DNS analysis of wall heat flux effects on shock wave and turbulent boundary layer interactions

2022 ◽  
Author(s):  
Ryo Hirai ◽  
Soshi Kawai
Keyword(s):  
Boundary Layer ◽  
Shock Wave ◽  
Heat Flux ◽  
Turbulent Boundary Layer ◽  
Wall Heat Flux

Wall Heat Flux Under Persistent Vortices

2002 ◽  
Author(s):  
R. E. Breidenthal
Keyword(s):  
Boundary Layer ◽  
Heat Flux ◽  
Turbulent Boundary Layer ◽  
Turbulent Flows ◽  
Laminar Flows ◽  
Wall Heat Flux ◽  
Recent Theory ◽  
Turbulent Wall

It is commonly perceived that turbulent flows yield turbulent wall fluxes, while laminar flows yield correspondingly laminar wall fluxes. Experiments support a recent theory that turbulent flows can yield laminar wall fluxes if the flow is “persistent.” Adding strong, stationary vortices to a turbulent boundary layer lowers the wall heat flux to a laminar value.

The Response of a Turbulent Boundary Layer to a Double Step-Change in a Wall Heat Flux

1983 ◽  
Vol 105 (4) ◽  
pp. 841-845 ◽  
Author(s):  
J. Andreopoulos
Keyword(s):  
Boundary Layer ◽  
Heat Flux ◽  
Turbulent Boundary Layer ◽  
Growth Rates ◽  
Temperature Fluctuations ◽  
Step Change ◽  
Wall Heat Flux ◽  
Third Order ◽  
Double Step ◽  
Thermal Layer

Extensive measurements were made of the response of a turbulent boundary layer to a double step change of wall heat flux. The measurements include mean temperature and velocity as well as temperature-velocity correlations up to third order occurring in the ϑ2 and vϑ transport equations together with the skewness and flatness of temperature fluctuations. Two thermal layers start to develop within the primary boundary layer due to the change in heat flux at boundary. These layers are characterized with different growth rates which depend on the wall heat flux. Most of the changes in the downstream stations take place inside the second thermal layer.

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