Dear all:

I am confused about the time evolution of the particle given in the reference: C. Aidun and J. Clausen, Lattice Boltzmann Method for Complex Flows. Annual Review of Fluid Mechanics, 2010. 42(1).

I . d(W)/dt + W x [I . W ] = T

I think that the angular momentum is I.W, so the equation should be d(I.W)/dt = I . d(W)/dt = T.

So I do not know the meaning of W x [I . W ]. I am very glad if anyone could you give an explanation. I need your kind help and thanks in advance.

Best Regards

Liang