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It is a difficult problem to realize the online simulation of fluid phenomena in a wide range of networking-based virtual reality scenes. Real-time solution and three-dimensional (3D) rendering of fluid dynamic process pose a great challenge to the online computing capability of networking. Aiming to model the spread characteristics of polluted gas, this paper constructs a polluted gas simulation model using computational fluid dynamics in a cloud computing environment. This model is flexible and accepts environmental parameters, such as the wind field and ground features in a cloud-based virtual world. Constrained boundary models are proposed for simulating the interaction between polluted gases and a virtual reality scene. An iterative semi-Lagrangian method with over-relaxation is adopted for a fast solution to the model with both simplicity and fidelity. The reported experiments show that our solution can …