Introducing HFSS Version 12 - Ansys
Introducing HFSS Version 12 - Ansys
Introducing HFSS Version 12 - Ansys
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<strong>Introducing</strong> <strong>HFSS</strong><br />
<strong>Version</strong> <strong>12</strong><br />
Matthew H. Commens,<br />
Ph.D.<br />
Product Manager<br />
Ansoft <strong>HFSS</strong><br />
© 2008 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary
<strong>HFSS</strong> <strong>12</strong>.0<br />
…high-performance …achieve …ANSYS “<strong>HFSS</strong> <strong>12</strong>.0 is a follows a breakthrough dramatic through computing reduction in high-frequency on its enhancement,<br />
in commitment development<br />
electromagnetic to field<br />
domain time deliver first time, and engineers technology decomposition…simulate costs are while able with to at solve the unequalled vast same electromagnetic time and depth realizing design and field at a<br />
scale increased unparalleled problems and with speed reliability speed, breadth… efficiency never and… and before accuracy. possible. “<br />
simulation,” said Zol Cendes, chief technology officer at Ansoft. “For the<br />
© 2008 ANSYS, Inc. All rights reserved. 2 ANSYS, Inc. Proprietary
<strong>HFSS</strong> <strong>12</strong>: New Features<br />
Integration with ANSYS<br />
DesignXplorer<br />
Adjoint Method Based Derivatives<br />
New Solver Technology<br />
Improved GUI and Modeler<br />
New Meshing<br />
Technology<br />
New Element<br />
Technologies<br />
© 2008 ANSYS, Inc. All rights reserved. 3 ANSYS, Inc. Proprietary
New Solver Technology<br />
Domain Decomposition<br />
© 2008 ANSYS, Inc. All rights reserved. 4 ANSYS, Inc. Proprietary
Simulating Large<br />
•F-35 Joint Strike Fighter: UHF blade antenna @ 350 MHz<br />
•L = 18.6λ, V = 806λ 3<br />
© 2008 ANSYS, Inc. All rights reserved. 5 ANSYS, Inc. Proprietary
“Divide and Conquer”<br />
© 2008 ANSYS, Inc. All rights reserved. 6 ANSYS, Inc. Proprietary
Domain Decomposition<br />
• Distributed memory parallel<br />
solver technique<br />
• Distributes mesh subdomains<br />
to network of<br />
processors<br />
• Significantly increases<br />
simulation capacity<br />
• Highly scalable to large<br />
numbers of processors<br />
• Automatic generation of<br />
domains by mesh partitioning<br />
– User friendly<br />
– Load balance<br />
• Hybrid iterative & direct solver<br />
– Multi-frontal direct solver for<br />
each sub-domain<br />
– Sub-domains exchange<br />
information iteratively via<br />
Robin’s transmission<br />
conditions (RTC)<br />
Distributes mesh sub-domains<br />
to networked processors and memory<br />
© 2008 ANSYS, Inc. All rights reserved. 7 ANSYS, Inc. Proprietary
18X Speed-up with 15 Domains<br />
Number of<br />
domains Time (sec) Speed-up<br />
1 23252 1.00<br />
2 8928 2.60<br />
3 6056 3.84<br />
4 4479 5.19<br />
5 3476 6.69<br />
6 2784 8.35<br />
7 2649 8.78<br />
8 2180 10.67<br />
9 2032 11.44<br />
10 1760 13.21<br />
11 1859 <strong>12</strong>.51<br />
<strong>12</strong> 1804 <strong>12</strong>.89<br />
13 1527 15.23<br />
14 1649 14.10<br />
15 1313 17.71<br />
18<br />
17<br />
16<br />
15<br />
14<br />
13<br />
<strong>12</strong><br />
11<br />
10<br />
9<br />
8<br />
7<br />
6<br />
5<br />
4<br />
3<br />
2<br />
1<br />
25000<br />
20000<br />
15000<br />
10000<br />
5000<br />
0<br />
Speed-up<br />
Superlinear performance!<br />
1 2 3 4 5 6 7 8 9 10 11 <strong>12</strong> 13 14 15<br />
Time (secs)<br />
1 2 3 4 5 6 7 8 9 10 11 <strong>12</strong> 13 14 15<br />
Speed-up<br />
Time (secs)<br />
© 2008 ANSYS, Inc. All rights reserved. 8 ANSYS, Inc. Proprietary
Results and Accuracy<br />
• Consistent results between domain<br />
decomposition and direct solver<br />
© 2008 ANSYS, Inc. All rights reserved. 9 ANSYS, Inc. Proprietary
Humvee with Patch Antennas<br />
• Two L-band patch antennas<br />
located on roof of Humvee<br />
– Fed using TM20 mode to excite<br />
monopole far-field pattern<br />
• Bounding airbox is <strong>12</strong>.5λ x 22λ x<br />
8λ or 2200λ3 6 domains Domain Solver<br />
Total Memory 4.5 GB<br />
Average Memory 0.75 GB<br />
Solution Time 25 min<br />
1 st order basis functions. Performed<br />
8 passes to reach ΔS = 0.02<br />
© 2008 ANSYS, Inc. All rights reserved. 10 ANSYS, Inc. Proprietary
WLAN Access Point and Printer<br />
• Wireless printer and router in typical office<br />
environment<br />
– 2.44 GHz solution frequency<br />
• Room size is 25λ x 25λ x 22λ or 13750λ 3<br />
• Solved on 16 core AMD Opteron<br />
workstation<br />
• Printer-to-router coupling: -57 dB<br />
15 domains Domain Solver<br />
Tetrahedra 846k<br />
Total Memory 32 GB<br />
Average Memory 2.0 GB<br />
Solution Time 5 hr 20 min<br />
© 2008 ANSYS, Inc. All rights reserved. 11 ANSYS, Inc. Proprietary
Metallic Sphere<br />
• Mie scattering from a PEC Sphere<br />
– 100λ in diameter<br />
– Distributed to 30 cores across four<br />
networked computers<br />
• Re-calibrate your Expectation!<br />
9M tetrahedra, 64-bit<br />
meshing<br />
51M unknowns (matrix size)<br />
© 2008 ANSYS, Inc. All rights reserved. <strong>12</strong> ANSYS, Inc. Proprietary
Domain Decomposition Example<br />
Antenna Integration on Spacecraft<br />
© 2008 ANSYS, Inc. All rights reserved. 13 ANSYS, Inc. Proprietary
Antenna Element Design<br />
• Operating criteria<br />
– 3-4 GHz frequency band<br />
– 50 Ω input impedance<br />
• Axial mode helix selected as antenna<br />
– Endfire radiation with moderate gain<br />
– Right-hand circular polarization<br />
– Wide bandwidth<br />
– Simple feed<br />
– High radiation efficiency<br />
• Orthogonal support dielectric along helix<br />
• Coax probe feed extends above antenna<br />
ground plane<br />
• Simulation with direct solver<br />
– 200k unknowns in 1.2 GB<br />
© 2008 ANSYS, Inc. All rights reserved. 14 ANSYS, Inc. Proprietary
Finite Array Model<br />
• 7-element array model with<br />
finite ground plane<br />
– Includes edge effects<br />
– Includes mutual coupling<br />
between elements<br />
Far-field Pattern for<br />
Broadside Beam<br />
Fields with All Element Excited<br />
Far-field Pattern for<br />
Broadside Beam<br />
© 2008 ANSYS, Inc. All rights reserved. 15 ANSYS, Inc. Proprietary
Installed Array on Spacecraft<br />
• Good correlation with<br />
isolated array patterns<br />
• L = 78 λ, V = 31,000 λ3 – 25M unknowns<br />
– <strong>12</strong> hr runtime, 35 cores<br />
• Recalibrate your expectations!<br />
© 2008 ANSYS, Inc. All rights reserved. 16 ANSYS, Inc. Proprietary
New Meshing Technology<br />
© 2008 ANSYS, Inc. All rights reserved. 17 ANSYS, Inc. Proprietary
New Meshing Technology<br />
Surface Mesh<br />
Volume Mesh<br />
<strong>HFSS</strong> 11<br />
(bottom up algorithm)<br />
model<br />
Geometric healing or repair<br />
(For model defects)<br />
Surface mesh generation<br />
Volume mesh generation<br />
Volume Mesh<br />
Surface Mesh<br />
<strong>HFSS</strong> <strong>12</strong><br />
(top down algorithm)<br />
model<br />
Volume mesh generation<br />
Adapt mesh to conform to geometry<br />
Conformal surface mesh generation<br />
© 2008 ANSYS, Inc. All rights reserved. 18 ANSYS, Inc. Proprietary
TAU Mesher<br />
• Mesh a higher percentage<br />
• Effective on imported geometries<br />
• Higher mesh quality<br />
• fewer total elements<br />
• smoother element transition<br />
• Automatically healing and repair.<br />
© 2008 ANSYS, Inc. All rights reserved. 19 ANSYS, Inc. Proprietary<br />
v11<br />
v<strong>12</strong>
Molex Backplane Connector<br />
•11.0 Initial Mesh: 631862<br />
•<strong>12</strong>.0 initial Mesh: 227517, ~63% reduction in initial mesh size<br />
•Mesh reduction directly translates to reduction in memory and solution time<br />
Fewer, higher quality mesh elements<br />
© 2008 ANSYS, Inc. All rights reserved. 20 ANSYS, Inc. Proprietary
New Element Technology<br />
Curvilinear Elements<br />
© 2008 ANSYS, Inc. All rights reserved. 21 ANSYS, Inc. Proprietary
Curvilinear Elements<br />
• Most accurate solution to fields on<br />
curved structures<br />
• Mesh adapted about curved or<br />
true surfaces<br />
• Element matrices computed using<br />
the curved boundaries<br />
• Reduces solution time and RAM<br />
usage<br />
– A smaller, coarser mesh<br />
achieves equivalent accuracy<br />
Rectilinear mesh element Curvilinear mesh element<br />
10 cm radius PEC sphere<br />
solved from 0.040 - 2 GHz<br />
Red – <strong>HFSS</strong><br />
Blue – Analytic Curve<br />
© 2008 ANSYS, Inc. All rights reserved. 22 ANSYS, Inc. Proprietary
SLAC Beam Former<br />
Ansoft LLC XY Plot 4<br />
truesurfaces_longer<br />
0<br />
Return Loss TM01 mode (dB)<br />
-5<br />
-10<br />
-15<br />
-20<br />
-25<br />
-30<br />
-35<br />
E-field along Z<br />
Measurements<br />
11,428.4 +- 0.5 MHz<br />
-40<br />
11426.0 11426.5 11427.0 11427.5 11428.0<br />
Freq [MHz]<br />
11428.5 11429.0 11429.5 11430.0<br />
© 2008 ANSYS, Inc. All rights reserved. 23 ANSYS, Inc. Proprietary<br />
Curve Info<br />
dB(S(WavePort1:3,WavePort1:3))<br />
Setup1 : Sw eep1<br />
SA='22.5deg'
Resonator with Concentric<br />
Spherical Dielectrics<br />
• Fewer curvilinear elements yield<br />
same accuracy as rectilinear<br />
– 88% fewer tetrahedra<br />
– Runs 16X faster<br />
I Wolff, “A generalized description of the spherical<br />
three-layer resonator with an anisotropic dielectric<br />
material,” IEEE AP Symp, June 1987, pp. 307-<br />
310<br />
Faceting f (GHz)<br />
45˚ 8.75<br />
30˚ 8.54<br />
15˚ 8.53<br />
10˚ 8.40<br />
7.5˚ 8.40<br />
5˚ 8.39<br />
22.5˚ 8.38<br />
ΔF=0.1% Mesh Time<br />
10˚ rect. 53k 16:40<br />
© 2008 ANSYS, Inc. All rights reserved. 24 ANSYS, Inc. Proprietary<br />
22.5°<br />
curv.<br />
6k 00:55
New Element Technology<br />
Mixed Element Orders<br />
© 2008 ANSYS, Inc. All rights reserved. 25 ANSYS, Inc. Proprietary
Mixed Element Orders<br />
• Automatic localization of basis<br />
functions<br />
• Refinement via element size and<br />
order<br />
• Locally efficient use of computing<br />
resources<br />
First-Order, 16:23, 1.40GB<br />
Mixed-Order, 7:55, 0.985GB<br />
© 2008 ANSYS, Inc. All rights reserved. 26 ANSYS, Inc. Proprietary
Log Periodic over EBG<br />
Groundplane<br />
• High geometric detail with large<br />
homogeneous radiation volume<br />
• Compare mixed order vs. 1 st<br />
order<br />
– 28% reduction in solution time<br />
– 29% reduction in memory<br />
• Mixed order converges faster<br />
– <strong>12</strong> passes vs. 14 passes<br />
– Average order = 0.96<br />
• S11 @ <strong>12</strong> GHz<br />
– 1 st S11 = 0.86584<br />
– Mixed S11 = 0.86511<br />
© 2008 ANSYS, Inc. All rights reserved. 27 ANSYS, Inc. Proprietary
<strong>Introducing</strong> Adjoint Method<br />
Based Deriviatives<br />
© 2008 ANSYS, Inc. All rights reserved. 28 ANSYS, Inc. Proprietary
Adjoint Derivatives<br />
• New Capability for sensitivity, tuning, and optimization<br />
• Compute the derivatives of SYZ parameters with respect to project and<br />
design variables<br />
• Eliminates need to solve multiple variations with small differences and<br />
numerical noise<br />
– More efficient and more accurate<br />
• Provides real-time tuning of reports to explore effects of small design changes<br />
• Improves derivative-based optimization methods<br />
2008 IEEE MTT-S Digest, pp. 527-530<br />
© 2008 ANSYS, Inc. All rights reserved. 29 ANSYS, Inc. Proprietary
Sensitivity of |S11|, Combline Filter<br />
Ri<br />
G2<br />
G1 G2<br />
G1 – gap between center<br />
tuner and resonator<br />
G2 – gap between off-center<br />
tuners and resonators<br />
Ri<br />
Ri – inner radius of coax feed<br />
Note: for sensitivity with respect<br />
to Ri, ports are involved<br />
dS11 dp [ 1/m ]<br />
10000<br />
5000<br />
0<br />
-5000<br />
-10000<br />
-15000<br />
9<br />
9.15 9.3<br />
9.459.6<br />
© 2008 ANSYS, Inc. All rights reserved. 30 ANSYS, Inc. Proprietary<br />
9.759.9<br />
10.05<br />
freq [GHz]<br />
10.2<br />
10.35<br />
10.5<br />
10.65<br />
10.8<br />
10.95<br />
0<br />
-10<br />
-20<br />
-30<br />
-40<br />
-50<br />
-60<br />
| S11| [ dB]<br />
This filter design is:<br />
- Most sensitive to change in gap G2<br />
- Least sensitive to change in coax radius Ri<br />
d|S11|_dRi<br />
d|S11|_dG1<br />
d|S11|_dG2<br />
|S11|
Local Derivatives Speed-up<br />
Optimization<br />
• Goal: Minimize reflection in<br />
waveguide quarter wave<br />
transformer<br />
• SNLP optimizer uses derivative<br />
information to speed-up<br />
calculation of response surface<br />
Example Optimization without Derivatives<br />
Example Optimization with Derivatives<br />
© 2008 ANSYS, Inc. All rights reserved. 31 ANSYS, Inc. Proprietary
SMA launch<br />
• SMA launch is typical multi-variable design problem<br />
• Design variables:<br />
– length, radius of via stub, radius of antipads, radius<br />
of signal pads, radius & antipad of ground via<br />
• Solve for the derivatives of many variables at once<br />
Nominal Values for<br />
Design Variables<br />
Specify Desired Derivatives<br />
in Solution Setup<br />
© 2008 ANSYS, Inc. All rights reserved. 32 ANSYS, Inc. Proprietary
Real-Time Tuning with Analytical<br />
Derivatives<br />
• Real-time tuning shows effects of<br />
small changes on S-parameters<br />
New Derivative<br />
Context in<br />
Report Editor<br />
S-parameters of Nominal Design<br />
© 2008 ANSYS, Inc. All rights reserved. 33 ANSYS, Inc. Proprietary<br />
S 11<br />
S 21<br />
Quickly Explore Effects of Small<br />
Changes on S-parameters
Improved GUI and Modeler<br />
© 2008 ANSYS, Inc. All rights reserved. 34 ANSYS, Inc. Proprietary
Post-Processing Variables<br />
• New type of variable whose value<br />
can be modified without resimulating<br />
model<br />
• Optimize complex weights of<br />
antenna elements in phased array<br />
– Optimize for side-lobe location<br />
and main beam peak<br />
Optimization of Phased Array Excitations<br />
Synthesized Far-field Pattern<br />
© 2008 ANSYS, Inc. All rights reserved. 35 ANSYS, Inc. Proprietary
Convergence Based on Multiple<br />
Output Variables<br />
• Evaluate and save multiple<br />
expressions vs. adaptive pass<br />
– Includes SYZ parameters,<br />
local, near and far field<br />
– Fully integrated with reporter<br />
and Optimetrics<br />
© 2008 ANSYS, Inc. All rights reserved. 36 ANSYS, Inc. Proprietary
Clip Plane Viewing<br />
• Project preview<br />
– Image and notes<br />
available in File Open<br />
– Image available in<br />
Windows Explorer<br />
• Clip plane<br />
– Interactively slice<br />
through arbitrary plane<br />
– Can view model<br />
geometry, mesh plots,<br />
field plots, etc.<br />
© 2008 ANSYS, Inc. All rights reserved. 37 ANSYS, Inc. Proprietary
Select by Area Mode<br />
• Enable material override<br />
– Conductors override<br />
dielectrics<br />
– Smaller objects override<br />
larger objects with same<br />
material<br />
– Avoids need for explicit<br />
subtractions<br />
• Select objects by area<br />
– Click and drag to rubber-band<br />
select<br />
– Right-to-left selects all objects<br />
passing through window<br />
– Left-to-right selects all objects<br />
inside window<br />
© 2008 ANSYS, Inc. All rights reserved. 38 ANSYS, Inc. Proprietary
Overlay Far Field Plots on Model<br />
• Visualize radiation patterns on model geometry<br />
– Control transparency and/or size of pattern overlay<br />
© 2008 ANSYS, Inc. All rights reserved. 39 ANSYS, Inc. Proprietary
Array Variables<br />
Assign array<br />
variable to<br />
Material property<br />
Supported at<br />
design level only<br />
© 2008 ANSYS, Inc. All rights reserved. 40 ANSYS, Inc. Proprietary
New Modeling Commmands<br />
• Fillets and<br />
Chamfers on<br />
2D objects<br />
• Sheet wrapping<br />
• Sheet and body<br />
imprinting with<br />
projection<br />
“Modeler/Chamfer (Fillet)”<br />
© 2008 ANSYS, Inc. All rights reserved. 41 ANSYS, Inc. Proprietary
Streamline plots<br />
Streamline plot of Poynting vector<br />
on this face. Streamlines originate at<br />
discrete points on the face<br />
© 2008 ANSYS, Inc. All rights reserved. 42 ANSYS, Inc. Proprietary
Integration with ANSYS<br />
DesignXplorer<br />
© 2008 ANSYS, Inc. All rights reserved. 43 ANSYS, Inc. Proprietary
ANSYS DesignXplorer in R<strong>12</strong>.1<br />
and <strong>HFSS</strong> <strong>12</strong>.0<br />
WR90 Transition<br />
© 2008 ANSYS, Inc. All rights reserved. 44 ANSYS, Inc. Proprietary<br />
height<br />
length<br />
width<br />
WR137
DX – Response Surface<br />
© 2008 ANSYS, Inc. All rights reserved. 45 ANSYS, Inc. Proprietary
DX – Robust Design (DOE)<br />
© 2008 ANSYS, Inc. All rights reserved. 46 ANSYS, Inc. Proprietary
Six Sigma<br />
© 2008 ANSYS, Inc. All rights reserved. 47 ANSYS, Inc. Proprietary
Port post-processing on fields<br />
Matched terminal s-parameters<br />
<strong>HFSS</strong> <strong>12</strong>.0: Available Now!<br />
Modeler selection by area filter<br />
Fixed distance padding for region<br />
User Defined Keyboard shortcuts<br />
Expression cache<br />
Multiple output variable convergence<br />
Overlap/intersecting object selection from message<br />
window<br />
ACIS R19 SP2 upgrade<br />
Extended healing capability<br />
Improved setup for analytic ports<br />
Project specific script recording<br />
Define parametric sweep from file<br />
Improved far field data link. More efficient<br />
Project Preview – Both file open and in Windows Explorer<br />
Flexible history editing<br />
Polyline cross-section<br />
Mode filtering for report setup<br />
© 2008 ANSYS, Inc. All rights reserved. 48 ANSYS, Inc. Proprietary