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Fourier time spectral method for subsonic and transonic flows

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Abstract

The time accuracy of the exponentially accurate Fourier time spectral method (TSM) is examined and compared with a conventional 2nd-order backward difference formula (BDF) method for periodic unsteady flows. In particular, detailed error analysis based on numerical computations is performed on the accuracy of resolving the local pressure coefficient and global integrated force coefficients for smooth subsonic and non-smooth transonic flows with moving shock waves on a pitching airfoil. For smooth subsonic flows, the Fourier TSM method offers a significant accuracy advantage over the BDF method for the prediction of both the local pressure coefficient and integrated force coefficients. For transonic flows where the motion of the discontinuous shock wave contributes significant higher-order harmonic contents to the local pressure fluctuations, a sufficient number of modes must be included before the Fourier TSM provides an advantage over the BDF method. The Fourier TSM, however, still offers better accuracy than the BDF method for integrated force coefficients even for transonic flows. A problem of non-symmetric solutions for symmetric periodic flows due to the use of odd numbers of intervals is uncovered and analyzed. A frequency-searching method is proposed for problems where the frequency is not known a priori. The method is tested on the vortex shedding problem of the flow over a circular cylinder.

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Acknowledgments

The research was supported by the State Scholarship Fund of the China Scholarship Council (Grant 2009629129).

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Authors and Affiliations

  1. School of Aeronautics, Northwestern Polytechnical University, Xi’an, 710072, China

    Lei Zhan

  2. Department of Mechanical and Aerospace Engineering, University of California, Irvine, CA, 92697, USA

    Lei Zhan, Feng Liu & Dimitri Papamoschou

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  1. Lei Zhan
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  2. Feng Liu
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  3. Dimitri Papamoschou
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Correspondence to Feng Liu.

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Zhan, L., Liu, F. & Papamoschou, D. Fourier time spectral method for subsonic and transonic flows. Acta Mech. Sin. 32, 380–396 (2016). https://doi.org/10.1007/s10409-015-0547-x

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  • DOI: https://doi.org/10.1007/s10409-015-0547-x

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