## Flow analysis

Flow analysis is a fascinating field in flow mechanics, exposing the flow regimes in space, explaining small-scale flow phenomena as well as large flow systems.

The flow analysis can be divided into two types: flow inside a structure such as water or air piping, and flow over a structure such as around an airplane wing or other structure. Flow analysis makes it possible to reveal the effects of abrasion, vibration, equitation, pressure, temperature, momentum and almost any physical phenomenon in a flow, with the size of the space, the size of the transitions, the flow velocity and other characteristics defining the test areas and accuracy.

Flow analysis solutions relate to the field of nonlinear equations: complex equations that can be solved by numerical analysis, where each vertex element in the network that represents the issue is characterized by the flow equations, temperature, pressure, etc. so that the number of equations required is enormous. It is close to the three magnitudes for each cell in the network, where the size of a single cell in the network depends on the degree of accuracy required in accordance with the size of the phenomenon that needs to be examined.

A numerical solution for flow analysis is done by defining two types of flow regimes for a miniature flow regime and a turbulent flow regime. Laminar flow is defined as a layered flow so that the flow layers flow on top of each other. Turbulent flow is a state of mixing between the layers and the calculation is the average of the layers. The flow regime is defined using a Reynolds number (dimensionless value), which defines whether the flow type is laminar or turbulent.

Between laminar and turbulent flow is a transition area where laminar flow and turbulent flow take place, in a cyclical pattern, with the dominant flow flowing in the laminar and in the friction areas (sides), a dominant turbulent flow.

Most often, the flow problems are subsonic, meaning the speed of progress in the flow medium is lower than the speed of the sound made by the flow, but there are cases where the speed of progress in the flow is higher than the speed of sound. These cases require a different approach to the problem with appropriate flow equations with characteristics such as Mach number, pressure waves, and thermal phenomena on the structure and in their flow.