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Velocity gradient expression in 2D-axisymmetric

Hello,

the velocity gradient tensor for a 2D-axisymmetric problem presents, for the phiphi component, the following expression

chns.graduDGphiphi = if(abs(r)<0.0010*h,d(u,r),u/r)

does anyone know the meaning? I can guess that is introduced to avoid spurious effects at the axisymmetric boundary but still it is not totally clear to me.

Best,

J

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