Numerical study of air pollutants dispersion in an urban street canyon

Fig: Streamline around Baghbazar street at 6knots

This work is based on the study of the dispersion of pollutants in the urban street canyon of Kathmandu (Baghbazar). Experimental visualization and numerical work are carried out to understand the behavior of the flow considering the environmental conditions of Kathmandu. Thanks to Mr. Binayak Lohani for his major contribution and Mr. Bibek Parajuli for the successful completion of the thesis as group members under the guidance of Assistant Prof. Arun Bikram Thapa and Assistant Prof. Neeraj Adhikari.

Feasibility study of Dream Chaser Landing in GBIA using GNSS system

fig: The satellite observational geometry from the GAGAN network provides better confidence in satellite clock and orbit error corrections for Nepalese airspace.

In collaboration with Mr. Narayan Dhital from DLR, our research employed Model-Based Systems Engineering (MBSE) to analyze stakeholder interests, elicit requirements, conduct functional analysis, and synthesize designs. Our goal was to assess the feasibility of Dream Chaser Landing at Gautam Buddha International Airport using the Global Navigational Satellite System (GNSS). Drawing inspiration from NASA's space shuttle missions, we delved into re-entry trajectory optimization, terminal area energy management, and the critical final approach and landing phases. Our dedication led to a presentation at the esteemed NAST conference in 2022, allowing us to share insights and engage in meaningful discussions with fellow professionals in the field.

Fig: Garuda Rocket launched from Dhanusha

“Garuda Rocket” for Spaceport America Cup 2021

During my tenure as a Mechanical Design Engineer at the National Innovation Center for Spaceport America Cup 2021, I had the privilege of spearheading a groundbreaking project. My role involved the design and development of a converging-diverging nozzle for a sounding rocket, a significant milestone as it marked Nepal's inaugural foray into rocketry. This achievement was further underscored by our recognition with the prestigious Nancy Spirit Award. The project entailed a multifaceted approach, which included conducting external aerodynamics simulations using Ansys to ensure optimal rocket performance. Additionally, I played a crucial role in the preparation of a solid propellant grain and meticulously applied layers of fiberglass to the rocket's airframe, enhancing structural integrity by impregnating them with resin. This immersive internship experience not only contributed to the successful launch of Nepal's first-ever rocket but also enriched my skills and understanding of mechanical design in the context of aerospace engineering.

CFD of single and multiphase(gas-liquid)flow in a stirred tank reactor

Fig: Vector plot

I performed CFD of single and multiphase(gas-liquid)flow in a stirred tank reactor under the supervision of Dr. Raghvendra Gupta I compared the normalized radial and tangential velocities with experimental results in single-phase flow. The gas holdup, power number, and pumping numbers of the impeller against experimental results in gas-liquid flow in a stirred tank reactor are validated. The case file and report can be accessed here.