Abstract
The three-dimensional Navier-Stokes characteristic boundary conditions (3D-NSCBC), although physically reasonable and popular in many applications, may encounter the instability problem in simulating complex flows, especially for large Reynolds number reactive turbulence where locally the strong reversed flow appears at the outflow boundary surfaces. In the present work, a revised 3D-NSCBC strategy is proposed based on the kinematic relation in different moving coordinate systems. Following this strategy, a systematic formulation is presented for the outflow surface with local reversed flow and can be easily extended to the coupled edge and corner boundaries. Direct numerical simulation (DNS) tests of flow with different turbulence intensities are carried out. Compared with the conventional 3D-NSCBC, the newly proposed method exhibits satisfactory performance to confine numerical instability in the strong reversed flow region. The results confirm the robustness and effectiveness of this newly proposed algorithm.
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Acknowledgement
The authors are grateful to Prof. Chakraborty (Newcastle Univ.) for sharing the DNS code for numerical tests. LW acknowledges the funding support by National Science Foundation China (NSFC) under the grant No. 91441116, NSFC-CNRS joint research project (No. 11611130099, NSFC China, and PRC 2016-2018 LATUMAR “Turbulence lagrangienne: ´etudes num´eriques et applications environnementales marines”, CNRS, France).
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Zhao, P., Wang, L. Revised Three-Dimensional Navier-Stokes Characteristic Boundary Conditions for Intense Reactive Turbulence. J. Shanghai Jiaotong Univ. (Sci.) 23, 190–201 (2018). https://doi.org/10.1007/s12204-018-1925-x
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DOI: https://doi.org/10.1007/s12204-018-1925-x