I'm calculating a kind of Navier-Stokes equation.
After one "solve", I get the velocity vector. Then
I'll evaluate displacement. Here, I have to transform
the velocity vector from Euler coordinates to Lagrange
coordinates, because of convective derivative:
vel: velocity at time t
u: displacement at time t
I : identity matrix
vel(t) = d_u/d_t + grad(u,t)*vel(t).
I need to do something like:
d_u/d_t = (I+grad(u,t))vel(t)
My question is, how to do it effectively? I don't want
to go over all elements, nodes again, to calculate the
Do you have good idea ?
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