[jomunkas]

Hi,


Do you know a book or paper which describes the following lines?

for (iDim = 0; iDim < nDim; iDim++) {
  TauElem[iDim] = 0.0;
  for (jDim = 0; jDim < nDim; jDim++) {
    TauElem[iDim] += Tau[iDim][jDim]*UnitNormal[jDim];
  }
}

/*--- Compute wall shear stress (using the stress tensor). Compute wall skin friction coefficient, and heat flux on the wall ---*/

TauNormal = 0.0; for (iDim = 0; iDim < nDim; iDim++) TauNormal += TauElem[iDim] * UnitNormal[iDim];

WallShearStress = 0.0;
for (iDim = 0; iDim < nDim; iDim++) {
  TauTangent[iDim] = TauElem[iDim] - TauNormal * UnitNormal[iDim];
  CSkinFriction[iMarker][iDim][iVertex] = TauTangent[iDim] / (0.5*RefDensity*RefVel2);
  WallShearStress += TauTangent[iDim] * TauTangent[iDim];
}
 WallShearStress = sqrt(WallShearStress);

I would like to calculate the drag and lift coefficients on my own using the
CSkinFriction and Pressure_Coefficient. But I have some trouble to find the right equation to do so. Do you know some document where it is described?


Kind regards,
Peter