Proceedings of 25th European Workshop on Thermal and ECLS … · 2012-03-09 · ESATAN Thermal...

145

Appendix I

ESATAN Thermal Modelling SuiteProduct Developments

Chris Kirtley(ITP Engines UK Ltd, United Kingdom)

25th European Workshop on Thermal and ECLS Software 8–9 November 2011

146 ESATAN Thermal Modelling Suite — Product Developments

Abstract

ESATAN-TMS provides a powerful, integrated thermal modelling environment. Since the release ofESATAN-TMS r3 in January 2011, major developments have been undertaken in the area of importingCAD geometry and interactive geometry creation. New functionality include an automated facility todefine and generate contact conductances between surfaces, the ability to include wavelength dependentthermo-optical properties and a mechanism to perform axisymmetric analysis. This presentation outlinesthe developments going into the next release of the product.


ESATAN Thermal Modelling Suite

Product Status

Author: Chris J Kirtley Date: 8th November 2011

25th European Thermal & ECLS Software Workshop ESA/Estec, Noordwijk, the Netherlands

2

Introduction

– Provide a complete and effective thermal modelling

environment • Functionality to meet your current & future modelling

requirements

• Provide a high-quality and fully validated product

– Efficient end-to-end integration within a multi-disciplinary engineering environment

– Backing this up with professional customer support services

• Our vision remains unchanged,

ESATAN Thermal Modelling Suite — Product Developments 147


3

Introduction

r1 • Time & Temperature Dependency

• Time Dependent Steering

• Shell Assignment

• Non-orbital Analysis

• Extension of Picking

• Coordinate Output

• ESATAN Double Precision

• Transient Solver Improvements

• Performance & Scalability

• User-defined Feature Requests

2009 2010 2011

4

Introduction

r1 r2 • Support for Groups

• Extension of Nastran Import

• Performance & Scalability


2009 2010 2011



5

Introduction

r3

• Improved Import of CAD Geometry

• Combined FE / LP Analysis

• Enhanced Model Tree Component

• New Conjugate Gradient Thermal Solver

• Contour Plotting

• Extension of Post-processing (ThermNV)

• Post-processing ThermNV derived data in Workbench


r2 r1

2009 2010 2011

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Introduction

• Current developments – Improved Geometry Modelling – Performance Enhancement

– Face-to-Face Conduction Support

– Wavelength Dependent Thermo-optical Properties

– Axisymmetric Analysis

– User-defined Feature Requests

• ESATAN-TMS r4 is now available



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Improved Geometry Modelling

8


• Aim - Reduce the model creation time • Geometry created in Workbench or imported from CAD • Last year presented developments to CAD import

– Mesh refinement – Shape recognition – De-feature geometry

• Focus on geometry creation process within Workbench



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• Additional construction points to facilitate creation of geometry – Construction points at Shell centres & Face vertices – Concept of literal Points

• No name assigned • Specify coordinate position • Not listed on the model tree • Not associated with a shell • Can be deleted by picking

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• Additional construction points to facilitate creation of geometry – Construction points at Shell centres & Face vertices – Additional Point construction methods

• Point of intersection of 2 lines

• Literal or Named Point • Closest point, line 1 if do not intersect



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• Additional construction points to facilitate creation of geometry – Construction points at Shell centres & Face vertices – Additional Point construction methods

• Point of intersection of 2 lines • Points on a line

• Literal Points • Defined by No. points or positions

12


• New shell definition method “Define by Circle” – 3 points to define a circle

• Disc, sphere – Height

• Cylinder, Paraboloid, Cone



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• Shell Transformation – Enhanced user interface

Axis & Vector Move Origin – New transform methods

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• Simplified data entry – Auto-completion of “Define by Direction” fields

Direction

Origin & Length

Origin, Height & Radius

Origin & Radius

Box, Rectangle, Triangle & Triangular_Prism

Disc & Sphere

Cone, Cylinder & Paraboloid

– Auto-highlight field values on tabbing

– Picking of points even when points not displayed



15


• Control of displayed shells on Groups, Bulks & Opticals

Multiple Bulks Selected

New Display Options

Undisplay Icon

16

Performance Enhancements



17


• General performance improvements ≈ Doubling of speed over r3

• Reduction of memory requirements

– Limit on Reporting & Command window buffer • Buffer size user preference (default 10,000)

• Redirect reports to a named file

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• New solution parameters to control of analysis – Limit the REFs via “Ray Total Cutoff” (default 0.005 / 0.5%)

• Percentage of the total energy emitted from a face • VFs/REFs omitted after the radiative run • Reduces the memory usage • Improve the performance of the Analysis Case • Reduced thermal analysis file size • Reduced thermal solution time



19


• New solution parameters to control of analysis – Analysis Case parameter “HF Minimum Deviation” – HF assumed constant if deviation < HF Minimum Deviation

timeHF

timeHF

– Default 0.005 / 0.5% – Reduced thermal analysis file size – Reduced thermal solution time – File Optimisation parameters

grouped

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Face-to-Face Conduction Support



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• Automatically generate conductances between surfaces in contact – New variable Contact Zones

22



• Define surfaces in contact – Select a Shell side, Face or Group (of Faces or Shell Sides) – Congruent mesh not required



23



• Define contact conductance – Literal or a Property

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• Ray-trace to determine Faces in contact / associated area – Define sample points (default 10,000) – Define maximum gap (default 0.01m)



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• Report Contact Zone data – Node pairs & calculated contact area – Total contact area

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Wavelength Dependent Thermo-optical Properties



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– Piece-wise Grey Body method – IR spectrum divided into bands – Steady state and transient

analysis supported – Moving or non-moving geometry

supported

• For systems with significantly varying temperatures the “semi-grey body” idealisation no longer sufficient

• Support definition of wavelength dependent optical properties

Wavelength

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• Optical data defined using Property Environments

• Run radiative analysis for each waveband



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• Run thermal analysis – Define Analysis Case – Wavelength Dependent – Associate Radiative Cases

– Define waveband array – Run analysis

• Post-process thermal results in Workbench

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Axisymmetric Analysis



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• Development to meet customer requirements

– Workbench used to perform axisymmetric analysis

– Model defined within the X-Y plane • Y – Axial direction • X – Radial direction

– Planar shells used to represent the section geometry

– Thermal model generated representing the 3D model

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• Additional boundary conditions supported – Volumetric heat load

• Shell side, Face or Group – Convection to an edge

• Edge defined by a contiguous Group of Thermal Nodes

• First release of functionality – Further GUI support – Input on further requirements



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User-defined Feature Requests

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• Focus on addressing user-defined Feature Requests – Ability to set the default overlay

• Model Preferences • Default changed to Colour

Recursive attribute editing on Label Label per Shell side



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• Focus on addressing user-defined Feature Requests – Clear button on Command History window

• Clears specified area

– Auto-section of results / time steps on pre- & post-process – Run directly parametric solution from Workbench – Default Analysis File name – Contract Above menu item

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Conclusion



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Conclusion

• ESATAN-TMS r3 extended CAD Import capability

• ESATAN-TMS r4 extends the interactive geometry modelling capability

• Process still requires a clean CAD geometry CADConverter

38

Conclusion

• Need the ability to visualise the CAD geometry

• Need the ability to edit the CAD geometry

CADConverter

Henri will talk more about this



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Proceedings of 25th European Workshop on Thermal and ECLS … · 2012-03-09 · ESATAN Thermal...

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