 
 
 
 
 
 
 
  
Properties: adiabatic, not isentropic, directional, inlet based restrictor if
 and outlet based restrictor if
 and outlet based restrictor if  .
.
A user-defined restrictor is described by the following constants (to be specified in that order on the line beneath the *FLUID SECTION, TYPE=RESTRICTOR USER card):
 .
.
 .
.
 defined by
 defined by  where
 where  is the area
  of the smallest cross section and
 is the area
  of the smallest cross section and  is the
  perimeter of the smallest cross section.
 is the
  perimeter of the smallest cross section. 
 .
.
By specifying the parameter LIQUID on the *FLUID SECTION card the loss is calculated for liquids. In the absence of this parameter, compressible losses are calculated.
Example files: restrictor, restrictor-oil.