applications/solvers/solidMechanics/elasticAcpSolidFoam/aitkenRelaxation.H

   1 // aitken acceleration
   2 aitkenDelta.storePrevIter();
   3
   4 // update delta
   5 aitkenDelta = (U - U.prevIter()) / aitkenInitialRes;
   6
   7 // update relaxation factor
   8 if(iCorr == 0)
   9   {
  10     aitkenTheta = 0.1;
  11   }
  12  else
  13    {
  14      vectorField b = aitkenDelta.internalField() - aitkenDelta.prevIter().internalField();
  15      //scalar sumMagB = gSum(mag(b));
  16      scalar sumMagB = gSum(magSqr(b));
  17      if(sumMagB < SMALL)
  18        {
  19          //Warning << "Aitken under-relaxation: denominator less then SMALL"
  20          //      << endl;
  21          sumMagB += SMALL;
  22        }
  23
  24      aitkenTheta = -aitkenTheta*
  25        gSum(aitkenDelta.prevIter().internalField() & b)
  26        /
  27        sumMagB;
  28    }
  29
  30 // correction to the latest U
  31 U += aitkenTheta*aitkenDelta*aitkenInitialRes;