Mechanical APDL Basic Analysis Guide - Ansys

Chapter 8:The Time-History Postprocessor (POST26)
You define the variable according to the result item in the results file. This means setting up pointers to the
result item and creating labels for the areas where this data will be stored. For example, the following
commands define time-history variables two, three and four:
NSOL,2,358,U,X,UX_at_node_358
ESOL,3,219,47,EPEL,X, Elastic_Strain
ANSOL,4,101,S,X ,Avtg_Stress_101
Variable two is a nodal result defined by the NSOL command. It is the UX displacement at node 358. Variable
three is an element result defined by the ESOL command. It is the X component of elastic strain at node 47
for element 219. Variable four is an averaged element nodal result defined by the ANSOL command. It is
the X-component of averaged element nodal stress at node 101. Any subsequent reference to these result
items will be through the reference numbers or labels assigned to them. Defining a new variable with the
same number as an existing variable overwrites the existing variable. The following commands are used to
define variables:
Commands used to define variables
ANSOL
GAPF
EDREAD
LAYERP26*
SHELL*
* Commands that define result location
ESOL
NSOL
SOLU
FORCE*
RFORCE
The second part is storing the variables (the STORE command). Storing means reading the data from the
results file into the database. In addition to the STORE command, the program stores data automatically
when you issue display commands (PLVAR and PRVAR) or time-history data operation commands (ADD,
QUOT, etc.).
An example of using the STORE command follows:
/POST26
NSOL,2,23,U,Y ! Variable 2 = UY at node 23
SHELL,TOP ! Specify top of shell results
ESOL,3,20,23,S,X ! Variable 3 = top SX at node 23 of element 20
PRVAR,2,3 ! Store and then print variables 2 and 3
SHELL,BOT ! Specify bottom of shell results
ESOL,4,20,23,S,X ! Variable 4 = bottom SX at node 23 of element 20
STORE ! By command default, place variable 4 in memory with 2 and 3
PLVAR,2,3,4 ! Plot variables 2,3,4
In some situations, you will need to explicitly request storage using the STORE command (Main Menu>
TimeHist Postpro> Store Data). These situations are explained below in the command descriptions. If you
use the STORE command after issuing the TIMERANGE command or NSTORE command (the GUI equivalent
for both commands is Main Menu> TimeHist Postpro> Settings> Data), then the default is STORE,NEW.
Otherwise, it is STORE,MERGE as listed in the command description below. This change in command default
is required since the TIMERANGE and NSTORE commands redefine time (or frequency) points and time increment
for data storage. You have the following options for storing data:
MERGE
Adds newly defined variables to previously stored variables for the time points stored in memory. This
is useful if you wish to store data using one specification (FORCE, SHELL, LAYERP26 commands) and
store data using another specification; see the example above.
NEW
Replaces previously stored variables, erases previously calculated variables, and stores newly defined
variables with current specifications.
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