Safi Ahmed

I have a Ph.D. in Mechanical Engineering with a focus on thermal-fluid CFD simulations. Recently I've been interested in solving flow PDEs and topology optimization of fluid flow problems in functional programming paradigm.
I love talking about theoretical and applied mechanics computations in Wolfram Mathematica. If you’re interested in these topics, feel free to reach out!

Computational Projects I’ve Worked On

1. Intelligent Microcontroller Design to Solve a Bearing Slippage Issue (Wolfram System Modeler)

This solo course project involved solving a bearing slippage issue in an autonomous underwater vehicle. The magnetic bearing in the thruster mechanism of the vehicle would slip due to the water drag. The task was to re-engage the thruster each time it slipped. To solve this problem, Hall effect sensors and the servo motor were interfaced with an Arduino using Wolfram Mathematica and System Modeler

LINK TO GITHUB REPOSITORY↗

2. Wolfram Summer School 2024 (Mathematica)

I had the opportunity to attend this highly selective program where I worked on solving partial differential equations for coupled flow using the FEM package of Wolfram Language. The project was completed under mentorship of Stephen Wolfram and the lead PDE developers at Wolfram Research.

POST ON WOLFRAM COMMUNITY WEBSITE ↗
SUMMARY ↗
MILESTONE 1 ↗
MILESTONE 2 ↗
MILESTONE 3 ↗

3. Spherical Heat Equation Solutions (Mathematica)

The Mathematica notebook visualizes the solution of the spherical heat equation. The temperature profile over a melting sphere and its surroundings is depicted. A Manipulate slider controls the time at which the temperature is plotted.

MATHEMATICA NOTEBOOK ↗

4. Solar-powered Air Conditioner (Mathematica)

I created a user interface using Wolfram language to input system parameters, such as the available solar collector area. The program generates system metrics such as operating temperatures and the percentage of energy demand met by solar power for a specified month.

MATHEMATICA NOTEBOOK ↗

5. Topology Optimization of Fluid Flow (implementation in Mathematica)

One of my ongoing projects is the topology optimization of heat transfer problems with implementation in Mathematica. Topology optimization refers to optimizing the arrangement of channels or structures within a heat sink to maximize cooling efficiency. Initially, the solid block is represented computationally. The algorithm iteratively refines the heat sink design to maximize temperature absorption and minimize pressure drop.

6. Mechanical Design of Award-Winning Robot

One of the most interesting projects I am proud of is my involvement in mechanical design as a team member for NightFury – a maze-traversing robot built from the ground up for the National Engineering Robotics Contest 2012 in Pakistan. The task to be accomplished was navigating a maze and placing balls into colored boxes in a specific order. My role in the team of four was machining and body fabrication, including cutting PVC pipes for ball holding. The robot was a semifinalist among 170+ teams and won the “Best Engineering Design Award.
DETAILS ↗

7. 3D Terrain Modeling for Rescue Robotics – IEEE Summer School (collaboration with NIST, USA)

I followed up the above robotics project by attending the IEEE Rescue Robotics Summer School 2012, for which I received full tuition along with a grant to travel to Alanya, Turkey to attend the summer school. There, I worked directly with the head of the Standard Robot Test Methods development at NIST, USA, and created a detailed 3D model of earthquake-stricken terrains. I presented this model to the worldwide RoboCup participants at the end of the summer school.
DETAILS ↗

Skills

Software :

  • Wolfram Mathematica: for solving partial differential equations, finite element analysis, and regular symbolic computing,.

  • ANSYS Fluent & COMSOL Multiphysics: for heat transfer and fluid flow simulations.

  • Wolfram System Modeler: for problem-solving in dynamic systems.

  • PTC Creo Parametric: for 3D sketching and computer-aided design.

  • Google Sheets & MS Excel: for data analysis.

Electronic Devices :

  • Arduino Mega coupled with Hall effect sensors: used in a major course project to solve a magnetic bearing slippage issue.

AI Tools :

  • ChatGPT: for quickly familiarizing myself with complex topics; for writing code.

  • Scite.ai: for finding specific information in academic literature.

  • LitMaps: for identifying research gaps in a field.

Programming Languages :

  • Wolfram Language & Modelica: for course projects and personal projects.

  • Python: for personal projects.

Publications

Hydrostructural phenomena in a wastewater screening channel with an ascendable sub-screen using the arbitrary Lagrangian–Eulerian approach
SA Memon, S Akhtar, HB Chae, DW Choi, CW Park
Applied Sciences, Vol. 14, No. 1, pp. 76, 2024.
DOI: https://doi.org/10.3390/app14010076

Enhancing heat transfer in microchannels: a systematic evaluation of crescent-like fin and wall geometries with secondary flow
SA Memon, S Akhtar, TA Cheema, CW Park
Applied Thermal Engineering, Vol. 239, pp. 122099, 2024.
DOI: https://doi.org/10.1016/j.applthermaleng.2023.122099

Enhancement of hydrothermal behavior in a microchannel heat sink including secondary flow
SA Memon
School of Mechanical Engineering, Kyungpook National University, Daegu, South Korea, 2024.
URL: https://dcollection.knu.ac.kr/srch/srchDetail/000000106551

Numerical investigation of solid–liquid dissolution for nutrient mixing improvement in a thin-layer cascade system
S Akhtar, SA Memon, S Siddiqa, CW Park
Waste and Biomass Valorization, pp. 1-15, 2023.
DOI: https://doi.org/10.1007/s12649-023-02180-x

Investigation of the hydrothermal phenomena in a wavy microchannel with secondary flow passages through mid-wall inflection points
SA Memon, S Akhtar, TA Cheema, CW Park
Applied Thermal Engineering, Vol. 223, pp. 120010, 2023.
DOI: https://doi.org/10.1016/j.applthermaleng.2023.120010

Hydrothermal investigation of a microchannel heat sink using secondary flows in trapezoidal and parallel orientations
SA Memon, TA Cheema, GM Kim, CW Park
Energies, Vol. 13, No. 21, pp. 5616, 2020.
DOI: https://doi.org/10.3390/en13215616

Investigation of the thermal performance of salt hydrate phase change of nanoparticle slurry flow in a microchannel
SA Memon, MB Sajid, MS Malik, A Alquaity, MMU Rehman, TA Cheema, MK Kwak, CW Park
Journal of Chemistry, Vol. 2019, 2019.
DOI: https://doi.org/10.1155/2019/5271923

Numerical analysis of entropy generation and pressure drop performance of phase change material slurries in microchannels of high heat generating electronic devices
MM Ali, SA Memon
Theoretical & Applied Science, Vol. 57, No. 1, pp. 1-8, 2018.
DOI: https://doi.org/10.15863/TAS.2018.01.57.1

Presentations

Sensitivity in topology optimization of heat sinks for IC chip cooling
100th International Congress of Theoretical and Applied Mechanics (ICTAM 2024), Daegu, Korea, 2024.

Numerical study on the phase change material applied flow in a microchannel
Advances in Functional Materials 2023 (AFM 2023), Fukuoka, Japan, 2023.

Investigation of thermal performance in microchannels with secondary flow
Fall 2021 Conference of the Korean Society of Visualization Information, Busan, Korea, 2021.

Thermal performance enhancement in a microchannel with secondary flow passage
Fall 2020 Conference of the Korean Society of Visualization Information, Gwangju, Korea, 2020.

Salt hydrate slurry flow characteristics in a microchannel
Fall 2018 Conference of the Korean Society of Visualization Information, Busan, Korea, 2018.

Cooling phenomenon of salt hydrate slurry flow in a microchannel
Spring 2018 Conference of the Korean Society of Visualization Information, Seoul, Korea, 2018.

Numerical study of slurry flow cooling performance with phase change nanoparticles in a microchannel
10th Intl. Conference on Computational Heat, Mass and Momentum Transfer, Seoul, Korea, 2017.

Personal

Introducing Bio & Experimental Fuid Engineering Lab where I currently work at (Korean!)

My favorite projects on Wolfram community:

1. Fluid Flow Analysis through Squared Arrangements of Pipes
by Giuseppe Parasiliti Rantone:

The project explores laminar and turbulent flows through fractal patterns like the Sierpinski carpet and the Menger sponge, under different boundary conditions. This project interests me because my current work involves solving partial differential equations using finite element methods.

2. Wolfram Models as Discretization Methods for Numerical Partial Differential Equation Solvers
by Yanal Marji:

This project discusses how Wolfram Models can be utilized for numerically solving partial differential equations. The Wolfram models can be represented by hypergraphs and causal graphs and have been converted into graphs on a Cartesian plane. These graphs are then used as discretizations to create meshes for solving the 2D Poisson and Burgers' equations.

Contact

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Email

safibta [at] gmail [dot] com

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