These are the most common CFD usage requirements from clients:  

CFD can be applied to a wide range of products: every object working in a fluid environment (e.g. air, water, etc.) could be potentially affected by fluid-dynamic forces. A correct estimation of these contributes to the product validation and enhancement.

CFD approach allows multi-parameter optimisation of 3D geometry resulting from the preliminary design. Revised geometries are either re-defined in CAD, based on simulation results, and re-meshed or, in some cases, the revised computational mesh is obtained directly by means of quicker mesh morphing techniques.

Compared to other fluid dynamics analysis tools, the extensive characterisation of the flow is a unique property of CFD simulation. Since flow properties are available across the entire fluid flow sector, understanding the behaviour of aerodynamic devices is quicker and easier.