Fluent中Pressure Based求解器

参考帮助文档：35.3. Pressure-Based Solver Settings (ansys.com)

一、分类

1.1segregated types：

• SIMPLE

• SIMPLEC

• PISO

1.2coupled algorithm

二、各种求解算法比较：

2.1 SIMPLE vs. SIMPLEC

• SIMPLE is the default for transient simulations, but many problems will benefit from using SIMPLEC, particularly because of the increased under-relaxation that can be applied, as described below.

对不不是很复杂的求解问题，SIMPLEC收敛更快；

2.2 PISO algorithm

The PISO algorithm (see PISO in the Theory Guide) with neighbor correction is highly recommended for all transient flow calculations, especially when you want to use a large time step size. 

For problems that use the LES turbulence model, which usually requires a small time step size, using PISO may result in an increased computational expense, so SIMPLE or SIMPLEC should be considered instead.

PISO with skewness correction is recommended for both steady-state and transient calculations on meshes with a high degree of distortion.

2.3 Coupled

 The pressure-based coupled algorithm obtains a more robust and efficient single phase implementation for steady-state flows.（对于稳态单相流动，Coupled算法鲁棒性更好，效率更高）