Fluid mechanics thesis

Full Presentation 4. Mathematical analysis of physics-based optical flow. Full Presentation 5. Lift enhancement by static extended trailing edge. Full Presentation 6.

Scaling, geometry and kinematics of bird flight. Full Presentation 7. Scaling analysis of propeller-driven aircraft for Mars exploration. Full Presentation 8. Bifurcating tube tree for gas transport.

Defended Thesis

Full Presentation 9. Determining bias error distribution.

Fluid Dynamics with Incompressible Schrödinger Flow

Full Presentation The image shows dripping from a horizontal thin film of fluid, showing satellite drop formation due to capillary waves. Flows driven by density differences occur in phenomena ranging from earth's climate to day to day cooking. The transport of fluid near the wall occurs in the form of sheets of rising lighter fluid and falling heavier fluid. The lighter lines in the image are the top view of rising sheets of fluid above a hot surface in turbulent convection; these sheets move and merge.

The Flow pattern in a Cavopulmonary vascular system are analysed for different geometry and flow parameters. The results from a finite element computation is validated with dye flow visualization and PIV. The image shows the resulting flow lines of haemodynamics.

Publications 2015 - 12222

Direct numerical simulation of flow past square cylinder by a code developed in-house. The inflow is embedded with high shear. Flow control is important in a wide range of systems and devices. Often active flow control is required to handle both internal and external disturbances to achieve desired goals. A closed loop feedback control system includes, sensors, actuators and a control algorithm. This approach is central to all types of laminar and turbulent shear flows. In the context of free shear flows, Karman vortex shedding past a circular cylinder is gradually stabilized through a simple momentum injection strategy as shown.

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Phase-field models are popular for moving boundary problems, where high throughput interface tracking is involved. Here, nucleation, crystal growth and dissociation are simulated using stochastic Phase-field Gillespie algorithm. A progressively expanding band of crystallinity can be noticed. Thermal hydraulics related to the design of the spallation target module of an Accelerator Driven Sub-critical ADS nuclear reactor system was investigated numerically using a Finite Element - RANS approach by predicting fluid flow and heat transfer characterstics.

The research focus is towards utilizing appropriate FEM based CFD techniques for simulating industrially complex flows to predict fluid flow and heat transfer in laminar and turbulent regimes. In Large Eddy Simulation LES of turbulent flows the unsteady large scale turbulent motion are explicitly computed and the small scales are modeled through a sub-grid scale model independent of the flow behavior.

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The present work aims at the prediction of the wall heat exchanges in a curved square duct for high Reynolds number turbulent flow. A decambering approach is used to study the post-stall aerodynamics of wings of different taper ratios.

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A numercial scheme is implemented using a lumped vortex model for an airfoil with wake relaxation to account for unsteadiness. The unsteadiness is introduced through the zero-normal boundary condition and at each time step a steady state potential flow equation is solved.

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  • LFMI – Laboratory of Fluid Mechanics and Instabilities.

On-going research is directed towards better prediction of the wake model, wake roll-up and separated wake. Upward flow through vertical fractures in limestone formations under a geothermal gradient favors dissolution and permeability growth. We investigate the transition from conductive and forced convective regimes to instability and buoyant convection as a result of permeability growth. This is an example of evolving natural system which may occur during geothermal heat extraction or carbon sequestration. Multi-scale heterogeneity is the striking feature of subsurface hydrological systems, and is often modeled using random field concepts.

Viscosity of Fluids & Velocity Gradient - Fluid Mechanics, Physics Problems