Department of Mechanical and Aerospace EngineeringNEWS & EVENTS
SEMINAR

Higher-accuracy edge-based schemes on unstructured meshes for simulation of turbulent flows and acoustic fields
Tatiana Kozubskaya
D.Sc., Senior researcher, Head of Computational Aeroacoustics Laboratory, Keldysh Institute of Applied Mathematics of Russian Academy of Sciences
Date  :  01 Sep 2017 (Fri)
Time  :  4:00 p.m.
Venue  :  Room 2571B, HKUST (2/F., Lift #27/28)

Abstract

The talk begins with a review of edge-based schemes for unstructured meshes and history of their development. The recent modifications of these schemes are mostly aimed at their accuracy improvement. They can be divided into two main families. The first family exploits the idea of quasi-1D edge-based reconstruction of variables whereas the second one – the flux correction procedures. The talk presents our achievements in both directions. First of all, they are the SEBR (simplified edge-based reconstruction) and UFC (unsteady flux correction) schemes respectively. The numerical results are given for model and benchmark problems with smooth and discontinuous solutions.

The second part of the talk concerns the applied problems which we have computed or are still computing with the use of higher-accuracy edge-based schemes. In particular, they include simulations of transonic cavity flow, jets, aerodynamic and acoustic characteristics of helicopter rotor and some other problems. Most predictions of turbulent flows are carried out with the help of hybrid RANS-LES nonzonal approaches DES, DDES, IDDES implemented in our in-house code NOISEtte. The integral Ffowcs Williams Hawkings method is used for the calculation of acoustic farfields. A brief description of the code precedes the numerical results. The computations are performed on Russian supercomputers Lomonosov of MSU, MVS-10P of JSCC and KIAM cluster K100. 

Brief Bio

Dr Tatiana Kozubskaya is a senior researcher at the M.V. Keldysh Institute of Applied Mathematics (KIAM) of Russian Academy of Sciences. After graduating from high school in Kaliningrad, she studied applied mathematics and mathematical modeling at M.V. Lomonosov Moscow State University. Her PhD thesis (1988) is devoted to numerical simulation of radiative gas dynamics problems. Since 2002, Dr Kozubskaya is a head of Computational Aeroacoustics Laboratory at the Institute of Mathematical Modeling (IMM) RAS and then at KIAM. In 2010, she was entitled to the academic degree of Doctor of Sciences in physics and mathematics. Her current scientific interests include high-accuracy numerical methods for hyperbolic problems for unstructured meshes, simulation of turbulent flows and turbulence-generated noise. She is involved in solving applied problems related, in particular, to aerodynamics and aeroacoustics of helicopter rotors, unsteady turbulent flows over airfoils, cavities and structural obstacles, acoustic liners. She participated in many national and European research projects. She was a team leader of FP7 European project VALIANT. Dr Kozubskaya is a member of the editorial boards of International Journal of Aeroacoustics and Acoustical Physics Journal.