StarCD is a powerful industrial Computational Fluid Dynamics code compiled and sold by

Computational Dynamics Ltd

CD adapco Group

 

As most CFD codes, StarCD solves the Navier-Stokes equations for varied type of 3D-flows, and runs both the pre- and post-processing of numerical studies. Indeed, even though it is conceivable to import a grid from another meshing software (for instance, Gambit), StarCD contains its own meshing facility, which offers the possibility to create complex 3D geometries.

 

The first version of the software , StarCD 3.15, is a sequential code which works on one single process. It has its own graphic user interface, named prostar, which enables the user to set various types of characteristics (geometry, fluid properties, etc...). This version is quite user-friendly since most explanations are set in the Prostar Navigation Guide. However, either complex geometries or extremely refined grid required substantial calculation times, which limits the performances of the code.

 

Therefore, a dynamic version, named Star-HPC and based on the previous StarCD 3.15, has been compiled in 2001 by Computational Dynamics Ltd. This version shows a new specific interface, called prohpc, and give to the user the opportunity to work on several processors at the same time. Thus, calculation times are considerably reduced, and compuytations can be run on more complex grids or geometries.

 

The configuration that is going to be studied in this manual is a free surface flow (e.g. see Tutorial 15, StarCD 3.15 User Guide). The model consists of a water column collapsing under its own weight and hitting an obstacle situated a small distance downstream, as shown on figure below.

 

Click on picture to see the grid ...

 

The grid has been built as described in Tutorial 15, then refined twice in the surroundings of the obstacle. The final version of the grid has 100989 cells : using the sequential code, thus one single processor, it is obvious that the calculation time will reach several hours, and even several days.