Development of a Non-Reacting LES Solver for Unstructured Grid

Abraham, Anoop Sam and Banerjee, Raja (2019) Development of a Non-Reacting LES Solver for Unstructured Grid. Masters thesis, Indian institute of technology Hyderabad.

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The present thesis consists of development of an LES based explicit solver which could simulate non reacting flows. The numerical simulation is carried out using Dynamic k equation subgrid scale model. Along with solving the Navier- Stokes equation a convection diffusion equation for mass fraction is also solved which would correct the equivalent density.The length and time scales for the mesh and simulations are calculated based on the Kolmogorov’s hypothesis and the CFL number is calculated accordingly.An explicit solver is used because of the fact that the calculated CFL number is extremely lower than 1. Two cases were validated using the above developed code, first is the case of an axisymmetric turbulent jet of air entering a quiscent atmosphere and the second one is the case where a variable density fluid(here Helium) entering the same quiscent air. The development of the plumes are captured.The development of the plume structures of both the cases are discussed. The averaged velocity profiles are also discussed. The mean velocity , turbulent fluctuations and Reynolds stresses are plotted. A brief study on the parallelisation technique used in OpenFoam is also done. Finally using the fluctuating data from both simulations the energy spectrum graphs are plotted which ensures that the mesh is suitable for the present study.

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IITH Creators:
IITH CreatorsORCiD
Banerjee, Raja
Item Type: Thesis (Masters)
Subjects: Others > Mechanics
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 26 Jun 2019 04:01
Last Modified: 26 Jun 2019 04:01
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