For many complex flow problems such as those found in rotating machinery, or flows in expanding or spiral ducts, flow convergence can be accelerated if a better initial solution is used at the start of the calculation. The Full Multigrid initialization (FMG initialization) can provide this initial and approximate solution at a minimum cost to the overall computational expense.

For more information about using FMG initialization in Ansys Fluent, see Full Multigrid (FMG) Initialization in the User's Guide.

There are additional options that can be used with the density-based solver. For details, see Additional FMG Initialization Options with the Density-Based Solver in the Fluent User's Guide.