Mechanical APDL Basic Analysis Guide - Ansys

Chapter 2: Loading
⎡400.
0⎤
⎢
ABC = ⎢
587. 2
⎥
⎥
⎢965.
6⎥
⎢ ⎥
⎣⎢
740. 0⎦⎥
Assuming that these are heat flux values, you would apply them as follows:
*DIM,ABC,ARRAY,4 ! Declares dimensions of array parameter ABC
ABC(1)=400,587.2,965.6,740 ! Defines values for ABC
SFFUN,HFLUX,ABC(1) ! ABC to be used as heat flux function
SF,ALL,HFLUX,100 ! Heat flux of 100 on all selected nodes,
! 100 + ABC(i) at node i.
See the Command Reference for a discussion of the *DIM, SFFUN, and SF commands.
The SF command in the example above specifies a heat flux of 100 on all selected nodes. If nodes 1 through
4 are part of the selected set, those nodes are assigned heat fluxes of 100 + ABC(i): 100 + 400 = 500 at node
1, 100 + 587.2 = 687.2 at node 2, and so on.
Note
What you specify with the SFFUN command stays active for all subsequent SF and SFE commands.
To remove the specification, simply use SFFUN without any arguments.
2.5.7.3. Specifying a Gradient Slope
You can use either of the following to specify that a gradient (slope) is to be used for subsequently applied
surface loads:
Command(s): SFGRAD
GUI: Main Menu> Preprocessor> Loads> Define Loads> Settings> For Surface Ld> Gradient
Main Menu> Solution> Define Loads> Settings> For Surface Ld> Gradient
You can also use this command to apply a linearly varying surface load, such as hydrostatic pressure on a
structure immersed in water.
To create the gradient specification, you specify the type of load to be controlled (the Lab argument), the
coordinate system and coordinate direction the slope is defined in (SLKCN and Sldir, respectively), the
coordinate location where the value of the load (as specified on a subsequent surface load command) will
be in effect (SLZER), and the slope (SLOPE).
For example, the hydrostatic pressure (Lab = PRES) shown in Figure 2.9 (p. 37) is to be applied. Its slope
can be specified in the global Cartesian system (SLKCN = 0) in the Y direction (Sldir = Y). The pressure
(to be specified as 500 on a subsequent SF command) is to have its as-specified value (500) at Y = 0 (SLZER
= 0), and will decrease by 25 units per length in the positive Y direction (SLOPE = -25).
36
Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.