Mechanical APDL Basic Analysis Guide - Ansys

APPEND
Appends data to previously stored variables. That is, if you think of each variable as a column of data,
the APPEND option adds rows to each column. This is useful when you want to "concatenate" the same
variable from two files, such as in a transient analysis with results on two separate files. Use the FILE
command (Main Menu> TimeHist Postpro> Settings> File) to specify result file names.
ALLOC,N
Allocates space for N points (N rows) for a subsequent storage operation. Previously stored variables, if
any, are zeroed. You normally do not need this option, because the program determines the number of
points required automatically from the results file.
Notes:
• By default, batch mode allows you to define up to ten variables. Use the NUMVAR command to increase
the number of variables up to the available 200.
• Time or Frequency will always be variable 1
• By default, the force (or moment) values represent the total forces (sum of the static, damping, and inertial
components). The FORCE command allows you to work with the individual components.
Note
The FORCE command only affects the output of element nodal forces.
• By default, results data for shell elements and layered elements are assumed to be at the top surface
of the shell or layer. The SHELL command allows you to specify the top, middle or bottom surface. For
layered elements, use the LAYERP26 and SHELL commands to indicate layer number and surface location,
respectively.
• Other commands useful when defining variables are:
– NSTORE - defines the number of time points or frequency points to be stored.
– TIMERANGE - defines the time or frequency range in which data are to be stored.
– TVAR - changes the meaning of variable 1 from time to cumulative iteration number.
– VARNAM - assigns a name (32 character max.) to a variable.
– RESET - removes all variables and resets all specifications to initial defaults.
8.4. Processing Your Variables to Develop Calculated Data
Often, the specific analysis data you obtain in your results file can be processed to yield additional variable
sets that provide valuable information. For example, by defining a displacement variable in a transient analysis,
you can calculate the velocity and acceleration by taking derivatives with respect to time. Doing so
will yield an entirely new variable that you may wish to analyze in conjunction with your other analysis data.
8.4.1. Interactive
The variable viewer provides an intuitive calculator interface for performing calculations. All of the command
capability can be accessed from the calculator area. The calculator can be displayed or hidden by clicking
on the bar above the calculator area.
Follow these steps to process your time history data using the variable viewer:
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8.4.1. Interactive
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