Lift and drag force and added mass(solid movement in Fluid)?
I want to calculate the force which is applied to the solid body which is moving in a fluid. Would you please let me know if I calculate the lift and drag force on my solid system, then the consideration of added mass is also needed or not? (Or calculation of added mass isn't necessary when we calculate the drag and lift force)
Definition of added mass: http://en.wikipedia.org/wiki/added_mass...
Thank you for your help
Best Regards
Answer:
Ok,
If the system is in uniform, (non-accelerating) motion, just calculate the lift and drag.
In hydrodynamics, especially in the US, we split the dynamic forces acting on a body into Added Mass and Damping. That is a convenient way of looking at the forces when you write a normal dynamic equation:
F = M d^2x/dt^2 + K dx/dt + C x
because the terms M (mass) and K (damping) apply to the acceleration and the velocity terms in the equation. So, Added Mass is the sum of those forces acting on a body which react like Mass (ie to acceleration). Damping is the sum of all those forces acting on a body which are reacting like Damping (ie with velocity) (like Lift & Drag). And of course, C is just a spring constant which reacts with length or distance.
So, if the body is not accellerating or decellerating, just calc lift and drag.
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