| SI.Length[nV] | dimensions | 4*crossAreas./perimeters | Characteristic dimension (e.g., hydraulic diameter) |
| SI.Area[nV] | crossAreas | pi*dimensions.*dimensions./4 | Cross sectional area of unit volumes |
| SI.Length[nV] | perimeters | 4*crossAreas./dimensions | Wetted perimeter of unit volumes |
| SI.Length[nV] | dlengths | ones(nV) | Unit cell length |
| SI.Height | roughnesses | fill(2.5e-5, nV) | Average heights of surface asperities |
| SI.Area[nV,nSurfaces] | surfaceAreas | [perimeters.*dlengths] | Discretized area per transfer surface |
| SI.Angle | angles | fill(0, nV) | Vertical angle from the horizontal (-pi/2 <= x <= pi/2) |
| SI.Length | dheights | dlengths.*sin(angles) | Height(port_b) - Height(port_a) |
| SI.Length | height_a | 0 | Elevation at port_a: Reference value only. No impact on calculations. |
| SI.Length | height_b | height_a + sum(dheights) | Elevation at port_b: Reference value only. No impact on calculations. |
| SI.Volume[nV] | Vs | crossAreas.*dlengths | Unit volumes |
| SI.Volume | V_total | sum(Vs) | Total volume of component |
| SI.Area[nV] | surfaceAreas_nVtotal | {sum(surfaceAreas[1, :]) for i in 1:nV} | Total surface area for each volume node |
| SI.Area | surfaceArea_total | sum(surfaceAreas_nVtotal) | Total surface area |
| Real[nV] | dxs | dlengths/sum(dlengths) | Fractional lengths |
