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 aim of this report is to compare the performances of StarCD and Star-HPC. It is based on the tutorial 15 of the StarCD User Guide, which deals with the free surface calculation of a collapsing water column. Calculations will be made first with StarCD 3.10, then with Star-HPC using successively 2, 3, 4, 5, 6, and at last 7 processors to run the simulation.