TIC

Bulk Data Entry

TIC – Transient and Explicit Analysis Initial Condition

Description

Defines values for the initial conditions of variables used in structural transient analysis and explicit analysis. Both displacement and velocity values may be specified at independent degrees-of-freedom.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
TIC	SID	G	C	U0	V0

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
TIC	100	10	3	0.1	0.5

Field	Contents
SID	Set identification number. (Integer > 0)
G	Grid or scalar point identification number. See comment 4. (Integer > 0)
C	Component numbers. (Any one of the integers 1 through 6 for grid points, integer zero or blank for scalar points)
U0	Initial displacement. Not applicable in geometric nonlinear analysis. (Real or blank)
V0	Initial velocity. (Real or blank)

Comments

1.	Transient analysis initial condition sets must be selected with the IC subcase information command.

2.	If a TIC set is not selected in the Subcase Information section, all initial conditions are assumed to be zero.

3.	Initial conditions for coordinates not specified on TIC entries will be assumed to be zero.

4.	In direct transient analysis, wherein the TIC bulk data entry is selected by an IC subcase information command, G may reference only grid or scalar points.

5.	Initial displacement definition is not applicable in explicit analysis. If U0 is defined, a fatal error message will be issued.

6.	The initial conditions for the independent degrees-of-freedom specified by this bulk data entry are distinct from, and may be used in conjunction with, the initial conditions for the enforced degrees-of-freedom specified by NLOAD1, TLOAD1 and/or TLOAD2 bulk data entries.

When the SPSYNTAX setting on the SYSSETTING I/O option is set to CHECK (default) or STRICT, it is required for grid/component pairs (G#/C#) that the component be 0 or blank when the grid reference is a scalar point (SPOINT), and that the component be > 1 when the grid reference is a structural grid point (GRID). When SPSYNTAX is set to MIXED, it is allowed for grid/component pairs (G#/C#) that the grid reference be either a scalar point (SPOINT) or a structural grid point (GRID) when the component is 0, 1 or blank; interpreting all of these as 0 for scalar points and as 1 for structural grids. When the component is greater than 1, the grid reference must always be a structural grid (GRID).

Each degree-of-freedom (grid/component pair: G#/C#) should define a unique value for U0 and/or V0 within any TIC ID set, but U0 and V0 may be specified on separate TIC cards. When multiple cards with the same degree-of-freedom are present, only non-zero values for U0 and V0 are used by the solver. When two non-zero values are defined for U0 or for V0 for the same degree-of-freedom, a fatal error message will be issued, even if values match.

9.	This card is represented as a constraint load in HyperMesh.