Three Mach-uniform algorithms

摘要

We focus on the construction of Mach-uniform algorithms. The basic idea is to remove the severe time step restrictions for low speed flows, by treating the acoustic terms implicitly. The way to solve the obtained semi-implicit system can be chosen. Three different solution techniques are presented, varying between a fully coupled algorithm and a fully segregated pressure correction algorithm. We show that the number of time steps to reach steady state is comparable for the fully coupled as well as the fully segregated method. Therefore, the more segregation is introduced, the more efficient the calculation can be done.