Divergence-free turbulence inflow conditions for large-eddy simulations with incompressible flow solvers Computers and Fluids
Divergence-free turbulence inflow conditions for large-eddy simulations with incompressible flow solvers Computers and Fluids
Synthetic turbulence for inflow conditions formulated on a 2-D plane generally produces unphysically large pressure fluctuations in direct numerical and large-eddy simulations. To reduce such artificial
fluctuations a divergencefree method is developed with incompressible flow solvers. The procedure of the velocity-pressure solvers is slightly modified on a vertical plane near (rather than at) the inlet by inserting the synthetic turbulence on that plane during the procedure. Simple analytic and numerical error estimations are used to show that the impact of the modified solvers on solution accuracy is small. The final synthetic turbulence satisfies the divergence-free condition. No additional CPU time is required to achieve this condition. The method was tested via simulations of a plane channel flow with Re_tau = 395. Reynolds stresses, wall skin friction and power spectra of velocity fluctuations are compared with those obtained from
using periodic inlet-outlet boundary conditions. In particular, the variances and power spectra of pressure
fluctuations are shown to be accurately predicted only when the divergence-free inlet condition is used.
inflow condition, divergence-free, pressure fluctuations, peak
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56-68
Kim, Yusik
5898caed-b9e9-4c9c-84cb-5634b0eec174
Castro, I.P.
66e6330d-d93a-439a-a69b-e061e660de61
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
June 2013
Kim, Yusik
5898caed-b9e9-4c9c-84cb-5634b0eec174
Castro, I.P.
66e6330d-d93a-439a-a69b-e061e660de61
Xie, Zheng-Tong
98ced75d-5617-4c2d-b20f-7038c54f4ff0
Kim, Yusik, Castro, I.P. and Xie, Zheng-Tong
(2013)
Divergence-free turbulence inflow conditions for large-eddy simulations with incompressible flow solvers Computers and Fluids.
Computers & Fluids, 84, .
(doi:10.1016/j.compfluid.2013.06.001).
Abstract
Synthetic turbulence for inflow conditions formulated on a 2-D plane generally produces unphysically large pressure fluctuations in direct numerical and large-eddy simulations. To reduce such artificial
fluctuations a divergencefree method is developed with incompressible flow solvers. The procedure of the velocity-pressure solvers is slightly modified on a vertical plane near (rather than at) the inlet by inserting the synthetic turbulence on that plane during the procedure. Simple analytic and numerical error estimations are used to show that the impact of the modified solvers on solution accuracy is small. The final synthetic turbulence satisfies the divergence-free condition. No additional CPU time is required to achieve this condition. The method was tested via simulations of a plane channel flow with Re_tau = 395. Reynolds stresses, wall skin friction and power spectra of velocity fluctuations are compared with those obtained from
using periodic inlet-outlet boundary conditions. In particular, the variances and power spectra of pressure
fluctuations are shown to be accurately predicted only when the divergence-free inlet condition is used.
Text
cnf2013b.pdf
- Author's Original
More information
Published date: June 2013
Keywords:
inflow condition, divergence-free, pressure fluctuations, peak
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Organisations:
Aerodynamics & Flight Mechanics Group
Identifiers
Local EPrints ID: 341146
URI: http://eprints.soton.ac.uk/id/eprint/341146
ISSN: 0045-7930
PURE UUID: d68633f9-6b5d-4ad8-be9f-05424c853512
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Date deposited: 16 Jul 2012 11:08
Last modified: 15 Mar 2024 03:20
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Author:
Yusik Kim
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