Ivan Ehsan

Research

Patient-specific biofluid mechanics

3D CFD simulations using CT-scan-reconstructed human airway geometries: airflow, heat and moisture exchange, and aerosol and nanoparticle transport under varying, unsteady respiratory conditions. Built on polyhedral meshing, species-transport modelling, Lagrangian–Eulerian particle tracking, and custom boundary conditions through user-defined functions, with systematic validation against published experimental data.

Unsteady fluid dynamics & complex flow physics

Transient simulation of fluid and particle transport under time-varying boundary conditions; high-velocity hydrogen mixing and combustion in CONVERGE CFD; custom Fluent UDF development for unsteady wall and dynamic-meshing conditions.

CFD–experiment coupled studies

At IIT Bombay, CFD analysis and experimental testing of domestic pressure regulators for LPG systems and hydrogen–air premixed micro-combustors. Earlier, at CSIR-CMERI and IIT Jodhpur: SI-engine combustion simulation, bio-fuel combustion, and design and fabrication of a micro gas turbine test rig with full optical and emissions instrumentation.

Proposed research directions

PATIENT-SPECIFIC HEMODYNAMIC MODELLING

Translating clinical imaging (CT/MRI) into high-resolution cardiovascular geometries; transient, pulsatile blood-flow physics under resting and stressed physiological conditions.

COUPLED COMPUTATIONAL–EXPERIMENTAL FRAMEWORKS

Workflows where high-fidelity CFD metrics — wall shear stress, pressure drops — are directly validated with optical and pressure–flow diagnostics on physical setups.

NUMERICAL CUSTOMISATION & DIAGNOSTIC OPTIMISATION

Custom code development (UDFs) and data-driven analysis that turn complex hydrodynamic data into clear, interpretable metrics supporting clinical decision-making.

Research in pictures

Two-vortex merger — vorticity field at Re = 5000 (Basilisk)

Unsteady particle deposition in human airways — patient-specific CFD

Sandia hydrogen combustion simulation with adaptive mesh refinement

Patient-specific airway CFD simulation — Patient-specific airway CFD — nanoparticle deposition

Micro gas turbine fabrication — Fabrication of micro gas turbine

Thermal imaging of flame — Thermal imaging experience

Spectrometer measurement setup — Spectrometer flame measurement and MATLAB analysis

Composite insulation material evaluation — Evaluation of composite insulation coating

Computational & experimental skills

Computational	Experimental analogs
CFD solvers: ANSYS Fluent, CONVERGE, OpenFOAM, Basilisk	Flow loops: DAQ systems, ALICAT mass-flow meters, Testo 350 gas analyzer
Customisation: Fluent UDF coding (C), MATLAB analysis	Visualisation: High-speed Phantom cameras, CCD, StellarNet spectrometer
Post-processing: Tecplot, ANSYS post, OriginLab	Diagnostics: FLIR thermography, exhaust and emissions analysis

Publications

Tracing aerosols in the human airways: The hidden role of temperature gradients

S. Samanta, I. Ehsan, H. Hirani, S. Chakraborty

International Communications in Heat and Mass Transfer, 2026

KEY FOCUS — Thermophoretic aerosol transport in CT-reconstructed nasal and oral airways using a coupled airflow–heat–particle framework.

doi:10.1016/j.icheatmasstransfer.2026.110882

Anatomically-trained patient-specific in-silico simulations for predicting thermo-regulation and humidification in human body upper respiratory pathways

S. Samanta, I. Ehsan, H. Hirani, S. Chakraborty

International Journal of Thermal Sciences, 2026

KEY FOCUS — Heat and water-vapor transport analysed across two distinct airway geometries: a nasal and an oral airway model.

doi:10.1016/j.ijthermalsci.2025.110461

Patient-specific simulation of particle dynamics in the respiratory airways from CT-scan-reconstructed images using a continuous phase modelling framework

S. Samanta, I. Ehsan, H. Hirani, S. Chakraborty

Computer Methods and Programs in Biomedicine, 2025

KEY FOCUS — Baseline computational framework for patient-specific airway reconstruction and particle dynamics.

doi:10.1016/j.compbiomed.2025.110354

Virtual experiments reveal how human anatomy shapes risk from airborne nanoparticles Under review

S. Samanta, I. Ehsan, H. Hirani, S. Chakraborty

Research

Patient-specific biofluid mechanics

Unsteady fluid dynamics & complex flow physics

CFD–experiment coupled studies

Proposed research directions

PATIENT-SPECIFIC HEMODYNAMIC MODELLING

COUPLED COMPUTATIONAL–EXPERIMENTAL FRAMEWORKS

NUMERICAL CUSTOMISATION & DIAGNOSTIC OPTIMISATION

Research in pictures

Computational & experimental skills

Publications

Education

Bachelor of Technology, Mechanical Engineering

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