applications/solvers/solidMechanics/deprecatedSolvers/contactStressFoam/traction.H

   1                 (
   2                     traction[patchI]
   3
   4                   - (n &
   5                     (
   6                         mu.value()*gradUpatches[patchI].T()
   7                       - (mu + lambda).value()*gradUpatches[patchI]
   8                     )
   9                     )
  10
  11                   - n*
  12                     (
  13                         lambda.value()*tr(gradUpatches[patchI])
  14
  15                     )
  16
  17                 )/(2.0*mu + lambda).value();