Each year all over the globe, from infants to adults millions of patients are diagnosed with heart failure. Heart related diseases are increasing at a fast pace around the world but the limited number of donor's hearts are available. These results in the high demand for Mechanical Circulatory Support System (MCSS).There are two different options that may be an Artificial Heart or a ventricular assist device (VAD). This Thesis takes the advantages of axial flow pumps to design a VAD and to conduct a numerous case studies on the different shapes and sizes. The CFD based design study has been done to examine the outputs of the needy parameters primarily the mass flow rate, pressure rise for the scope of the independent parameter that is a rotating speed of VAD.