Talk:Boussinesq approximation (buoyancy)

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Hello everybody.

(newbie here). Anyone got examples of obviously non-Boussinesq flows that do not have the complication of surface energy?

Hello - I've just tidied up that section a little bit. The helical motion of rising air bubbles in water (due to pressure differences caused by helical boundary layer detachment) does not occur to the same extent for falling water droplets because the water droplets are significantly denser than the air. This isn't ideal though - because the inertial mass of the air bubble is significantly larger than it's actual mass due to the added mass of water than needs to be accelerated in order to accelerate the air bubble. I wasn't sure what the context of the last sentence was ("Boussinesq-approximation advantage: We need not to have temperature field to get dynamics.") so I removed it for reasons of clarity. Can anyone explain? Chrisjohnson 12:16, 16 March 2007 (UTC)