Journal
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
Volume 56, Issue 7, Pages 1408-1418Publisher
SCIENCE PRESS
DOI: 10.1007/s11433-013-5102-9
Keywords
DNS; compressibility effects; turbulent boundary layer
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Funding
- National Nature Science Foundation of China [11072248]
- National Basic Research Program [2009CB724100]
- National High-tech RD Program [2012AA01A304]
- CAS Information Project [INFO-115-B01]
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This paper reports the direct numerical simulation (DNS) for hypersonic turbulent boundary layer over a flat-plate at Ma (a)=8 with the ratio of wall-to-freestream temperature equal to 1.9, which indicates an extremely cold wall condition. It is primarily used to assess the wall temperature effects on the mean velocity profile, Walz equation, turbulent intensity, strong Reynolds analogy (SRA), and compressibility. The present high Mach number with cold wall condition induces strong compressibility effects. As a result, the Morkovin's hypothesis is not fully valid and so the classical SRA is also not fully consistent. However, some modified SRA is still valid at the far-wall region. It is also verified that the semi-local wall coordinate y* is better than conventional y (+) in analysis of statistics features in turbulent boundary layer (TBL) in hypersonic flow.
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