Research

My research ranges from laminar biologically relevant flows often coupled with interactions with tissues and devices to turbulent multiphase flows and supersonic turbulent reacting flows. The research impacts the fundamental understanding of flows of practical relevance for medical devices and combustion chambers .

Apart from my main field of research, I am also interested in ancient pre-Islamic Iranian studies.

Listed below are some of the outlines of my academic engineering research

Turbulent Spray Combustion

Numerical simulation of turbulent spray combustion in direct injection (DI) compression ignition engines is extremely challenging due to multi-scale and multi-time nature of liquid-gas interactions and the complexity of finite-rate evaporation, mixing and multi-step reactions. In this work, skeletal chemical kinetics is used via in situ adaptive tabulation (ISAT) for probability density function (PDF) based Modeling of combustion, termed two-phase filtered mass density function (FMDF) in high-order LES. The simulations were carried out using more than 600 parallel cores on Stampede

Study of High Injection Pressure Turbulent Sprays

The fuel spray behaviour in combustion and propulsion systems depend on a significant parameters like the fuel supply operating pressure and temperature, the nozzle geometry, the physical and chemical properties of the liquid or droplets, the flow turbulence and all parameters controlling the heat and mass transfer between phases. Large eddy simulations of high speed evaporating sprays are conducted to study spray interactions with the gas flow and turbulence generated by the spray.The interaction of spray induced gas flow and turbulence with the droplets is studied for different gas chamber densities and temperatures as well as different nozzle sizes and injection pressures.

Supersonic Turbulent Premixed Hydrogen Combustion

In a typical high speed combustion system, a primary low speed recirculation zone is needed to be established by a ramp or cavity since the main flow in the combustor is too fast for the flame holding. The hot reacting flow is trapped in the cavity or wake regions where the fuel and burning gas are circulated and mixed with cooler reactants outside the cavity. The burner can be fueled by injection at upstream locations, where a premixed mixture is formed before the combustion zone. In this work, the compressible filtered mass density function methodology is used for large eddy simulation of detailed chemistry hydrogen combustion in a cavity in supersonic turbulent flow.

Study of Volumetric Effects of Dispersed Liquid in Simulation of Moderately Dense Turbulent Droplet-Laden Flows

Typical applications such as spray combustion involve millions of dispersed droplets in a turbulent flow. In this project, emphasis is placed on accounting for droplet finite for evaporating droplets in numerical simulation of moderately dense droplet laden flows. In this approach, the particles are still assumed to be point sources and the forces acting on them are modeled using drag law and heat and mass transfers are governed by Nusselt and Sherwood numbers. The finite volume of the particles is accounted by modifying the carrier phase conservation equations to include the fluid volume fraction. The effect of the particles and their interactions onto the carrier fluid is felt through source terms to the gas phase equations for droplets that undergo collision, transport, heat and mass transfer. In addition, the fluid volume displaced by the particles also affects the conservation equations.

Page updated

Report abuse