Laws Ansys Cfx Tutorial Pdf


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Table of Contents. 1. Introduction to the ANSYS CFX Tutorials. Running ANSYS CFX Tutorials Using ANSYS Workbench. Playing a Tutorial Session File. Obtaining a Solution Using ANSYS CFX-Solver Manager. Table of Contents: Tutorial 2: Flow in a Static Mixer (Refined Mesh). Page vi PDF Flamelet. Hello All! Does someone of you know where can I find the tutorials PDF for ANSYS CFX 18, or.

Ansys Cfx Tutorial Pdf

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trademarks of ANSYS, Inc. or its subsidiaries in the United States or other CFX is a trademark CFX Download C++ Tutorial - Tutorials Point - Tutorials for. ANSYS CFX Tutorial. Laminar Flow in a Rectangular Duct. 22 January V4. Department of Mechanical Engineering. Page 1 of University of. This is the first tutorial introducing the student to using ANSYS-CFX. The tutorial shows how the research should read the geometry file into ANSYS. Then how.

Specular Lighting Moving the Light Source Thermal Data Mechanical Stresses Multiphase Flow in a Mixing Vessel Importing the Meshes Importing the Mixer Tank Mesh Importing the Impeller Mesh Relocating the Impeller Mesh Viewing the Mesh at the Tank Periodic Boundary Rotating Domain for the Impeller Stationary Domain for the Main Tank Air Inlet Boundary Degassing Outlet Boundary Thin Surface for the Baffle Wall Boundary for the Shaft Required Boundary in the Impeller Domain Modifying the Default Wall Boundary Modeling the Blade Using a Domain Interface Rotational Periodic Interfaces Frozen Rotor Interfaces Adding Monitor Points Creating a Plane Locator Plotting Velocity Plotting Pressure Distribution Plotting Volume Fractions Calculating Torque and Power Requirements Gas-Liquid Flow in an Airlift Reactor Draft Tube Boundaries Modifying the Default Boundary Creating Water Velocity Vector Plots Creating Volume Fraction Plots Displaying the Entire Airlift Reactor Geometry Air Conditioning Simulation Importing CEL Expressions Compiling the Fortran Subroutine for the Thermostat Setting the Analysis Type Window Boundary Closet Wall Interface Creating Space Under the Closet Door Creating Graphics Objects Creating Planes Creating an Isosurface Adjusting the Legend Creating a Point for the Thermometer Creating a Text Label Creating an Animation Combustion and Radiation in a Can Combustor Creating a Reacting Mixture To create the variable composition mixture Fuel Inlet Boundary Bottom Air Inlet Boundary Side Air Inlet Boundary Vanes Boundary Temperature Within the Domain The NO Concentration in the Combustor Printing a Greyscale Graphic Viewing Flow Field Viewing Radiation Removing Old Reactions Importing a New Reaction Generating the Flamelet Library Modifying the Reacting Mixture Modifying the Default Domain Modifying the Boundaries Viewing Temperature within the Domain Viewing the NO Concentration in the Combustor Calculating NO Concentration Viewing CO Concentration Cavitation Around a Hydrofoil Simulating the Hydrofoil without Cavitation Loading Materials Free Slip Wall Boundary Symmetry Plane Boundaries Plotting Pressure Distribution Data Exporting Pressure Distribution Data Saving the Postprocessing State Simulating the Hydrofoil with Cavitation Adding Cavitation Modifying Solver Control Defining a Transient Simulation Editing the Domain Creating a Coordinate Frame Creating a Rigid Body Creating the Subdomain Ball Boundary Vertical Valve Wall Boundary Tank Opening Boundary Valve Opening Boundary Creating Points and a Vector Plot Setting up the Project Adding Analysis Systems to the Project Adding a New Material for the Project Adding Geometry to the Project Defining the Physics in the Mechanical Application Generating the Mesh for the Structural System Assigning the Material to Geometry Basic Analysis Settings Inserting Loads Fixed Support Fluid-Solid Interface Pressure Load Completing the Setup for the Structural System Creating Named Selections on the Fluid Body Generating the Mesh for the Fluid System Fluid Solid External Boundary Plotting Results on the Solid Optimizing Flow in a Static Mixer Creating the Project Creating the Geometry in DesignModeler Creating the Solid Setting Up the Grid Creating the Basic Geometry Revolving the Sketch Create the First Inlet Pipe Extrude the First Side-pipe Make the Solid Visible Create the Second Inlet Pipe Create Named Selections Creating the Mesh Using Design of Experiments Viewing the Response Surface Viewing the Optimization Aerodynamic and Structural Performance of a Centrifugal Compressor Changing the Blade Design Properties Reviewing the Geometry Defining the Mesh Defining the Shroud Tip Defining the Topology Specifying the Mesh Data Settings Generating the Mesh Specifying the Global Mesh Controls Defining the Virtual Topology Specifying the Sizing Controls Specifying the Face Meshing Controls Specifying the Method Controls Configuring the Basic Settings Defining the Components Defining the Physics Specifying the Domain Interfaces Specifying the Boundaries Setting the Final Operations Specifying the Domains Simulating the Structural Performance without Rotational Velocity Importing the Loads Specifying the Supports Obtaining the Solution Simulating the Structural Performance with Rotational Velocity Specifying the Loads Simulating the Equilibrium Phase Change Case Defining the Properties of Water Modifications to Domain and Boundary Conditions Specifying Locators for Plots Static Temperature Contour Plots Simulating the Non-equilibrium Phase Change Case Modifying the Domains Supercooling Contour Plot Modeling a Gear Pump using an Immersed Solid Creating an Immersed Solid Domain Creating the Stationary Fluid Domain Creating the Rotating Fluid Domain Creating Boundary Conditions Creating a Chart of Mass Flow versus Time Creating a Velocity Vector Plot Changing the Appearance in Preparation for an Animation Creating a Keyframe Animation Drop Curve for Cavitating Flow in a Pump Simulating the Pump with High Inlet Pressure Wall Boundaries Inblock to Passage Interface Passage to Outblock Interface Setting Solver Controls Modifying the Domain and Boundary Conditions Creating Expressions Generating a Drop Curve Viewing the Drop Curve Visualizing the Cavitation Regions Optional Exercise Restoring CFX run history and multi-configuration options Spray Dryer Creating and Editing the Boundary Conditions Water Nozzle Boundary Domain 1 Default Creating a Domain Interface Displaying the Temperature Using a Contour Plot Coal Combustion Coal Inlet Boundary Furnace No-Slip Wall Boundary Quarl No-Slip Wall Boundary Displaying the Temperature on a Symmetry Plane Displaying the Water Mass Fraction Displaying the Radiation Intensity Displaying the Temperature of the Fuel Particles Editing the Boundary Conditions Deleting the Symmetry Plane Boundaries Displaying the Temperature on a Periodic Interface Displaying the Temperature using Particle Tracking Steam Jet Creating a Steady-State Analysis Creating and Loading Materials Loading the Steam3v, Steam3l, and Steam3vl Materials Creating the Gas Mixture Material Creating the Liquid Mixture Material Creating Subdomains Gas-to-Liquid Source Subdomain Liquid-to-Gas Source Subdomain Creating Boundaries Opening Boundary for the Outside Edges Creating a Time Step Expression Displaying the Steam Molar Fraction Setting the Solver Control Setting the Output Control Creating a Contour Plot Calculating the Minimum Mesh Face Angle Simulating the Buoy with Decoupled Mesh Motion Creating a Subdomain Editing the Domain Interfaces Loading a Contour Plot from the State File Components Definition Modifying the Fluid Model Settings Initializing Profile Boundary Conditions Modifying Inlet and Outlet Boundary Conditions Obtaining a Solution to the Steady-state Case Opening the Existing Case Creating the Local Rotating Coordinate Frame Setting up a Transient Blade Row Model Creating a Turbo Surface Animating Temperature Disturbance Definition Setting the Execution Control Additional Fluid Model Settings Visualizing the Profile Boundary Value Creating a Vector Plot Creating a Variable Time Chart Setting up Data Instancing Transformations Setting up Graphical Instancing Transformations Confirming Convergence Using Derived Variables Expanding Profile Data Initializing Profile Data Modifying the Domain Creating Expressions for Frequency and Scaling Factor Modifying the R1 Blade Boundary Displaying Total Wall Work on the Blade Chapter 1: This manual contains the following tutorials: A general workflow is established for analyzing the flow of fluid into and out of a mixer.

Flow in a Static Mixer Refined Mesh p. Flow in a Process Injection Mixing Pipe p. Flow from a Circular Vent p. Flow Around a Blunt Body p.

Buoyant Flow in a Partitioned Cavity p.

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Free Surface Flow Over a Bump p. Supersonic Flow Over a Wing p. Flow Through a Butterfly Valve p. Flow in a Catalytic Converter p. Non-Newtonian Fluid Flow in an Annulus p. Flow in an Axial Turbine Stage p. Heat Transfer from a Heating Coil p. Multiphase Flow in a Mixing Vessel p. Drop Curve for Cavitating Flow in a Pump p.

Air Conditioning Simulation p. Combustion and Radiation in a Can Combustor p. Cavitation Around a Hydrofoil p. Optimizing Flow in a Static Mixer p. Aerodynamic and Structural Performance of a Centrifugal Compressor p. Modeling a Gear Pump using an Immersed Solid p. Gas-Liquid Flow in an Airlift Reactor p. Spray Dryer p. Coal Combustion p. Steam Jet p. You should review the following topics before attempting to start a tutorial for the first time: Playing a Session File 1.

Changing the Display Colors 1. Editor Buttons 1. Using Help. You can start the launcher in any of the following ways: On Windows: In a DOS window that has its path set up correctly to run CFX, enter cfx5 otherwise, you will need to type the full pathname of the cfx5 command. On Linux, enter cfx5 in a terminal window that has its path set up to run CFX. Setting Up the Project 1. Closing the Applications.

The directory you choose will be referred to as the working directory. Note You use a CFX component system because you are starting with a mesh.

Type in the new name, such as System 1, to replace the highlighted text below the system. Alternatively, you can right-click the first cell in the system and select Rename. The name will be highlighted.

Now you can change the highlighted text by typing in the new name. The required files are automatically transferred between the cells within the CFX component system.

To refresh that cell:. Note If the Solution cell displays a prompt to perform an update, ignore it and proceed to the next step. To obtain a solution, you need to launch the CFX-Solver Manager and subsequently use it to start the solver: Right-click the Solution cell and select Edit.

Click OK. If this is the final section of your tutorial, continue from Closing the Applications p. Creating CFX Component Systems for Multiple Simulations Now that you have set the physics in the initial state, you will duplicate the CFX component system created earlier and edit the physics in the new system. To duplicate the existing CFX component system: A new system named Copy of System 1 will appear in the Project Schematic.

Click the Solution cell of System 1 and drag it to the Solution cell of System 2.

You will now see a line, indicating a transfer connection, going from Solution cell of System 1 to the Solution cell of System 2. Dragging the solution cell between systems automatically sets the initialization options in CFX-Solver Manager. If you want to skip past those instructions and have CFX-Pre set up a simulation automatically, you can run the corresponding session file. To play a tutorial session file: If an Information dialog box appears, click OK.

The Define Run dialog box appears. If you were directed here at some point during a tutorial, return to that location. Some tutorials have more than one tutorial session file; each covers a particular set of CFXPre setup instructions.

Changes made to the global options are persistent and will not take effect until a new case is opened. The color options are set in different places, depending on how you run CFX: The editors have standard buttons, which are described next: Apply applies the information contained within all the tabs of an editor. OK is the same as Apply, except that the editor automatically closes.

Cancel and Close both close the editor without applying or saving any changes. Reset returns the settings for the object to those stored in the database for all the tabs. The settings are stored in the database each time the Apply button is clicked.

Defaults restores the system default settings for all the tabs of the edited object. Context-sensitive help is provided for many of the details views and other parts of the interface.

To invoke the context-sensitive help for a particular details view or other feature, ensure that the window is active, place the mouse pointer over the feature, and press F1.


Not every area of the interface supports contextsensitive help. Chapter 2: Tutorial Features 2. Overview of the Problem to Solve 2. Preparing the Working Directory 2. Viewing the Results Using CFD-Post This tutorial simulates a static mixer consisting of two inlet pipes delivering water into a mixing vessel; the water exits through an outlet pipe.

Tutorial Features In this tutorial you will learn about: Modifying the outline plot in CFD-Post. Using streamlines in CFD-Post to trace the flow field from a point. Viewing temperature using colored planes and contours in CFD-Post. Creating an animation and saving it as a movie file.

Overview of the Problem to Solve This tutorial simulates a static mixer consisting of two inlet pipes delivering water into a mixing vessel; the water exits through an outlet pipe. Water enters through both pipes at the same rate but at different temperatures. The radius of the mixer is 2 m. Your goal in this tutorial is to understand how to use CFX to determine the speed and temperature of the water when it exits the static mixer.

Figure 2. If this is the first tutorial you are working with, it is important to review the following topics before beginning: Create a working directory. Ensure the following tutorial input file is in your working directory: Set the working directory and start CFX-Pre. This is how CFX-Pre will look with the imported mesh:. Starting Quick Setup Mode 2.

Setting the Physics Definition 2. Importing a Mesh. Using the Viewer 2. Defining Model Data 2. Defining Boundaries 2. Setting Boundary Data 2.

Setting Flow Specification 2. Setting Temperature Specification 2. Reviewing the Boundary Condition Definitions 2. Creating the Second Inlet Boundary Definition 2. Creating the Outlet Boundary Definition 2. Moving to General Mode 2. Setting Solver Control 2. Starting Quick Setup Mode Quick Setup mode provides a simple wizard-like interface for setting up simple cases.

This is useful for getting familiar with the basic elements of a CFD problem setup. Note If this is the first time you are running this software, a message box will appear notifying you that automatic generation of the default domain is active. To avoid seeing this message again clear Show This Message Again. Setting the Physics Definition You need to specify the fluids used in a simulation. A variety of fluids are already defined as library materials.

For this tutorial you will use a prepared fluid, Water, which is defined to be water at 25C. Importing a Mesh At least one mesh must be imported before physics are applied.

Using the Viewer Now that the mesh is loaded, take a moment to explore how you can use the viewer toolbar to zoom in or out and to rotate the object in the viewer. Using the Zoom Tools There are several icons available for controlling the level of zoom in the viewer.

Release the mouse button to zoom in on the selection. The geometry zoom changes to display the selection at a greater resolution. Rotating the Geometry If you need to rotate an object or to view it from a new angle, you can use the viewer toolbar. Click and drag within the geometry repeatedly to test the rotation of the geometry. The geometry rotates based on the direction of mouse movement and based on the initial mouse cursor shape, which changes depending on where the mouse cursor is in the viewer.

If the mouse drag starts near a corner of the viewer window, the motion of the geometry will be constrained to rotation about a single axis, as indicated by the mouse cursor shape. A clearer view of the mesh is displayed. Defining Model Data You need to define the type of flow and the physical models to use in the fluid domain.

You will specify the flow as steady-state with turbulence and heat transfer. Turbulence is modeled using the - turbulence model and heat transfer using the thermal energy model.

The - turbulence model is a commonly used model and is suitable for a wide range of applications. The thermal energy model neglects high speed energy effects and is therefore suitable for low speed flow applications. Under Model Data, set Reference Pressure to 1 [atm]. All other pressure settings are relative to this reference pressure.

Defining Boundaries The CFD model requires the definition of conditions on the boundaries of the domain. The boundary is created and, when selected, properties related to the boundary are displayed.

Setting Boundary Data Once boundaries are created, you need to create associated data. Based on Figure 2. Setting Flow Specification Once boundary data is defined, the boundary needs to have the flow specification assigned.

Setting Temperature Specification Once flow specification is defined, the boundary needs to have temperature assigned. Reviewing the Boundary Condition Definitions Defining the boundary condition for in1 required several steps.

Here the settings are reviewed for accuracy. Review the boundary in1 settings on the Boundary Definition panel for accuracy.

They should be as follows: You will define that now. Creating the Outlet Boundary Definition Now that the second inlet boundary has been created, the same concepts can be applied to building the outlet boundary. Moving to General Mode There are no further boundary conditions that need to be set. All 2D exterior regions that have not been assigned to a boundary condition are automatically assigned to the default boundary condition.

The three boundary conditions are displayed in the viewer as sets of arrows at the boundary surfaces. Inlet boundary arrows are directed into the domain.

Outlet boundary arrows are directed out of the domain. Setting Solver Control Solver Control parameters control aspects of the numerical solution generation process. While an upwind advection scheme is less accurate than other advection schemes, it is also more robust.

This advection scheme is suitable for obtaining an initial set of results, but in general should not be used to obtain final accurate results. The time scale can be calculated automatically by the solver or set manually.

The Automatic option tends to be conservative, leading to reliable, but often slow, convergence. It is often possible to accelerate convergence by applying a time scale factor or by choosing a manual value that is more aggressive than the Automatic option. In this tutorial, you will select a physical time scale, leading to convergence that is twice as fast as the Automatic option. The simulation file differs from the CFX-Solver input file in that it can be saved at any time while defining the simulation.

Click Save. Session files have been created for each tutorial so that the problems can be set up rapidly in CFXPre. There is an adjustable split between the windows, which is oriented either horizontally or vertically depending on the aspect ratio of the entire CFX-Solver Manager window also adjustable.

One window shows the convergence history plots and the other displays text output from CFX-Solver. The text lists physical properties, boundary conditions and various other parameters used or calculated in creating the model.

When CFX-Solver Manager is launched automatically from CFX-Pre, all of the information required to perform a new serial run on a single processor is entered automatically. You do not need to alter the information in the Define Run dialog box. This is a very quick way to launch into CFX-Solver without having to define settings and values. Click Start Run. CFX-Solver launches and a split screen appears and displays the results of the run graphically and as text. Note Once the second iteration appears, data begins to plot.

Plotting may take a long time depending on the amount of data to process.

Let the process run. The viewer displays an outline of the geometry and other graphic objects. You can use the mouse or the toolbar icons to manipulate the view, exactly as in CFX-Pre. The tutorial follows this general workflow for viewing results in CFD-Post: Setting the Edge Angle for a Wireframe Object 2. Creating a Point for the Origin of the Streamline 2. Creating a Streamline Originating from a Point 2.

Rearranging the Point 2. Configuring a Default Legend 2.

Creating a Slice Plane 2. Defining Slice Plane Geometry 2. Configuring Slice Plane Views 2. Rendering Slice Planes 2. Coloring the Slice Plane 2. Moving the Slice Plane 2. Adding Contours 2. Working with Animations 2. Quitting CFD-Post. Setting the Edge Angle for a Wireframe Object The outline of the geometry is called the wireframe or outline plot.

By default, CFD-Post displays only some of the surface mesh. This sometimes means that when you first load your results file, the geometry outline is not displayed clearly. You can control the amount of the surface mesh shown by editing the Wireframe object listed in the Outline tree view. Currently only the Wireframe and Default Legend objects have visibility turned on. The edge angle determines how much of the surface mesh is visible. If the angle between two adjacent faces is greater than the edge angle, then that edge is drawn.

If the edge angle is set to 0, the entire surface mesh is drawn. If the edge angle is large, then only the most significant corner edges of the geometry are drawn. For this geometry, a setting of approximately 15 lets you view the model location without displaying an excessive amount of the surface mesh. In this module you can also modify the zoom settings and view of the wireframe. Tip While it is not necessary to change the view to set the angle, do so to explore the practical uses of this feature.

Right-click a blank area anywhere in the viewer, select Predefined Camera from the shortcut menu, and select Isometric View Z up. In the Wireframe details view, under Definition, click in the Edge Angle box. An embedded slider is displayed. Click Apply to update the object with the new setting. Notice that more surface mesh is displayed. Less of the outline of the geometry is displayed.

Creating a Point for the Origin of the Streamline A streamline is the path that a particle of zero mass would follow through the domain. You can also use the toolbars to create a variety of objects.

ANSYS CFX Tutorials

Later modules and tutorials explore this further. Under Point, enter the following coordinates: This is a point near the first inlet. Tip To create streamlines originating from more than one location, click the Ellipsis icon to the right of the Start From box. This displays the Location Selector dialog box, where you can use the Ctrl and Shift keys to pick multiple locators. Click Apply. The streamline shows the path of a zero mass particle from Point 1.

The temperature is initially high near the hot inlet, but as the fluid mixes the temperature drops. Rearranging the Point Once created, a point can be rearranged manually or by setting specific coordinates.

Properties for the selected user location are displayed. While in select mode, you cannot use the left mouse button to re-orient the object in the viewer.

The simulation of oil flow throught grinding wheel

In the viewer, drag Point 1 appears as a yellow addition sign to a new location within the mixer. The point position is updated in the details view and the streamline is redrawn at the new location. The point moves normal in relation to the viewing direction. Tip You can also click in the viewer area, and press the space bar to toggle between Select and Viewing Mode.

Configuring a Default Legend You can modify the appearance of the default legend. The default legend appears whenever a plot is created that is colored by a variable. The streamline color is based on temperature; therefore, the legend shows the temperature range. The color pattern on the legends color bar is banded in accordance with the bands in the plot.

Note If a user-specified range is used for the legend, one or more bands may represent values beyond the legends range.

In this case, these band colors are extrapolated slightly past the range of colors shown in the legend. The default legend displays values for the last eligible plot that was opened in the details view.

To maintain a legend definition during a CFD-Post session, you can create a new legend by clicking Legend. Viewing the Results Using CFD-Post Because there are many settings that can be customized for the legend, this module allows you the freedom to experiment with them. In the last steps you will set up a legend, based on the default legend, with a minor modification to the position.

Tip When editing values, you can restore the values that were present when you began editing by clicking Reset. To restore the factory-default values, click Default. Double-click Default Legend View 1. The Definition tab of the default legend is displayed. The appearance and position of the legend changes based on the settings specified. Since both are no longer visible, the associated legend no longer appears.

Creating a Slice Plane Defining a slice plane allows you to obtain a cross-section of the geometry. In CFD-Post you often view results by coloring a graphic object. The graphic object could be an isosurface, a vector plot, or in this case, a plane.

The object can be a fixed color or it can vary based on the value of a variable. You already have some objects defined by default listed in the Outline. You can view results on the boundaries of the static mixer by coloring each boundary object by a variable.

To view results within the geometry that is, on non-default locators , you will create new objects. Three Points: Point and Normal: Defining Slice Plane Geometry You need to choose the vector normal to the plane. You want the plane to lie in the x-y plane, hence its normal vector points along the z-axis. You can specify any vector that points in the Z direction, but you will choose the most obvious 0,0,1.

Slice appears under User Locations and Plots. Rotate the view to see the plane.

Configuring Slice Plane Views Depending on the view of the geometry, various objects may not appear because they fall in a 2D space that cannot be seen. The slice is now visible in the viewer.

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