Velocity divergence
= Velocity divergence
{title2=$\nabla\mathbin\cdot\mathbf u$}
The velocity divergence is the trace of the <velocity gradient>. It is the local fractional rate of volume expansion of a moving material element.
= Velocity divergence
{title2=$\nabla\mathbin\cdot\mathbf u$}
The velocity divergence is the trace of the <velocity gradient>. It is the local fractional rate of volume expansion of a moving material element.