Large-scale forcing with less communication in finite-difference simulations of stationary isotropic turbulence
✍ Scribed by Ryo Onishi; Yuya Baba; Keiko Takahashi
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 746 KB
- Volume
- 230
- Category
- Article
- ISSN
- 0021-9991
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✦ Synopsis
This study proposes a new forcing scheme suitable for massively-parallel finite-difference simulations of stationary isotropic turbulence. The proposed forcing scheme, named reduced-communication forcing (RCF), is based on the same idea as the conventional large-scale forcing scheme, but requires much less data communication, leading to a high parallel efficiency. It has been confirmed that the RCF scheme works intrinsically in the same manner as the conventional large-scale forcing scheme. Comparisons have revealed that a fourth-order finite-difference model run in combination with the RCF scheme (FDM-RCF) is as good as a spectral model, while requiring less computational costs. For the range 80 < Re k < 540, where Re k is the Taylor microscale-based Reynolds number, large computations using the FDM-RCF scheme show that the Reynolds dependences of skewness and flatness factors have similar power-laws as found in previous studies.