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Application of Compact Schemes to Large Eddy Simulation of Turbulent Jets
Authors:Ali Uzun  Gregory A Blaisdell  Anastasios S Lyrintzis
Affiliation:(1) School of Computational Science and Information Technology, Florida State University, Florida, USA;(2) School of Aeronautics and Astronautics, Purdue University, Indiana, USA
Abstract:We present 3-D large eddy simulation (LES) results for a turbulent Mach 0.9 isothermal round jet at a Reynolds number of 100,000 (based on jet nozzle exit conditions and nozzle diameter). Our LES code is part of a Computational Aeroacoustics (CAA) methodology that couples surface integral acoustics techniques such as Kirchhoff's method and the Ffowcs Williams– Hawkings method with LES for the far field noise estimation of turbulent jets. The LES code employs high-order accurate compact differencing together with implicit spatial filtering and state-of-the-art non-reflecting boundary conditions. A localized dynamic Smagorinsky subgrid-scale (SGS) model is used for representing the effects of the unresolved scales on the resolved scales. A computational grid consisting of 12 million points was used in the present simulation. Mean flow results obtained in our simulation are found to be in very good agreement with the available experimental data of jets at similar flow conditions. Furthermore, the near field data provided by the LES is coupled with the Ffowcs Williams–Hawkings method to compute the far field noise. Far field aeroacoustics results are also presented and comparisons are made with experimental measurements of jets at similar flow conditions. The aeroacoustics results are encouraging and suggest further investigation of the effects of inflow conditions on the jet acoustic field.
Keywords:Large Eddy simulation  Turbulent jets  Jet noise  Dynamic smagorinsky subgrid-scale model  Compact finite difference schemes  Implicit spatial filtering
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