Velocity gradient of translating-sphere Stokes flow
= Velocity gradient of translating-sphere Stokes flow
Writing $u=A(r)U+B(r)(U\cdot x)x$ reduces its gradient to radial derivatives of $A,B$ plus the product rule for $(U\cdot x)x$.
= Velocity gradient of translating-sphere Stokes flow
Writing $u=A(r)U+B(r)(U\cdot x)x$ reduces its gradient to radial derivatives of $A,B$ plus the product rule for $(U\cdot x)x$.