ANSYS Turbo System R14.0 Update UK/staticassets... · for comprehensive turbomachinery design and analysis ... 2D Rapid “ThroughFlow” Analysis Blade and Volute Geometry Design

© 2011 ANSYS, Inc. February 23, 2012 1

ANSYS Turbo System R14.0 Update

Satish Patange


• ANSYS Turbo System Overview

• New Features in R14

• Summary

Outline


R14 Turbo Overview


• ANSYS offers a complete suite of software tools for comprehensive turbomachinery design and analysis

• ANSYS Turbo system

– Streamlined workflow using Integrated, easy to use environment for all engineering simulations

1D Sizing Tools (“Meanline” Analysis)

2D Rapid “ThroughFlow” Analysis

Blade and Volute Geometry Design

Turbomachinery Specific Mesh Generation

3D CFD with Turbo Pre- and Post-processing

Thermal and Structural Stress Analysis

Parameterization and Design Exploration

Introduction

Turbine Cooling, Courtesy Wood

Group Heavy Industrial Turbines

AG, Switzerland


ANSYS Workbench

Geometry Mesh Analysis

ANSYS

Meshing

Turbogrid

ICEM CFD

BladeModeler

BladeGen

DesignModeler

with

BladeEditor

ANSYS CFX

Vista TF

FLUENT

ANSYS FEA

Meanline Tools

Parameterization

Design Exploration

ANSYS Turbo system – R 14


ANSYS Workbench Project Sheet

CFD Analysis FEA Simulation

FSI:

Bi-Directional

Coupling

FSI:

Uni-Directional

Coupling

BladeGen Turbogrid

Design Modeler

Parameterization

Design Exploration

ANSYS Turbo system Environment


Turbomachinery Design and Analysis Using the Turbo system

ANSYS Vista CCD, CPD, RTD or

AFD

ANSYS Vista TF

ANSYS BladeEditor

ANSYS Mechanical

ANSYS BladeGen

CAD Package

ANSYS TurboGrid

ANSYS CFX/Fluent


R14 Turbo – New Features


Vista Backwards Compatibility

Initialize Vista “Blade Design” from imported BladeGen model containing Vista data (AFD, CCD, RTD)


Vista Design Tools and BladeModeler

Vista Design Tools

• Vista AFD integration in WB

– 3 stages: Meanline, design, analysis

– Transfer to BladeModeler

• Ability to initialize Vista “Blade Design” from imported BladeGen model

BladeModeler

• User-defined layers in BladeModeler

• Meridional Curvature Graph

• Camberline Workflow Improvements

– Simplified

– Consistent with Airfoil Design Mode


Vista AFD

Meanline Design

Analysis


Vista AFD in Workbench

• Vista AFD design can be transferred to BladeGen

or BladeEditor for further design optimization and

analysis

• Fan geometry may include IGV and/or OGV


BladeEditor User Defined Layers

Flow path layers created using sketch curves

Individual curve or curve chain defines unique layer in flow path

One sketch may define multiple layers

Curves need not extend to LE/TE or Inlet/Outlet

Many times designers do not use layers of constant span:

• Constant distance from hub or shroud

• Constant radial or axial offset

• Layers that follow streamlines

• Defining end of blade in cases with hub/tip clearance

Allows similar flexibility as BladeGen

• Many users will be able to migrate to BladeEditor


BladeEditor Meridional Curvature Graph

New auxiliary graph shows meridional curvature for hub and shroud contours

Select FlowPath, curvature shown for full extent of flow path

Select Blade, curvature shown between LE and TE

Left-click graph to show curvature location


BladeEditor Camberline Workflow Improvements

Objectives:

• Simplify ease of initial blade creation

• Simplify Camberline/Blade feature hierarchy in tree view

• Simplify camberline insertion and deletion

• Make Camberline Design Mode consistent with Airfoil Design Mode


BladeEditor Simplified Tree Hierarchy

Removed Camberline definitions from root level

R 13.0 R 14.0


BladeEditor Simplified Layer Insertion and Deletion

Camberline sub-features created automatically when activated under Blade feature

Angle/thickness definitions for a new camberline initialized by interpolating from existing camberlines

Camberline sub-features can be de-activated to remove


BladeEditor Splitter Enhancements

Splitter can reference angle/thickness directly from main blade

Angle/Thickness definition choices:

• User Specified

• From Reference Blade

• Interpolated (for non hub/shroud layers)


BladeEditor Tutorial (Centrifugal Compressor) has been updated to reflect these changes in R 14.0

• Looking at Auxilliary views

• Adding Blade Clearance

Updated BladeEditor Tutorial


TurboGrid 14.0 Enhancements


TurboGrid

Highly automated blade row meshing – without sacrificing quality (TurboGrid)

• ‘ATM’ method expanded to handle (single) splitter blades

• No manual template positioning required

• Additional enhanced templates available


TurboGrid ATM Splitter Local Mesh Refinement


TurboGrid: Enhanced ATM Templates

Double-herringbone template added to improve mesh resolution for cut-off blades with lower blade angles


TurboGrid: Enhanced ATM Templates

New templates added to improve mesh resolution near rounded leading and trailing edges


TurboGrid 14.0

Recommended by development to run with Beta features turned on

• Will automatically invoke new beta templates for ATM

• Generally will result in better mesh quality

• Implemented late in development phase

• Not enough time to test for 14.0

• Have tested for 14.5, promising results


Example:

Beta Features On Beta Features Off


Example

Beta Features On Beta Features Off


TurboGrid: New Default Mesh Rendering

No more white on black!

Lines use default colour

• White with black background

• Black with blue gradient background

Default surface colours shown

Colours are stored in state files

• Fresh state is needed or delete the mesh rendering section of your existing state


TurboGrid: Option to Prefix Name to Mesh Regions (Beta)

New region name prefix

Workbench project schematic

• Specified in TurboGrid mesh properties panel

Mesh Export

• Name specified in Save Mesh panel

No name specified by default

• No change to default behaviour


ANSYS CFD 14.0 Turbo Enhancements


Turbo-specific enhancements for ANSYS CFX and ANSYS FLUENT

Turbomachinery applications benefit from advances in other areas including:

• Turbulence modeling

• Heat transfer (conjugate heat transfer)

• Solver numerics (robustness, accuracy)

• General meshing technologies in AM, ICEM CFD, Tgrid

• General post-processing

• Workbench enhancements

R14 CFD Solver Enhancements


Rotating Machinery

Highly efficient time accurate simulations with Transient Blade Row capability (CFX)

• Several models available

– Time Transformation (TT)

• Inlet Disturbance

• Single Stage TRS

– Fourier Transformation (FT)

• Inlet Disturbance

• Single Stage TRS β

• Blade Flutter β

Surface pressure distribution (top) and monitor

point pressure (left) from an axial fan stage:

Equivalent solution with Time Transformation at

fraction of computational effort

Reference solution

without a TBR method,

requiring 180 deg model

Time Transformation

solution, requiring only

3 stator and 2 fan blades


CFX Pre 14.0 Enhancements

Workflow extensions for Transient Blade Row (CFX)

• Incorporation of TBR methods in Turbo setup mode

– Switch to general mode for case-specific details

• Profile replication and clocking for inlet disturbances

– Automatically ensure complete circumferential overlap of profile with mesh

– Select profile and specify rotation rate

Easier set-up of monitor points for rotating machinery (CFX) β

• Specification in cylindrical coordinates


• Support for two use cases:

Time transformation setup

Inlet Disturbance • Stationary signal and rotating passage • Rotating signal and stationary passage

Rotor stator interaction


Fourier Transformation setup

• Support for the inlet disturbance case

– Use of double passage methodology

• Replication must be done when loading passage mesh

• Creation of Sampling domain interface is done automatically when using turbomachinery wizard.


• Support for the rotor stator interaction (beta feature)

– Also uses double passage methodology

Fourier Transformation setup


• Solution output is compressed using Fourier series

• Solution variables automatically compressed.

• Derived quantities must added manually, for example,

• Stationary Frame quantities

• Quantities required for performance calculations.

• Compression is done only during the last period of the run.

Transient results output


Mixing plane enhancements (Fluent)

• Embedded reference frames – released feature

• Stretched non-conformal interfaces (SNCI) – beta feature

• New mixing plane (based on SNCI) – beta feature


Embedded Reference Frames

R14 enhancement – relative axis origin moves with embedded reference frame for moving mesh cases

No need for UDF


CFD Post 14.0 Turbo Enhancements


Rotating Machinery

Additional integrated turbo analysis capabilities (CFD-Post)

• Reduce need to export data and manipulate externally

• Directly assess stream-wise changes in span-wise distributions of circumferential averages

– Look at differences or ratios of existing variables, e.g. pressure ratio

• Further derived data possible with ability to define separate lines

Improved turbo-specific post-processing in CFD-Post


• Similar workflow for true transient simulations:

– Solution is presented within a period, and the timestep selector can be customized to any number of timesteps within the period.

– Solution can be visualized at any time within the period.

– Solution can be reconstructed at any instance for the entire wheel (beta)

– Integrated quantities can be evaluated at any time, and plotted within the period.

– Time averages can be obtained from the transient charts.

– Machine efficiency can be computed from instantaneous or averaged quantities.

Transient blade row post-processing


• 3 new tutorials:

– Inlet disturbance for Time and Fourier transformation

– Rotor stator interaction using Time transformation

• Beta documentation

– Illustration of expansion of single blade passage into full wheel

– Examples for rotor stator interaction, and blade flutter using Fourier transformation.

– Example of multi-stage modeling using Time transformation.

Supporting material

Time Transformation


• Turbomachinery modeling was a major area of focus at R 14.0

• Better integration of Turbo tools in Workbench

• Implementation and improvement of Time Transform and Fourier Transform methods for Transient blade row analysis

Summary

Documents

ANSYS Turbo System R14.0 Update UK/staticassets... · for comprehensive turbomachinery design and analysis ... 2D Rapid “ThroughFlow” Analysis Blade and Volute Geometry Design