Figure 4From: A variational multiscale method for steady natural convection problem based on two-grid discretization The isotherms of two level variational multiscale method for natural convection problem. (a) \(\operatorname{Ra}=10^{3}\), (b) \(\operatorname{Ra}=10^{4}\), (c) \(\operatorname{Ra}=10^{5}\), (d) \(\operatorname{Ra}=5\times10^{5}\).Back to article page