Gtheta computation

Gtheta Computations using UDF

UDF was created to extract the post processing result from individual cell of the model.

There are three methods in calculation the Gtheta values.

The first method is to extract the individual G and theta values from the cell and sum up all the cells to obtain the total Gtheta. The total Gtheta is then divided by the total cells to get the average Gtheta.

   ∑(G_cell*Ө_cell)/N            (1)

The second method was to extract individual G value and take the average of the G value. The theta is calculated by volume divided by inlet flow rate. 

   Ө_floc = Vol./(Vol. flow rate)
   ∑(G_cell)/N* Ө_floc          (2)

The third method is multiple the sum of the G-value and the sum of the theta value and divide by the number of cells.

    ∑(G_cell)/N* ∑(Ө_floc)/N             (3)

Gtheta was also plotted using the custom function in FLUENT.

   GӨ = [ε/υ]^1/2 * [Vol. flow rate_cell/Cell Volume]       (4)