Flow Over a Body of Revolution in a Steady Turn
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) PLATFORM SCIENCES LAB
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While the mechanisms of flow separation for a submarine in steady rectilinear flow are well understood, the flow separation behaviour of a submarine during a manoeuvre is not as well understood. The importance of this has led us to investigating the flow separation over a submarine-like body of revolution in a turn of fixed radius. The flow separation over the manoeuvring body is examined by using a deformed body placed in rectilinear flow to simulate the flowfield created by a body moving through a circular path. This method was used by Von Karman at the Guggenheim Airship Laboratory and by Gurzhienko in Moscow in the 1930s to investigate the manoeuvring of airships. The deformed model is constructed such that the local angle of attack is the same for a regular model placed in curved streamlines. Velocity should be varied linearly across the test section to ensure the local velocities at the deformed model surface are equal to the velocity along the manoeuvring model. Numerical simulations conducted using the CFD code FLUENT show the validity of this transformation. Results for a body placed in a rotating reference frame are compared to a deformed body in rectilinear flow.
- Lighter-than-air Aircraft
- Submarine Engineering
- Fluid Mechanics