plotting volume fraction
 

hi

Ive simulated oil-water flow in horizontal pipe with steady and unsteady state both.iam trying to plot the phase volume fraction in a plane.i have set the volume fraction of oil as 0.2..the thing is iam not able to view in the plane where the volume fraction of oil is zero.i tried with auto scale and set the values from 0 to 0.2.but still i cannot see the contours with void fractions.it is not possible that in the plane there is no place where oil is not present.can anyone help me how to adjust the settings or iam wrong somewhere.

regards Falak