Fluids Engineering Courses

Fluids
Learn Simulation

Wind Blade Analysis for Wind Power

Fluids
Learn Simulation

Vertical Axis Wind Turbine — Part 1

Fluids
Learn Simulation

Vertical Axis Wind Turbine — Part 2

Fluids
Learn Simulation

3D Convection in an Electronics Box

 

 

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.

A jet, which is a type of free shear flow, is exhaust from a confined source such as a nozzle into the quiescent surrounding. 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. In this SimCafe 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.

In most industrial applications, forced convection is used for effective and efficient heat transfer in applications like steam turbines, heat exchangers, etc. When the forced fluid flow is turbulent, it increases the mixing rates and eventually leads to an increased heat transfer compared to a laminar fluid flow. These heat transfer rates can be calculated with the help of engineering simulations. In this SimCafe course, we consider a turbulent flow through a pipe with a heated section at the middle of the pipe.

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.

When the airflow passes over the chimney at a low Reynolds number, the flow is symmetric. As the Reynolds number of the flow increases, the flow field becomes asymmetric, leading to the creation of periodic vortex structures in the flow. These are called Von Karman Vortices, and they detach periodically from the body creating a repeating pattern of swirling vortices behind it. When the frequency of these vortices matches the resonance frequency of these tall structures, it can induce violent oscillations in the structure that might damage or, worse, destroy the chimney. In this Sim Café example, we will consider the canonical problem of unsteady flow past a cylinder to understand the aerodynamic effects of wind on chimneys.

An airfoil is the cross-sectional shape of the wing of an airplane or a propeller blade. The airfoil body is designed to mainly produce two aerodynamic forces: (1) perpendicular to the free stream flow, which is called the lift force, and (2) a resistive force in the direction of the free stream flow, which is called the drag force. The airfoil shape, its surface area, and angle of attack play an important role in deciding the magnitude of these aerodynamic forces on the airfoil. In this SimCafe course, we will learn to conduct a CFD analysis of the NACA 0012 Airfoil at 6 degrees angle of attack placed inside a wind tunnel by following the end-to-end workflow using Ansys Workbench.

The fluctuations in the flow are caused by swirling flow structures, or eddies, that can exist in a wide range of sizes in the flow — some small, that are homogeneous and independent, and others large, governed by the flow field.  To study the effect of turbulence, the transport phenomena associated with all these vortices need to be resolved, which is not always possible due to computational hardware limitations. To mitigate this, the concept of time-averaging is introduced and a set of equations, called the Reynolds Averaging Navier-Stokes (RANS), are developed. In this SimCafe course, we will learn to model the turbulent flow inside a pipe using the Reynolds Averaged Navier-Stokes (RANS) approach.

Due to the fluid properties (viscosity in particular), external flows show different characteristics near the object’s surface compared to regions away from the object. The formation of a boundary layer, which is a thin narrow viscous region near the object’s surface, is one common element in all external viscous flows. Simulations help us calculate these forces and make the required design changes to obtain higher lift and minimize drag. In this Sim Cafe course, we consider a canonical problem of steady flow over a flat plate to understand the aerodynamic effects on a flat surface using Ansys Workbench.

In a flow network, the flowing fluid encounters devices and attachments such as valves and bends. In addition to this, the fluids also may experience sudden expansions or contractions during the flow. Due to these inevitable pipe fittings and designs, the fluid experiences a loss of energy. In many industries, such as power generation, these losses compound and could become significant. In this Sim Cafe course, we consider steady laminar flow through a pipe with sudden expansion to understand the energy loss due to the expansion using Ansys Workbench.

The study of blood flow through arteries can help understand the level of plaque formation inside the artery. In such scenarios, it is important to understand the velocity, pressure, and wall shear stress to determine the efficiency of blood flow. In this SimCafe course, we learn to model the blood flow through the artery by following the end-to-end workflow in Ansys Fluent.

The process of diffusion takes place completely because of concentration gradients. Diffusion is a transient process where the rate of diffusion changes with the temporal variation of concentration of the system. Sound knowledge of diffusion rates helps engineers design industrial equipment for higher efficiency, and engineering simulations play a significant role in predicting these diffusion rates. In this SimCafe course, we learn how to model a two-dimensional transient diffusion problem in Ansys Fluent and compare the obtained numerical solution with the analytical result.

Wind turbines are used to convert the kinetic energy of the moving wind into electrical power. The main components of a wind turbine are the rotor blades, generator, gearbox, and controls system. The rotor blades are directly exposed to heavy winds and should be designed to withstand these loads. They experience both lift and drag forces, and to produce maximum power, higher lift and lower drag coefficients are desirable. In this SimCafe course, we will use a periodic section around a turbine blade and study forces on the same using Ansys Fluent.

It is critical to understand and study the distribution of the aerodynamic forces for the stability of the tall structures such as chimneys. These forces can be estimated with the help of engineering simulations. In this SimCafe Course, we consider a canonical problem of steady flow past a cylinder to understand the aerodynamic effects of wind on chimneys using Ansys Workbench.

Wind turbines are used to capture the kinetic energy of the wind and convert it into electrical energy. Depending on the orientation of the rotor shaft, wind turbines are typically categorized as (1) vertical axis wind turbine (VAWT), and (2) horizontal axis wind turbines (HAWT). To increase the efficiency of these turbines, a design engineer must consider the aerodynamic forces on blades and the flow behavior around these blades. Engineering simulations are commonly used to estimate these aerodynamic forces. In this course, we will use the Multiple Reference Frame (MRF) approach to model the Vertical axis wind turbine using Ansys Fluent and study the flow behavior around its blades.

To increase the efficiency of wind turbines, a design engineer must consider the flow behavior around these blades and estimate the aerodynamic forces developed by the flowing wind. Engineering simulations are commonly used to estimate these aerodynamic forces. At low wind speeds, the flow around turbine blades is typically steady. But as the wind speed increases, the flow behavior around blades becomes transient. This creates vortices in the flow. In this SimCafe Course, we will use the transient sliding mesh approach to model the vertical axis wind turbine using Ansys Fluent and study the unsteady flow behavior around its blades.

The study of blood flow through arteries can help understand the level of plaque formation inside the artery. In such scenarios, it is important to understand the velocity, pressure, and wall shear stress to determine the efficiency of blood flow. In this SimCafe course, we learn to model the blood flow through the artery by following the end-to-end workflow in Ansys Fluent.

Most fluid flows (gas or liquid) are turbulent in nature. These flows are characterized by unsteady and irregular fluctuations of transport quantities such as mass, momentum and species in both space and time. These fluctuations enhance flow mixing. In this SimCafe course, you will learn how to model three dimensional internal turbulent pipe flow. You will create the geometry, the computational mesh and set up the boundary conditions needed for the simulation. The fundamental concepts and the steps needed to successfully model this fluid flow problem are explained using step-by-step instructions.

A mixing layer is formed when two parallel streams of fluids are moving at different velocities such that the velocity at the fluid-fluid interface is non-zero. In the absence of dissipative forces such as viscosity, small perturbations at the fluid-fluid interface lead to the creation of vortices at the interface. In this SimCafe course, you will learn how to model the 2D periodic double shear layer using Ansys WorkBench. You will create the geometry, computational mesh, and set up the boundary conditions needed for the simulation, and learn about the fundamentals of particulate laden flow. The concepts and the steps needed to successfully model this fluid flow problem are explained using immersive step-by-step walk-through videos.

Combustion is a process that includes two processes viz. thermal and chemical in which a hydrocarbon fuel reacts with an oxidant to form products, accompanied by the release of energy in the form of heat. It is an integral part of various engineering applications like internal combustion engines, aircraft engines, rocket engines, furnaces, and power station combustors. Combustion simulation is used broadly during the design, analysis, and performance stages of the above-mentioned applications. In this SimCafe course, you will learn how to model axisymmetric case for cylindrical combustion chamber with the fuel (CH4) and air mixture. You will set up the boundary conditions needed for the simulation. The fundamental concepts and the steps needed to successfully model this fluid flow problem are explained using step-by-step instructions.

Diffusion is a process resulting from the movement of a substance from an area of high concentration to an area of low concentration. It is completely driven by a concentration gradient. In this SimCafe course, you will learn how to model 3D diffusion of gas using Ansys WorkBench. You will set up the boundary conditions needed for the simulation. The fundamental concepts and the steps needed to successfully model this fluid flow problem are explained using immersive step-by-step walkthrough videos.

Cooling electronics components is important for a smooth, reliable operation. The thermal power generated by the electronics is detrimental to their operation and often leads to premature failure and a shortened lifecycle. In this SimCafe course, you will learn to model the convective heat transfer through an electronics box by following the end-to-end workflow in Ansys Workbench. You will create the computational mesh and set up the boundary conditions needed for the simulation. The fundamental concepts and the steps needed to successfully model this fluid flow problem are explained using step-by-step instructions.

In this SimCafe course, we will learn how to model transonic flow over an aircraft wing in Ansys Fluent and analyze the results. We will learn the end-to-end workflow in Ansys Workbench and go through all the steps in detail.

Bio-medical researchers have been relying on computational fluid dynamics to model and understand the physical mechanisms behind the formation and progression of hemodynamic disorders. In this SimCafe course, you will learn how to model three dimensional internal blood flow in a bifurcating artery. You will create the computational mesh and set up the boundary conditions needed for the simulation. The fundamental concepts and the steps needed to successfully model this fluid flow problem are explained using immersive step-by-step walk-through videos.

Converging-diverging nozzles are used extensively in the area of propulsion, where they are designed to generate the required thrust and assist in the maneuverability of the aircraft or rocket. In this regard, it is important to analyze the flow within the nozzle and reduce the total pressure losses. In this SimCafe course, you will learn how to setup a simulation to analyze the flow through the nozzle and analyze the results.