Laminar and Turbulent Jets Using Ansys Fluent

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In many industrial applications, such as combustors and mixers, the flow introduced into the flow domain is in the form of a jet. A jet, which is a type of free shear flow, is exhaust from a confined source such as a nozzle into the quiescent surrounding. It is generally a stream of flowing fluid that mixes with the surrounding quiescent fluid that is generally at rest. Depending on the cross-section of the exhaust, these jet flows can be planar or round. From an engineering standpoint, the jet centerline velocity, spreading rate, and penetration length are the parameters of interest. Based on the flow properties, jet flows can be laminar or turbulent. Nozzles are designed for maximum efficiency under certain flow conditions by studying these flow behaviors. This can be achieved using computational fluid dynamics (CFD).

In this course, we consider a canonical problem of 2D axisymmetric jet flow to compare laminar and turbulent flow behavior. This SimCafe course was developed by Dr. Rajesh Bhaskaran, Swanson Director of Engineering Simulation at Cornell University, and Lara Camille Backer in partnership with Ansys. It serves as an e-learning resource to integrate industry-standard simulation tools into courses and provides a resource for supplementary learning outside the classroom. In this course, we will learn to set up the models in Ansys Fluent and compare the laminar and turbulent jet flow results. We will also discuss the importance of the k-epsilon turbulence model in this course.

For more ways to learn, check out the Cornell edX course, A Hands-on Introduction to Engineering Simulations at ansys.com/cornell.

Cornell University also offers a Fluid Dynamics Simulations Using Ansys online certificate authored by Dr. Rajesh Bhaskaran. Learn more here: https://ecornell.cornell.edu/fluiddynamics

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The Mach number, which is the characteristic non-dimensional number often used to describe the velocity of the object with respect to the speed of sound. At these speeds, shock waves, which are sharp spatial discontinuities in the flow properties such as density, velocity, and pressure, are created. Due to sudden changes in flow properties such as pressure, it becomes important to study the effect of a shock wave on the moving object for structural integrity and stability. In this SimCafe course, we will learn how to model a supersonic flow over a wedge using Ansys Workbench.

Ansys Fluent provides many in-built models to study such regular flow phenomena. However, other applications sometimes require additional customization, which in Ansys Fluent can be provided using the User Defined Functions or UDFs. A user-defined function, or UDF, is a C or C++ code that can be dynamically loaded into Ansys Fluent to enhance its standard features. For example, engineers may use a UDF to customize boundary conditions, material property definitions, and surface and volume reaction rates. This SimCafe course will demonstrate the use of UDFs for integrating the lift coefficient on a canonical problem — the flow past a cylinder.

The Mach number, which is the characteristic non-dimensional number often used to describe the velocity of the object with respect to the speed of sound. At these speeds, shock waves, which are sharp spatial discontinuities in the flow properties such as density, velocity, and pressure, are created. Due to sudden changes in flow properties such as pressure, it becomes important to study the effect of a shock wave on the moving object for structural integrity and stability. In this SimCafe course, we will learn how to model a supersonic flow over a wedge using Ansys Workbench.