Abstract
Smoothed particle hydrodynamics (SPH) is a meshfree method and has been widely used in the field of fluid dynamics. However, there is still a lack of robust approach to implement the far-field boundary condition in the simulation of free stream flow past the rigid body. To solve this problem, on the basis of Lastiwka et al.’s work, an improved non-reflecting boundary condition, called mixed characteristic boundary condition is proposed in this paper. The mixed characteristic boundary condition is tested by two-dimensional incompressible flows with a perturbation at the initial moment. The numerical results show that the mixed characteristic boundary condition can effectively suppress the reflection of waves on far-field boundaries. Finally, flows past a hydrofoil are simulated within the framework of the kernel gradient free SPH in two kinds of non-reflecting boundary condition. The results indicate that the present boundary condition is more robust and suitable for SPH than the one adopted by Lastiwka et al.
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Acknowledgements
The work was financially supported by the National Natural Science Foundation of China (Grant nos. 51579222, 51120195001 and 51521064), the international collaboration and exchange program from the NSFC-RCUK/EPSRC (Grant no. 51761135011), Youth Funds of the State Key Laboratory of Fluid Power and Mechatronic Systems (Zhejiang University) (no. KLoFP_QN_1604) and the Fundamental Research Funds for the Central Universities (+2017XZZX001-02A). The authors are grateful to Prof. Mou Bin Liu, Dr. Peng Nan Sun, Xue Ying Peng and Dr. Qing Yang Liu who provided valuable guidance and useful suggestions for this work. The authors are also grateful to referees whose suggestions make this article better.
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Zhang, D.H., Shi, Y.X., Huang, C. et al. A mixed characteristic boundary condition for simulating viscous incompressible fluid flows around a hydrofoil. J Mar Sci Technol 24, 73–85 (2019). https://doi.org/10.1007/s00773-018-0532-8
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DOI: https://doi.org/10.1007/s00773-018-0532-8