and full when F is greater than 1 - eF, where sF is
typically 10m6.If, after advection, a cell has an F value less than E,, this F is set to
zero and all neighboring full cells become surface cells by having their F values
reduced from unity by an amount 1.Is,. These changes in F are also included in the
accumulated volume change. Volume errors after hundreds of cycles are typically
observed to be a fraction of a per cent of the total fluid volume.