banner.jpg 204 Development of Coupled CFD and Structural Dynamics Simulation Module for Flexible Parachutes Ravi Krishna1,a, Vipin Kumar1,b, Sudhakar Prasad1, S P Singh1, S C Sati2, Abhishek Gupta3, Sandeep S.3, Basant Kumar Gupta3 and Gopal R. Shevare4 1Scientist, ADRDE(DRDO), Agra, India aravi_krishna@adrde.drdo.in bvipin_verma@adrde.drdo.in 2Director, ADRDE(DRDO), Agra, India. director@adrde.drdo.in 3Zeus Numerix Private Limited, Pune, India. sandeep.s@zeusnumerix.com 4Indian Institute of Technology Bombay, Mumbai, India. shevare@iitb.ac.in ABSTRACT

A procedure is presented to numerically simulate the parachute for its inflated shape and corresponding performance parameters such as aerodynamic drag & tensile stress. The procedure is planned so as to be utilized for detailed, ab-initio design of parachutes. It includes a large deformation FEM module to predict inflated shape of fabric canopy. Also, a CFD solver is integrated to estimate aerodynamic drag and to generate pressure distribution as input to FEM module. Practical aspects of parachute textile such as wrinkling, non-linearity and porosity are accounted. Gore parameters are used for parachute definition, much like the traditional design methodology.

Keywords: Parachute, Parameterization, Shape prediction, Aerodynamics, FEM, CFD.

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