Participants 2015

Praveen Honhar

Name  

Praveen Honhar

University

Dept. of Aerospace Engineering Indian Institute of Technology, Kanpur

Supervisor

Prof. Dr. Eva Gutheil

Workgroup  

Multiphase Flows and Combustion

Project

Analysis of mixing models for use in turbulent spray combustion

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The understanding of turbulent spray combustion is essential for ensuring cleaner emissions and optimized performance of industrial burners, automotive and gas turbine engines. Spray combustion is challenging to model with classical CFD tools because turbulence, chemistry and spray evaporation interactions are interlinked in spray flames. A hybrid RANS-transported PDF method for the gas phase together with a Lagrangian particle tracking method for liquid droplets is an excellent method for modeling two phase spray combustion as the the turbulence-reaction and evaporation terms appear in closed form in this method. The detailed combustion chemistry can be considered through the use of a spray flamelet model. However, the effect of molecular diffusion and conduction must be modeled through the use of a micro-mixing model. The choice of the mixing model has a very high impact on parameters like gas-temperature profiles. The focus of the present work was to implement and compare the performance

of the mixing models other than the standard IEM model. As a part of the project the performance of Modified Curls and Parameterized Scalar Profiles mixing models were optimized and compared with the IEM model, using the experimental data of two ethanol spray flames for comparison. It was further shown that the optimized PSP model performed best amongst all the models.

Prashant Jalan

Name  

Prashant Jalan

University

Indian Institute of Technology, Kanpur

Supervisor

Prof. Dr. Filip Sadlo

Workgroup  

Computer Science and Engineering

Project

Visualization of the n-body system

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At the very broad level, this project tries to implement a system to study

the movement/flow of a particle in a n-body system. Such a system can have

various uses, for instance, it can be used to simulate the path of a

satellite in space given an initial velocity and position. The system also

tries to find the ideal position and velocitiy for the satellite launch.

 

Till now, FTLE (Finite Time Lyapunov Exponent) fields have been used to

study the movement of mostly massless particles in flow visualization. We

tried to adapt this approach for particles having mass. In a configurable

N-body system, we try to study the movements of such particles. If we

restrict the movement and velocity of these particles in two dimensions,

then we have four dimensions (position in x, position in y, velocity in x

and velocity in y). Similarly, if we allow 3D space, we have six

dimensions. We try to find ways of calculating the FTLE fields in these 4D

and 6D space, and study the movement of these mass bearing particles. Also,

we try to find a way of visualising these extra dimensional space.

 

Due to huge computation power required, we write codes for visualisation

and computation using Nvidia CUDA and OpenGL. We try to make use of

parallel computation to get the results fast in order to make the system

real-time or interactive.