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Flow, Turbulence and Combustion

, Volume 101, Issue 2, pp 413–432 | Cite as

A Band-Width Filtered Forcing Based Generation of Turbulent Inflow Data for Direct Numerical or Large Eddy Simulations and its Application to Primary Breakup of Liquid Jets

  • Sebastian KetterlEmail author
  • Markus Klein
Article

Abstract

Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES) of spatially inhomogeneous flows strongly depend on turbulent inflow boundary conditions. Realistic coherent structures need to be prescribed to avoid the immediate damping of random velocity fluctuations. A new turbulent inflow data generation method based on an auxiliary simulation of forced turbulence in a box is presented. The new methodology combines the flexibility of the synthetic turbulence generation with the accuracy of precursor simulation methods. In contrast to most auxiliary simulations, the new approach provides full control over the turbulence properties and computational costs remain reasonable. The lack of physical information and artificiality attested with pseudo-turbulence methods is overcome since the inflow data stems from a solution of the Navier-Stokes equations. The generated velocity fluctuations are by construction divergence-free and exhibit the non-Gaussian characteristics of turbulence. The generated inflow data is applied to the simulation of multiphase primary breakup.

Keywords

Turbulent inflow Band-width filtered turbulence forcing Large eddy simulation Direct numerical simulation 

Notes

Acknowledgements

Support by the German Research Foundation (Deutsche Forschungsgemeinschaft - DFG, GS: KL1456/1-1) is gratefully acknowledged. Computer resources for this project have been provided by the Gauss Center for Supercomputing/Leibniz Supercomputing Center under grant: pr48no. The authors are grateful to the developers of the PARIS-Simulator for providing the source code.

Funding

This study was funded by Deutsche Forschungsgemeinschaft (DFG) - GS: KL1456/1-1

Compliance with Ethical Standards

Conflict of interests

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. 1.Department of Aerospace EngineeringUniversität der Bundeswehr MünchenNeubibergGermany

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