This work is my effort to produce a text which is helpful for becoming engineers, post graduate students and IT professionals. CFD is an emerging technology which is getting matured with the advent of supercomputers. Therefore, the knowledge of CFD alone is not sufficient to compete with the ongoing challenges in this field. Many engineers are found helpless when dealing with IT matters and they wait long enough for and IT expert to solve problem. The knowledge of HPC up to a primary extent is, therefore, mandatory for engineers. Look the other way round, when IT professionals are dealing with CFD problems. They need to know the basics of the most on-going commercial codes especially their installation on Linux-based clusters, enabling efficient job scheduling and trouble shoot bottlenecks in running a simulation without a helping hand of CFD engineers. One more important aspect is that the reader should not feel a need to browse the internet for some simple matters which are tried to be explained in this book in a much easier manner.