A Comparative Study of Compressible Turbulent Flows Between Thermally and Calorically Perfect Gases
- By Xiaoping Chen1
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View Affiliations Hide Affiliations1 National Provincial Joint Engineering Laboratory for Fluid Transmission System Technology, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018 , Chin
- Source: Liutex-based and Other Mathematical, Computational and Experimental Methods for Turbulence Structure , pp 243-264
- Publication Date: April 2020
- Language: English
A Comparative Study of Compressible Turbulent Flows Between Thermally and Calorically Perfect Gases, Page 1 of 1
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In this chapter, direct numerical simulations (DNSs) of compressible turbulent flows for thermally perfect gas (TPG) and calorically perfect gas (CPG), including two wall temperature of 298.15K (low temperature condition) and 596.30K (high temperature condition), are performed to investigate the influence of a gas model on the turbulent statistics and flow structures. The results show that the influence of TPG is negligible and remarkable for low and high-temperature conditions, respectively. Many of the statistical characteristics used to express low-temperature conditions for CPG still can be applied to high-temperature conditions for TPG. The smaller the influence of the gas model on the mean and fluctuating velocity, the stronger the Reynolds analogy. The static temperature for TPG is smaller than that for CPG, whereas an inverse trend is found for turbulent and root square mean Mach numbers. Omega could capture both strong and weak vortices simultaneously for compressible flow, even TPG, which is difficult from Q. Compared to the results of CPG, the vortex structure becomes smaller, sharper and more chaotic considering TPG.
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