Sunil Manohar Dash

Sunil Manohar Dash
Indian Institute of Technology Kharagpur | IIT KGP · Department of Aerospace Engineering

Assistant Professor (IIT Kharagpur)

About

39
Publications
15,381
Reads
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219
Citations
Additional affiliations
April 2018 - present
Indian Institute of Technology Kharagpur
Position
  • Professor (Assistant)
December 2017 - April 2018
Indian Institute of Technology (ISM) Dhanbad
Position
  • Professor (Assistant)
December 2016 - December 2017
Singapore University of Technology and Design
Position
  • PostDoc Position
Description
  • Soft Robotics; Active Flow Separation Control.
Education
August 2010 - August 2014
National University of Singapore
Field of study
  • Computational Fluid Dynamics, Mechanical Engineering
July 2005 - May 2009
National Institute of Technology Rourkela
Field of study
  • Mechanical Engineering

Publications

Publications (39)
Conference Paper
Full-text available
In this paper, heat transfer characteristics of a square top-lid driven cavity of dimensions L×L with 4 different thermal wall boundary conditions are investigated. Additionally, we have modified the moving top lid length between 0.2L to 1.0L at a step of 0.2L. The mixed convection governing parameters like Richardson Number is varied as 0.1, 1.0 a...
Conference Paper
In this numerical study, we have investigated the transient and time-averaged thrust performance of a two-dimensional elliptic airfoil sinusoidally flapping near a flat ground surface. To characterize the ground effects on the aerodynamic performance of the flapping airfoil, we have varied the mean ground clearances of the airfoil, flapping frequen...
Article
Full-text available
In this article, the effect of the pivot point location on the thrust performance of a two-dimensional sinusoidal flapping elliptic airfoil in a forward flight condition is investigated using numerical simulations and in-house water tunnel experiments. On the chord line, three different pivot locations at a distance of 0.25c, 0.5c, and 0.75c from t...
Chapter
Full-text available
In this paper, the thrust performance of a two-dimensional flapping elliptic airfoil in a forward flight condition is numerically investigated for three different pivot point locations. When the pivot point location is changed, the leading edge vortex formation and shedding in a flapping cycle is modified as a consequence both transient and time-av...
Chapter
In this paper, the ground effects on a two-dimensional flapping elliptic airfoil is investigated at three different pivot locations. The numerical simulations are conducted using a finite volume solver at a fixed Reynold number of 5000. Five different ground clearances between 1c to 5c are considered to investigate the transient and time-averaged a...
Conference Paper
Full-text available
In this paper, the active flow separation control measures of two contra-rotating control cylinders to reduce the drag force of the main circular cylinder is numerically studied at Reynolds number of 100. Here, external energy is supplied to rotate the two identical control cylinders at the same speed. We have fixed the tangential distance of the c...
Conference Paper
Full-text available
In this paper, the thrust performance of the two-dimensional elliptic tandem flapping wings is numerically investigated on five different rear wings of chord length varying between 0.5C 1 to 1.5C 1 at an interval 0.25C 1. Here, C 1 is the chord length of the front wing that is kept constant. The aspect ratio (i.e. the ratio of the chord length and...
Article
Full-text available
In recent years, the lattice Boltzmann method has emerged as a promising numerical technique for solving complex fluid flow problems. This method has been successfully applied to both Newtonian and non-Newtonian fluids. Lately, the research in the field of the dynamics of non-Newtonian fluids inside a 2D square lid-driven cavity has attracted signi...
Article
In this paper, a dual splitter plate flow separation control device is introduced for a low Reynolds number flow (Re=100) around the square cylinder of length L to achieve higher drag reduction and improved wake regime control compared to the conventional single splitter plate control devices. Here, two splitter plates of the same length W (ranging...
Conference Paper
Full-text available
In this paper, the inertia effect of the moving lid on the steady flow regime of a two-dimensional lid-driven square cavity is investigated for different moving lid length using the lattice Boltzmann method. Here, the length of the moving top lid (L) is divided into stationary (Lx) and moving (L-Lx) parts, respectively. The characteristics of the f...
Conference Paper
Full-text available
In this study, a two-dimensional, steady, incompressible and laminar flow over the forward and backward facing trapezoidal cylinder is numerically investigated at Reynolds numbers 20 and 40. Here, by varying the taper angle and axial length of the trapezoidal cylinder, the steady-state wake flow regime, separation bubble length, and drag coefficien...
Conference Paper
In this numerical study, the effect of the size of the rear wing on the thrust performance of the 2D elliptical tandem flapping wing is investigated. Here, size ratio (SR), defined as the ratio of the chord of the rear to the front wing, is varied from 0.5 to 1.5 at an interval of 0.25 while keeping the aspect ratio (ratio of wing chord to thicknes...
Article
In this paper, a novel flexible forcing immersed boundary – simplified lattice Boltzmann method (FFIB-SLBM) is introduced to efficiently simulate two and three-dimensional fluid-solid interaction problems. Here, the simplified lattice Boltzmann method (Chen et al. [1]) with benefits such as lower virtual memories, ease in the implementation of the...
Article
Full-text available
In this article, the natural convection process in a two-dimensional cold square enclosure is numerically investigated in presence of two inline square heat sources. Two different heat source boundary conditions are analysed, namely, Case – 1 (when one heat source is hot), Case – 2 (when two heat sources are hot), using in-house developed flexible...
Conference Paper
Full-text available
In this paper, a low Reynolds number flow (Re=100) around the semicircular cylinder of diameter D with and without splitter plate is numerically investigated using in-house developed flexible forcing IB-LBM scheme. The length of the splitter plate is systematically varied from 0.5D to 4.0D to investigate its effect on the flow structure and on the...
Article
Abstract This study is motivated by our earlier investigation Lua et al. (2016) which shows that a two-dimensional elliptic airfoil undergoing sinusoidal flapping motion experiences thrust deterioration when the flapping frequency exceeds a certain critical value (or critical Strouhal number, St c r ). To alleviate this unfavorable thrust generatio...
Conference Paper
A novel travelling wave (TW) flow separation control strategy is developed to suppress the adverse downstream wake effects on a square cylinder of side, L, at low Reynolds number (Re=100). Our 2D numerical simulations suggest that when the downstream cylinder surface carries appropriately designed TWs, in the presence of an incoming flow of velocit...
Conference Paper
Full-text available
This paper presents results of numerical and experimental studies on a two-dimensional (2D) flapping elliptic airfoil in a forward flight condition at Reynolds number of 5000. The study is motivated by the investigation of [F.S. Hover, Haugsdal and M.S. Triantafyllou, J. Fluid Structure 19, 37 (2004)], which shows that the deterioration in thrust p...
Article
Abstract In this paper, results of three-dimensional numerical simulation and limited experimental study are presented on the sedimentation of two inline spheres in a Newtonian fluid at a Reynolds number (Re) range of 10 to 60. The study is motivated by the experiment of [Fortes (1987)] [1], which shows that two settling spheres uniquely experience...
Conference Paper
Past studies have shown that the thrust performance of a 2D airfoil undergoing simple harmonic motion in both pitch and heave in a forward flight condition is dependent on maximum effective angle of attack (αo) and Strouhal number (ST). For a given αo, it is found that the thrust coefficient (CT) increases with ST until it reaches a peak value at t...
Article
Full-text available
The present article aims to extend the previous numerical study on the natural convection process from a square enclosure with a vertical eccentric square heat source (cylinder) [1]. Here, we have investigated the buoyancy-induced convective flow and heat transfer for horizontal and diagonal eccentric displacements of the square cylinder. The numer...
Article
A novel flexible forcing hybrid immersed boundary-lattice Boltzmann model (IB-LBM) is introduced in the present paper for solving moving boundary problems. In conventional IB-LBM schemes, explicit formulations of force density term may not ensure no-slip boundary condition accurately, which leads to inaccurate force and torque calculations for movi...
Article
Full-text available
The recently proposed (Dash et al 2013) flexible forcing immersed boundary (IB) – lattice Boltzmann method (LBM) is improved in this work to simulate three dimension fluid-solid interaction problems. In conventional IB-LBM schemes explicit calculation of the force density may produce unsatisfactory no-slip boundary condition. This further leads to...
Article
Natural convection process in an annulus of a cold square enclosure with a hot eccentric square cylinder is simulated using a novel flexible forcing immerse boundary (IB) – lattice Boltzmann method (LBM). In the conventional IB–LBM schemes, the explicit force density calculation may not ensure the exact no-slip velocity/no-jump temperature bound...
Article
Full-text available
A novel flexible forcing immersed boundary (IB) – lattice Boltzmann method (LBM) – is introduced in this article to simulate a complex natural convection phenomenon. In the conventional IB-LBM schemes, the explicit computation of force density may not ensure the exact no-slip velocity/no-jump temperature boundary condition. This produces unphysical...
Article
Full-text available
A novel flexible forcing immersed boundary and lattice Boltzmann method (IB-LBM) is introduced in this paper. In the conventional IB-LBM, explicit calculation of force density term may not guarantee exact satisfaction of no-slip boundary condition. This produces unphysical streamline penetration into the solid immersed object. Therefore an implicit...
Conference Paper
Full-text available
A novel flexible forcing hybrid immersed boundary (IB) – lattice Boltzmann method (LBM) is introduced to simulate flow past freely falling spheres in a three dimensional rectangular channel. Compare to conventional IB-LBM schemes proposed algorithm is advantageous in both computational simplicity and mathematical formulation. In the conventional IB...
Article
In the present paper a novel hybrid immersed boundary (IB) - thermal lattice Boltzmann model (TLBM) is proposed. A heat source term is introduced into the energy equation to model the Dirichlet temperature effect of the immersed boundary. In this study an implicit approach is followed where the heat source term is obtained from an unknown tempe...
Conference Paper
Full-text available
Lattice Boltzmann (LB) algorithm is one of the allured research field among the scientists and researcher from last few decades. In this solver simulation of fluid flow in the computational domain is performed based on microscopic discrete Boltzmann equation and gas kinetics. Unlike the conventional non linear Navier-Stokes (NS) solver where pressu...
Article
Full-text available
Numerical study of impulsively started flow over two tandem square cylinders where former cylinder is rotated at angles (0-45deg) to main stream flow direction keeping later one inline to flow stream with a separation of twice the side length of square prism between the centers of cylinders is performed using FVM code solver FLUENT 6.3.26. Temporal...
Conference Paper
Full-text available
Flow past prismatic objects like square, rectangle prisms and circular cylinder have been considered as most fascinating research topic among various groups of researchers. Although flow over single prismatic bluff body case is extensively studied and well established results are published, only a few research reports on tandem arrangement of prism...
Article
Full-text available
Computer-aided process design programs, often referred to as process simulators, flow sheet simulators, or flow sheeting packages, are widely used in process design. Aspen HYSYS by Aspen Technology is one of the major process simulators that are widely used in chemical and thermodynamic process industries today. It specializes on steadystate analys...

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Projects

Projects (3)
Project
Observing the wake dynamics and force variations due to wake induced vibrations of tandem circular cylinder in low Reynolds number. We have varied the direction of vibrations (Only Y motion, Combination of X and Y motion), size and mass ratio of upstream and downstream cylinder.