Abstract:

According to the extrapolation scheme of boundary pressure in SIMPLE algorithm, the pressure formula of internal node near the boundary is derived with specified pressure boundary. Based on the feature of Neumann boundary for velocity, a new computational formula of boundary velocity is derived. The coupling of velocity and pressure is treated by using the IDEAL algorithm, and the steps in solving the fluid flow and heat transfer problem with specified pressure boundary are illustrated. The new method is compared with the methods used in the literature in solving several typical problems. Results show that the proposed method obviously enhances the accuracy of numerical solution and accelerates the convergence of iteration process.

Key words: specified pressure boundary, pressure equation, IDEAL algorithm