Effects of a Turbulent Free Stream and a Wall Roughness on the Flow Normal to a Cylinder at Subcritical Reynold's Numbers.

1978 ◽  
Author(s):  
Mark Moeller ◽  
D. Olivari
Keyword(s):  
Free Stream ◽  
Wall Roughness

The receptivity problem for O (1) wavelength Görtler vortices

1994 ◽  
Vol 446 (1928) ◽  
pp. 499-516 ◽  
Keyword(s):  
Boundary Layer ◽  
Short Wavelength ◽  
Free Stream ◽  
Wall Roughness ◽  
Boundary Layer Flows ◽  
Equivalent Problem ◽  
Vortex Stability ◽  
Roughness Elements ◽  
Forcing Functions ◽  
Generation Of Vortices

In this paper we make an investigation of the receptivity of boundary layer flows to Görtler vortex modes. A study by Denier et al . (1991) of the generation of vortices by wall roughness elements concluded that such elements are extremely poor as mechanisms to stimulate short wavelength modes. That work also examined the equivalent problem pertaining to O (1) wavelength modes but that analysis was flawed. We re-examine this problem here and demonstrate how the form of the wall roughness is crucial in determining the vortex stability characteristics downstream of the roughness. In particular we investigate the cases of both isolated and distributed forcing functions and show that in general a distributed function is much more important in generating vortices than are either isolated roughness or free-stream disturbances.

The Dependence of Demolding Characteristics on Side Wall Roughness of Mold in Thermal Imprint

2008 ◽  
Vol 128 (8) ◽  
pp. 325-330 ◽  
Author(s):  
Hiroaki Kawata ◽  
Junya Ishihara ◽  
Masayo Kayama ◽  
Masaaki Yasuda ◽  
Yoshihiko Hirai
Keyword(s):  
Side Wall ◽  
Wall Roughness
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