A Four-Zone Model and Nonlinear Dynamic Analysis of Solution Multiplicity of Buoyancy Ventilation in Underground Building

Figure 5

Phase portrait and vector field for scenario 2. (a) α = 2 and k = −1 of realization 2; (b) α = 2 and k = −0.35 of realization 1; (c) α = 2 and k = −0.35 of realization 2; (d) α = 2 and k = 0.5, where the red dot indicates the equilibrium point of realization 1 and the blue dot represents the equilibrium point of realization 2; (e) α = 2 and k = 0.85 of realization 1; (f) α = 2 and k = 0.85 of realization 2; (g) α = 2 and k = 2 of realization 1.

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