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umax and υmax derived from the invariant region and from the numerical simulation using three sets of parameters in Table 2
| Parameters | Invariant region | Numerical solutions |
|---|---|---|
| Set 1 | (20, 2 + 20/ε) | (4, 4) |
| Set 2 | (80, 0.8 + 80/ε) | (8, 8) |
| Set 3 | (20, 2 + 20/ε) | (4, 8) |
