Table 2.

Boundary conditions used in the 6-MPET model. The reader is referred to Vardakis et al., Guo et al. and Chou^{3,47,48,54–56} for further details. ∂Γs and ∂Γv are boundaries at the skull and cerebroventricular wall respectively, n is the outward unit normal vector and u₁ is the maximum ventricular displacement at each time increment.

6-MPET variable	Cortical surface	Cerebroventricular wall
u	u = 0	$-p_{V}n={\sigma }_{\mathrm{ij}}·n$
pa	$\nabla p_{a}n=Q_a$	$\nabla p_{a}n=0$
pc	$\nabla p_{c}n=0$	${\kappa }_{c\to \mathrm{vent}}\nabla p_{c}n=-Q_p$
pe	$p_e=p^v+{\mu }^{e}R{Q}_o$	$Q_p=\frac{\pi d^4}{128{\mu }_{e}L}(p_e{|}_{\partial {\Gamma }_V}-p_e{|}_{\partial {\Gamma }_S})-4\pi k_e(r_v+u_1^n)\nabla p_{e}n+4\pi {(r_v+u_1^n)}^2\stackrel{·}{u}$
pv	$p_{v}n=p_{\mathrm{bp}}$	$\nabla p_{v}n=0$
pl	$p_l=p_{\mathrm{ls}}$	$p_{l\prime }=p_{\mathrm{lv}}$
pg	$p_g=p_e$	$p_{g\prime }=p_{\mathrm{gv}}$