33.12 Solution Methods Task Page

The Solution Methods task page allows you to specify various parameters associated with the solution method to be used in the calculation.

Controls

Formulation   provides a drop-down list of the available types of solver formlations: Implicit and Explicit.

This item appears only when the density-based solver is used.

Flux Type   provides a drop-down list of the convective flux types: Roe-FDS, AUSM, and Low Diffusion Roe-FDS. Details about each of the flux types can be found in this section in the separate Theory Guide.

Pressure-Velocity Coupling   contains settings for pressure-velocity coupling schemes.

Scheme   provides a drop-down list of the available pressure-velocity coupling schemes: SIMPLE, SIMPLEC, PISO, and Coupled. Fractional Step is available in the drop-down list when the non-iterative time advancement (NITA) scheme is enabled in the Solution Methods task page. See this section in the separate Theory Guide and Section  26.3.1 and Section  26.3.3 for details about these methods.

This item appears only when the pressure-based solver is used.

Skewness Correction   enables the SIMPLEC and PISO skewness correction for highly skewed meshes if the value (number of iterations) is greater than 0. The default value is 0 for SIMPLEC and 1 for PISO.

Neighbor Correction   enables the PISO neighbor correction, which is recommended for transient calculations, if the value (number of iterations) is greater than 0. The default value is 1.

Skewness-Neighbor Coupling   allows for a more economical but a less robust variation of the PISO algorithm.

Spatial Discretization   contains settings that control the spatial discretization of the convection terms in the solution equations. See Section  26.2 for details.

Gradient   contains a drop-down list of the options for setting the method of computing the gradient in this equation in the separate Theory Guide : Green-Gauss Cell Based; Green-Gauss Node-Based, and Least Squares Cell Based. See this section in the separate Theory Guide for details.

Pressure   (for the pressure-based solver only) contains a drop-down list of the discretization schemes available for the pressure equation: Standard, PRESTO!, Linear, Second Order, and Body Force Weighted.

This item appears only when the pressure-based solver is used.

Flow   (for the density-based solvers only) contains a drop-down list of the discretization schemes available for the pressure, momentum, and (if relevant) energy equations: First Order Upwind, Second Order Upwind, and Third-Order MUSCL.

This item appears only when one of the density-based solvers is used.

Momentum, Energy, etc.   are the names of the other convection-diffusion equations being solved. In the drop-down list next to each equation, you can select the First Order Upwind, Second Order Upwind, Power Law, QUICK, or Third-Order MUSCL discretization scheme for that equation.

If the LES turbulence model is enabled, then you have a choice of selecting Bounded Central Differencing or Central Differencing to solve the convection-diffusion equations.

If one of the density-based solvers is used, Momentum and Energy will not appear. For the density-based solvers, the discretization scheme for these equations is selected in the Flow drop-down list (described above).

Volume Fraction   is available when the VOF multiphase model is enabled. The discretization schemes that are used when solving volume fraction equations for the VOF explicit scheme are Geo-Reconstruct, CICSAM, Modified HRIC, and QUICK. The discretization schemes that are used when solving volume fraction equations for the VOF implicit scheme are First Order Upwind, Second Order Upwind, Modified HRIC, and QUICK. See this section in the separate Theory Guide for detailed information about these VOF-specific interpolation schemes.

Transient Formulation   contains options for setting different time-dependent solution formulations. This option appears only when Transient is enabled under Time in the General task page. Available options include: Explicit (available only for the Density Based Explicit solver); First Order Implicit; and Second Order Implicit. See Section  26.12 for details.

Non-iterative Time Advancement   enables non-iterative time-advancement (NITA) scheme. See this section in the separate Theory Guide for details.

Frozen Flux Formulation   enables an option to discretize the convective part of this equation in the separate Theory Guide using the mass flux at the cell faces from the previous time level n. This option is available only for a Transient solution. See this section in the separate Theory Guide for details.

Default   sets the fields to their default values, as assigned by ANSYS FLUENT.