The relation between capillary pressure head and volumetric fluid content is of widespread interest for modeling multiphase fluid flow in porous media. The use of a pressure cell, yet a very common experimental procedure to determine this relation, can yield results which do not represent the behavior of the porous medium at a physical point (Dane et al., 1992). A computational procedure and a fortran program designed to overcome inaccuracies in the use of a pressure cell were presented by Liu and Dane (1995). Their approach permits to obtain the parameters of the widely used Brooks-Corey relationship at a physical point, using pressure cell data. TrueCell is a Windows based interface for computation of the Brooks-Corey parameters at a physical point, using pressure cell data. It uses the Fortran program created by H.H. Liu in 1995 (BCP.for). TrueCell permits easy handling of pressure cell data and quick visualization and printing of the true Brooks-Corey fitted curve at a physical point.

Download TrueCell version 1.2 installation package

View installation notes

TrueCell 1.2 User's Guide (346KB, pdf format, Acrobat Reader 3.0 required)
 

Having problems running TrueCell?

To avoid problems when running TrueCell it is important not to download the software package to a folder with a name of more than one word, such as Program Files, but first create a new folder with only one name such at WinProg.

 When running consecutive data sets it is best to exit TrueCell before the next data set is entered. This is only desirable when the next data set contains more lines than the previous data set. If this procedure is not followed, the correct results will still be obtained, but the working input file may show more lines than entered. The graphics and the listed output file will, however, be correct.

 Upon clicking on the "Open TrueCell Input File", data can be entered from some other location by specifying the file, or data can be entered manually into the first window. When going to the next window and using the button "save input file" the input file must be stored in the TrueCell directory as a tci file (use file name with .tci extension). After execution of the program the output file can be moved to another location and renamed.

 In case TrueCell is still giving you problems, you may want to use the original Fortran code developed by H.H. Liu.

Fortran code BCP user's guide (800KB, pdf format)

Fortran code BCP package (zip file)
 

Available literature:
Liu, H.H. and J.H. Dane. 1995. Improved computational procedure for retention relations of immiscible fluids using pressure cells.  Soil Sci. Soc. Am. J. 59:1520-1524. Article (pdf format)
Liu, H.H. and J.H. Dane. 1995. Computation of the Brooks-Corey parameters at a physical point based on pressure cell data. Alabama Agricultural Experiment Station, Auburn University, Auburn, AL. Paper (pdf format)
Jalbert, M., J.H. Dane and H.H. Liu. 1999. TrueCell, physical point Brooks-Corey parameters using pressure cell data, user's guide for version 1.2. Alabama Agricultural Experiment Station, Auburn University, Auburn, AL. Paper (pdf format)