_RL sideMaskFac
sideMaskFac = sideDragFactor
sideMaskFac = 0. _d 0
vort3(i,j) = sideMaskFac*vort3(i,j)
strain(i,j) = sideMaskFac*strain(i,j)
vort3BC(i,j) = sideMaskFac*vort3BC(i,j)
strainBC(i,j) = sideMaskFac*strainBC(i,j)