# Advanced Settings for Fill/Pack Solver

This is a list of the advanced solver settings for the Fill/Pack analysis.

Advanced solver settings for the Fill/Pack analyses are available with SOLIDWORKS Plastics Professional and SOLIDWORKS Plastics Premium.

To open the advanced solver settings:

- In the Fill Settings PlasticsManager, expand Solver Settings, and click Options.

Solver Setting | Analysis Procedure | Description |
---|---|---|

Quick-Fill Calculation | Shell | Activates linearization of the non-Newtonian (nonlinear) viscosity to speed the computation. The software activates this option by default. |

Solver Type | Shell/Solid | Specifies the solver method. Algebraic Multigrid (AMG) (default) or Pre-Conditioned Conjugate Gradient (PCG-AMG) iterative solver methods. |

Pressure/flow-rate relative error tolerance (1.E-4 ~ 1.E-2) | Shell | Available when the Quick Fill calculation option is cleared.
Determines
the convergence from an error tolerance based on a
nondimensional L1 norm of the change in either pressure or flow rate at
each element or face. and are the element or face values at iteration nanosecond and n-1 respectively. Default: 0.005 |

Pressure/flow-rate iterative relaxation factor (0.1 ~ 0.5) | Shell | Available when the Quick Fill calculation option is cleared. Defines
the under-relaxation factor for either the pressure or flow rate. This
value must be in the range of 0.1 to 0.5. Default: 0.4 |

Maximum number of nonlinear iterations (40 ~ 100) | Shell | Available when the Quick Fill calculation option is cleared. Defines the maximum number of iterations for solving the pressure or flow rate. Default: 40. If you exceed this value, the Fill/Pack analysis uses the results of the last iteration as the reference value. |

Maximum number of thickness layers (10 ~ 16) | Shell | Specifies the number of virtual layers in the thickness direction to account for in the finite difference solution of the temperature profile. Default: 40. |

Short Shot (Factor of initial flow rate) | Shell/Solid |
Specifies the limits at which a warning message alerts you that a short shot might have occurred. For pressure control, the software triggers a warning message if the ratio of the current melt front flow rate over the initial injection flow is less than this value. For flow rate control, the software triggers a warning message if the injection pressure exceeds the maximum pressure of the machine, and the control type switches to pressure control. The flow rate is likely to drop rapidly after the switch to pressure control. Default: 0.01 |

Pressure/Velocity residual error criteria (1.E-4 ~ 1.E-2) | Solid | Specifies the residual error criterion that determines convergence of
the pressure and velocity fields. The residual error
is
defined as the normalized sum of the mass imbalances
over all the elements. Reducing this number increases the conservation
properties of the solution (better accuracy) but at a greater
computational cost. Default: 0.001 |

Velocity field relaxation factor (0.1 ~ 1.0) | Solid | Specifies the under-relaxation factor for the segregated solution of
the momentum equations during the Fill/Pack phase. Increasing this
under-relaxation factor typically results in a faster fill solution, but
at the risk of reducing stability. The suggested range is between 0.5
and 0.9. Default: 0.8 |

Pressure correction relaxation factor (0.05 ~ 0.8) | Solid | Specifies the under-relaxation factor for the solution of the pressure
field during the Fill/Pack phase. Increasing the under-relaxation factor
results in a faster fill solution, but at the risk of reducing
stability. The suggested range is between 0.1 and 0.5. In general, the
solver reaches optimal convergence when the sum of the velocity field
and pressure relaxation factors is approximately one. Default: 0.8 |

P/V field Maximum Iteration Number (40 ~ 100) | Solid | Maximum iteration number for solving Pressure/Velocity. In this case,
the solver uses the results of the last iteration as the reference value
during the Fill/Pack phase. Default: 80 |

Time acceleration factor during filling process (0.1 ~ 10) | Solid |
Controls the transient time-stepping scheme used by the Fill computation process. A smaller value yields a more accurate solution at greater computational cost. A larger value yields a faster, but less accurate solution. Default: 2 |

Cell volume filled index during filling process (0.25 ~ 1.0) | Solid |
Specifies the threshold at which the software considers the cell volume as filled. Once the fraction of the cell volume that is filled exceeds this threshold, during the Fill/Pack phase, the software treats the cell as fully filled. A smaller value for this index reduces the required number of time steps for the computation, and hence accelerates the computation. However, reducing this value too much decreases the accuracy of the computational results. Default: 0.75 |

Fiber interaction coefficient (0.0001 ~ 0.01) | Shell/Solid | This option is active during the Fill/Pack analysis, when the option
for fiber orientation calculation is active. Generally, this value depends on the resin material and fiber blending percentage, and is based on physical measurements. The solver ignores the value you specify here, and uses a fixed value of 0.0005 for the calculations. |

Finite volume solver | Solid | The Segregated solver reduces memory requirements, but requires more iterations during the solution process. You must also specify proper under-relaxation parameters to avoid divergence. The Coupled solver does not require under-relaxation parameters during the solution process, and it needs very few iterations for convergence. However, it requires much more memory and much more CPU time per iteration than the Segregated Solver. The Segregated solver is the default option. |

Mold temperature profile from Cool | Solid | Selects the mold temperature profile from the Cool analysis to use during the Fill/Pack analysis. Select the Cycle average mold-wall temperature to fix the local area mold-wall temperature. Select the Transient mold-wall temperature to allow the wall temperature to vary in time. The Transient mold-wall temperature profile results in higher accuracy but requires more memory. The Transient mold-wall temperature profile is the default option. |

Volume of Fluid (VoF) algorithm (1: Direct, 2: Indirect, 3: CICSAM) | Solid | Specifies the interface reconstruction method used during the Fill/Pack phase. The Direct method solves the kinematics equation to track the fraction of volume over the whole domain. The Indirect method updates the fraction of semifilled cells from nearby filled cells, using a method similar to the one used with the Shell control volume analysis procedure. It applies only to the filled domain. The CICSAM method uses a time-integration algorithm of the kinematics equation to track the volume of fraction over the filled domain. The CICSAM method is the default option. |

Weld line face angle (90 ~ 150) | Shell/Solid | Used for weld-line computation during the Fill/Pack analysis. This option determines when weld lines begin to form. The software determines that a weld line develops when the angle between two near facets of a melt front is less than this specified value (in degrees). |

Local profile resolution[X-Y Plot](1 ~ 3) | Shell/Solid | Used during the Pack and Cool analysis. Specifies the resolution of output data for pressure and temperature histories in each local area. A higher resolution value produces more temporal data. |

Core Material Tracking Algorithm(1: Implicit, 2: Explicit) | Solid |
Specifies the front tracking algorithm for the second material (core material) during the Fill/Pack analysis of co-injection. The Implicit method directly solves the kinematics equation to track the fraction of volume of the second material. The Explicit method calculates the fill time of all semifilled cells. The cell with the minimum fill time determines the time-step increment. The Implicit method is the default option. |

Compressibility in Filling Stage(1: Yes, 0: No) | Solid | In general, the software takes into account the compressibility effects during the filling stage. Setting this option to No causes the solver to ignore any transient density changes when solving the mass conservation (continuity) equation, but retains the density variation when solving other conservation equations such as those for momentum or energy. Setting this option to No results in faster convergence, but at the expense of accuracy, potentially causing the calculated pressures to be artificially high. |

Mucell integral method of mass transfer equation | Solid |
Specifies the integral method for solving the mass-transfer flux equation during the Fill/Pack analysis for the Microcellular injection process. Three methods are available: Payvar (default method), Han and Yoo, and Shaft. |

**Parent topic**Fill-Pack Parameters PropertyManager