- **Main CFD Forum**
(*https://www.cfd-online.com/Forums/main/*)

- - **kinetic energy of rotating fluid flow**
(*https://www.cfd-online.com/Forums/main/107853-kinetic-energy-rotating-fluid-flow.html*)

kinetic energy of rotating fluid flowDear all,
For a rotating rigid body which is translating at the same time, the total kinetic energy= translation energy (1/2*mass*velocity^2)+rotational energy (1/2*moment of inertia*vorticity^2). However, would like to ask - for fluid flow which is rotating (such as vortex) and translating simultaneously, does the total kinetic energy=translation energy (1/2*density*velocity^2)+rotational energy (1/2*radius*vorticity^2)?? Thanks!:) |

Hi Abbie. No, the kinetic energy of the fluid particles is entirely accounted for in the first term of your equation (1/2*density*velocity^2), because the velocity vector includes the longitudinal and the tangential component. Otherwise you would be accounting for the rotation of the fluid to the kinetic energy twice.
Cheers, Michujo. |

All times are GMT -4. The time now is 09:40. |