Why is turbulence so important?

Turbulence is most important because it commonly occurs in most of the natural and man-made flows. A turbulent flow has significantly different properties than a laminar flow, such as increased fluid mixing, enhanced surface heating, more drag , loss of lift etc.

What is turbulence Modelling write the basics about it?

Turbulence modeling is the construction and use of a mathematical model to predict the effects of turbulence. Turbulent flows are commonplace in most real life scenarios, including the flow of blood through the cardiovascular system, the airflow over an aircraft wing, the re-entry of space vehicles, besides others.

What turbulence model should I use?

The Reynolds Stress Model is the most complete turbulence model with regards to representing turbulent flow.

What are different turbulence models?

The COMSOL Multiphysics® software offers several different formulations for solving turbulent flow problems: the L-VEL, algebraic yPlus, Spalart-Allmaras, k-ε, k-ω, low Reynolds number k-ε, SST, and v2-f turbulence models.

What are the benefits of turbulent flows?

A turbulent flow can be either an advantage or disadvantage. A turbulent flow increases the amount of air resistance and noise; however, a turbulent flow also accelerates heat conduction and thermal mixing. Therefore, understanding, handling, and controlling turbulent flows can be crucial for successful product design.

Why is turbulence a mystery?

Turbulence is an unsolved problem because its random in nature but also correlated. The exact motion of a fluid particle is chaotic and highly dependent on initial disturbance. One can solve turbulence using statistical approach only , as a combination of a mean and a fluctuating motion.

What does turbulent flow look like?

In turbulent flow the speed of the fluid at a point is continuously undergoing changes in both magnitude and direction. The flow of wind and rivers is generally turbulent in this sense, even if the currents are gentle. The air or water swirls and eddies while its overall bulk moves along a specific direction.

Why is k-epsilon a turbulence model?

The k-epsilon (k-\epsilon) model for turbulence is the most common to simulate the mean flow characteristics for turbulent flow conditions. It belongs to the Reynolds-averaged Navier Stokes (RANS) family of turbulence models where all the effects of turbulence are modeled. It is a two-equation model.

What is complete turbulence?

A fully turbulent region comprising the bulk of the fluid stream where momentum transfer is attributable virtually entirely to random eddies and the effects of viscosity are negligible.

Which turbulence model is used for CFX?

The best turbulence model for simulate in ANSYS is k- w SST ( SST in CFX) which is give you a nears results to experiment especially for your case .