Specifies that surface loads are to be accumulated.

Compatible Products: – | Pro | Premium | Enterprise | Ent PP | Ent Solver | –


Valid surface load label. If ALL, use all appropriate labels.

DisciplineSurface Load LabelLabel Description
 HFLUX[1]heat flux
SubstructureSELVload vector number
ElectricCHRGSsurface charge density
 MXWFMaxwell force flag
MagneticMXWFMaxwell force flag
Infinite elementINFExterior surface flag for INFIN110 and INFIN111
DiffusionDFLUXDiffusion flux
  1. Thermal labels CONV and HFLUX are mutually exclusive.


Accumulation key:



Subsequent values replace the previous values (default).



Subsequent values are added to the previous values.



Subsequent values are ignored.


Scale factor for the first surface load value. A (blank) or '0' entry defaults to 1.0.


Scale factor for the second surface load value. A (blank) or '0' entry defaults to 1.0.

Command Default

Replace previous values.


Allows repeated surface loads (pressure, convection, etc.) to be replaced, added, or ignored. Surface loads are applied with the SF, SFE, and SFBEAM commands. Issue the SFELIST command to list the surface loads. The operations occur when the next surface load specifications are defined. For example, issuing the SF command with a pressure value of 25 after a previous SF command with a pressure value of 20 causes the current value of that pressure to be 45 with the add operation, 25 with the replace operation, or 20 with the ignore operation. All new pressures applied with SF after the ignore operation will be ignored, even if no current pressure exists on that surface.

Scale factors are also available to multiply the next value before the add or replace operation. A scale factor of 2.0 with the previous "add" example results in a pressure of 70. Scale factors are applied even if no previous values exist. Issue SFCUM,STAT to show the current label, operation, and scale factors. Solid model boundary conditions are not affected by this command, but boundary conditions on the FE model are affected.

Note:  The FE boundary conditions may still be overwritten by existing solid model boundary conditions if a subsequent boundary condition transfer occurs.

SFCUM does not work for tabular boundary conditions.

This command is also valid in PREP7.

Menu Paths

Main Menu>Preprocessor>Loads>Define Loads>Settings>Replace vs Add>Surface Loads
Main Menu>Solution>Define Loads>Settings>Replace vs Add>Surface Loads

Release 18.2 - © ANSYS, Inc. All rights reserved.