It presents details of the results of natural convection flows for Ra≤10⁷ on semicircular cavity.The control volume finite element method based on unstructured grids and mass weighted upwind scheme is employed to discretize governing equations, and the fronts method is employed to solve the pressure discretization equations.For all of Ra≤10⁵, the present results are very agreement with the previous literature, and for Ra=10⁶、10⁷, the iterations have not run into the difficulty of convergence.