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The truncation error for quadratic damping (1)

Definition of Rn: [mDtDtue]n+β|[Dtue]n12|[Dtue]n+12+s(uen)Fn=Rn.

Truncation error of the geometric mean, see (21)-(22), |[Dtue]n12|[Dtue]n+12=[|Dtue|Dtue]n14u(tn)2Δt2+14u(tn)u(tn)Δt2+O(Δt4). Using (3)-(4) for the Dtue factors results in [|Dtue|Dtue]n=|ue+124ue(tn)Δt2+O(Δt4)|×(ue+124ue(tn)Δt2+O(Δt4))

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