Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

The new two-time-level dispersion improved CABARET scheme is developed as an upgrade of the original CABARET for improved wave propagation modelling in multiple dimensions and for nonlinear conservation laws including gas dynamics. The new upgrade retains many attractive features of the original CABARET scheme such as shock-capturing and low dissipation. It is simple for implementation in the existing CABARET codes and leads to a greater accuracy for solving linear wave propagation problems. A non-linear version of the dispersion-improved CABARET scheme is introduced to efficiently deal with contact discontinuities and shocks. The properties of the new linear and nonlinear CABARET schemes are analysed for numerical dissipation and dispersion error based on Von Neumann analysis and Pirrozolli's method. Numerical examples for one-dimensional and two-dimensional linear advection, the one-dimensional inviscid Burger's equation, and the isothermal gas dynamics problems in one and two dimensions are presented. © 2017

Department of Thermal and Energy Engineering

School of Mechanical Engineering

Vellore Campus

World University root node

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Computers and Fluids

Flux-corrected dispersion-improved CABARET schemes for linear and nonlinear wave propagation problems

23rd AIAA/CEAS Aeroacoustics Conference, 2017

Dispersion improved CABARET for computational aeroacoustics

The hybrid CAA method with propagation equations corresponded to the Goldstein generalized acoustic analogy and noise sources extracted from time-resolved LES solution is considered. In the current implementation, which includes sound propagation meanflow effects, noise source information was extracted directly from LES without any assumptions of statistic properties such as fourth-order velocity correlations, which makes this tool applicable for investigation of jet mixing noise without using any intermediate assumptions. Far-field noise and noise source statistics have been calculated for two subsonic single-stream jets. One jet is isothermal and the other is heated corresponding to temperature ratio (Tj/T0=2.5); they have the same acoustic Mach number (Uj/co=0.875) and correspond to jet conditions of model-scale tests recently conducted at the QinetiQ Noise Test Facility. For unsteady flow calculation, Monotonically Integrated Large Eddy Simulation (MILES) is used based on the high-resolution CABARET scheme. Flow field solutions and far-field noise predictions are compared with the experimental data available as well as with the results of the Ffowcs Williams - Hawkings solution based on the same set of LES data. © 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

21st AIAA/CEAS Aeroacoustics Conference

Empiricism-free noise calculation from LES solution based on Goldstein generalized acoustic analogy: Volume noise sources and meanflow effects