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

Figure 3

Phase portrait and vector field for scenario 1 (k > 0): (a) k = 10 and α = 0.05 of realization 2; (b) k = 10 and α = 0. 5, where the red point and blue point denote the equilibrium point of realization 1 and realization 2, respectively; (c) k = 10 and α = 1 of realization 1; (d) k = 10 and α = 1 of realization 2; (e) k = 10 and α = 2 of realization 1.

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