HFSS 12.0 Tips and Techniques for HFSS Project Setup and Solve

HFSS 12.0 Tips and Techniques for HFSS project setup and solve

© 2009 ANSYS, Inc. All rights reserved.

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ANSYS, Inc. Proprietary

Agenda

Ansoft HFSS v12 – Enhancements: GUI, Mesh, & Solver – New Features: GUI, Mesh, & Solver – Platform Support


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Ansoft HFSS Core Technologies HFSS v12 released on September 10th, 2009

GUI GUI

Mesh Mesh


Solver Solver

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Enhancements Summary Graphical GraphicalUser UserInterface Interface Near Nearand andFar FarField FieldOverlay Overlay Adjoint Derivatives Adjoint Derivatives Imprint Imprintand andSelect Selectby byArea Area Clip Plane and Polyline cross Clip Plane and Polyline crosssection section

Mesh Mesh

Solver Solver

64-bit 64-bitVolumetric VolumetricMesh Mesh Curvilinear elements Curvilinear elements Initial InitialMesh MeshSettings Settings Increased IncreasedSpeed Speed

Mixed MixedElement ElementOrder Order Domain Decomposition Domain DecompositionMethod Method Dependent Solve Dependent Solve Port PortSolver Solverwith withDC DCExtrapolation Extrapolation


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Enhancements

Graphical GraphicalUser UserInterface Interface Near Nearand andFar FarField FieldOverlay Overlay Adjoint AdjointDerivatives Derivatives Imprint Imprintand andSelect Selectby byArea Area Clip Plane and Polyline cross Clip Plane and Polyline crosssection section


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Overlay Near and Far Field Plots on Geometry • Visualize far-field and near-field radiation patterns on model geometry • Control transparency and/or size of pattern overlay


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Edit Sources with Port PostProcessing • Option for port post-processing to affect sources for field plots


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Edit Sources with Port PostProcessing • Fields correspond with deembedding

Original geometry for ring hybrid model Modified geometry with new port location disrupts field behavior


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Operation restored by de-embedding


Streamline Plot • New plot type for field quantities – Pick source face, choose Poynting Vector and Streamline option


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Post-Processing Variables • Can be modified without resimulating the model • Can optimize complex weights of antenna elements in phased array Optimization of Phased Array Excitations

Specify Desired Scan Angle and Maximum Sidelobe Level © 2009 ANSYS, Inc. All rights reserved.

Synthesized Far-field Pattern

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Adjoint Derivatives • Derivatives of S-Parameters with respect to Design Variables – – – –

Identify which parameters influence output most Plot both S-parameters and its derivatives Focus on sensitive design parameters Enhanced optimization


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Plotting with Derivative Offsets • Tune reports and explore effects of small design changes – Real-time tuning shows impact on performance

– Tune offsets for variables included in derivative setup

Dipole Model Length Radius

“Tune” the delta for a given variable…


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Expression Cache • Evaluate and save any expression versus adaptive pass – Includes scalar and radiated field data – Enables multiple convergence criteria – Use Quick Report to generate Convergence Plot Expression Converge

Ansoft LLC 1000.00

HFSSModel1 Curve Info ExprPctDelta(L1) Setup1 : AdaptivePass Freq='12GHz' ExprPctDelta(Q1) Setup1 : AdaptivePass Freq='12GHz' ExprPctGoal(L1) Setup1 : AdaptivePass Freq='12GHz' ExprPctGoal(Q1) Setup1 : AdaptivePass Freq='12GHz'

Y1

100.00

10.00

1.00


13

0.00

2.00

4.00

6.00

8.00

10.00 Pass

12.00

14.00

16.00

18.00

20.00


Imprint • Imprint – Imprint the geometry of one object upon another

Face created from imprint


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Imprint Projection • Imprint Projection – Patch Antenna Array Imprinted on a Nosecone • Results in Faces of original object imprinted • Make sure that the distance selected is greater than the distance between the antenna and nosecone


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Enhanced Usability • Select By Area – Click and drag to rubber-band select • Right-to-left selects all objects passing through window • Left-to-right selects all objects inside window

• Select By Variable – Helps find objects tied to variables •

Select By Area –

•

Material filters –

•

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Enable the check boxes for including Solids, Sheets, and/or Lines

Hide unfiltered objects –


Enable the Exclude and Include check boxes

Object type filters –

•

Enable the Include and Exclude radio buttons

Object name filters –

•

By default, only items with external surfaces are selected

Makes unfiltered objects transparent after selection


Enhanced Usability • Multiple lumped port assignments – Multi port selection – Assign ports and reference • Useful for SI problems with multiple lumped ports


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Enhanced Usability • Clip plane – Interactively slice through arbitrary plane – Can view model geometry, mesh plots, field plots, etc.


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Definable Polyline Cross Section • Create 2D or 3D objects from polylines – Choose Cross Section Type and Size – Section is automatically swept along the polyline

• Very useful for creating parameterized geometry – Ports, traces, bends,…


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2D Chamfers and Fillets • Create Chamfers and Fillets on 2D Objects – Select a vertex graphically and choose the menu item: • Fillet or Chamfer

Fillet- Rounded edge

Chamfer - 45 degree cut © 2009 ANSYS, Inc. All rights reserved.

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Additional GUI Enhancements • • • • •

Duplicate Mesh Operations with objects Wrap Sheet command Draw Region command Create parametric setup from file Enable/Disable History editing information – Recreates the history for polylines, circles, or ellipses

• Save Sweep settings as defaults • Model Validation settings – Strict, Warning, Basic

• Warning message about object intersect – RMC on message takes you to region of intersect © 2009 ANSYS, Inc. All rights reserved.

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New Plot Types • Rectangular Stacked Plot – Plot all variations in stacked format Curve Info

XY Stacked Plot 1

Ansoft LLC

HFSSDesign1

dB(St(coax_pin_T1,coax_pin_T1)) Setup1 : Sweep1 feed_xpos='-0.5cm' feed_ypos='-0.5cm'

-5.00 -15.00 -25.00

dB(St(coax_pin_T1,coax_pin_T1)) Setup1 : Sweep1 feed_xpos='0cm' feed_ypos='-0.5cm'

-2.00 -7.00 -12.00

dB(St(coax_pin_T1,coax_pin_T1)) Setup1 : Sweep1 feed_xpos='0.5cm' feed_ypos='-0.5cm'

-2.50 -12.50 -22.50 0.00

dB(St(coax_pin_T1,coax_pin_T1)) Setup1 : Sweep1 feed_xpos='-0.5cm' feed_ypos='0cm'

-10.00 -20.00 -30.00

dB(St(coax_pin_T1,coax_pin_T1)) Setup1 : Sweep1 feed_xpos='0cm' feed_ypos='0cm'

-0.10 -0.30 -0.50

dB(St(coax_pin_T1,coax_pin_T1)) Setup1 : Sweep1 feed_xpos='0.5cm' feed_ypos='0cm'

-5.00 -15.00

1.00


1.50

2.00

22

Freq [GHz]

2.50

3.00

3.50

-25.00


User Defined Shortcuts • User Definable Keyboard Shortcuts – Define, load or save shortcut keys to common commands


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Enhancements

Mesh Mesh 64bit 64bitVolumetric VolumetricMesher Mesher Curvilinear elements Curvilinear elements Initial InitialMesh MeshSettings Settings Increased IncreasedSpeed Speed


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Mesh Generation – Updated Geometry Kernel (ACIS R19 SP2) – New Meshing Technology: • Curvilinear elements – True surface representation

• New Ansoft TAU Mesher introduced – Strict and Tolerant mode depending on model geometry

– Adaptive meshing improvements: • Higher Quality Mesh – Faster and more efficient simulations

• Reduced CPU time - Faster


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Curvilinear Elements • Right-click on Mesh Operations -> Initial Mesh Settings – Curvilinear Elements Off by Default • Apply curvilinear elements HFSS 12 can use either mesh element

Curvilinear mesh element

Coarse mesh © 2009 ANSYS, Inc. All rights reserved.

Fine mesh 26


Initial Mesh Settings • Right-click on Mesh Operations – Auto is the default setting – Ansoft TAU Mesh • Strict and Tolerant

– Ansoft Classic Mesh


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New default mesh generator

HFSS 11

HFSS 12 meshes it cleanly.


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Enhancements

Solver Solver Mixed MixedElement ElementOrder Order Domain Decomposition Domain DecompositionMethod Method Dependent Solve Dependent Solve Port PortSolver Solverwith withDC DCExtrapolation Extrapolation Remote Solve Manager Remote Solve Manager


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Solver Technology Overview • Solution Options – Direct • Default technique • Solves matrix equation Ax=b – Multi-frontal Sparse Matrix Solver to find the inverse of A – Solves for all excitations(b) simultaneously

– Iterative • Added in V11 • Solves matrix equation MAx=Mb – M is a preconditioner – Major computation is the matrix-vector multiplication: (MA)x – Iterates for each excitation – Simultaneously solve using SMP (MP/HPC License)

• Iterative Solver is more sensitive to mesh quality – Benefits from TAU Meshing


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Solver Technology Overview • Order of Basis Functions – Hierarchical basis functions • • • •

Introduced in V11 Zero or First or Second order basis functions Higher-order elements have increased accuracy One order per mesh allowed

– Mixed Order New • hp-FEM Method – Refines element order(p) and element size(h) • Automatically distributes element order based on element size • Generates optimum combination of hierarchical basis functions (Zero and First and Second) – Efficient use of computing resources © 2009 ANSYS, Inc. All rights reserved.

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Mixed Element Order Example #1 • Two waveguide horn antennas • Compared element order of basis functions – Iterative matrix solver – Mixed order reduces solver time by 100% and RAM usage by 40% Probe-fed Pyramidal Horns


Element Order

Iterative Solver Real Time (Adaptive Pass)

RAM Usage

Mesh Elements

First

7 min

4.5 GB

336k

Mixed

3 min

2.8 GB

58k

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Mixed Element Order Example #2 • Finite array of helix elements • Direct matrix solver – Mixed order reduces solver time by 30%

Finite Phased Array


Element Order

Direct Solver Real Time (Adaptive Pass)

RAM Usage

First

1hr 20min

13.8 GB

Second

4hr 45min

16.6 GB

Mixed

56 min

13.7 GB

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Ports Precision

• HFSS v12 Port Solver • 50 ohm coax adapter with Teflon support slug • In v11 solve down to 50 kHz – Fails if frequency is lower

• How much lower and more accurate can v12 solve


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Ports Precision Results


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Port Precision Results, cont. • Reliable results in v11 to 630 kHz • In v12 ~ 2.5 kHz (4e-3 lower) • Lower “noise floor”. – V11 = -110 dB – V12 = -120 dB

• Can expect a 2-3 order in magnitude lower “solvable” frequency – Improves DC Extrapolation • Important for SI designs.


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Domain Decomposition for HFSS • New feature in HFSS v12 • Distributes mesh subdomains to network of processors • Distributed memory parallel technique • Significantly increases simulation capacity

HPC distributes mesh subdomains to networked processors and memory

– 64-bit meshing

• Highly scalable to large numbers of processors • Multi-processor nodes can be utilized


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Review DDM Technique • DDM subdivides a mesh into smaller mesh “subdomains” that are solved in parallel. – A “master” node iteratively solves for total solution – Subdivision into domains is automated • Easy to use!!! • The user defines a set of N available compute nodes to be used for a DDM solution – n=1 is the “master” node, single core – n=2 to N are the sub-domain nodes solved with direct solver


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DDM Setup Interface • Tools -> Options -> General Options -> Analysis Option • Tools -> Options -> HFSS Option -> Solver • HFSS -> Analysis Setup -> Add Solution -> Setup Options

Master node Domain nodes


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Observing a DDM solution 1. Six sub-domains solving a. 7th master node or core at top 2. Four sub-domains finished, two running 3. Sub-domains finished; Master core iteratively reconstructing solution 4. Post-processing data 5. Transferring files


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Hardware Suggestions • Suggested: 4GB minimum per core • Master node: – Should have a “decent” amount of shared memory. – 4-16 for large problems – >16 for the largest (100+ cores)

– For very large simulations with many domain nodes the iterative process on the master node will be the most computationally expensive

• It is more important to use memory efficiently than to use all the processors. © 2009 ANSYS, Inc. All rights reserved.

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Example #1: F-35 - JSF

•F-35 Joint Strike Fighter: UHF blade antenna @ 350 MHz •Problem size = 1400λ3


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Results and Accuracy • Consistent results between domain decomposition and direct solver


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Faster Solutions • Solution time Number of Domains

Time (secs)

Speedup

1

23252

1.00

2

8928

2.60

3

6056

3.84

4

4479

5.19

5

3476

6.69

6

2784

8.35

7

2649

8.78

8

2180

10.67

9

2032

11.44

10

1760

13.21

11

1859

12.51

12

1804

12.89

13

1527

15.23

14

1649

14.10

15

1313

17.71

Iterative 1

4815

4.83

Time (secs) 25000

20000

15000 Time (secs) 10000

5000

0 1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Speed-up 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Speed-up

1


2

3

4

44

5

6

7

8

9

10

11

12

13

14

15


Memory Savings Number of Domains

total memory

average memory

total memory

1

33.30

33.30

2

28.43

14.22

3

27.46

9.15

4

24.89

6.22

5

24.88

4.98

6

23.94

3.99

7

23.53

3.36

8

23.25

2.91

9

22.15

2.46

10

21.06

2.11

11

21.97

2.00

12

20.64

1.72

13

20.96

1.61

14

20.49

1.46

15

20.18

1.35


35.00 30.00 25.00 20.00 total memory 15.00 10.00 5.00 0.00 0

2

4

45

6

8

10

12

14

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Example #2: Asymmetric Dish Antenna Total cores 8 12 16 20 24 28 32 36 40

Elapsed Time (S) 22049 12948 9540 7345 5649 4829 4560 4102 3912

Memory (GB) 153.7 133.5 123.6 114.6 110 107.7 103.7 101.2 96.4

Speed-up 1.00 1.70 2.31 3.00 3.90 4.57 4.84 5.38 5.64

Linear 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00

9-16 saves 12509 s =(22049-9540) 17-24 saves 3891 s Diminishing absolute returns

~17,500 λ3 Not an image of actually model simulated © 2009 ANSYS, Inc. All rights reserved.

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Example #2: Summary • Exhibits better than linear speed-up wrt number of cores – 8 to 32 = 4.8X speed-up.

• 67% memory savings from 8 to 40 cores • How does it compare to a single processor direct solve? – Answer: Could not be accomplished on a single machine. “Solving the previously unsolvable.”


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Remote Simulation Manager • New for Distributed Analysis and Remote Simulations – Easy to setup and use

• Enables DDM, DSO and remote solve capabilities – Supports mixed operating system environments – Supports LSF and Windows HPC


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Platform Support • Windows (32/64) – – – –

XP Professional Vista HPC Server 2008 Server 2003

• Linux – Red Hat Enterprise 4/5 – Suse v10 and v11


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Summary Graphical GraphicalUser UserInterface Interface Near Nearand andFar FarField FieldOverlay Overlay Adjoint Derivatives Adjoint Derivatives Imprint Imprintand andSelect Selectby byArea Area Clip Plane and Polyline cross Clip Plane and Polyline crosssection section

Mesh Mesh

Solver Solver

64-bit 64-bitVolumetric VolumetricMesh Mesh Curvilinear elements Curvilinear elements Initial InitialMesh MeshSettings Settings Increased IncreasedSpeed Speed

Mixed MixedElement ElementOrder Order Domain Decomposition Domain DecompositionMethod Method Dependent Solve Dependent Solve Port PortSolver Solverwith withDC DCExtrapolation Extrapolation Remote RemoteSolver SolverManager Manager


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HFSS 12.0 Tips and Techniques for HFSS Project Setup and Solve

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