspired by many biological organisms focusing on soft structural composites reinforced by stiff constituents. In the case of synthetic soft structural materials, hydrogels are very similar to the biological soft tissues/organs, owing to their “wet and soft” properties, their elastic performance, biode...
This paper presents an efficient and versatile OpenFOAM (Open-source Field Operation And Manipulation)-based numerical solver for fully resolved simulations that can handle any rigid and deforming bodies moving in the fluid. The algorithm used for solving Fluid–Structure Interactions (FSI) involving the immersed structure with changeable shapes is...
In this paper, we propose an idea of asymmetric bending in a fiber reinforced soft pneumatic actuator. The mixing of two intrinsically different elastomers Ecoflex 00-20 (Smooth-On, Macungie, PA, USA) and Dragon Skin 00-20 (Smooth-On, Macungie, PA, USA) with viscosities 3,000 cps and 20,000 cps respectively in various proportions and curing them al...
Nature has the best design, which has evolved over millennia for sustainability. The current research aims to provide a generalized algorithm for multi-legged fault-tolerant walking robots with 3 degrees of freedom per leg. An inverse-kinematics-based model has been implemented for strategic foot placement. Animals walk over rough ground and move e...
Numerical and Experimental Investigations on a Bio-inspired Design of Darrieus Vertical Axis Wind Turbine Blades with Leading Edge Tubercles
Computational Analysis of Symmetric and Cambered Blade Darrieus Vertical Axis Wind Turbine With Bio-Mimicked Blade Design
Biomimetics aims to take inspiration from nature and develop new models and efficient systems for a sustainable future. Bioinspired underwater robotics help develop future submarines that will navigate through the water using flexible propulsor. This research has focused on the Manta Ray species as batoid has a unique advantage over other species....
A novel concept of rotating circular ribs as artificial roughness has been employed within a two-dimensional rectangular duct to understand their effects on heat transfer and air flow characteristics using CFD. The effects of design parameters such as roughness height, roughness pitch, relative roughness height, relative roughness pitch, and rotati...
There has been a significant disruption in the energy market because of the pandemic. Now the focus is shifting towards investing more in renewable energy to address the present health and energy crisis. Wind power has gained special prominence in our clean energy transition as wind energy is the easiest to harvest, most ecient resources, and lowes...
A novel and strategic green energy production method that utilizes relative wind generated from moving vehicles is presented. A speeding train generates an enormous wake of wind around it, which stocks a substantial amount of kinetic energy. In this study, this freely accessible wind power is harvested by installing a modified savonius wind turbine...
Vibratory finishing processes are finding extensive use in multiple industries because of their ability to be able to provide a high level of surface finish. Despite their extensive applications, it is difficult to be able to develop predictive mechanism for the process, given its sensitivity to a wide range of parameters. Simultaneously, tradition...
Energy production from moving vehicles has attracted much attention in recent days. This is a novel and strategic green energy production method which utilizes relative wind generated from moving vehicles and self-starting Savonius rotor. A speeding train generates an enormous wake of wind around it, carries a substantial amount of kinetic energy w...
Savonius Wind turbines are special class of Vertical Axis Wind Turbines (VAWT). These are low cost drag driven turbines and are known to be inefficient.The performance of the new design is extensively studied on OpenFOAM-v1812, a popular open source CFD library. The flow equations coupled with equations of rotation of the turbine are solved on an o...
This study is focused on harvesting wind energy from gust produced by trains, that are moving inside tunnels by placing Savonius rotors alongside the trains. Numerical simulation shows that the conventional S shaped Savonius rotor fails to harvest energy under such conditions and hence a new design is proposed to generate useful power without compr...
Darrieus type vertical axis wind turbines (VAWT) are being used commercially nowadays; however, they still need to improve in terms of performance as they work in an urban environment where the wind speeds are low and the gusts are frequent. The aerodynamic performance of Darrieus turbine is highly affected by the wingtip vortices. This paper attem...
Nonrenewable fossil fuels are finite resources that will ultimately deplete in near future. Nature sheds colossal amount of renewable wind energy but humans harvest a morsel. Taking this into account a numerical study is proposed on wind energy harvesting from a speeding subway train. Subways trains generate a remarkable gust of wind that can be tr...
Renewable energy has a huge potential in the upcoming era due to the scarcity of fossil fuels. Taking this into account a 2D numerical simulation has been carried out to predict the performance of a five-bladed Darrieus H-type vertical axis wind turbine (VAWT). To this aim, a computational setup is built on a finite-volume method discretization of...
The work presented herein can broadly be categorized as a fluid–structure interaction problem. The response of a circular cylindrical structure subjected to cross flow is examined using the finite element method for both the liquid and the structure domains. The cylindrical tube is mounted elastically at the ends and is free to move under the actio...