ansys.mapdl.core.Mapdl.prrfor#

Mapdl.prrfor(lab='', **kwargs)#

Prints the constrained node reaction solution. Used with the force command.

Mechanical APDL Command: PRRFOR

Parameters:
labstr

Nodal reaction load type. If blank, use the first ten of all available labels. Valid labels are:

  • Structural force labels : FX, FY or FZ (forces); F (FX, FY and FZ); MX, MY or MZ (moments); M (MX, MY and MZ).

  • Thermal force labels : HEAT, HBOT, HE2, HE3,…, HTOP (heat flow).

  • Fluid force labels : FLOW (fluid flow); VFX, VFY and VFZ (fluid forces); VF (VFX, VFY and VFZ).

  • Electric force labels : AMPS (current flow); CHRG (charge); CURT (current); VLTG (voltage drop).

  • Magnetic force labels : FLUX (magnetic flux); CSGZ (magnetic current segment); CURT (current), VLTG (voltage drop).

  • Diffusion labels : RATE (diffusion flow rate).

Notes

prrfor has the same functionality as the prrsol command; use prrfor instead of prrsol when a force command has been issued.

In a non-spectrum analysis, if either contact or pretension elements exist in the model, prrfor uses the prrsol command internally and the force setting is ignored.

Because modal displacements cannot be used to calculate contact element nodal forces, those forces are not included in the spectrum and PSD analyses reaction solution. As a consequence, the prrfor command is not supported when constraints on contact element pilot nodes are present.

prrfor is not valid when using the amplitude or phase results set ( KIMG = AMPL or PHAS on the Set displays command). Use prrsol instead.

Using PRRFOR in a Spectrum or PSD Analysis ( ANTYPE,SPECTR) When using prrfor in a spectrum analysis (after the combination file has been input through input,,MCOM and when spopt has not been issued with Elcalc = YES during the spectrum analysis), or in a PSD analysis when postprocessing 1-sigma results (loadstep 3, 4, or 5), the following message will display in the printout header:

(Spectrum analysis summation is used)

This message means that the summation of the element nodal forces is performed prior to the combination of those forces. In this case, rsys does not apply, and the reaction forces are in the nodal coordinate systems. Unlike prrsol, which retrieves the forces from the database, the prrfor command calculates the forces in the postprocessor.

The spectrum analysis summation is available when the element results are written to the mode file, Jobname.mode ( MSUPkey = Yes on mxpand ).

The spectrum analysis summation is not available after reading a load case ( lcwrite, lczero, lcase ).