Tribology & Lubrication
Viscosity Index Simulator
A variable-controlled viscosity index laboratory with animated viscosity sweep, live gauge visualization, reference oil comparison bars, charts, governing equations, and exportable data.
Model
ASTM D2270
Dean & Davis
Mesh
61 nodes
Live sampled
Output
CSV
Export ready
Parameters
Oil type preset
Animated viscosity sweep
Governing Equations
Viscosity Index
VI = [(L − U) / (L − H)] × 100
Where
U = test oil visc @40°C, L = 0-VI ref, H = 100-VI ref
Current VI = 50.0 (Moderate).
Higher VI indicates less change in viscosity with temperature — desirable for engine oils.
Viscosity Gauge Diagram
Viscosity Index
50.0
VI Category
Moderate
Denominator (L−H)
50.0cSt
Numerator (L−U)
25.0cSt
VI vs Test Viscosity
Simulation Data
| Test Visc U (cSt) | Viscosity Index |
|---|---|
| 10.0 | 180.00 |
| 19.5 | 161.00 |
| 29.0 | 142.00 |
| 38.5 | 123.00 |
| 48.0 | 104.00 |
| 57.5 | 85.00 |
| 67.0 | 66.00 |
| 76.5 | 47.00 |
| 86.0 | 28.00 |
| 95.5 | 9.00 |
| 105.0 | -10.00 |
| 114.5 | -29.00 |
| 124.0 | -48.00 |
| 133.5 | -67.00 |
| 143.0 | -86.00 |
| 152.5 | -105.00 |
| 162.0 | -124.00 |
| 171.5 | -143.00 |
| 181.0 | -162.00 |
| 190.5 | -181.00 |
| 200.0 | -200.00 |