Multiple solutions in a building with four openings ventilated by combined forces

Do multiple solutions of natural ventilation exist in complex buildings and what are the physical mechanisms that can lead to a such existence ? To answer that question the authors have examined a simple one-zone building with four openings using the simple macrocospic method of thermofluid modelling and have made a simulation of the four-opening building with a conventional network modelling computer program .
The results show a good agreement between the predicted ventilation flow rates by the network modelling method and the simple analytical solutions.