Table 1.

Model parameters.

Description	Parameter	Value	unit
Nutrient diffusivity	$D_n$	${10}^{-6}$	$\mu {\text{m}}^2{\text{Time}}^{-1}$
Bacterial density threshold	${\varphi }_{\text{cri}}$	0.1	$\mu \text{g}\mu {\text{m}}^{-3}$
Consumption rate	$R_c$	50	$\mu {\text{m}}^3\mu {\text{g}}^{-1}{\text{Time}}^{-1}$
Co-aggregation coef.	$R_{\alpha }$	15	$\mu \text{m}{\text{Time}}^{-1}$
Co-aggregation coef.	$\tau$	1	–
First species growth coef.	$R_{s1}$	500	$\mu {\text{m}}^3\mu {\text{g}}^{-1}{\text{Time}}^{-1}$
Second species growth coef.	$R_{s2}$	500	$\mu {\text{m}}^3\mu {\text{g}}^{-1}{\text{Time}}^{-1}$
Phase-field coefficient for $\alpha$	M	${10}^{-4}$	${\text{Time}}^{-1}$
Phase-field coefficient for ${\varphi }_1,{\varphi }_2\text{and}c$	M	0	${\text{Time}}^{-1}$
Phase-field coefficient (diffusivity)	${\epsilon }^2(D_b)$	${10}^{-8}$	$\mu {\text{m}}^2{\text{Time}}^{-1}$
2D Computational domain size		$100\times 100$	$\mu \text{m}$
Mesh size		0.5	$\mu \text{m}$