Study of iterative algorithm convergence for numerical solving of problems of thermal convection in variables “stream function-vorticity”

The operator-difference equations, approximating the differential problems of thermal convection for an incompressible fluid in variables “stream function-vorticity” are examined; the issues of iterative schemes convergence for the implementation of their decisions are considered. Research is conducted by the priori estimates method. Limit values for vorticity are selected as Thom formulas. Evaluation of boundedness and the condition of uniqueness for solution of a problem are provided. By introducing auxiliary function of vorticity, given grid equations reduced to relationship with homogeneous boundary conditions. Implicit iterative algorithms for numerical implementation of solving of grid equations for which, when executing conditions equivalent to the uniqueness condition, estimations of convergence speed are received. The behavior of iterations in the case of a Stokes linear problem is analyzed. To illustrate the possibilities of considered iterative algorithms, the problem in a closed area with heated side is reviewed. Calculations on the iterative algorithm of variable directions are performed. The results of numerical calculations are analyzed.