Aircraft Stability and Control, NPTEL: Conducted a weekly tutorial session covering the concepts taught the previous week. Solved a range of theoretical and numerical questions that involve those concepts to help the student in gaining a confidence in those concepts.
MATLAB, CSJM, Kanpur: Conducted a workshop on the basics of MATLAB. Began with basics of programming. Introduced the general syntax and features of MATLAB. Familiarised the students with the definition of functions and how to call them. Focused on developing the algorithm from scratch before presenting the inbuilt functions. This way the students feel confident to write their own algorithm and code in any language when given a problem. Concepts dealt with include conditional statements, different kinds of loops and their nested versions.
Graduate Apprentice (Nov 2020 - Jan 2021)
Vikram Sarabhai Space Centre, ISRO
Worked on Aerodynamic analysis of Crew Escape System (CES), Gaganyaan on ANSYS and PARAS-3D (a computational fluid dynamics software developed by ISRO).
Aerodynamic Analysis of CES: Generated grids and meshes in PARAS-3D, over the model created in ANSYS. Aerodynamic data was generated for different roll, pitch and yaw orientations and for various grid fin deflections. The data thus obtained was depicted in relevant graphs to examine the aerodynamics loads.
Aerodynamic Analysis of TVP and SSLV: Similar work was carried out on the Test Vehicle Project (TVP) and Small Satellite Launch Vehicle (SSLV). The TVP is a vehicle that will extensively test the CES prior to the actual mission. The results for the SSLV were compared with actual flight simulations conducted at various Mach numbers.
Grid Fin FORTRAN code: Studied a grid fin analysis tool in FORTRAN and converted it into a modular and easy to access MATLAB code. Aerodynamic validations were performed on a variety of grid fin configurations found in literature.
Software Engineer (Aug 2017 - Jan 2020)
Sankya Systems and Objects Pvt. Ltd.
Worked on Aerodynamic analysis of Crew Escape System (CES), Gaganyaan on ANSYS and PARAS-3D (a computational fluid dynamics software developed by ISRO).
New Algorithm to extract Phase Difference from noisy background: Developed a new algorithm for conditioning Phase Difference (a polarimetry radar measurement) that extracts signal out of noisy environment and its derivative (Specific Differential Phase - Kdp) to aid in the accurate estimation of rainfall.
Parameter estimation: Analysed the significance of window size in the estimation of Specific Differential Phase (Kdp) from Phase difference through regression fitting. Implemented a method to use range distance (in Km) Vs (number of range bins) for efficient estimation.
Search Area method to compare rain fall: Designed and developed a ‘Search area’ based method (a new concept) to compare radar estimated rainfall with ground truths namely, rain gauge measurements. The search area is defined based on different error factors. This method has considerably reduced the disparity between the two, across more than 30 rain gauges in Kerala, demonstrated over three seasons of rain, namely heavy, normal and scanty.
Rain rate propagation models: Explored the efficiencies of a Linear and the Logarithmic (NEXRAD) rain rate propagation models in the estimation of rainfall from DWR measurement, and established that the latter is better.
Improved consistency: After the implementation of the above regimes, the rainfall estimated using two different radar return parameters (namely Reflectivity and Specific Differential Phase - Kdp) were seen to be consistent with each other over majority of rain gauges in southern half of Kerala over three seasons.
Analysis tools: Created and incorporated various additional tools to analyse the working of the above mentioned algorithms as well as other DWR measurements. These include multi-plot routine, histogram plotting, conditioned and raw radar measurement plotting etc.
Publications: The results of this analysis were presented at IRAD 2019, Pune. All the above works were documented and submitted to BEL and ISRO for review.
Reviews: Performed various analyses to satisfactorily answer the queries raised by ISRO at different stages of development.
