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2. Rayleigh number - Wikipedia

   en.wikipedia.org/wiki/Rayleigh_number

   In fluid mechanics, the Rayleigh number (Ra, after Lord Rayleigh [1]) for a fluid is a dimensionless number associated with buoyancy-driven flow, also known as free (or natural) convection. [ 2 ] [ 3 ] [ 4 ] It characterises the fluid's flow regime: [ 5 ] a value in a certain lower range denotes laminar flow ; a value in a higher range ...

3. Vortex ring state - Wikipedia

   en.wikipedia.org/wiki/Vortex_ring_state

   The vortex ring state (VRS) is a dangerous aerodynamic condition that may arise in helicopter flight, when a vortex ring system engulfs the rotor, causing severe loss of lift. Often the term settling with power is used as a synonym, e.g., in Australia, the UK, and the US, [ 2 ] [ 3 ] [ 4 ] but not in Canada, which uses the latter term for a ...

4. List of TNA pay-per-view and livestreaming events - Wikipedia

   en.wikipedia.org/wiki/List_of_TNA_pay-per-view...

   This is a list of events held by the American professional wrestling promotion Total Nonstop Action Wrestling (TNA) on pay-per-view (PPV) and on streaming services. [1]From its inception, TNA's main output was a two-hour weekly program broadcast exclusively on pay-per-view.

5. List of predicted asteroid impacts on Earth - Wikipedia

   en.wikipedia.org/wiki/List_of_predicted_asteroid...

   This is a list of asteroids that have impacted Earth after discovery and orbit calculation that predicted the impact in ... 25 11:36: 14.9 N, 66.2 W Caribbean Sea ...

6. SpaceX rocket engines - Wikipedia

   en.wikipedia.org/wiki/SpaceX_rocket_engines

   First test firing of a Raptor development engine on 25 September 2016 in McGregor, Texas. Raptor is a family of methane/liquid oxygen rocket engines under development by SpaceX since the late 2000s, [2] although LH2/LOX propellant mix was originally under study when the Raptor concept development work began in 2009. [15]

7. Vortex-induced vibration - Wikipedia

   en.wikipedia.org/wiki/Vortex-induced_vibration

   Vortex-induced vibration (VIV) is an important source of fatigue damage of offshore oil exploration drilling, export, production risers, including steel catenary risers (SCRs) and tension leg platform (TLP) tendons or tethers. These slender structures experience both current flow and top-end vessel motions, which both give rise to the flow ...

8. Vortex shedding - Wikipedia

   en.wikipedia.org/wiki/Vortex_shedding

   Vortex shedding as winds pass Heard Island (bottom left) in the southern Indian Ocean resulted in this Kármán vortex street in the clouds In fluid dynamics , vortex shedding is an oscillating flow that takes place when a fluid such as air or water flows past a bluff (as opposed to streamlined) body at certain velocities, depending on the size ...

9. Blade-vortex interaction - Wikipedia

   en.wikipedia.org/wiki/Blade-vortex_interaction

   A blade vortex interaction (BVI) is an unsteady phenomenon of three-dimensional nature, which occurs when a rotor blade passes within a close proximity of the shed tip vortices from a previous blade.