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Tandem cylinder flow and noise predictions using a hybrid RANS/LES approach

Tandem cylinder flow and noise predictions using a hybrid RANS/LES approach
Tandem cylinder flow and noise predictions using a hybrid RANS/LES approach
The performance of a novel hybrid RANS/LES methodology for accurate flow and noise predictions of the NASA Tandem Cylinder Experiment is investigated. The proposed approach, the modified Flow Simulation Methodology (FSM), is based on scaling the turbulence viscosity and the turbulence kinetic energy dissipation rate with a damping function. This damping function consists of three individual components, a function based on the Kolmogorov length-scale ensuring correct behaviour in the direct numerical simulation (DNS) limit, a function ensuring that FSM provides the correct damping in large-eddy simulation (LES) mode, and a shielding function that forces the switch from Reynolds-Averaged Navier–Stokes (RANS) to LES to occur outside the boundary layer. The FSM is proposed for the k ??-SST two-equation model (FSM-SST) and for an Explicit-Algebraic-Stress-Model (FSM-EASM), which is better suited to resolve anisotropy and non-equilibrium of the unresolved scales and the strain and rotation-rate dependent coefficients introduce a dynamic response of the model to the resolved flow field. Simulations are performed on a relatively coarse grid and the FSM data are compared with results obtained from the Scale-Adaptive-Simulation (SAS) and IDDES approaches. Acoustic predictions are obtained using an acoustic analogy approach based on Curle’s theory. The FSM-SST approach was found to predict the hydrodynamic field in very good agreement with reference data, whereas the FSM-EASM did not improve the predictions. The acoustic spectra predicted show good agreement with experimental results at various microphone positions, with some deficiencies in capturing the broadband noise levels at high Strouhal numbers.
0142-727X
Weinmann, M.
05a3c2f0-4ec9-4bc3-957f-98c55392de8f
Sandberg, R.D.
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa
Doolan, C.
aa3a8b34-3223-4828-9b1b-e4f0caa70662
Weinmann, M.
05a3c2f0-4ec9-4bc3-957f-98c55392de8f
Sandberg, R.D.
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa
Doolan, C.
aa3a8b34-3223-4828-9b1b-e4f0caa70662

Weinmann, M., Sandberg, R.D. and Doolan, C. (2014) Tandem cylinder flow and noise predictions using a hybrid RANS/LES approach. International Journal of Heat and Fluid Flow. (doi:10.1016/j.ijheatfluidflow.2014.08.011).

Record type: Article

Abstract

The performance of a novel hybrid RANS/LES methodology for accurate flow and noise predictions of the NASA Tandem Cylinder Experiment is investigated. The proposed approach, the modified Flow Simulation Methodology (FSM), is based on scaling the turbulence viscosity and the turbulence kinetic energy dissipation rate with a damping function. This damping function consists of three individual components, a function based on the Kolmogorov length-scale ensuring correct behaviour in the direct numerical simulation (DNS) limit, a function ensuring that FSM provides the correct damping in large-eddy simulation (LES) mode, and a shielding function that forces the switch from Reynolds-Averaged Navier–Stokes (RANS) to LES to occur outside the boundary layer. The FSM is proposed for the k ??-SST two-equation model (FSM-SST) and for an Explicit-Algebraic-Stress-Model (FSM-EASM), which is better suited to resolve anisotropy and non-equilibrium of the unresolved scales and the strain and rotation-rate dependent coefficients introduce a dynamic response of the model to the resolved flow field. Simulations are performed on a relatively coarse grid and the FSM data are compared with results obtained from the Scale-Adaptive-Simulation (SAS) and IDDES approaches. Acoustic predictions are obtained using an acoustic analogy approach based on Curle’s theory. The FSM-SST approach was found to predict the hydrodynamic field in very good agreement with reference data, whereas the FSM-EASM did not improve the predictions. The acoustic spectra predicted show good agreement with experimental results at various microphone positions, with some deficiencies in capturing the broadband noise levels at high Strouhal numbers.

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Published date: 22 September 2014
Organisations: Aeronautics, Astronautics & Comp. Eng, Aerodynamics & Flight Mechanics Group, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 370725
URI: http://eprints.soton.ac.uk/id/eprint/370725
ISSN: 0142-727X
PURE UUID: dbb5d4c2-a409-4516-bd81-a8a95b007e8d
ORCID for R.D. Sandberg: ORCID iD orcid.org/0000-0001-5199-3944

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Date deposited: 05 Nov 2014 11:28
Last modified: 18 Nov 2019 20:29

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