One of the major flow phenomena associated with low Reynolds number is formation separation bubbles on an airfoil's surface. NACA4415 airfoil commonly used in wind turbines and UAV applications. The stall characteristics are gradual compared to thin airfoils. primary criterion set for this work capture laminar bubble. Flow simulated a 120,000. numerical analysis carried out shows advantages disadvantages few turbulence models. models tested were: one equation Spallart Allmars (S-A), two SST...

The Humpback whale tubercles have been studied for more than a decade. Tubercle Leading Edge (TLE) effectively reduces the separation bubble size and helps in delaying stall. They are very effective case of low Reynolds number flows. current Computational Fluid Dynamics (CFD) study is on NACA 4415 airfoil, at 120,000. Two TLE shapes tested airfoil. tubercle designs implemented airfoil sinusoidal spherical. A parametric also carried out considering three amplitudes (0.025c, 0.05c 0.075c),...

In this work, the characteristic design of humpback whale flippers is incorporated and investigated on NACA 4415 airfoil at very low Mach number. The effect Tubercle Leading Edge NACA4415 has been studied. This novel study attempts to mimic tubercles wing improve lift delay stall. results showed significant improvement in aerodynamic performance TLE when compared CW. TLE, comparison with vortex generators, performed better. An by about 13.6% was obtained contrary only 6.3% increase case VG...

IPMC is becoming an increasingly popular material among scholars, engineers and scientists due to its inherent properties of low activation voltage, large bending strain, flexibility, softness, suitable response time which make them a strong candidate be applied as artificial muscle in biomimetic land underwater applications. The applications have been growing progression manufacturing techniques, development more accurate models control recently sophisticated actuator performed. In this...

Natural convection in cavities has been a field of interest to researchers over the past 50 years. One basic techniques used investigate natural is shadowgraph flow visualisation, experimentally observe boundary layer growth, formation double structures, intrusions and plume generation. This paper accounts for Various other observations also made when fins are placed along side wall cavity, effect due change shape orientation how these changes have discussed. The applications various types...

IPMC is used as artificial muscle in bioinspired micro structures/devices due to its low voltage actuation, high bending deformation, rapid response and capability be operated aqueous environment. In this paper, deflection analysis of actuated fin a fish like device presented find out angle attacks generated by under different voltages applied it. A novel approach perform motion mechanisms for biomimetic robots true actuation presentation the actuator. This paper also contributes present...

In this paper, a methodology is presented to perform force analysis of wing and fin assembly micro fish like device through strongly coupled two-way fluid structure interaction approach. The scanning operates underwater towed by surface vessel tow cable. Device fins are actuated ionic polymer metal composite (IPMC) actuators, an EAP actuator. Fins act as riser, depressor stabiliser against roll motion the device. During tow, come under hydrodynamic forces. These forces influenced...

Over the past few decades there has been a growing interest in designing structural component which is capable of absorbing large amount energy during impact. This so-called absorbers have found common usage many applications such as aircraft, automotive, and road barriers. paper presents crush analysis hollow square beam subjected to axial compression oblique loadings. Quasi-static dynamic numerical analyses using ANSYS finite element commercial package were carried out on various angles...

In this paper, a methodology is presented to perform dynamic analysis of structural linked mechanisms under true actuation cycle and force response applied IPMC actuators. Dynamic three link mechanism for fin micro fish like device, towed by surface vessel through tow cable, performed same applicable other biomimetic robotic applications. Fluid (water) exerts torque on actuated which function fin's deflection fluid flow velocity. assess the performance efficacy different loading conditions...

Flow over the ONERA M6 wing with vortex generators using more accurate higher order numerical schemes is studied computational methods. In this paper, effect of delta generator orientation on and its implication performance computed accurately second upwinding scheme. Turbulence modeling used k-omega sst. It has been found that results are comparable close to experiment. The analysis show co-rotating clockwise position effective than (anticlockwise) or counter rotating position. have control...

In this paper, a numerical simulation of three dimensional model IPMC actuated fin fish like micro device is presented using two-way fluid structure interaction approach. The towed by the surface vessel through tow cable. Fin acting as dorsal to control depth and also acts stabiliser against its roll motion. Fin's displacement disturbs water flow streamlines around it, result velocity pressure profile fluid's domain changes fin. As fin's position continuously throughout actuation cycle,...

In this paper, an improved Fourier series method is presented for vibration analysis of moderately thick annular and circular sector plates subjected to general elastic boundary conditions along its edges. literature, classical have been studied in detail however practical engineering applications the are not always nature. Therefore, study response these far needed. presented, artificial spring technique has employed simulate first order shear deformation theory formulate theoretical model....

The objective of the paper is to develop a mathematical model for reliable prediction dynamic behaviour towed modular system against variable ambient conditions. developed first step towards depiction tow shape and drag forces acting on system, comprising heavy cable an electro active polymer actuated fish. Initially, module presented chosen make it comparable previously model. Finally, validated by comparing its numerical results fairly finite element code, in literature. Furthermore,...