@article {5634,
	title = {Simulations for mechanical properties of polymer composites: investigations into suitability of numerical models for TPU-CNT with Mooney{\textendash}Rivlin (N = 1) and friction},
	year = {2022},
	month = {2022},
	abstract = {With rising demand to develop versatile composite materials for modern applications, computer-based solutions to arrive at the material characteristics are now preferred. This necessity is due to the large cost involved for the nanoadditives, as well as elaborate and precise setups required for detailed load tests or experiments. Even with the numerical simulations, considerable information has to arrive from experiments for these highly nonlinear viscoelastic materials. Stress accumulation and relaxation are important aspects that need prediction before considering composites for applications. Being a relatively new engineering domain, the significant information to use commercial codes like Ansys{\textregistered}, MSC{\textregistered}, or Abaqus{\textregistered} are now scattered in literature and the solvers themselves are still evolving. Our attempt through this work is to provide a comprehensive basic set of information on the same, while using Ansys{\textregistered} for arriving at the material characteristics of Thermoplastic Polyurethane-Carbon Nanotube (TPU-CNT) polymer composite. A simulation procedure to study stress relaxation behavior with Maxwell{\textquoteright}s Prony relaxation parameters is detailed, suitability of incorporating basic hyperelastic models, such as Mooney{\textendash}Rivlin and Ogden available in the solver, is compared, and the influence of coefficient of friction (COF) in the numerical simulations is investigated. On appropriate validation with available experimental results, we found that hyper-viscoelastic model is best suited for TPU-CNT with maximum error as low as 5\% during stress relaxation phase (for 1800~s), in comparison with 15\% and 25\% for viscoelastic and hyperelastic models. During the short loading phase of the material, none of the models are accurate. The two-parameter first-order equation-based Mooney{\textendash}Rivlin model fed with uniaxial load test information was satisfactory for low strain predictions in comparison with higher-order Ogden model. COF is found to significantly affect the solution, and a value of about 0.3 was found suitable for the present 0.05\% TPU-CNT composite. Further, we present the transient stress contours to show how the stress relaxation within the composite material would be predicted with each model.},
	isbn = {1573-2738},
	url = {https://doi.org/10.1007/s11043-022-09565-w},
	author = {Raj, Goutham B. and Ajanas Saludheen and Ajith Kumar Arumugham-Achari and Nivish George and Tony Chacko}
}
@article {SALUDHEEN2021,
	title = {Carbon fibre composite development for in-ground UAV{\textquoteright}s with NACA0012 aerofoil wing},
	journal = {Materials Today: Proceedings},
	year = {2021},
	abstract = {A carbon fibre reinforced polymer is designed for NACA0012 airfoil wing using a finite element model to determine the stresses and deformation by considering the aerodynamic loads from wind tunnel testing. The composite airfoil is designed for the use in morphing wings which are known to increase the aerodynamic efficiency of unmanned aerial vehicles. This paper deals with the design procedures of modelling a composite wing using different design variables in conformance to the first order shear deformation theory using ANSYS{\textregistered} 19.2 and optimizing the design by using a fourth degree polynomial found by surface fitting and genetic algorithm in MATLAB{\textregistered} R2020a. The analysis is carried out on 125 samples consisting of different materials, orientation and thickness. The pressure loads found from the wind tunnel testing was converted using weighted average method and applied in ANSYS{\textregistered} 19.2. While designing the airfoil, monocoque concept is used for structural integrity and this is implemented by the usage of Styrene acrylonitrile at the leading and trailing edges which has high strength to weight ratio. The composite laminae with a certain orientation and thickness is found to have the lowest deformation of 158~nm in response to the aerodynamic load.},
	keywords = {Carbon fibre reinforced polymer, Genetic Algorithm, Monocoque, Unmanned aerial vehicles, Weighted average method},
	issn = {2214-7853},
	doi = {https://doi.org/10.1016/j.matpr.2021.05.142},
	url = {https://www.sciencedirect.com/science/article/pii/S2214785321037184},
	author = {Ajanas Saludheen and Firaz {Muhammed Zakariya} and M Ankith and Nirmal Nandakumar and Jais George and Godwin Thankachen and R Renjith and A {Ajith Kumar} and A. Viswanath and P N Jithin}
}
@article {doi:10.1504/PCFD.2021.116537,
	title = {Effect of ground on the shape optimisation of a symmetric aerofoil at low angles of attack},
	journal = {Progress in Computational Fluid Dynamics, an International Journal},
	volume = {21},
	number = {4},
	year = {2021},
	pages = {209-221},
	abstract = {Numerical investigation on the aerodynamic characteristics of an optimised NACA0012 aerofoil in-ground effect (IGE) has been performed. Gradient-based shape optimisation was carried out using the ANSYS{\textregistered} 19.0 Adjoint Solver to augment lift over drag ratio (L/D) by at least 10\%, at various heights and angles of attack. SST k-ω turbulence model was chosen for the simulations, after its validation for out-of-ground effect (OGE) and performing wind tunnel tests for IGE. While the desired target of 10\% increase in the performance parameter was easily achieved through optimisation at low angles of attack (α < 6{\textdegree}), the frozen turbulence assumption in Adjoint Solver limited large shape alterations at higher angles of attack. Upper surface of the aerofoil had larger changes from original camber when compared to the lower surface. Also, the optimised profiles had significant modifications towards x/c >= 0.8. This signifies the suitability of trailing edge morphing for such applications.},
	doi = {10.1504/PCFD.2021.116537},
	url = {https://www.inderscienceonline.com/doi/abs/10.1504/PCFD.2021.116537},
	author = {Dennis Joseph and Ajith Kumar Arumugham-Achari and Jithin P Narayanan}
}
@conference {5540,
	title = {Shape Optimisation of NACA4412 In-Ground Effect-Selection of a Turbulence Model},
	booktitle = {ASME 2021 Fluids Engineering Division Summer Meeting.},
	volume = {1: Aerospace Engineering Division Joint Track; Computational Fluid Dynamics},
	year = {2021},
	month = {10 August},
	publisher = {American Society of Mechanical Engineers Digital Collection},
	organization = {American Society of Mechanical Engineers Digital Collection},
	edition = {ASME 2021 Fluids Engineering Division Summer Meeting},
	address = {Online},
	author = {Jithin. P.N and Ajith Kumar Arumugham-Achari}
}
@conference {3741,
	title = {Investigations on the shape optimization of NACA0012 in ground effect},
	booktitle = {21st Annual CFD Sympo Aeronautical Society of India 8-9 August 2019},
	year = {2019},
	month = {8th August 2019},
	publisher = {The Aeronautical Society of India (AeSI), Bangalore},
	organization = {The Aeronautical Society of India (AeSI), Bangalore},
	address = {S.R. Valluri Auditorium National Aerospace Laboratories Kodihalli, Bangalore 560 017},
	author = {Dennis Joseph and Ajith Kumar Arumugham-Achari and Chris Joseph and Digin M Biji and Franklin Jacob and A. Viswanath}
}
@conference {5394,
	title = {Numerical studies on the height stability of a shape optimized NACA 0012 In Ground Effect},
	booktitle = {64th International Congress of ISTAM 9-12 December, 2019, Indian Institute of Technology Bhubaneswar},
	year = {2019},
	month = {12 December},
	pages = {PID-302},
	publisher = {Indian Society Of Theoretical and Applied Mechanics (ISTAM)},
	organization = {Indian Society Of Theoretical and Applied Mechanics (ISTAM)},
	edition = {Proceedings of 64th International Congress of ISTAM 9-12 December,2019, IITKGP},
	address = {Indian Institute of Technology Bhubaneswar},
	author = {P N Jithin and Ajith Kumar Arumugham-Achari and Dennis Joseph and Asha Viswanath}
}
@article {Arumugham2019,
	title = {Structural behavior of a wing in deformable ground effect of a seaplane},
	journal = {International Journal of Recent Technology and Engineering},
	volume = {8},
	number = {1},
	year = {2019},
	pages = {217-222},
	author = {A. Jose and S. Janardhanan and A.K. Arumugham-Achari and R.P. Nair}
}
@conference {3653,
	title = {Numerical investigations on the wing-in-deformable ground effect for seaplanes},
	booktitle = {International Conference on Computational and Experimental Marine Hydrodynamics MARHY 2018},
	volume = {ISBN: 978-93-80689-31-9},
	year = {2018},
	pages = {34-36},
	publisher = {The Royal Institute of Naval Architects and IIT Madras},
	organization = {The Royal Institute of Naval Architects and IIT Madras},
	address = {IIT Madras},
	author = {A.K. Arumugham-Achari and S. Janardhanan and R.P. Nair and A. Jose}
}
@conference {3628,
	title = {A simple probabilistic model for predicting burst-leakage in water pipelines},
	booktitle = {International Multi-Conference on Computing, Communication, Electrical \& Nanotechnology (I2CN-2K18)},
	year = {2018},
	address = {Mangalam College Of Engineering, Kerala},
	author = {Anu Mol Joy and P. Radhika and Ajith Kumar Arumugham-Achari}
}
@article {3626,
	title = {A Comprehensive Framework for the Numerical Simulation of Evaporating Electrosprays},
	journal = {Aerosol Science and Technology},
	volume = {49},
	year = {2015},
	pages = {436-448},
	author = {Ajith Kumar Arumugham-Achari and Jordi Grifoll and Joan Rosell-Llompart}
}
@conference {3629,
	title = {Computer simulation of electrospraying of volatile liquids},
	booktitle = {RICTA 2014. The 2nd Iberian Meeting on Aerosol Science and Technology},
	year = {2014},
	address = {Tarragona, Spain},
	author = {Ajith Kumar Arumugham-Achari and Jordi Grifoll and Joan Rosell-Llompart}
}
@conference {3630,
	title = {Numerical simulations of evaporating electrosprays with Coulomb explosions},
	booktitle = {AEROSOL TECHNOLOGY 2014 (AT2014)},
	year = {2014},
	address = {Karlsruhe, Germany},
	author = {Ajith Kumar Arumugham-Achari and Jordi Grifoll and Joan Rosell-Llompart}
}
@conference {3631,
	title = {Effects of induced gas flow on electrospray dynamics},
	booktitle = {European Aerosol Conference (EAC 2013)},
	year = {2013},
	address = {Prague, Czech Republic},
	author = {Ajith Kumar Arumugham-Achari and Jordi Grifoll and Joan Rosell-Llompart}
}
@article {3627,
	title = {Two-Way Coupled Numerical Simulation of Electrospray with Induced Gas Flow},
	journal = {Journal of Aerosol Science},
	volume = {65},
	year = {2013},
	pages = {121-133},
	author = {Ajith Kumar Arumugham-Achari and Jordi Grifoll and Joan Rosell-Llompart}
}
@conference {3632,
	title = {Numerical Simulation of Electrospray Droplets Dynamics},
	booktitle = {V Reuni{\'o}n Espa{\~n}ola de Ciencia y Tecnolog{\'\i}a de Aerosoles (RECTA 2011)},
	volume = {CIEMAT (Madrid) ISBN: 978-84-7834-662-2},
	year = {2011},
	address = {Madrid, Spain},
	author = {Jordi Grifoll and Ajith Kumar Arumugham-Achari and Joan Rosell-Llompart}
}
@conference {3633,
	title = {Unsteady flow behind a blunt based POD model},
	booktitle = {IUTAM Symposium on Unsteady Separated Flows and their Control},
	volume = {14},
	year = {2007},
	publisher = {IUTAM Book series},
	organization = {IUTAM Book series},
	edition = {Proceedings of the IUTAM Symposium {\textquotedblleft}Unsteady Separated Flows and their Control{\textquotedblright}},
	address = {Corfu, Greece},
	author = {S.D.Sharma and AA Kumar}
}
