rt-05-intro-tut-27-Turbo-Post.pdf

(517 KB) Pobierz
Chapter 27: Turbo Postprocessing
27.1. Introduction
This tutorial demonstrates the multistage turbomachinery postprocessing capabilities of ANSYS FLUENT.
In this example, you will read the case and data files (without doing the calculation) and perform a number
of turbomachinery-specific postprocessing operations.
This tutorial demonstrates how to do the following:
•
Define the topology of a turbomachinery model while using theta min and theta max.
•
Create surfaces for the display of 3D data.
•
Revolve 3D geometry to display a 360-degree image.
•
Report multistage turbomachinery quantities.
•
Display averaged contours for turbomachinery.
•
Display 2D contours for turbomachinery.
•
Display averaged XY plots for turbomachinery.
27.2. Prerequisites
This tutorial is written with the assumption that you have completed Introduction to Using ANSYS FLUENT:
Fluid Flow and Heat Transfer in a Mixing Elbow (p. 111) and that you are familiar with the ANSYS FLUENT
navigation pane and menu structure.
27.3. Problem Description
The problem considered in this tutorial is an axial compressor shown schematically in Figure 27.1 (p. 1008) .
The model comprises a single 3D sector of the compressor to take advantage of the circumferential periodicity
in the problem. The flow of air through the compressor is simulated and the postprocessing capabilities of
ANSYS FLUENT are used to display realistic, full 360-degree images of the solution obtained.
Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
1007
804892741.015.png 804892741.016.png
Chapter 27: Turbo Postprocessing
Figure 27.1 Problem Schematic
27.4. Setup and Solution
27.4.1. Preparation
1.
Download turbo_postprocess.zip from the ANSYS Customer Portal or the User Services Center
to your working folder (as described in Preparation (p. 4) of Introduction to Using ANSYS FLUENT in
ANSYS Workbench: Fluid Flow and Heat Transfer in a Mixing Elbow (p. 1) ).
2.
Unzip turbo_postprocess.zip .
turbo.cas.gz and turbo.dat.gz can be found in the turbo_postprocess folder after unzipping
the file.
3.
Use FLUENT Launcher to start the 3D version of ANSYS FLUENT.
For more information about FLUENT Launcher, see Starting ANSYS FLUENT Using FLUENT Launcher in the
User’s Guide.
The Display Options are enabled by default. Therefore, after you read in the case and data files, the mesh will
be displayed in the embedded graphics window.
Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
1008
804892741.017.png 804892741.018.png 804892741.001.png
27.4.3. Step 2: General Settings
27.4.2. Step 1: Mesh
1.
Read the case and data files( turbo.cas.gz and turbo.dat.gz ).
®
®
File
Read
Case & Data...
When you select turbo.cas.gz , turbo.dat.gz will be read automatically.
27.4.3. Step 2: General Settings
General
1.
Display the mesh.
®
General
Display...
a.
Retain the default Edges option in the Options group box.
b.
Select Outline in the Edge Type list.
c.
Deselect all the surfaces from the Surfaces selection list and click the Outline button.
d.
Click Display .
e.
Rotate the view by clicking the Rotate View icon (
) in the toolbar, press the left mouse button
and drag the mouse. To zoom in or out, press the Zoom In/Out button and press the left
mouse button and move the mouse up and down. To obtain an isometric display, select the Iso-
metric view icon
in the toolbar.
f.
Close the Mesh Display dialog box.
Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
1009
804892741.002.png 804892741.003.png 804892741.004.png 804892741.005.png 804892741.006.png 804892741.007.png 804892741.008.png 804892741.009.png
Chapter 27: Turbo Postprocessing
Extra
You can use the right mouse button to check which zone number corresponds to each boundary.
If you click the right mouse button on one of the boundaries displayed in the graphics window,
its zone number, name, type, and other variables will be printed in the console. This feature is
especially useful when you have several zones of the same type and you want to distinguish
between them quickly.
27.4.4. Step 3: Defining the Turbomachinery Topology
You will define the topologies of the flow domain in order to establish a turbomachinery-specific coordinate system.
This coordinate system is used in subsequent postprocessing functions. Specifically, you will select the boundary
zones that comprise the hub, shroud, inlet, outlet, and periodics. The boundaries may consist of more than one
zone. The topologies that you define will be saved to the case file when you save the current model. Thus, if you
read the saved case back into ANSYS FLUENT, you do not need to set up the topology again.
For more information on defining turbomachinery topologies, see Defining the Turbomachinery Topology
in the User’s Guide.
®
Define
Turbo Topology...
1.
Specify the surfaces representing the hub.
a.
Retain the default selection of Hub in the Boundaries group box.
b.
Select the surface that represent the hub ( rotor-hub ) in the Surfaces selection list.
2.
Specify the surfaces representing the casing.
Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
1010
804892741.010.png 804892741.011.png 804892741.012.png
27.4.4. Step 3: Defining the Turbomachinery Topology
a.
Select Casing in the Boundaries group box.
b.
Select rotor-shroud in the Surfaces selection list.
3.
Specify the surfaces representing theta periodic.
Theta periodic are all rotationally periodic boundary conditions surfaces (periodic boundary condition type)
which border the turbo topology on the lateral (pitchwise) boundaries.
a.
Select Theta Periodic in the Boundaries group box.
b.
Select rotor-periodic-wall-1 and rotor-periodic-wall-2 in the Surfaces selection list.
4.
Specify the surfaces representing theta min.
a.
Select Theta Min in the Boundaries group box.
b.
Select rotor-blade-suction in the Surfaces selection list.
Theta Min and Theta Max are all walls which may border the turbo topology on the lateral (pitchwise)
boundaries. The “min” and “max” are determined by the right hand rule about the axis of rotation. Specifically,
using the right hand rule, the min surfaces would have the minimum pitchwise coordinate and the max
surfaces would have the maximum pitchwise coordinate.
5.
Specify the surfaces representing theta max.
a.
Select Theta Max in the Boundaries group box.
b.
Select rotor-blade-pressure in the Surfaces selection list.
6.
Specify the surface representing the inlet.
a.
Select Inlet in the Boundaries group box.
b.
Select rotor-inlet in the Surfaces selection list.
7.
Specify the surface representing the outlet.
a.
Select Outlet in the Boundaries group box.
b.
Select rotor-outlet in the Surfaces selection list.
8.
Retain the default name of new-topology-1 for the Turbo Topology Name .
9.
Click Define to set all the turbomachinery boundaries.
Create a second topology to represent the stator.
10.
Specify the surfaces representing the hub.
a.
Select Hub in the Boundaries group box.
b.
Select the surface that represent the hub ( stator-hub ) in the Surfaces selection list.
Tip
Scroll down the Surfaces list to locate the surfaces representing the hub.
11.
Specify the surfaces representing the casing.
a.
Select Casing in the Boundaries group box.
b.
Select stator-shroud in the Surfaces selection list.
12.
Specify the surfaces representing theta periodic.
a.
Select Theta Periodic in the Boundaries group box.
Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
1011
804892741.013.png 804892741.014.png

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin