computing the percentage of area of a surface above or below some specified value
client is interested to calculate the percent area of a surface (usually a flat crosssection of a model) that has a value at or above (or at or below) a given value. For example, to look at flow distribution into a burner, on the crosssection of the duct upstream of the burner, he/she would like to know the percentage of the flow area that has a velocity 25% above the average duct velocity. Following procedure can be used: 1. Calculate the area of the actual surface (e.g. surface1) using Report>Surface Integral>Area 2. Use Surface> Iso Clip option to clip the surface1 based on the desired range of the values. Select appropriate minimum and maximum values of the variables ( e.g., velocity, temp etc) and clip the NewSurface. 3. Compute the area of the Newsurface which should give the percentage of area having some desired values. 

