Three-dimensional incompressible Navier-Stokes flow computations about complete configurations using a multiblock unstructured grid approach

Abstract

A multiblock unstructured grid approach is presented for solving three--dimensional incompressible inviscid and viscous turbulent flows about complete configurations. The artificial compressibility form of the governing equations is solved by a node--based, finite volume implicit scheme which uses a backward Euler time discretization. Point Gauss--Seidel relaxations are used to solve the linear system of equations at each time step. This work employs a multiblock strategy to the solution procedure, which greatly improves the efficiency of the algorithm by significantly reducing the memory requirements by a factor of 5 over the single-- grid algorithm while maintaining a similar convergence behavior. The numerical accuracy of solutions is assessed by comparing with the experimental data for a submarine with stern appendages and a high--lift configuration. Introduction Unstructured grid technology offers several advantages for applications to computational field simulation (CFS). The g...