When the enable shearing is checked and calculated in the DPD task of mesocite, the viscosity is almost the same even when the shear rate is changed.

What could be causing this problem?

This structure is a system in which bead chains made of the same type of polymer exist.

Looking for information, it is said that if it is a 'Newtonian fluid', it has the same viscosity even if the shear rate is changed. Could it be because of this?