Accession Number:

ADA021165

Title:

Flow Forces on a Cylinder Near a Wall or Near Another Cylinder,

Descriptive Note:

Corporate Author:

CALIFORNIA INST OF TECH PASADENA

Personal Author(s):

• Roshko,A.
• Steinolfson,A.
• Chattoorgoon,V.

Report Date:

1975-06-01

Pagination or Media Count:

5.0

Abstract:

Lift, drag and pressure distributions have been measured on cylinders of various cross-section shapes near a wall. It is found that as the cylinder approaches the wall its drag decreases and a lift away from the wall develops. A similar development occurs for two cylinders approaching each other in a plane perpendicular to the flow but in this case there is a range of gap sizes for which the flow is asymmetrical and the forces on the two cylinders are different. The asymmetry is associated with an instability in the near-wake flow, and it can be flipped switched by small disturbances. The results are of interest for the effects of wind on cylindrical structures parallel to the ground, for pairs of structures, like stacks, near each other, etc. Author

Descriptors:

• *AIR FLOW
• *FLOW FIELDS
• *BOUNDARY LAYER FLOW
• WIND
• CYLINDRICAL BODIES
• DRAG
• LIFT
• FORCE(MECHANICS)
• AERODYNAMICS

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE