Recent content by chaosma

I figured it out. First, use non-inertial frame, write down the NS equation with velocity w. Then let u=w+u_0 where u_0 is velocity of sphere.

If we consider a sphere oscillates in viscous fluid with frequency w, then sphere has velocity u=u_0*e^{-iwt} In Laudau's book, he defined the velocity of fluid is: v=e^{iwt}*F where F is a vector with only spatial variable involved. The boundary condition then becomes u=v at |x|=R, where R is...