Mechanical APDL Basic Analysis Guide - Ansys

You can opt to archive all defined surfaces, all selected surfaces or only a specified surface. When you retrieve
surface data, it becomes the currently active surface data. Any existing surface data is cleared.
The following input listings provides examples of archiving and retrieving operations.
/post1
! define spherical surface at WP origin, with a radius of 0.75 and 10 divisions per 90 degree arc
sucreate,surf1,sphere,0.75,10
wpoff,,,-2 ! offset working plane
! define a plane surface based on the intersection of working plane
! with the currently selected elements
sucreate,surf2,cplane
susel,s,surf1 ! select surface 'surf1'
sumap,psurf1,pres ! map pressure on surf1. Result set name "psurf1"
susel,all ! select all surfaces
sumap,velx,v,x ! map VX on both surfaces. Result set name "velx"
sumap,vely,v,y ! map VY on both surfaces. Result set name "vely"
sumap,velz,v,z ! map VZ on both surfaces. Result set name "velz"
supr ! global status of current surface data
supl,surf1,sxsurf1 ! contour plot result set sxsurf1
supl,all,velx,1 ! contour plot result set velx on all surfaces. Plot in context of all elements in
model
supl,surf2,vel ! vector plot of resultant velocity vector on surface "surf2"
suvect, vdotn,vel,dot,normal ! dot product of velocity vector and surface normal
! result is stored in result set "vdotn"
sueval, flowrate, vdotn, INTG ! integrate "vdotn" over area to get apdl parameter "flow rate"
susave,all,file,surf ! Store defined surfaces in a file
finish
7.2.2.6. Archiving and Retrieving Surface Data to an Array Parameter
Writing surface data to an array allows you to perform APDL operations on your result sets. You use the
SUGET command to write either the interpolated results data only (default), or the results data and the
geometry data to your defined parameter. The parameter is automatically dimensioned and filled with data.
7.2.2.7. Deleting a Surface
Use the SUDEL command to delete one or more surfaces, along with the mapped results on those surfaces.
You can choose to delete all surfaces, or choose to delete individual surfaces by name. Use the SUPR command
to review the current list of surface names.
7.2.3. Integrating Surface Results
The INTSRF command (Main Menu> General Postproc> Nodal Calcs> Surface Integrl) allows you to integrate
nodal results on a selected surface. You must first select the nodes on the surface where the nodal
results are to be integrated.
You may use INTSRF to calculate lift and drag. If the surface is a fluid-solid interface, select only the fluid
elements for integration. Then, select the nodes by using the EXT option on the NSEL command (Utility
Menu> Select> Entities).
To use INTSRF to calculate lift and drag, you must specify a results coordinate system with the X-axis and
Y-axis aligned in the direction of the incoming flow field and the direction of gravity, respectively. Then, the
drag force is the force in the X-direction and the lift is the force in the Y-direction. You use INTSRF,PRES
and INTSRF,TAUW to obtain the lift and drag forces, respectively. You can use INTSRF,FLOW to obtain both
the lift and drag forces, separately. The outcome is written to the output (Jobname.OUT).
Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
7.2.3. Integrating Surface Results
149