= Particle stresslet tensor
{title2=$S=-\operatorname{sym}\int_A\mathbf x(\boldsymbol\sigma\mathbf n)\,dS$}
= Stresslet tensor
{synonym}
The symmetric first moment of the <traction> exerted by a rigid inclusion, with the surface normal pointing into the inclusion. Its contraction with the background <rate-of-strain tensor> is the strain-related contribution to <extra dissipation due to a rigid inclusion>. A trace-free version is equivalent for an <incompressible flow>. This tensor is distinct from the axisymmetric <force-dipole flow> used as a far-field singularity.
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