Dissipation rate as a function of fractional mass for the original Kuhfuß model and the Kuhfuß model including an ad hoc exponential decay of the dissipation length, shown with a grey dotted and a blue continuous line, respectively. The ad hoc exponential decay of the dissipation length leads to an increased dissipation rate at the beginning of the overshooting zone, indicated by the local maximum beyond the Schwarzschild boundary, followed by a sharp drop due to the rapid decay of TKE. The models have been chosen to have the same maximum TKE.