Card 9 - ADDREMOVE Additional or Removal Criteria Definition

This optional card specifies the criteria for adding or removing elements during a simulation.

Parameters: KODE, N1, T1, T2

KODE

KODE is the code ADDREMOVE (or 120)

N1

N1 is the element number or group name to which additional or removal criteria is applied.

T1 = NAME

T1 = NAME (or 1) specifies the name of the ADDREMOVE card. T2 is a name string.

T1 = SELECTION

T1 = SELECTION (or 2) specifies the selection of elements to which the additional or removal criteria is applied. T2 is a group name or an element number.

T1 = CRITERION

T1 = CRITERION (or 3) specifies the addition time when the solver adds or removes the physical properties of elements. Time is specified in T2. Time must be inside the range of solution time.

T1 = ADDITION_CRITERION

T1 = ADDITION_CRITERION (or 4) specifies the value of addition time when the solver adds the physical properties of elements. The value is specified in T2.

T1 = ADDITION_DELTA_TYPE

T1 = ADDITION_DELTA_TYPE (or 5) specifies the process type of the elements addition. T2 may be:

  • T2 = RAMP specifies a linear addition of the physical properties of the elements until the end of a current solution step.
  • T2 = SPECIFY specifies the period of time which user defined for addition of the physical properties of the elements.

T1 = ADDITION_DELTA_TIME

T1 = ADDITION_DELTA_TIME (or 6) specifies the time interval to add the physical properties of the elements. The value is specified in T2. If the value of delta time is greater than the time remaining in the solution step, then the solver computes the ADDITION_DELTA_TIME as the solution step time minus the current time. The solver takes the delta time as the remaining time to the next solution step.

T1 = REMOVAL_CRITERION

T1 = REMOVAL_CRITERION (or 7) specifies the value of time when the solver removes the physical properties of elements. The value is specified in T2.

T1 = REMOVAL_DELTA_TYPE

T1 = REMOVAL_DELTA_TYPE (or 8) specifies the process type of the elements removal.

  • T2 = RAMP: Specifies a linear removal of the physical properties of the elements until the end of a current solution step.
  • T2 = SPECIFY: Specifies the period of time which user defined for removal of the physical properties of the elements. The time value must be less than the remaining time in the current solution step.

T1 = REMOVAL_DELTA_TIME

T1 = REMOVAL_DELTA_TIME (or 9) specifies a time interval to remove the physical properties of the elements. The value is specified in T2.

Code example


 $ Case2                                                                        
 NAME2 Case2 Case2
 NAME Case2            8          8          1
 ADDREMOVE 2 NAME "Case2"
 ADDREMOVE 2 SELECTION "Case2"
 ADDREMOVE 2 CRITERION TIMET1 = REMOVAL_DELTA_TYPE
 ADDREMOVE 2 ADDITION_CRITERION  5.000000E+00
 ADDREMOVE 2 ADDITION_DELTA_TYPE SPECIFY
 ADDREMOVE 2 ADDITION_DELTA_TIME  9.000000E+00

Notes

Any selected element is added or removed as specified in the boundary condition. The addition criteria and the removal criteria time can be specified together. The removal time must be greater than the addition time plus the addition delta time. The addition time can be greater than the start time of the solution. This implies that the element is not added from the start of the solution until the addition time.