Appears when the Common module entity in the Properties panel Time Definition is set to Transient. Select the Flow module and in the Properties panel Numerics > Time Accuracy > [Desired Method]

Default value for Time Accuracy. Determines temporal updates implicitly, based on the previous time step only.

Determines temporal updates implicitly, based on the previous two time step. The relative influence of the two previous time steps depends on the Time Blending Factor and a Blending Options (Everywhere or Boundary Only) with reference to location.

Determines temporal updates based on the previous time step alone, using a combination of an explicit or implicit formulation. The relative influence of implicit versus explicit depends on the Time Blending Factor and a Blending Options (Everywhere or Boundary Only) with reference to location.

Yes or No

When you select the Automatic Relaxation value as Yes in the Properties panel, it adds additional linear relaxation for the pressure solution in Creo Flow Analysis as follows:

Controls the amount of correction applied during each iteration, using the following formula for Pressure and Velocity corrections:

Form of relaxation applied to the diagonal of the solution matrix. It has a similar effect to the influence of an old value at a previous time step. The flow module has separate values for the velocity and pressure corrections. During the solution process, the solver provides an estimate of the amount of correction needed to obtain an accurate solution. In general, relaxation refers to this suggested correction that is applied to the next iteration.

Sets the value at a cell interface based on the value from the cell that is upwind (upstream) of the interface of interest.

Sets the value at a cell interface using an average value from the cells on both sides of the interface of interest. You can use central differencing by setting Blending Factor and Bounded Scheme to control the convergence.

Sets the value at a cell interface based on a stencil of cells neighboring the interface of interest. You can use 2nd Order Upwind with a Blending Factor and a Bounded Scheme to help control the convergence.

0.1 to 0.5

Use the blending factor and the bounded scheme to stabilize convergence. Use Blending Factor with the higher order interpolation schemes such as Central and 2nd Order Upwind. This helps to stabilize the convergence by including the Upwind scheme using the equation listed below:

Use Bounded Scheme with the higher order interpolation schemes such as Central and 2nd Order Upwind. This helps to stabilize the convergence by limiting the range of the value of the interpolation to be not more or less than the maximum or minimum (respectively) of the cells neighboring the cell-face of interest.

In the Properties panel under the Flow module, you can set Bounded Scheme for velocity of Central or 2nd Order Upwind.

No bounds are placed on the interpolation.

Bounds are placed only on the faces next to the boundaries

Bounds are applied throughout the entire domain.

AMG (Algebraic Multigrid Solver)

Default for Pressure

CGS (Conjugate Gradient Squared)

Default for Velocity

Default value is 50

The solution process in Creo Flow Analysis is iterative, including the Linear Solver. You can limit the total number of sweeps within a linear solver by setting the Sweeps to a maximum allowed value. If the solver reaches the maximum sweeps, it advances to the next variable.

Default value is 0.1

The solution process in Creo Flow Analysis is iterative, including for the Linear Solver. You can control the total number of Sweeps within a Linear Solver by setting the Linear Solver Tolerance to the desired convergence tolerance. When the correction for the solver for a given variable falls below its Linear Solver Tolerance, the solver advances to the next variable.

Semi-Implicit Method for Pressure Linked Equations. Ref. Patankar, Numerical Heat Transfer and Fluid Flow, 1980, ISBN 0-07-048740-5

A general curvilinear coordinates pressure correction scheme (SIMPLEC). Semi-Implicit Method for Pressure-Linked Equations, Consistent. Ref: Doormaal, J., and G.D.Raithby, Enhancements of the SIMPLE method for predicting incompressible fluid flows, Num. Heat Transfer 7 (1984), 147–163

A Flow Analysis proprietary extension of the SIMPLEC algorithm.

Appears when the Common module entity in the Properties panel Time Definition is set to Transient. Select the Turbulence module and in the Properties panel Numerics > Time Accuracy > [Desired Method]

Default value for Time Accuracy. Determines temporal updates implicitly, based on the previous time step only.

Determines temporal updates implicitly, based on the previous two time step. The relative influence of the two previous time steps depends on the Time Blending Factor and a Blending Options (Everywhere or. Boundary Only) with reference to location.

Determines temporal updates based on the previous time step alone, using a combination of an explicit or implicit formulation. The relative influence of implicit versus explicit depends on the Time Blending Factor and a Blending Options (Everywhere or. Boundary Only) with reference to location.

Controls the amount of correction applied during each iteration, using the following formula for Pressure and Velocity corrections:

0.3, 0.3

Form of relaxation applied to the diagonal of the solution matrix. It has a similar effect to the influence of an old value at a previous time step.

spatial interpolation

Default for both the parameters

500, 500

Number of sweeps used for a given iteration appear in the *.out file as INFO(Sim01:Turbulence): Turbulence INFO(Sim01:Turbulence:tke:CGS): Residual: 0.633601 Sweeps = 1 INFO(Sim01:Turbulence:ted:CGS): Residual: 57.816 Sweeps = 1

Residuals for turbulent kinetic energy and the turbulent energy dissipation rate appear in the *.out file as follows:

Default value is 0.1

Default value is 0.1

Yes or No

Refers to the links between diagonally connected cells in the Mesh. While potentially slowing down the calculation, these terms typically offer negligible improvement in the solution. By default, they are not used in the solution of the Turbulence module, but can be activated using the Skew Term option. In the Properties panel you can activate Skew Term for Turbulent Kinetic Energy and the Turbulent Energy Dissipation Rate solution for the Turbulence module.

Appears when the Common module entity in the Properties panel Time Definition is set to Transient. Select the Heat module and in the Properties panel Numerics > Time Accuracy > [Desired Method]

Default value for Time Accuracy. Determines temporal updates implicitly, based on the previous time step only.

Determines temporal updates implicitly, based on the previous two time step. The relative influence of the two previous time steps depends on the Time Blending Factor and a Blending Options (Everywhere or. Boundary Only) with reference to location.

Determines temporal updates based on the previous time step alone, using a combination of an explicit or implicit formulation. The relative influence of implicit versus explicit depends on the Time Blending Factor and a Blending Options (Everywhere or. Boundary Only) with reference to location.

Controls the amount of correction applied during each iteration, using the following formula for Pressure and Velocity corrections:

Formula for enthalpy “h” corrections

0.3, 0.3

Form of relaxation applied to the diagonal of the solution matrix. It has a similar effect to the influence of an old value at a previous time step.

Properties panel: Model > Numerics > Numeric Scheme > [Desired Scheme]

Defaults to the fluid phase

Applicable to the fluid phase only. In the solid phase, the Central option is used exclusively by default. If central option is selected, then the default values for Blending factor and Bounded Scheme are 0.1 and BC only respectively.

Applies to the fluid phase only.

Default for the Energy solution

Default for Sweeps is 50 for the solution of the heat equations.

Number of Sweeps used for a given iteration appear in the *.out file as follows:

Default linear solver tolerance for the energy equation is 0.1.

Residuals for the heat module appear in the *.out file as follows:

Residuals above are normalized relative to the first iteration at the start of the timestep or steady-state simulation. They are not the residual within the linear solver.

6000

0.1

50