How can I expand this term ∇∙(φuu)

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The expansion of the term ∇∙(φuu) results in the formula φu∙∇u + u[∇∙(φu)], where φ is a scalar and u is a vector. Additionally, the term ∇∙(T×u), with T as a second-order tensor and u as a vector, expands to -u×(∇∙T) + T. These expansions utilize vector calculus identities, specifically the product rule for divergence. The discussion highlights the importance of correctly applying these identities to derive the necessary expressions.

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How can I expand this term ∇∙(φuu) and ∇∙(T×u)

∇∙(φuu) where φ is a scalar and u is a vector

and

∇∙(T×u) where T is a second order tensor and u is a vector.
 
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I found out that the solution for
∇∙(φuu) is φu∙∇u+u[∇∙(φu)]
for this the solution is just seemed like
∇∙(φuu) is φu∙∇u+u[∇∙(φu)]
∇∙(AB) is A∙∇B+B[∇∙(A)]
but I just can't fill in the step correctly in between
and
∇∙(T×u) is -u×(∇∙T)+T
 

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