Greek letters
ᾱ	Biot's coefficient
β	coefficient for the interpolation of the growth curve
${\gamma }_{\mathit{\text{growth}}}^t$	growth coefficient
${\gamma }_{\mathit{\text{necrosis}}}^t$	necrosis coefficient
${\gamma }_{\mathit{\text{growth}}}^{\overline{\mathit{\text{nl}}}}$	nutrient consumption coefficient related to growth
${\gamma }_0^{\overline{\mathit{\text{nl}}}}$	nutrient consumption coefficient not related to growth
${\theta }^{\overline{\overline{\alpha }}}$	macroscale temperature of the phase α
δ	exponent in the effective diffusion function for the oxygen
${\delta }_a^t$	additional necrosis induced by pressure excess
δliving	coefficient for the interpolation: thickness of the viable rim of tumor cells
ε	porosity
εα	volume fraction of the phase α
μα	dynamic viscosity of the phase α
ρα	density of the phase α
σc	coefficient in the pressure-saturations relationship
ςα¯	chemical potential
Ψα¯	gravitational potential
χα	solid surface fraction in contact with the phase α
${\omega }^{N\overline{t}}$	mass fraction of necrotic cells in the tumor cells phase
${\omega }^{\overline{\mathit{\text{nl}}}}$	nutrient mass fraction in liquid.
${\omega }_{\mathit{\text{crit}}}^{\overline{\mathit{\text{nl}}}}$	critical nutrient mass fraction in liquid for growth
${\omega }_{\mathit{\text{env}}}^{\overline{\mathit{\text{nl}}}}$	reference nutrient mass fraction in the environment