Virtual FFR Quantified with a Generalized Flow Model Using Windkessel Boundary Conditions

Table 2

FFR values for both lesions corresponding to the two flow models and the different outlet boundary conditions. Two different mesh files were used for these calculations: coarse mesh (14240 elements) and fine mesh (55353 elements).

Mesh size	Flow model	Outflow BC	FFR 1	FFR 2
Coarse mesh	Navier–Stokes	Windkessel	0.917	0.760
		Free outlets	0.710	0.119
		Mixed BC	0.717	0.885
	Generalized flow	Windkessel	0.908	0.7478
		Free outlets	0.698	0.106
		Mixed BC	0.722	0.8567
Fine mesh	Navier–Stokes	Windkessel	0.9515	0.8205
		Free outlets	0.8704	0.2459
		Mixed BC	0.7172	0.9891
	Generalized flow	Windkessel	0.9404	0.8039
		Free outlets	0.8096	0.2082
		Mixed BC	0.7229	0.9791